2023-09-04 14:07:24 +00:00
# 10.1.1 - 2023-08-28
- Added formatters for `std::atomic` and `atomic_flag`
([#3574](https://github.com/fmtlib/fmt/pull/3574),
[#3594 ](https://github.com/fmtlib/fmt/pull/3594 )). Thanks [\@wangzw
(Zhanwei Wang)](https://github.com/wangzw) and [\@AlexGuteniev (Alex
Guteniev)](https://github.com/AlexGuteniev).
- Fixed an error about partial specialization of `formatter<string>`
after instantiation when compiled with gcc and C++20
([#3584](https://github.com/fmtlib/fmt/issues/3584)).
- Fixed compilation as a C++20 module with gcc and clang
([#3587](https://github.com/fmtlib/fmt/issues/3587),
[#3597 ](https://github.com/fmtlib/fmt/pull/3597 ),
[#3605 ](https://github.com/fmtlib/fmt/pull/3605 )). Thanks
[\@MathewBensonCode (Mathew
Benson)](https://github.com/MathewBensonCode).
- Made `fmt::to_string` work with types that have `format_as`
overloads ([#3575](https://github.com/fmtlib/fmt/pull/3575)). Thanks
[\@phprus (Vladislav Shchapov) ](https://github.com/phprus ).
- Made `formatted_size` work with integral format specifiers at
compile time ([#3591](https://github.com/fmtlib/fmt/pull/3591)).
Thanks [\@elbeno (Ben Deane) ](https://github.com/elbeno ).
- Fixed a warning about the `no_unique_address` attribute on clang-cl
([#3599](https://github.com/fmtlib/fmt/pull/3599)). Thanks
[\@lukester1975 ](https://github.com/lukester1975 ).
- Improved compatibility with the legacy GBK encoding
([#3598](https://github.com/fmtlib/fmt/issues/3598),
[#3599 ](https://github.com/fmtlib/fmt/pull/3599 )). Thanks
[\@YuHuanTin ](https://github.com/YuHuanTin ).
- Added OpenSSF Scorecard analysis
([#3530](https://github.com/fmtlib/fmt/issues/3530),
[#3571 ](https://github.com/fmtlib/fmt/pull/3571 )). Thanks
[\@joycebrum (Joyce) ](https://github.com/joycebrum ).
- Updated CI dependencies
([#3591](https://github.com/fmtlib/fmt/pull/3591),
[#3592 ](https://github.com/fmtlib/fmt/pull/3592 ),
[#3593 ](https://github.com/fmtlib/fmt/pull/3593 ),
[#3602 ](https://github.com/fmtlib/fmt/pull/3602 )).
# 10.1.0 - 2023-08-12
- Optimized format string compilation resulting in up to 40% speed up
in compiled `format_to` and \~4x speed up in compiled `format_to_n`
on a concatenation benchmark
([#3133](https://github.com/fmtlib/fmt/issues/3133),
[#3484 ](https://github.com/fmtlib/fmt/issues/3484 )).
{fmt} 10.0:
---------------------------------------------------------
Benchmark Time CPU Iterations
---------------------------------------------------------
BM_format_to 78.9 ns 78.9 ns 8881746
BM_format_to_n 568 ns 568 ns 1232089
{fmt} 10.1:
---------------------------------------------------------
Benchmark Time CPU Iterations
---------------------------------------------------------
BM_format_to 54.9 ns 54.9 ns 12727944
BM_format_to_n 133 ns 133 ns 5257795
- Optimized storage of an empty allocator in `basic_memory_buffer`
([#3485](https://github.com/fmtlib/fmt/pull/3485)). Thanks
[\@Minty-Meeo ](https://github.com/Minty-Meeo ).
- Added formatters for proxy references to elements of
`std::vector<bool>` and `std::bitset<N>`
([#3567](https://github.com/fmtlib/fmt/issues/3567),
[#3570 ](https://github.com/fmtlib/fmt/pull/3570 )). For example
([godbolt](https://godbolt.org/z/zYb79Pvn8)):
```c++
#include < vector >
#include < fmt / std . h >
int main() {
auto v = std::vector< bool > {true};
fmt::print("{}", v[0]);
}
```
Thanks [\@phprus (Vladislav Shchapov) ](https://github.com/phprus )
and [\@felix642 (Félix-Antoine
Constantin)](https://github.com/felix642).
- Fixed an ambiguous formatter specialization for containers that look
like container adaptors such as `boost::flat_set`
([#3556](https://github.com/fmtlib/fmt/issues/3556),
[#3561 ](https://github.com/fmtlib/fmt/pull/3561 )). Thanks
[\@5chmidti ](https://github.com/5chmidti ).
- Fixed compilation when formatting durations not convertible from
`std::chrono::seconds`
([#3430](https://github.com/fmtlib/fmt/pull/3430)). Thanks
[\@patlkli (Patrick Geltinger) ](https://github.com/patlkli ).
- Made the `formatter` specialization for `char*` const-correct
([#3432](https://github.com/fmtlib/fmt/pull/3432)). Thanks
[\@timsong-cpp ](https://github.com/timsong-cpp ).
- Made `{}` and `{:}` handled consistently during compile-time checks
([#3526](https://github.com/fmtlib/fmt/issues/3526)).
- Disallowed passing temporaries to `make_format_args` to improve API
safety by preventing dangling references.
- Improved the compile-time error for unformattable types
([#3478](https://github.com/fmtlib/fmt/pull/3478)). Thanks
[\@BRevzin (Barry Revzin) ](https://github.com/BRevzin ).
- Improved the floating-point formatter
([#3448](https://github.com/fmtlib/fmt/pull/3448),
[#3450 ](https://github.com/fmtlib/fmt/pull/3450 )). Thanks
[\@florimond-collette (Florimond
Collette)](https://github.com/florimond-collette).
- Fixed handling of precision for `long double` larger than 64 bits.
([#3539](https://github.com/fmtlib/fmt/issues/3539),
[#3564 ](https://github.com/fmtlib/fmt/issues/3564 )).
- Made floating-point and chrono tests less platform-dependent
([#3337](https://github.com/fmtlib/fmt/issues/3337),
[#3433 ](https://github.com/fmtlib/fmt/issues/3433 ),
[#3434 ](https://github.com/fmtlib/fmt/pull/3434 )). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Removed the remnants of the Grisu floating-point formatter that has
been replaced by Dragonbox in earlier versions.
- Added `throw_format_error` to the public API
([#3551](https://github.com/fmtlib/fmt/pull/3551)). Thanks
[\@mjerabek (Martin Jeřábek) ](https://github.com/mjerabek ).
- Made `FMT_THROW` assert even if assertions are disabled when
compiling with exceptions disabled
([#3418](https://github.com/fmtlib/fmt/issues/3418),
[#3439 ](https://github.com/fmtlib/fmt/pull/3439 )). Thanks [\@BRevzin
(Barry Revzin)](https://github.com/BRevzin).
- Made `format_as` and `std::filesystem::path` formatter work with
exotic code unit types.
([#3457](https://github.com/fmtlib/fmt/pull/3457),
[#3476 ](https://github.com/fmtlib/fmt/pull/3476 )). Thanks [\@gix
(Nico Rieck)](https://github.com/gix), [\@hmbj (Hans-Martin B.
Jensen)](https://github.com/hmbj).
- Added support for the `?` format specifier to
`std::filesystem::path` and made the default unescaped for
consistency with strings.
- Deprecated the wide stream overload of `printf` .
- Removed unused `basic_printf_parse_context` .
- Improved RTTI detection used when formatting exceptions
([#3468](https://github.com/fmtlib/fmt/pull/3468)). Thanks [\@danakj
(Dana Jansens)](https://github.com/danakj).
- Improved compatibility with VxWorks7
([#3467](https://github.com/fmtlib/fmt/pull/3467)). Thanks
[\@wenshan1 (Bin Lan) ](https://github.com/wenshan1 ).
- Improved documentation
([#3174](https://github.com/fmtlib/fmt/issues/3174),
[#3423 ](https://github.com/fmtlib/fmt/issues/3423 ),
[#3454 ](https://github.com/fmtlib/fmt/pull/3454 ),
[#3458 ](https://github.com/fmtlib/fmt/issues/3458 ),
[#3461 ](https://github.com/fmtlib/fmt/pull/3461 ),
[#3487 ](https://github.com/fmtlib/fmt/issues/3487 ),
[#3515 ](https://github.com/fmtlib/fmt/pull/3515 )). Thanks
[\@zencatalyst (Kasra Hashemi) ](https://github.com/zencatalyst ),
[\@rlalik ](https://github.com/rlalik ), [\@mikecrowe (Mike
Crowe)](https://github.com/mikecrowe).
- Improved build and CI configurations
([#3449](https://github.com/fmtlib/fmt/issues/3449),
[#3451 ](https://github.com/fmtlib/fmt/pull/3451 ),
[#3452 ](https://github.com/fmtlib/fmt/pull/3452 ),
[#3453 ](https://github.com/fmtlib/fmt/pull/3453 ),
[#3459 ](https://github.com/fmtlib/fmt/pull/3459 ),
[#3481 ](https://github.com/fmtlib/fmt/issues/3481 ),
[#3486 ](https://github.com/fmtlib/fmt/pull/3486 ),
[#3489 ](https://github.com/fmtlib/fmt/issues/3489 ),
[#3496 ](https://github.com/fmtlib/fmt/pull/3496 ),
[#3517 ](https://github.com/fmtlib/fmt/issues/3517 ),
[#3523 ](https://github.com/fmtlib/fmt/pull/3523 ),
[#3563 ](https://github.com/fmtlib/fmt/pull/3563 )). Thanks
[\@joycebrum (Joyce) ](https://github.com/joycebrum ), [\@glebm (Gleb
Mazovetskiy)](https://github.com/glebm), [\@phprus (Vladislav
Shchapov)](https://github.com/phprus), [\@petrmanek (Petr
Mánek)](https://github.com/petrmanek), [\@setoye
(Alta)](https://github.com/setoye), [\@abouvier (Alexandre
Bouvier)](https://github.com/abouvier).
- Fixed various warnings and compilation issues
([#3408](https://github.com/fmtlib/fmt/issues/3408),
[#3424 ](https://github.com/fmtlib/fmt/issues/3424 ),
[#3444 ](https://github.com/fmtlib/fmt/issues/3444 ),
[#3446 ](https://github.com/fmtlib/fmt/pull/3446 ),
[#3475 ](https://github.com/fmtlib/fmt/pull/3475 ),
[#3482 ](https://github.com/fmtlib/fmt/pull/3482 ),
[#3492 ](https://github.com/fmtlib/fmt/issues/3492 ),
[#3493 ](https://github.com/fmtlib/fmt/pull/3493 ),
[#3508 ](https://github.com/fmtlib/fmt/pull/3508 ),
[#3509 ](https://github.com/fmtlib/fmt/issues/3509 ),
[#3533 ](https://github.com/fmtlib/fmt/issues/3533 ),
[#3542 ](https://github.com/fmtlib/fmt/pull/3542 ),
[#3543 ](https://github.com/fmtlib/fmt/issues/3543 ),
[#3540 ](https://github.com/fmtlib/fmt/issues/3540 ),
[#3544 ](https://github.com/fmtlib/fmt/pull/3544 ),
[#3548 ](https://github.com/fmtlib/fmt/issues/3548 ),
[#3549 ](https://github.com/fmtlib/fmt/pull/3549 ),
[#3550 ](https://github.com/fmtlib/fmt/pull/3550 ),
[#3552 ](https://github.com/fmtlib/fmt/pull/3552 )). Thanks
[\@adesitter (Arnaud Desitter) ](https://github.com/adesitter ),
[\@hmbj (Hans-Martin B. Jensen) ](https://github.com/hmbj ),
[\@Minty-Meeo ](https://github.com/Minty-Meeo ), [\@phprus (Vladislav
Shchapov)](https://github.com/phprus), [\@TobiSchluter (Tobias
Schlüter)](https://github.com/TobiSchluter), [\@kieranclancy (Kieran
Clancy)](https://github.com/kieranclancy), [\@alexeedm (Dmitry
Alexeev)](https://github.com/alexeedm), [\@jurihock (Jürgen
Hock)](https://github.com/jurihock),
[\@Ozomahtli ](https://github.com/Ozomahtli ),
[\@razaqq ](https://github.com/razaqq ).
# 10.0.0 - 2023-05-09
- Replaced Grisu with a new floating-point formatting algorithm for
given precision ([#3262](https://github.com/fmtlib/fmt/issues/3262),
[#2750 ](https://github.com/fmtlib/fmt/issues/2750 ),
[#3269 ](https://github.com/fmtlib/fmt/pull/3269 ),
[#3276 ](https://github.com/fmtlib/fmt/pull/3276 )). The new algorithm
is based on Dragonbox already used for the shortest representation
and gives substantial performance improvement:
2023-09-04 14:59:30 +00:00
2023-09-04 14:07:24 +00:00
- Red: new algorithm
- Green: new algorithm with `FMT_USE_FULL_CACHE_DRAGONBOX` defined
to 1
- Blue: old algorithm
Thanks [\@jk-jeon (Junekey Jeon) ](https://github.com/jk-jeon ).
- Replaced `snprintf` -based hex float formatter with an internal
implementation ([#3179](https://github.com/fmtlib/fmt/pull/3179),
[#3203 ](https://github.com/fmtlib/fmt/pull/3203 )). This removes the
last usage of `s(n)printf` in {fmt}. Thanks [\@phprus (Vladislav
Shchapov)](https://github.com/phprus).
- Fixed alignment of floating-point numbers with localization
([#3263](https://github.com/fmtlib/fmt/issues/3263),
[#3272 ](https://github.com/fmtlib/fmt/pull/3272 )). Thanks
[\@ShawnZhong (Shawn Zhong) ](https://github.com/ShawnZhong ).
- Made handling of `#` consistent with `std::format` .
- Improved C++20 module support
([#3134](https://github.com/fmtlib/fmt/pull/3134),
[#3254 ](https://github.com/fmtlib/fmt/pull/3254 ),
[#3386 ](https://github.com/fmtlib/fmt/pull/3386 ),
[#3387 ](https://github.com/fmtlib/fmt/pull/3387 ),
[#3388 ](https://github.com/fmtlib/fmt/pull/3388 ),
[#3392 ](https://github.com/fmtlib/fmt/pull/3392 ),
[#3397 ](https://github.com/fmtlib/fmt/pull/3397 ),
[#3399 ](https://github.com/fmtlib/fmt/pull/3399 ),
[#3400 ](https://github.com/fmtlib/fmt/pull/3400 )). Thanks
[\@laitingsheng (Tinson Lai) ](https://github.com/laitingsheng ),
[\@Orvid (Orvid King) ](https://github.com/Orvid ), [\@DanielaE
(Daniela Engert)](https://github.com/DanielaE). Switched to the
[modules CMake library ](https://github.com/vitaut/modules ) which
allows building {fmt} as a C++20 module with clang:
CXX=clang++ cmake -DFMT_MODULE=ON .
make
- Made `format_as` work with any user-defined type and not just enums.
For example ([godbolt](https://godbolt.org/z/b7rqhq5Kh)):
```c++
#include < fmt / format . h >
struct floaty_mc_floatface {
double value;
};
auto format_as(floaty_mc_floatface f) { return f.value; }
int main() {
fmt::print("{:8}\n", floaty_mc_floatface{0.42}); // prints " 0.42"
}
```
- Removed deprecated implicit conversions for enums and conversions to
primitive types for compatibility with `std::format` and to prevent
potential ODR violations. Use `format_as` instead.
- Added support for fill, align and width to the time point formatter
([#3237](https://github.com/fmtlib/fmt/issues/3237),
[#3260 ](https://github.com/fmtlib/fmt/pull/3260 ),
[#3275 ](https://github.com/fmtlib/fmt/pull/3275 )). For example
([godbolt](https://godbolt.org/z/rKP6MGz6c)):
```c++
#include < fmt / chrono . h >
int main() {
// prints " 2023"
fmt::print("{:>8%Y}\n", std::chrono::system_clock::now());
}
```
Thanks [\@ShawnZhong (Shawn Zhong) ](https://github.com/ShawnZhong ).
- Implemented formatting of subseconds
([#2207](https://github.com/fmtlib/fmt/issues/2207),
[#3117 ](https://github.com/fmtlib/fmt/issues/3117 ),
[#3115 ](https://github.com/fmtlib/fmt/pull/3115 ),
[#3143 ](https://github.com/fmtlib/fmt/pull/3143 ),
[#3144 ](https://github.com/fmtlib/fmt/pull/3144 ),
[#3349 ](https://github.com/fmtlib/fmt/pull/3349 )). For example
([godbolt](https://godbolt.org/z/45738oGEo)):
```c++
#include < fmt / chrono . h >
int main() {
// prints 01.234567
fmt::print("{:%S}\n", std::chrono::microseconds(1234567));
}
```
Thanks [\@patrickroocks (Patrick
Roocks)](https://github.com/patrickroocks) [\@phprus (Vladislav
Shchapov)](https://github.com/phprus), [\@BRevzin (Barry
Revzin)](https://github.com/BRevzin).
- Added precision support to `%S`
([#3148](https://github.com/fmtlib/fmt/pull/3148)). Thanks
[\@SappyJoy (Stepan Ponomaryov) ](https://github.com/SappyJoy )
- Added support for `std::utc_time`
([#3098](https://github.com/fmtlib/fmt/issues/3098),
[#3110 ](https://github.com/fmtlib/fmt/pull/3110 )). Thanks
[\@patrickroocks (Patrick
Roocks)](https://github.com/patrickroocks).
- Switched formatting of `std::chrono::system_clock` from local time
to UTC for compatibility with the standard
([#3199](https://github.com/fmtlib/fmt/issues/3199),
[#3230 ](https://github.com/fmtlib/fmt/pull/3230 )). Thanks [\@ned14
(Niall Douglas)](https://github.com/ned14).
- Added support for `%Ez` and `%Oz` to chrono formatters.
([#3220](https://github.com/fmtlib/fmt/issues/3220),
[#3222 ](https://github.com/fmtlib/fmt/pull/3222 )). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Improved validation of format specifiers for `std::chrono::duration`
([#3219](https://github.com/fmtlib/fmt/issues/3219),
[#3232 ](https://github.com/fmtlib/fmt/pull/3232 )). Thanks
[\@ShawnZhong (Shawn Zhong) ](https://github.com/ShawnZhong ).
- Fixed formatting of time points before the epoch
([#3117](https://github.com/fmtlib/fmt/issues/3117),
[#3261 ](https://github.com/fmtlib/fmt/pull/3261 )). For example
([godbolt](https://godbolt.org/z/f7bcznb3W)):
```c++
#include < fmt / chrono . h >
int main() {
auto t = std::chrono::system_clock::from_time_t(0) -
std::chrono::milliseconds(250);
fmt::print("{:%S}\n", t); // prints 59.750000000
}
```
Thanks [\@ShawnZhong (Shawn Zhong) ](https://github.com/ShawnZhong ).
- Experimental: implemented glibc extension for padding seconds,
minutes and hours
([#2959](https://github.com/fmtlib/fmt/issues/2959),
[#3271 ](https://github.com/fmtlib/fmt/pull/3271 )). Thanks
[\@ShawnZhong (Shawn Zhong) ](https://github.com/ShawnZhong ).
- Added a formatter for `std::exception`
([#2977](https://github.com/fmtlib/fmt/issues/2977),
[#3012 ](https://github.com/fmtlib/fmt/issues/3012 ),
[#3062 ](https://github.com/fmtlib/fmt/pull/3062 ),
[#3076 ](https://github.com/fmtlib/fmt/pull/3076 ),
[#3119 ](https://github.com/fmtlib/fmt/pull/3119 )). For example
([godbolt](https://godbolt.org/z/8xoWGs9e4)):
```c++
#include < fmt / std . h >
#include < vector >
int main() {
try {
std::vector< bool > ().at(0);
} catch(const std::exception& e) {
fmt::print("{}", e);
}
}
```
prints:
vector< bool > ::_M_range_check: __n (which is 0) >= this->size() (which is 0)
on libstdc++. Thanks [\@zach2good (Zach
Toogood)](https://github.com/zach2good) and [\@phprus (Vladislav
Shchapov)](https://github.com/phprus).
- Moved `std::error_code` formatter from `fmt/os.h` to `fmt/std.h` .
([#3125](https://github.com/fmtlib/fmt/pull/3125)). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Added formatters for standard container adapters:
`std::priority_queue` , `std::queue` and `std::stack`
([#3215](https://github.com/fmtlib/fmt/issues/3215),
[#3279 ](https://github.com/fmtlib/fmt/pull/3279 )). For example
([godbolt](https://godbolt.org/z/74h1xY9qK)):
```c++
#include < fmt / ranges . h >
#include < stack >
#include < vector >
int main() {
auto s = std::stack< bool , std::vector < bool > >();
for (auto b: {true, false, true}) s.push(b);
fmt::print("{}\n", s); // prints [true, false, true]
}
```
Thanks [\@ShawnZhong (Shawn Zhong) ](https://github.com/ShawnZhong ).
- Added a formatter for `std::optional` to `fmt/std.h` . Thanks
[\@tom-huntington ](https://github.com/tom-huntington ).
- Fixed formatting of valueless by exception variants
([#3347](https://github.com/fmtlib/fmt/pull/3347)). Thanks
[\@TheOmegaCarrot ](https://github.com/TheOmegaCarrot ).
- Made `fmt::ptr` accept `unique_ptr` with a custom deleter
([#3177](https://github.com/fmtlib/fmt/pull/3177)). Thanks [\@hmbj
(Hans-Martin B. Jensen)](https://github.com/hmbj).
- Fixed formatting of noncopyable ranges and nested ranges of chars
([#3158](https://github.com/fmtlib/fmt/pull/3158)
[#3286 ](https://github.com/fmtlib/fmt/issues/3286 ),
[#3290 ](https://github.com/fmtlib/fmt/pull/3290 )). Thanks [\@BRevzin
(Barry Revzin)](https://github.com/BRevzin).
- Fixed issues with formatting of paths and ranges of paths
([#3319](https://github.com/fmtlib/fmt/issues/3319),
[#3321 ](https://github.com/fmtlib/fmt/pull/3321 )
[#3322 ](https://github.com/fmtlib/fmt/issues/3322 )). Thanks
[\@phprus (Vladislav Shchapov) ](https://github.com/phprus ).
- Improved handling of invalid Unicode in paths.
- Enabled compile-time checks on Apple clang 14 and later
([#3331](https://github.com/fmtlib/fmt/pull/3331)). Thanks [\@cloyce
(Cloyce D. Spradling)](https://github.com/cloyce).
- Improved compile-time checks of named arguments
([#3105](https://github.com/fmtlib/fmt/issues/3105),
[#3214 ](https://github.com/fmtlib/fmt/pull/3214 )). Thanks [\@rbrich
(Radek Brich)](https://github.com/rbrich).
- Fixed formatting when both alignment and `0` are given
([#3236](https://github.com/fmtlib/fmt/issues/3236),
[#3248 ](https://github.com/fmtlib/fmt/pull/3248 )). Thanks
[\@ShawnZhong (Shawn Zhong) ](https://github.com/ShawnZhong ).
- Improved Unicode support in the experimental file API on Windows
([#3234](https://github.com/fmtlib/fmt/issues/3234),
[#3293 ](https://github.com/fmtlib/fmt/pull/3293 )). Thanks [\@Fros1er
(Froster)](https://github.com/Fros1er).
- Unified UTF transcoding
([#3416](https://github.com/fmtlib/fmt/pull/3416)). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Added support for UTF-8 digit separators via an experimental locale
facet ([#1861](https://github.com/fmtlib/fmt/issues/1861)). For
example ([godbolt](https://godbolt.org/z/f7bcznb3W)):
```c++
auto loc = std::locale(
std::locale(), new fmt::format_facet< std::locale > ("’
auto s = fmt::format(loc, "{:L}", 1000);
```
where `’ is U+2019 used as a digit separator in the de_CH locale.
- Added an overload of `formatted_size` that takes a locale
([#3084](https://github.com/fmtlib/fmt/issues/3084),
[#3087 ](https://github.com/fmtlib/fmt/pull/3087 )). Thanks
[\@gerboengels ](https://github.com/gerboengels ).
- Removed the deprecated `FMT_DEPRECATED_OSTREAM` .
- Fixed a UB when using a null `std::string_view` with
`fmt::to_string` or format string compilation
([#3241](https://github.com/fmtlib/fmt/issues/3241),
[#3244 ](https://github.com/fmtlib/fmt/pull/3244 )). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Added `starts_with` to the fallback `string_view` implementation
([#3080](https://github.com/fmtlib/fmt/pull/3080)). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Added `fmt::basic_format_string::get()` for compatibility with
`basic_format_string`
([#3111](https://github.com/fmtlib/fmt/pull/3111)). Thanks
[\@huangqinjin ](https://github.com/huangqinjin ).
- Added `println` for compatibility with C++23
([#3267](https://github.com/fmtlib/fmt/pull/3267)). Thanks
[\@ShawnZhong (Shawn Zhong) ](https://github.com/ShawnZhong ).
- Renamed the `FMT_EXPORT` macro for shared library usage to
`FMT_LIB_EXPORT` .
- Improved documentation
([#3108](https://github.com/fmtlib/fmt/issues/3108),
[#3169 ](https://github.com/fmtlib/fmt/issues/3169 ),
[#3243 ](https://github.com/fmtlib/fmt/pull/3243 )).
[#3404 ](https://github.com/fmtlib/fmt/pull/3404 )). Thanks
[\@Cleroth ](https://github.com/Cleroth ) and
[\@Vertexwahn ](https://github.com/Vertexwahn ).
- Improved build configuration and tests
([#3118](https://github.com/fmtlib/fmt/pull/3118),
[#3120 ](https://github.com/fmtlib/fmt/pull/3120 ),
[#3188 ](https://github.com/fmtlib/fmt/pull/3188 ),
[#3189 ](https://github.com/fmtlib/fmt/issues/3189 ),
[#3198 ](https://github.com/fmtlib/fmt/pull/3198 ),
[#3205 ](https://github.com/fmtlib/fmt/pull/3205 ),
[#3207 ](https://github.com/fmtlib/fmt/pull/3207 ),
[#3210 ](https://github.com/fmtlib/fmt/pull/3210 ),
[#3240 ](https://github.com/fmtlib/fmt/pull/3240 ),
[#3256 ](https://github.com/fmtlib/fmt/pull/3256 ),
[#3264 ](https://github.com/fmtlib/fmt/pull/3264 ),
[#3299 ](https://github.com/fmtlib/fmt/issues/3299 ),
[#3302 ](https://github.com/fmtlib/fmt/pull/3302 ),
[#3312 ](https://github.com/fmtlib/fmt/pull/3312 ),
[#3317 ](https://github.com/fmtlib/fmt/issues/3317 ),
[#3328 ](https://github.com/fmtlib/fmt/pull/3328 ),
[#3333 ](https://github.com/fmtlib/fmt/pull/3333 ),
[#3369 ](https://github.com/fmtlib/fmt/pull/3369 ),
[#3373 ](https://github.com/fmtlib/fmt/issues/3373 ),
[#3395 ](https://github.com/fmtlib/fmt/pull/3395 ),
[#3406 ](https://github.com/fmtlib/fmt/pull/3406 ),
[#3411 ](https://github.com/fmtlib/fmt/pull/3411 )). Thanks
[\@dimztimz (Dimitrij Mijoski) ](https://github.com/dimztimz ),
[\@phprus (Vladislav Shchapov) ](https://github.com/phprus ),
[\@DavidKorczynski ](https://github.com/DavidKorczynski ),
[\@ChrisThrasher (Chris
Thrasher)](https://github.com/ChrisThrasher), [\@FrancoisCarouge
(François Carouge)](https://github.com/FrancoisCarouge),
[\@kennyweiss (Kenny Weiss) ](https://github.com/kennyweiss ),
[\@luzpaz ](https://github.com/luzpaz ), [\@codeinred (Alecto Irene
Perez)](https://github.com/codeinred), [\@Mixaill (Mikhail
Paulyshka)](https://github.com/Mixaill), [\@joycebrum
(Joyce)](https://github.com/joycebrum), [\@kevinhwang (Kevin
Hwang)](https://github.com/kevinhwang),
[\@Vertexwahn ](https://github.com/Vertexwahn ).
- Fixed a regression in handling empty format specifiers after a colon
(`{:}`) ([#3086](https://github.com/fmtlib/fmt/pull/3086)). Thanks
[\@oxidase (Michael Krasnyk) ](https://github.com/oxidase ).
- Worked around a broken implementation of
`std::is_constant_evaluated` in some versions of libstdc++ on clang
([#3247](https://github.com/fmtlib/fmt/issues/3247),
[#3281 ](https://github.com/fmtlib/fmt/pull/3281 )). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Fixed formatting of volatile variables
([#3068](https://github.com/fmtlib/fmt/pull/3068)).
- Fixed various warnings and compilation issues
([#3057](https://github.com/fmtlib/fmt/pull/3057),
[#3066 ](https://github.com/fmtlib/fmt/pull/3066 ),
[#3072 ](https://github.com/fmtlib/fmt/pull/3072 ),
[#3082 ](https://github.com/fmtlib/fmt/pull/3082 ),
[#3091 ](https://github.com/fmtlib/fmt/pull/3091 ),
[#3092 ](https://github.com/fmtlib/fmt/issues/3092 ),
[#3093 ](https://github.com/fmtlib/fmt/pull/3093 ),
[#3095 ](https://github.com/fmtlib/fmt/pull/3095 ),
[#3096 ](https://github.com/fmtlib/fmt/issues/3096 ),
[#3097 ](https://github.com/fmtlib/fmt/pull/3097 ),
[#3128 ](https://github.com/fmtlib/fmt/issues/3128 ),
[#3129 ](https://github.com/fmtlib/fmt/pull/3129 ),
[#3137 ](https://github.com/fmtlib/fmt/pull/3137 ),
[#3139 ](https://github.com/fmtlib/fmt/pull/3139 ),
[#3140 ](https://github.com/fmtlib/fmt/issues/3140 ),
[#3142 ](https://github.com/fmtlib/fmt/pull/3142 ),
[#3149 ](https://github.com/fmtlib/fmt/issues/3149 ),
[#3150 ](https://github.com/fmtlib/fmt/pull/3150 ),
[#3154 ](https://github.com/fmtlib/fmt/issues/3154 ),
[#3163 ](https://github.com/fmtlib/fmt/issues/3163 ),
[#3178 ](https://github.com/fmtlib/fmt/issues/3178 ),
[#3184 ](https://github.com/fmtlib/fmt/pull/3184 ),
[#3196 ](https://github.com/fmtlib/fmt/pull/3196 ),
[#3204 ](https://github.com/fmtlib/fmt/issues/3204 ),
[#3206 ](https://github.com/fmtlib/fmt/pull/3206 ),
[#3208 ](https://github.com/fmtlib/fmt/pull/3208 ),
[#3213 ](https://github.com/fmtlib/fmt/issues/3213 ),
[#3216 ](https://github.com/fmtlib/fmt/pull/3216 ),
[#3224 ](https://github.com/fmtlib/fmt/issues/3224 ),
[#3226 ](https://github.com/fmtlib/fmt/issues/3226 ),
[#3228 ](https://github.com/fmtlib/fmt/issues/3228 ),
[#3229 ](https://github.com/fmtlib/fmt/pull/3229 ),
[#3259 ](https://github.com/fmtlib/fmt/pull/3259 ),
[#3274 ](https://github.com/fmtlib/fmt/issues/3274 ),
[#3287 ](https://github.com/fmtlib/fmt/issues/3287 ),
[#3288 ](https://github.com/fmtlib/fmt/pull/3288 ),
[#3292 ](https://github.com/fmtlib/fmt/issues/3292 ),
[#3295 ](https://github.com/fmtlib/fmt/pull/3295 ),
[#3296 ](https://github.com/fmtlib/fmt/pull/3296 ),
[#3298 ](https://github.com/fmtlib/fmt/issues/3298 ),
[#3325 ](https://github.com/fmtlib/fmt/issues/3325 ),
[#3326 ](https://github.com/fmtlib/fmt/pull/3326 ),
[#3334 ](https://github.com/fmtlib/fmt/issues/3334 ),
[#3342 ](https://github.com/fmtlib/fmt/issues/3342 ),
[#3343 ](https://github.com/fmtlib/fmt/pull/3343 ),
[#3351 ](https://github.com/fmtlib/fmt/issues/3351 ),
[#3352 ](https://github.com/fmtlib/fmt/pull/3352 ),
[#3362 ](https://github.com/fmtlib/fmt/pull/3362 ),
[#3365 ](https://github.com/fmtlib/fmt/issues/3365 ),
[#3366 ](https://github.com/fmtlib/fmt/pull/3366 ),
[#3374 ](https://github.com/fmtlib/fmt/pull/3374 ),
[#3377 ](https://github.com/fmtlib/fmt/issues/3377 ),
[#3378 ](https://github.com/fmtlib/fmt/pull/3378 ),
[#3381 ](https://github.com/fmtlib/fmt/issues/3381 ),
[#3398 ](https://github.com/fmtlib/fmt/pull/3398 ),
[#3413 ](https://github.com/fmtlib/fmt/pull/3413 ),
[#3415 ](https://github.com/fmtlib/fmt/issues/3415 )). Thanks
[\@phprus (Vladislav Shchapov) ](https://github.com/phprus ),
[\@gsjaardema (Greg Sjaardema) ](https://github.com/gsjaardema ),
[\@NewbieOrange ](https://github.com/NewbieOrange ), [\@EngineLessCC
(VivyaCC)](https://github.com/EngineLessCC), [\@asmaloney (Andy
Maloney)](https://github.com/asmaloney), [\@HazardyKnusperkeks
(Björn Schäpers)](https://github.com/HazardyKnusperkeks), [\@sergiud
(Sergiu Deitsch)](https://github.com/sergiud), [\@Youw (Ihor
Dutchak)](https://github.com/Youw),
[\@thesmurph ](https://github.com/thesmurph ), [\@czudziakm
(Maksymilian Czudziak)](https://github.com/czudziakm),
[\@Roman-Koshelev ](https://github.com/Roman-Koshelev ), [\@chronoxor
(Ivan Shynkarenka)](https://github.com/chronoxor), [\@ShawnZhong
(Shawn Zhong)](https://github.com/ShawnZhong), [\@russelltg (Russell
Greene)](https://github.com/russelltg), [\@glebm (Gleb
Mazovetskiy)](https://github.com/glebm),
[\@tmartin-gh ](https://github.com/tmartin-gh ), [\@Zhaojun-Liu (June
Liu)](https://github.com/Zhaojun-Liu), [\@louiswins (Louis
Wilson)](https://github.com/louiswins),
[\@mogemimi ](https://github.com/mogemimi ).
# 9.1.0 - 2022-08-27
- `fmt::formatted_size` now works at compile time
([#3026](https://github.com/fmtlib/fmt/pull/3026)). For example
([godbolt](https://godbolt.org/z/1MW5rMdf8)):
```c++
#include < fmt / compile . h >
int main() {
using namespace fmt::literals;
constexpr size_t n = fmt::formatted_size("{}"_cf, 42);
fmt::print("{}\n", n); // prints 2
}
```
Thanks [\@marksantaniello (Mark
Santaniello)](https://github.com/marksantaniello).
- Fixed handling of invalid UTF-8
([#3038](https://github.com/fmtlib/fmt/pull/3038),
[#3044 ](https://github.com/fmtlib/fmt/pull/3044 ),
[#3056 ](https://github.com/fmtlib/fmt/pull/3056 )). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus) and [\@skeeto
(Christopher Wellons)](https://github.com/skeeto).
- Improved Unicode support in `ostream` overloads of `print`
([#2994](https://github.com/fmtlib/fmt/pull/2994),
[#3001 ](https://github.com/fmtlib/fmt/pull/3001 ),
[#3025 ](https://github.com/fmtlib/fmt/pull/3025 )). Thanks
[\@dimztimz (Dimitrij Mijoski) ](https://github.com/dimztimz ).
- Fixed handling of the sign specifier in localized formatting on
systems with 32-bit `wchar_t`
([#3041](https://github.com/fmtlib/fmt/issues/3041)).
- Added support for wide streams to `fmt::streamed`
([#2994](https://github.com/fmtlib/fmt/pull/2994)). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Added the `n` specifier that disables the output of delimiters when
formatting ranges ([#2981](https://github.com/fmtlib/fmt/pull/2981),
[#2983 ](https://github.com/fmtlib/fmt/pull/2983 )). For example
([godbolt](https://godbolt.org/z/roKqGdj8c)):
```c++
#include < fmt / ranges . h >
#include < vector >
int main() {
auto v = std::vector{1, 2, 3};
fmt::print("{:n}\n", v); // prints 1, 2, 3
}
```
Thanks [\@BRevzin (Barry Revzin) ](https://github.com/BRevzin ).
- Worked around problematic `std::string_view` constructors introduced
in C++23 ([#3030](https://github.com/fmtlib/fmt/issues/3030),
[#3050 ](https://github.com/fmtlib/fmt/issues/3050 )). Thanks
[\@strega-nil-ms (nicole
mazzuca)](https://github.com/strega-nil-ms).
- Improve handling (exclusion) of recursive ranges
([#2968](https://github.com/fmtlib/fmt/issues/2968),
[#2974 ](https://github.com/fmtlib/fmt/pull/2974 )). Thanks
[\@Dani-Hub (Daniel Krügler) ](https://github.com/Dani-Hub ).
- Improved error reporting in format string compilation
([#3055](https://github.com/fmtlib/fmt/issues/3055)).
- Improved the implementation of
[Dragonbox ](https://github.com/jk-jeon/dragonbox ), the algorithm
used for the default floating-point formatting
([#2984](https://github.com/fmtlib/fmt/pull/2984)). Thanks
[\@jk-jeon (Junekey Jeon) ](https://github.com/jk-jeon ).
- Fixed issues with floating-point formatting on exotic platforms.
- Improved the implementation of chrono formatting
([#3010](https://github.com/fmtlib/fmt/pull/3010)). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Improved documentation
([#2966](https://github.com/fmtlib/fmt/pull/2966),
[#3009 ](https://github.com/fmtlib/fmt/pull/3009 ),
[#3020 ](https://github.com/fmtlib/fmt/issues/3020 ),
[#3037 ](https://github.com/fmtlib/fmt/pull/3037 )). Thanks
[\@mwinterb ](https://github.com/mwinterb ), [\@jcelerier
(Jean-Michaël Celerier)](https://github.com/jcelerier) and
[\@remiburtin (Rémi Burtin) ](https://github.com/remiburtin ).
- Improved build configuration
([#2991](https://github.com/fmtlib/fmt/pull/2991),
[#2995 ](https://github.com/fmtlib/fmt/pull/2995 ),
[#3004 ](https://github.com/fmtlib/fmt/issues/3004 ),
[#3007 ](https://github.com/fmtlib/fmt/pull/3007 ),
[#3040 ](https://github.com/fmtlib/fmt/pull/3040 )). Thanks
[\@dimztimz (Dimitrij Mijoski) ](https://github.com/dimztimz ) and
[\@hwhsu1231 (Haowei Hsu) ](https://github.com/hwhsu1231 ).
- Fixed various warnings and compilation issues
([#2969](https://github.com/fmtlib/fmt/issues/2969),
[#2971 ](https://github.com/fmtlib/fmt/pull/2971 ),
[#2975 ](https://github.com/fmtlib/fmt/issues/2975 ),
[#2982 ](https://github.com/fmtlib/fmt/pull/2982 ),
[#2985 ](https://github.com/fmtlib/fmt/pull/2985 ),
[#2988 ](https://github.com/fmtlib/fmt/issues/2988 ),
[#2989 ](https://github.com/fmtlib/fmt/issues/2989 ),
[#3000 ](https://github.com/fmtlib/fmt/issues/3000 ),
[#3006 ](https://github.com/fmtlib/fmt/issues/3006 ),
[#3014 ](https://github.com/fmtlib/fmt/issues/3014 ),
[#3015 ](https://github.com/fmtlib/fmt/issues/3015 ),
[#3021 ](https://github.com/fmtlib/fmt/pull/3021 ),
[#3023 ](https://github.com/fmtlib/fmt/issues/3023 ),
[#3024 ](https://github.com/fmtlib/fmt/pull/3024 ),
[#3029 ](https://github.com/fmtlib/fmt/pull/3029 ),
[#3043 ](https://github.com/fmtlib/fmt/pull/3043 ),
[#3052 ](https://github.com/fmtlib/fmt/issues/3052 ),
[#3053 ](https://github.com/fmtlib/fmt/pull/3053 ),
[#3054 ](https://github.com/fmtlib/fmt/pull/3054 )). Thanks
[\@h-friederich (Hannes
Friederich)](https://github.com/h-friederich), [\@dimztimz (Dimitrij
Mijoski)](https://github.com/dimztimz), [\@olupton (Olli
Lupton)](https://github.com/olupton), [\@bernhardmgruber (Bernhard
Manfred Gruber)](https://github.com/bernhardmgruber), [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
# 9.0.0 - 2022-07-04
- Switched to the internal floating point formatter for all decimal
presentation formats. In particular this results in consistent
rounding on all platforms and removing the `s[n]printf` fallback for
decimal FP formatting.
- Compile-time floating point formatting no longer requires the
header-only mode. For example
([godbolt](https://godbolt.org/z/G37PTeG3b)):
```c++
#include < array >
#include < fmt / compile . h >
consteval auto compile_time_dtoa(double value) -> std::array< char , 10 > {
auto result = std::array< char , 10 > ();
fmt::format_to(result.data(), FMT_COMPILE("{}"), value);
return result;
}
constexpr auto answer = compile_time_dtoa(0.42);
```
works with the default settings.
- Improved the implementation of
[Dragonbox ](https://github.com/jk-jeon/dragonbox ), the algorithm
used for the default floating-point formatting
([#2713](https://github.com/fmtlib/fmt/pull/2713),
[#2750 ](https://github.com/fmtlib/fmt/pull/2750 )). Thanks [\@jk-jeon
(Junekey Jeon)](https://github.com/jk-jeon).
- Made `fmt::to_string` work with `__float128` . This uses the internal
FP formatter and works even on system without `__float128` support
in `[s]printf` .
- Disabled automatic `std::ostream` insertion operator (`operator<< `)
discovery when `fmt/ostream.h` is included to prevent ODR
violations. You can get the old behavior by defining
`FMT_DEPRECATED_OSTREAM` but this will be removed in the next major
release. Use `fmt::streamed` or `fmt::ostream_formatter` to enable
formatting via `std::ostream` instead.
- Added `fmt::ostream_formatter` that can be used to write `formatter`
specializations that perform formatting via `std::ostream` . For
example ([godbolt](https://godbolt.org/z/5sEc5qMsf)):
```c++
#include < fmt / ostream . h >
struct date {
int year, month, day;
friend std::ostream& operator< < (std::ostream& os, const date& d) {
return os < < d.year < < ' - ' < < d . month < < ' - ' < < d . day ;
}
};
template < > struct fmt::formatter< date > : ostream_formatter {};
std::string s = fmt::format("The date is {}", date{2012, 12, 9});
// s == "The date is 2012-12-9"
```
- Added the `fmt::streamed` function that takes an object and formats
it via `std::ostream` . For example
([godbolt](https://godbolt.org/z/5G3346G1f)):
```c++
#include < thread >
#include < fmt / ostream . h >
int main() {
fmt::print("Current thread id: {}\n",
fmt::streamed(std::this_thread::get_id()));
}
```
Note that `fmt/std.h` provides a `formatter` specialization for
`std::thread::id` so you don\'t need to format it via
`std::ostream` .
- Deprecated implicit conversions of unscoped enums to integers for
consistency with scoped enums.
- Added an argument-dependent lookup based `format_as` extension API
to simplify formatting of enums.
- Added experimental `std::variant` formatting support
([#2941](https://github.com/fmtlib/fmt/pull/2941)). For example
([godbolt](https://godbolt.org/z/KG9z6cq68)):
```c++
#include < variant >
#include < fmt / std . h >
int main() {
auto v = std::variant< int , std::string > (42);
fmt::print("{}\n", v);
}
```
prints:
variant(42)
Thanks [\@jehelset ](https://github.com/jehelset ).
- Added experimental `std::filesystem::path` formatting support
([#2865](https://github.com/fmtlib/fmt/issues/2865),
[#2902 ](https://github.com/fmtlib/fmt/pull/2902 ),
[#2917 ](https://github.com/fmtlib/fmt/issues/2917 ),
[#2918 ](https://github.com/fmtlib/fmt/pull/2918 )). For example
([godbolt](https://godbolt.org/z/o44dMexEb)):
```c++
#include < filesystem >
#include < fmt / std . h >
int main() {
fmt::print("There is no place like {}.", std::filesystem::path("/home"));
}
```
prints:
There is no place like "/home".
Thanks [\@phprus (Vladislav Shchapov) ](https://github.com/phprus ).
- Added a `std::thread::id` formatter to `fmt/std.h` . For example
([godbolt](https://godbolt.org/z/j1azbYf3E)):
```c++
#include < thread >
#include < fmt / std . h >
int main() {
fmt::print("Current thread id: {}\n", std::this_thread::get_id());
}
```
- Added `fmt::styled` that applies a text style to an individual
argument ([#2793](https://github.com/fmtlib/fmt/pull/2793)). For
example ([godbolt](https://godbolt.org/z/vWGW7v5M6)):
```c++
#include < fmt / chrono . h >
#include < fmt / color . h >
int main() {
auto now = std::chrono::system_clock::now();
fmt::print(
"[{}] {}: {}\n",
fmt::styled(now, fmt::emphasis::bold),
fmt::styled("error", fg(fmt::color::red)),
"something went wrong");
}
```
prints
2023-09-04 14:59:30 +00:00
2023-09-04 14:07:24 +00:00
Thanks [\@rbrugo (Riccardo Brugo) ](https://github.com/rbrugo ).
- Made `fmt::print` overload for text styles correctly handle UTF-8
([#2681](https://github.com/fmtlib/fmt/issues/2681),
[#2701 ](https://github.com/fmtlib/fmt/pull/2701 )). Thanks
[\@AlexGuteniev (Alex Guteniev) ](https://github.com/AlexGuteniev ).
- Fixed Unicode handling when writing to an ostream.
- Added support for nested specifiers to range formatting
([#2673](https://github.com/fmtlib/fmt/pull/2673)). For example
([godbolt](https://godbolt.org/z/xd3Gj38cf)):
```c++
#include < vector >
#include < fmt / ranges . h >
int main() {
fmt::print("{::#x}\n", std::vector{10, 20, 30});
}
```
prints `[0xa, 0x14, 0x1e]` .
Thanks [\@BRevzin (Barry Revzin) ](https://github.com/BRevzin ).
- Implemented escaping of wide strings in ranges
([#2904](https://github.com/fmtlib/fmt/pull/2904)). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Added support for ranges with `begin` / `end` found via the
argument-dependent lookup
([#2807](https://github.com/fmtlib/fmt/pull/2807)). Thanks [\@rbrugo
(Riccardo Brugo)](https://github.com/rbrugo).
- Fixed formatting of certain kinds of ranges of ranges
([#2787](https://github.com/fmtlib/fmt/pull/2787)). Thanks
[\@BRevzin (Barry Revzin) ](https://github.com/BRevzin ).
- Fixed handling of maps with element types other than `std::pair`
([#2944](https://github.com/fmtlib/fmt/pull/2944)). Thanks
[\@BrukerJWD (Jonathan W) ](https://github.com/BrukerJWD ).
- Made tuple formatter enabled only if elements are formattable
([#2939](https://github.com/fmtlib/fmt/issues/2939),
[#2940 ](https://github.com/fmtlib/fmt/pull/2940 )). Thanks
[\@jehelset ](https://github.com/jehelset ).
- Made `fmt::join` compatible with format string compilation
([#2719](https://github.com/fmtlib/fmt/issues/2719),
[#2720 ](https://github.com/fmtlib/fmt/pull/2720 )). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Made compile-time checks work with named arguments of custom types
and `std::ostream` `print` overloads
([#2816](https://github.com/fmtlib/fmt/issues/2816),
[#2817 ](https://github.com/fmtlib/fmt/issues/2817 ),
[#2819 ](https://github.com/fmtlib/fmt/pull/2819 )). Thanks
[\@timsong-cpp ](https://github.com/timsong-cpp ).
- Removed `make_args_checked` because it is no longer needed for
compile-time checks
([#2760](https://github.com/fmtlib/fmt/pull/2760)). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Removed the following deprecated APIs: `_format` , `arg_join` , the
`format_to` overload that takes a memory buffer, `[v]fprintf` that
takes an `ostream` .
- Removed the deprecated implicit conversion of `[const] signed char*`
and `[const] unsigned char*` to C strings.
- Removed the deprecated `fmt/locale.h` .
- Replaced the deprecated `fileno()` with `descriptor()` in
`buffered_file` .
- Moved `to_string_view` to the `detail` namespace since it\'s an
implementation detail.
- Made access mode of a created file consistent with `fopen` by
setting `S_IWGRP` and `S_IWOTH`
([#2733](https://github.com/fmtlib/fmt/pull/2733)). Thanks [\@arogge
(Andreas Rogge)](https://github.com/arogge).
- Removed a redundant buffer resize when formatting to `std::ostream`
([#2842](https://github.com/fmtlib/fmt/issues/2842),
[#2843 ](https://github.com/fmtlib/fmt/pull/2843 )). Thanks
[\@jcelerier (Jean-Michaël Celerier) ](https://github.com/jcelerier ).
- Made precision computation for strings consistent with width
([#2888](https://github.com/fmtlib/fmt/issues/2888)).
- Fixed handling of locale separators in floating point formatting
([#2830](https://github.com/fmtlib/fmt/issues/2830)).
- Made sign specifiers work with `__int128_t`
([#2773](https://github.com/fmtlib/fmt/issues/2773)).
- Improved support for systems such as CHERI with extra data stored in
pointers ([#2932](https://github.com/fmtlib/fmt/pull/2932)). Thanks
[\@davidchisnall (David
Chisnall)](https://github.com/davidchisnall).
- Improved documentation
([#2706](https://github.com/fmtlib/fmt/pull/2706),
[#2712 ](https://github.com/fmtlib/fmt/pull/2712 ),
[#2789 ](https://github.com/fmtlib/fmt/pull/2789 ),
[#2803 ](https://github.com/fmtlib/fmt/pull/2803 ),
[#2805 ](https://github.com/fmtlib/fmt/pull/2805 ),
[#2815 ](https://github.com/fmtlib/fmt/pull/2815 ),
[#2924 ](https://github.com/fmtlib/fmt/pull/2924 )). Thanks [\@BRevzin
(Barry Revzin)](https://github.com/BRevzin),
[\@Pokechu22 ](https://github.com/Pokechu22 ), [\@setoye
(Alta)](https://github.com/setoye),
[\@rtobar ](https://github.com/rtobar ), [\@rbrugo (Riccardo
Brugo)](https://github.com/rbrugo), [\@anoonD
(cre)](https://github.com/anoonD), [\@leha-bot
(Alex)](https://github.com/leha-bot).
- Improved build configuration
([#2766](https://github.com/fmtlib/fmt/pull/2766),
[#2772 ](https://github.com/fmtlib/fmt/pull/2772 ),
[#2836 ](https://github.com/fmtlib/fmt/pull/2836 ),
[#2852 ](https://github.com/fmtlib/fmt/pull/2852 ),
[#2907 ](https://github.com/fmtlib/fmt/pull/2907 ),
[#2913 ](https://github.com/fmtlib/fmt/pull/2913 ),
[#2914 ](https://github.com/fmtlib/fmt/pull/2914 )). Thanks
[\@kambala-decapitator (Andrey
Filipenkov)](https://github.com/kambala-decapitator),
[\@mattiasljungstrom (Mattias
Ljungström)](https://github.com/mattiasljungstrom), [\@kieselnb
(Nick Kiesel)](https://github.com/kieselnb),
[\@nathannaveen ](https://github.com/nathannaveen ),
[\@Vertexwahn ](https://github.com/Vertexwahn ).
- Fixed various warnings and compilation issues
([#2408](https://github.com/fmtlib/fmt/issues/2408),
[#2507 ](https://github.com/fmtlib/fmt/issues/2507 ),
[#2697 ](https://github.com/fmtlib/fmt/issues/2697 ),
[#2715 ](https://github.com/fmtlib/fmt/issues/2715 ),
[#2717 ](https://github.com/fmtlib/fmt/issues/2717 ),
[#2722 ](https://github.com/fmtlib/fmt/pull/2722 ),
[#2724 ](https://github.com/fmtlib/fmt/pull/2724 ),
[#2725 ](https://github.com/fmtlib/fmt/pull/2725 ),
[#2726 ](https://github.com/fmtlib/fmt/issues/2726 ),
[#2728 ](https://github.com/fmtlib/fmt/pull/2728 ),
[#2732 ](https://github.com/fmtlib/fmt/pull/2732 ),
[#2738 ](https://github.com/fmtlib/fmt/issues/2738 ),
[#2742 ](https://github.com/fmtlib/fmt/pull/2742 ),
[#2744 ](https://github.com/fmtlib/fmt/issues/2744 ),
[#2745 ](https://github.com/fmtlib/fmt/issues/2745 ),
[#2746 ](https://github.com/fmtlib/fmt/issues/2746 ),
[#2754 ](https://github.com/fmtlib/fmt/issues/2754 ),
[#2755 ](https://github.com/fmtlib/fmt/pull/2755 ),
[#2757 ](https://github.com/fmtlib/fmt/issues/2757 ),
[#2758 ](https://github.com/fmtlib/fmt/pull/2758 ),
[#2761 ](https://github.com/fmtlib/fmt/issues/2761 ),
[#2762 ](https://github.com/fmtlib/fmt/pull/2762 ),
[#2763 ](https://github.com/fmtlib/fmt/issues/2763 ),
[#2765 ](https://github.com/fmtlib/fmt/pull/2765 ),
[#2769 ](https://github.com/fmtlib/fmt/issues/2769 ),
[#2770 ](https://github.com/fmtlib/fmt/pull/2770 ),
[#2771 ](https://github.com/fmtlib/fmt/issues/2771 ),
[#2777 ](https://github.com/fmtlib/fmt/issues/2777 ),
[#2779 ](https://github.com/fmtlib/fmt/pull/2779 ),
[#2782 ](https://github.com/fmtlib/fmt/pull/2782 ),
[#2783 ](https://github.com/fmtlib/fmt/pull/2783 ),
[#2794 ](https://github.com/fmtlib/fmt/issues/2794 ),
[#2796 ](https://github.com/fmtlib/fmt/issues/2796 ),
[#2797 ](https://github.com/fmtlib/fmt/pull/2797 ),
[#2801 ](https://github.com/fmtlib/fmt/pull/2801 ),
[#2802 ](https://github.com/fmtlib/fmt/pull/2802 ),
[#2808 ](https://github.com/fmtlib/fmt/issues/2808 ),
[#2818 ](https://github.com/fmtlib/fmt/issues/2818 ),
[#2819 ](https://github.com/fmtlib/fmt/pull/2819 ),
[#2829 ](https://github.com/fmtlib/fmt/issues/2829 ),
[#2835 ](https://github.com/fmtlib/fmt/issues/2835 ),
[#2848 ](https://github.com/fmtlib/fmt/issues/2848 ),
[#2860 ](https://github.com/fmtlib/fmt/issues/2860 ),
[#2861 ](https://github.com/fmtlib/fmt/pull/2861 ),
[#2882 ](https://github.com/fmtlib/fmt/pull/2882 ),
[#2886 ](https://github.com/fmtlib/fmt/issues/2886 ),
[#2891 ](https://github.com/fmtlib/fmt/issues/2891 ),
[#2892 ](https://github.com/fmtlib/fmt/pull/2892 ),
[#2895 ](https://github.com/fmtlib/fmt/issues/2895 ),
[#2896 ](https://github.com/fmtlib/fmt/issues/2896 ),
[#2903 ](https://github.com/fmtlib/fmt/pull/2903 ),
[#2906 ](https://github.com/fmtlib/fmt/issues/2906 ),
[#2908 ](https://github.com/fmtlib/fmt/issues/2908 ),
[#2909 ](https://github.com/fmtlib/fmt/pull/2909 ),
[#2920 ](https://github.com/fmtlib/fmt/issues/2920 ),
[#2922 ](https://github.com/fmtlib/fmt/pull/2922 ),
[#2927 ](https://github.com/fmtlib/fmt/pull/2927 ),
[#2929 ](https://github.com/fmtlib/fmt/pull/2929 ),
[#2936 ](https://github.com/fmtlib/fmt/issues/2936 ),
[#2937 ](https://github.com/fmtlib/fmt/pull/2937 ),
[#2938 ](https://github.com/fmtlib/fmt/pull/2938 ),
[#2951 ](https://github.com/fmtlib/fmt/pull/2951 ),
[#2954 ](https://github.com/fmtlib/fmt/issues/2954 ),
[#2957 ](https://github.com/fmtlib/fmt/pull/2957 ),
[#2958 ](https://github.com/fmtlib/fmt/issues/2958 ),
[#2960 ](https://github.com/fmtlib/fmt/pull/2960 )). Thanks
[\@matrackif ](https://github.com/matrackif ) [\@Tobi823 (Tobias
Hellmann)](https://github.com/Tobi823), [\@ivan-volnov (Ivan
Volnov)](https://github.com/ivan-volnov),
[\@VasiliPupkin256 ](https://github.com/VasiliPupkin256 ),
[\@federico-busato (Federico) ](https://github.com/federico-busato ),
[\@barcharcraz (Charlie Barto) ](https://github.com/barcharcraz ),
[\@jk-jeon (Junekey Jeon) ](https://github.com/jk-jeon ),
[\@HazardyKnusperkeks (Björn
Schäpers)](https://github.com/HazardyKnusperkeks), [\@dalboris
(Boris Dalstein)](https://github.com/dalboris), [\@seanm (Sean
McBride)](https://github.com/seanm), [\@gsjaardema (Greg
Sjaardema)](https://github.com/gsjaardema),
[\@timsong-cpp ](https://github.com/timsong-cpp ), [\@seanm (Sean
McBride)](https://github.com/seanm),
[\@frithrah ](https://github.com/frithrah ), [\@chronoxor (Ivan
Shynkarenka)](https://github.com/chronoxor),
[\@Agga ](https://github.com/Agga ), [\@madmaxoft (Mattes
D)](https://github.com/madmaxoft), [\@JurajX
(Juraj)](https://github.com/JurajX), [\@phprus (Vladislav
Shchapov)](https://github.com/phprus), [\@Dani-Hub (Daniel
Krügler)](https://github.com/Dani-Hub).
# 8.1.1 - 2022-01-06
- Restored ABI compatibility with version 8.0.x
([#2695](https://github.com/fmtlib/fmt/issues/2695),
[#2696 ](https://github.com/fmtlib/fmt/pull/2696 )). Thanks
[\@saraedum (Julian Rüth) ](https://github.com/saraedum ).
- Fixed chrono formatting on big endian systems
([#2698](https://github.com/fmtlib/fmt/issues/2698),
[#2699 ](https://github.com/fmtlib/fmt/pull/2699 )). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus) and [\@xvitaly
(Vitaly Zaitsev)](https://github.com/xvitaly).
- Fixed a linkage error with mingw
([#2691](https://github.com/fmtlib/fmt/issues/2691),
[#2692 ](https://github.com/fmtlib/fmt/pull/2692 )). Thanks
[\@rbberger (Richard Berger) ](https://github.com/rbberger ).
# 8.1.0 - 2022-01-02
- Optimized chrono formatting
([#2500](https://github.com/fmtlib/fmt/pull/2500),
[#2537 ](https://github.com/fmtlib/fmt/pull/2537 ),
[#2541 ](https://github.com/fmtlib/fmt/issues/2541 ),
[#2544 ](https://github.com/fmtlib/fmt/pull/2544 ),
[#2550 ](https://github.com/fmtlib/fmt/pull/2550 ),
[#2551 ](https://github.com/fmtlib/fmt/pull/2551 ),
[#2576 ](https://github.com/fmtlib/fmt/pull/2576 ),
[#2577 ](https://github.com/fmtlib/fmt/issues/2577 ),
[#2586 ](https://github.com/fmtlib/fmt/pull/2586 ),
[#2591 ](https://github.com/fmtlib/fmt/pull/2591 ),
[#2594 ](https://github.com/fmtlib/fmt/pull/2594 ),
[#2602 ](https://github.com/fmtlib/fmt/pull/2602 ),
[#2617 ](https://github.com/fmtlib/fmt/pull/2617 ),
[#2628 ](https://github.com/fmtlib/fmt/issues/2628 ),
[#2633 ](https://github.com/fmtlib/fmt/pull/2633 ),
[#2670 ](https://github.com/fmtlib/fmt/issues/2670 ),
[#2671 ](https://github.com/fmtlib/fmt/pull/2671 )).
Processing of some specifiers such as `%z` and `%Y` is now up to
10-20 times faster, for example on GCC 11 with libstdc++:
----------------------------------------------------------------------------
Benchmark Before After
----------------------------------------------------------------------------
FMTFormatter_z 261 ns 26.3 ns
FMTFormatterCompile_z 246 ns 11.6 ns
FMTFormatter_Y 263 ns 26.1 ns
FMTFormatterCompile_Y 244 ns 10.5 ns
----------------------------------------------------------------------------
Thanks [\@phprus (Vladislav Shchapov) ](https://github.com/phprus )
and [\@toughengineer (Pavel
Novikov)](https://github.com/toughengineer).
- Implemented subsecond formatting for chrono durations
([#2623](https://github.com/fmtlib/fmt/pull/2623)). For example
([godbolt](https://godbolt.org/z/es7vWTETe)):
```c++
#include < fmt / chrono . h >
int main() {
fmt::print("{:%S}", std::chrono::milliseconds(1234));
}
```
prints \"01.234\".
Thanks [\@matrackif ](https://github.com/matrackif ).
- Fixed handling of precision 0 when formatting chrono durations
([#2587](https://github.com/fmtlib/fmt/issues/2587),
[#2588 ](https://github.com/fmtlib/fmt/pull/2588 )). Thanks
[\@lukester1975 ](https://github.com/lukester1975 ).
- Fixed an overflow on invalid inputs in the `tm` formatter
([#2564](https://github.com/fmtlib/fmt/pull/2564)). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Added `fmt::group_digits` that formats integers with a non-localized
digit separator (comma) for groups of three digits. For example
([godbolt](https://godbolt.org/z/TxGxG9Poq)):
```c++
#include < fmt / format . h >
int main() {
fmt::print("{} dollars", fmt::group_digits(1000000));
}
```
prints \"1,000,000 dollars\".
- Added support for faint, conceal, reverse and blink text styles
([#2394](https://github.com/fmtlib/fmt/pull/2394)):
< https: / / user-images . githubusercontent . com / 576385 / 147710227-c68f5317-f8fa-42c3-9123-7c4ba3c398cb . mp4 >
Thanks [\@benit8 (Benoît Lormeau) ](https://github.com/benit8 ) and
[\@data-man (Dmitry Atamanov) ](https://github.com/data-man ).
- Added experimental support for compile-time floating point
formatting ([#2426](https://github.com/fmtlib/fmt/pull/2426),
[#2470 ](https://github.com/fmtlib/fmt/pull/2470 )). It is currently
limited to the header-only mode. Thanks [\@alexezeder (Alexey
Ochapov)](https://github.com/alexezeder).
- Added UDL-based named argument support to compile-time format string
checks ([#2640](https://github.com/fmtlib/fmt/issues/2640),
[#2649 ](https://github.com/fmtlib/fmt/pull/2649 )). For example
([godbolt](https://godbolt.org/z/ohGbbvonv)):
```c++
#include < fmt / format . h >
int main() {
using namespace fmt::literals;
fmt::print("{answer:s}", "answer"_a=42);
}
```
gives a compile-time error on compilers with C++20 `consteval` and
non-type template parameter support (gcc 10+) because `s` is not a
valid format specifier for an integer.
Thanks [\@alexezeder (Alexey
Ochapov)](https://github.com/alexezeder).
- Implemented escaping of string range elements. For example
([godbolt](https://godbolt.org/z/rKvM1vKf3)):
```c++
#include < fmt / ranges . h >
#include < vector >
int main() {
fmt::print("{}", std::vector< std::string > {"\naan"});
}
```
is now printed as:
["\naan"]
instead of:
["
aan"]
- Added an experimental `?` specifier for escaping strings.
([#2674](https://github.com/fmtlib/fmt/pull/2674)). Thanks
[\@BRevzin (Barry Revzin) ](https://github.com/BRevzin ).
- Switched to JSON-like representation of maps and sets for
consistency with Python\'s `str.format` . For example
([godbolt](https://godbolt.org/z/seKjoY9W5)):
```c++
#include < fmt / ranges . h >
#include < map >
int main() {
fmt::print("{}", std::map< std::string , int > {{"answer", 42}});
}
```
is now printed as:
{"answer": 42}
- Extended `fmt::join` to support C++20-only ranges
([#2549](https://github.com/fmtlib/fmt/pull/2549)). Thanks
[\@BRevzin (Barry Revzin) ](https://github.com/BRevzin ).
- Optimized handling of non-const-iterable ranges and implemented
initial support for non-const-formattable types.
- Disabled implicit conversions of scoped enums to integers that was
accidentally introduced in earlier versions
([#1841](https://github.com/fmtlib/fmt/pull/1841)).
- Deprecated implicit conversion of `[const] signed char*` and
`[const] unsigned char*` to C strings.
- Deprecated `_format` , a legacy UDL-based format API
([#2646](https://github.com/fmtlib/fmt/pull/2646)). Thanks
[\@alexezeder (Alexey Ochapov) ](https://github.com/alexezeder ).
- Marked `format` , `formatted_size` and `to_string` as `[[nodiscard]]`
([#2612](https://github.com/fmtlib/fmt/pull/2612)). [\@0x8000-0000
(Florin Iucha)](https://github.com/0x8000-0000).
- Added missing diagnostic when trying to format function and member
pointers as well as objects convertible to pointers which is
explicitly disallowed
([#2598](https://github.com/fmtlib/fmt/issues/2598),
[#2609 ](https://github.com/fmtlib/fmt/pull/2609 ),
[#2610 ](https://github.com/fmtlib/fmt/pull/2610 )). Thanks
[\@AlexGuteniev (Alex Guteniev) ](https://github.com/AlexGuteniev ).
- Optimized writing to a contiguous buffer with `format_to_n`
([#2489](https://github.com/fmtlib/fmt/pull/2489)). Thanks
[\@Roman-Koshelev ](https://github.com/Roman-Koshelev ).
- Optimized writing to non-`char` buffers
([#2477](https://github.com/fmtlib/fmt/pull/2477)). Thanks
[\@Roman-Koshelev ](https://github.com/Roman-Koshelev ).
- Decimal point is now localized when using the `L` specifier.
- Improved floating point formatter implementation
([#2498](https://github.com/fmtlib/fmt/pull/2498),
[#2499 ](https://github.com/fmtlib/fmt/pull/2499 )). Thanks
[\@Roman-Koshelev ](https://github.com/Roman-Koshelev ).
- Fixed handling of very large precision in fixed format
([#2616](https://github.com/fmtlib/fmt/pull/2616)).
- Made a table of cached powers used in FP formatting static
([#2509](https://github.com/fmtlib/fmt/pull/2509)). Thanks
[\@jk-jeon (Junekey Jeon) ](https://github.com/jk-jeon ).
- Resolved a lookup ambiguity with C++20 format-related functions due
to ADL ([#2639](https://github.com/fmtlib/fmt/issues/2639),
[#2641 ](https://github.com/fmtlib/fmt/pull/2641 )). Thanks [\@mkurdej
(Marek Kurdej)](https://github.com/mkurdej).
- Removed unnecessary inline namespace qualification
([#2642](https://github.com/fmtlib/fmt/issues/2642),
[#2643 ](https://github.com/fmtlib/fmt/pull/2643 )). Thanks [\@mkurdej
(Marek Kurdej)](https://github.com/mkurdej).
- Implemented argument forwarding in `format_to_n`
([#2462](https://github.com/fmtlib/fmt/issues/2462),
[#2463 ](https://github.com/fmtlib/fmt/pull/2463 )). Thanks [\@owent
(WenTao Ou)](https://github.com/owent).
- Fixed handling of implicit conversions in `fmt::to_string` and
format string compilation
([#2565](https://github.com/fmtlib/fmt/issues/2565)).
- Changed the default access mode of files created by
`fmt::output_file` to `-rw-r--r--` for consistency with `fopen`
([#2530](https://github.com/fmtlib/fmt/issues/2530)).
- Make `fmt::ostream::flush` public
([#2435](https://github.com/fmtlib/fmt/issues/2435)).
- Improved C++14/17 attribute detection
([#2615](https://github.com/fmtlib/fmt/pull/2615)). Thanks
[\@AlexGuteniev (Alex Guteniev) ](https://github.com/AlexGuteniev ).
- Improved `consteval` detection for MSVC
([#2559](https://github.com/fmtlib/fmt/pull/2559)). Thanks
[\@DanielaE (Daniela Engert) ](https://github.com/DanielaE ).
- Improved documentation
([#2406](https://github.com/fmtlib/fmt/issues/2406),
[#2446 ](https://github.com/fmtlib/fmt/pull/2446 ),
[#2493 ](https://github.com/fmtlib/fmt/issues/2493 ),
[#2513 ](https://github.com/fmtlib/fmt/issues/2513 ),
[#2515 ](https://github.com/fmtlib/fmt/pull/2515 ),
[#2522 ](https://github.com/fmtlib/fmt/issues/2522 ),
[#2562 ](https://github.com/fmtlib/fmt/pull/2562 ),
[#2575 ](https://github.com/fmtlib/fmt/pull/2575 ),
[#2606 ](https://github.com/fmtlib/fmt/pull/2606 ),
[#2620 ](https://github.com/fmtlib/fmt/pull/2620 ),
[#2676 ](https://github.com/fmtlib/fmt/issues/2676 )). Thanks
[\@sobolevn (Nikita Sobolev) ](https://github.com/sobolevn ),
[\@UnePierre (Max FERGER) ](https://github.com/UnePierre ),
[\@zhsj ](https://github.com/zhsj ), [\@phprus (Vladislav
Shchapov)](https://github.com/phprus), [\@ericcurtin (Eric
Curtin)](https://github.com/ericcurtin),
[\@Lounarok ](https://github.com/Lounarok ).
- Improved fuzzers and added a fuzzer for chrono timepoint formatting
([#2461](https://github.com/fmtlib/fmt/pull/2461),
[#2469 ](https://github.com/fmtlib/fmt/pull/2469 )). [\@pauldreik
(Paul Dreik)](https://github.com/pauldreik),
- Added the `FMT_SYSTEM_HEADERS` CMake option setting which marks
{fmt}\'s headers as system. It can be used to suppress warnings
([#2644](https://github.com/fmtlib/fmt/issues/2644),
[#2651 ](https://github.com/fmtlib/fmt/pull/2651 )). Thanks
[\@alexezeder (Alexey Ochapov) ](https://github.com/alexezeder ).
- Added the Bazel build system support
([#2505](https://github.com/fmtlib/fmt/pull/2505),
[#2516 ](https://github.com/fmtlib/fmt/pull/2516 )). Thanks
[\@Vertexwahn ](https://github.com/Vertexwahn ).
- Improved build configuration and tests
([#2437](https://github.com/fmtlib/fmt/issues/2437),
[#2558 ](https://github.com/fmtlib/fmt/pull/2558 ),
[#2648 ](https://github.com/fmtlib/fmt/pull/2648 ),
[#2650 ](https://github.com/fmtlib/fmt/pull/2650 ),
[#2663 ](https://github.com/fmtlib/fmt/pull/2663 ),
[#2677 ](https://github.com/fmtlib/fmt/pull/2677 )). Thanks
[\@DanielaE (Daniela Engert) ](https://github.com/DanielaE ),
[\@alexezeder (Alexey Ochapov) ](https://github.com/alexezeder ),
[\@phprus (Vladislav Shchapov) ](https://github.com/phprus ).
- Fixed various warnings and compilation issues
([#2353](https://github.com/fmtlib/fmt/pull/2353),
[#2356 ](https://github.com/fmtlib/fmt/pull/2356 ),
[#2399 ](https://github.com/fmtlib/fmt/pull/2399 ),
[#2408 ](https://github.com/fmtlib/fmt/issues/2408 ),
[#2414 ](https://github.com/fmtlib/fmt/pull/2414 ),
[#2427 ](https://github.com/fmtlib/fmt/pull/2427 ),
[#2432 ](https://github.com/fmtlib/fmt/pull/2432 ),
[#2442 ](https://github.com/fmtlib/fmt/pull/2442 ),
[#2434 ](https://github.com/fmtlib/fmt/pull/2434 ),
[#2439 ](https://github.com/fmtlib/fmt/issues/2439 ),
[#2447 ](https://github.com/fmtlib/fmt/pull/2447 ),
[#2450 ](https://github.com/fmtlib/fmt/pull/2450 ),
[#2455 ](https://github.com/fmtlib/fmt/issues/2455 ),
[#2465 ](https://github.com/fmtlib/fmt/issues/2465 ),
[#2472 ](https://github.com/fmtlib/fmt/issues/2472 ),
[#2474 ](https://github.com/fmtlib/fmt/issues/2474 ),
[#2476 ](https://github.com/fmtlib/fmt/pull/2476 ),
[#2478 ](https://github.com/fmtlib/fmt/issues/2478 ),
[#2479 ](https://github.com/fmtlib/fmt/issues/2479 ),
[#2481 ](https://github.com/fmtlib/fmt/issues/2481 ),
[#2482 ](https://github.com/fmtlib/fmt/pull/2482 ),
[#2483 ](https://github.com/fmtlib/fmt/pull/2483 ),
[#2490 ](https://github.com/fmtlib/fmt/issues/2490 ),
[#2491 ](https://github.com/fmtlib/fmt/pull/2491 ),
[#2510 ](https://github.com/fmtlib/fmt/pull/2510 ),
[#2518 ](https://github.com/fmtlib/fmt/pull/2518 ),
[#2528 ](https://github.com/fmtlib/fmt/issues/2528 ),
[#2529 ](https://github.com/fmtlib/fmt/pull/2529 ),
[#2539 ](https://github.com/fmtlib/fmt/pull/2539 ),
[#2540 ](https://github.com/fmtlib/fmt/issues/2540 ),
[#2545 ](https://github.com/fmtlib/fmt/pull/2545 ),
[#2555 ](https://github.com/fmtlib/fmt/pull/2555 ),
[#2557 ](https://github.com/fmtlib/fmt/issues/2557 ),
[#2570 ](https://github.com/fmtlib/fmt/issues/2570 ),
[#2573 ](https://github.com/fmtlib/fmt/pull/2573 ),
[#2582 ](https://github.com/fmtlib/fmt/pull/2582 ),
[#2605 ](https://github.com/fmtlib/fmt/issues/2605 ),
[#2611 ](https://github.com/fmtlib/fmt/pull/2611 ),
[#2647 ](https://github.com/fmtlib/fmt/pull/2647 ),
[#2627 ](https://github.com/fmtlib/fmt/issues/2627 ),
[#2630 ](https://github.com/fmtlib/fmt/pull/2630 ),
[#2635 ](https://github.com/fmtlib/fmt/issues/2635 ),
[#2638 ](https://github.com/fmtlib/fmt/issues/2638 ),
[#2653 ](https://github.com/fmtlib/fmt/issues/2653 ),
[#2654 ](https://github.com/fmtlib/fmt/issues/2654 ),
[#2661 ](https://github.com/fmtlib/fmt/issues/2661 ),
[#2664 ](https://github.com/fmtlib/fmt/pull/2664 ),
[#2684 ](https://github.com/fmtlib/fmt/pull/2684 )). Thanks
[\@DanielaE (Daniela Engert) ](https://github.com/DanielaE ),
[\@mwinterb ](https://github.com/mwinterb ), [\@cdacamar (Cameron
DaCamara)](https://github.com/cdacamar), [\@TrebledJ
(Johnathan)](https://github.com/TrebledJ), [\@bodomartin
(brm)](https://github.com/bodomartin), [\@cquammen (Cory
Quammen)](https://github.com/cquammen), [\@white238 (Chris
White)](https://github.com/white238), [\@mmarkeloff
(Max)](https://github.com/mmarkeloff), [\@palacaze (Pierre-Antoine
Lacaze)](https://github.com/palacaze), [\@jcelerier (Jean-Michaël
Celerier)](https://github.com/jcelerier), [\@mborn-adi (Mathias
Born)](https://github.com/mborn-adi), [\@BrukerJWD (Jonathan
W)](https://github.com/BrukerJWD), [\@spyridon97 (Spiros
Tsalikis)](https://github.com/spyridon97), [\@phprus (Vladislav
Shchapov)](https://github.com/phprus), [\@oliverlee (Oliver
Lee)](https://github.com/oliverlee), [\@joshessman-llnl (Josh
Essman)](https://github.com/joshessman-llnl), [\@akohlmey (Axel
Kohlmeyer)](https://github.com/akohlmey),
[\@timkalu ](https://github.com/timkalu ), [\@olupton (Olli
Lupton)](https://github.com/olupton),
[\@Acretock ](https://github.com/Acretock ), [\@alexezeder (Alexey
Ochapov)](https://github.com/alexezeder), [\@andrewcorrigan (Andrew
Corrigan)](https://github.com/andrewcorrigan),
[\@lucpelletier ](https://github.com/lucpelletier ),
[\@HazardyKnusperkeks (Björn
Schäpers)](https://github.com/HazardyKnusperkeks).
# 8.0.1 - 2021-07-02
- Fixed the version number in the inline namespace
([#2374](https://github.com/fmtlib/fmt/issues/2374)).
- Added a missing presentation type check for `std::string`
([#2402](https://github.com/fmtlib/fmt/issues/2402)).
- Fixed a linkage error when mixing code built with clang and gcc
([#2377](https://github.com/fmtlib/fmt/issues/2377)).
- Fixed documentation issues
([#2396](https://github.com/fmtlib/fmt/pull/2396),
[#2403 ](https://github.com/fmtlib/fmt/issues/2403 ),
[#2406 ](https://github.com/fmtlib/fmt/issues/2406 )). Thanks
[\@mkurdej (Marek Kurdej) ](https://github.com/mkurdej ).
- Removed dead code in FP formatter (
[#2398 ](https://github.com/fmtlib/fmt/pull/2398 )). Thanks
[\@javierhonduco (Javier Honduvilla
Coto)](https://github.com/javierhonduco).
- Fixed various warnings and compilation issues
([#2351](https://github.com/fmtlib/fmt/issues/2351),
[#2359 ](https://github.com/fmtlib/fmt/issues/2359 ),
[#2365 ](https://github.com/fmtlib/fmt/pull/2365 ),
[#2368 ](https://github.com/fmtlib/fmt/issues/2368 ),
[#2370 ](https://github.com/fmtlib/fmt/pull/2370 ),
[#2376 ](https://github.com/fmtlib/fmt/pull/2376 ),
[#2381 ](https://github.com/fmtlib/fmt/pull/2381 ),
[#2382 ](https://github.com/fmtlib/fmt/pull/2382 ),
[#2386 ](https://github.com/fmtlib/fmt/issues/2386 ),
[#2389 ](https://github.com/fmtlib/fmt/pull/2389 ),
[#2395 ](https://github.com/fmtlib/fmt/pull/2395 ),
[#2397 ](https://github.com/fmtlib/fmt/pull/2397 ),
[#2400 ](https://github.com/fmtlib/fmt/issues/2400 ),
[#2401 ](https://github.com/fmtlib/fmt/issues/2401 ),
[#2407 ](https://github.com/fmtlib/fmt/pull/2407 )). Thanks [\@zx2c4
(Jason A. Donenfeld)](https://github.com/zx2c4), [\@AidanSun05
(Aidan Sun)](https://github.com/AidanSun05), [\@mattiasljungstrom
(Mattias Ljungström)](https://github.com/mattiasljungstrom),
[\@joemmett (Jonathan Emmett) ](https://github.com/joemmett ),
[\@erengy (Eren Okka) ](https://github.com/erengy ), [\@patlkli
(Patrick Geltinger)](https://github.com/patlkli), [\@gsjaardema
(Greg Sjaardema)](https://github.com/gsjaardema), [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
# 8.0.0 - 2021-06-21
- Enabled compile-time format string checks by default. For example
([godbolt](https://godbolt.org/z/sMxcohGjz)):
```c++
#include < fmt / core . h >
int main() {
fmt::print("{:d}", "I am not a number");
}
```
gives a compile-time error on compilers with C++20 `consteval`
support (gcc 10+, clang 11+) because `d` is not a valid format
specifier for a string.
To pass a runtime string wrap it in `fmt::runtime` :
```c++
fmt::print(fmt::runtime("{:d}"), "I am not a number");
```
- Added compile-time formatting
([#2019](https://github.com/fmtlib/fmt/pull/2019),
[#2044 ](https://github.com/fmtlib/fmt/pull/2044 ),
[#2056 ](https://github.com/fmtlib/fmt/pull/2056 ),
[#2072 ](https://github.com/fmtlib/fmt/pull/2072 ),
[#2075 ](https://github.com/fmtlib/fmt/pull/2075 ),
[#2078 ](https://github.com/fmtlib/fmt/issues/2078 ),
[#2129 ](https://github.com/fmtlib/fmt/pull/2129 ),
[#2326 ](https://github.com/fmtlib/fmt/pull/2326 )). For example
([godbolt](https://godbolt.org/z/Mxx9d89jM)):
```c++
#include < fmt / compile . h >
consteval auto compile_time_itoa(int value) -> std::array< char , 10 > {
auto result = std::array< char , 10 > ();
fmt::format_to(result.data(), FMT_COMPILE("{}"), value);
return result;
}
constexpr auto answer = compile_time_itoa(42);
```
Most of the formatting functionality is available at compile time
with a notable exception of floating-point numbers and pointers.
Thanks [\@alexezeder (Alexey
Ochapov)](https://github.com/alexezeder).
- Optimized handling of format specifiers during format string
compilation. For example, hexadecimal formatting (`"{:x}"`) is now
3-7x faster than before when using `format_to` with format string
compilation and a stack-allocated buffer
([#1944](https://github.com/fmtlib/fmt/issues/1944)).
Before (7.1.3):
----------------------------------------------------------------------------
Benchmark Time CPU Iterations
----------------------------------------------------------------------------
FMTCompileOld/0 15.5 ns 15.5 ns 43302898
FMTCompileOld/42 16.6 ns 16.6 ns 43278267
FMTCompileOld/273123 18.7 ns 18.6 ns 37035861
FMTCompileOld/9223372036854775807 19.4 ns 19.4 ns 35243000
----------------------------------------------------------------------------
After (8.x):
----------------------------------------------------------------------------
Benchmark Time CPU Iterations
----------------------------------------------------------------------------
FMTCompileNew/0 1.99 ns 1.99 ns 360523686
FMTCompileNew/42 2.33 ns 2.33 ns 279865664
FMTCompileNew/273123 3.72 ns 3.71 ns 190230315
FMTCompileNew/9223372036854775807 5.28 ns 5.26 ns 130711631
----------------------------------------------------------------------------
It is even faster than `std::to_chars` from libc++ compiled with
clang on macOS:
----------------------------------------------------------------------------
Benchmark Time CPU Iterations
----------------------------------------------------------------------------
ToChars/0 4.42 ns 4.41 ns 160196630
ToChars/42 5.00 ns 4.98 ns 140735201
ToChars/273123 7.26 ns 7.24 ns 95784130
ToChars/9223372036854775807 8.77 ns 8.75 ns 75872534
----------------------------------------------------------------------------
In other cases, especially involving `std::string` construction, the
speed up is usually lower because handling format specifiers takes a
smaller fraction of the total time.
- Added the `_cf` user-defined literal to represent a compiled format
string. It can be used instead of the `FMT_COMPILE` macro
([#2043](https://github.com/fmtlib/fmt/pull/2043),
[#2242 ](https://github.com/fmtlib/fmt/pull/2242 )):
```c++
#include < fmt / compile . h >
using namespace fmt::literals;
auto s = fmt::format(FMT_COMPILE("{}"), 42); // 🙁 not modern
auto s = fmt::format("{}"_cf, 42); // 🙂 modern as hell
```
It requires compiler support for class types in non-type template
parameters (a C++20 feature) which is available in GCC 9.3+. Thanks
[\@alexezeder (Alexey Ochapov) ](https://github.com/alexezeder ).
- Format string compilation now requires `format` functions of
`formatter` specializations for user-defined types to be `const` :
```c++
template < > struct fmt::formatter< my_type > : formatter< string_view > {
template < typename FormatContext >
auto format(my_type obj, FormatContext& ctx) const { // Note const here.
// ...
}
};
```
- Added UDL-based named argument support to format string compilation
([#2243](https://github.com/fmtlib/fmt/pull/2243),
[#2281 ](https://github.com/fmtlib/fmt/pull/2281 )). For example:
```c++
#include < fmt / compile . h >
using namespace fmt::literals;
auto s = fmt::format(FMT_COMPILE("{answer}"), "answer"_a = 42);
```
Here the argument named \"answer\" is resolved at compile time with
no runtime overhead. Thanks [\@alexezeder (Alexey
Ochapov)](https://github.com/alexezeder).
- Added format string compilation support to `fmt::print`
([#2280](https://github.com/fmtlib/fmt/issues/2280),
[#2304 ](https://github.com/fmtlib/fmt/pull/2304 )). Thanks
[\@alexezeder (Alexey Ochapov) ](https://github.com/alexezeder ).
- Added initial support for compiling {fmt} as a C++20 module
([#2235](https://github.com/fmtlib/fmt/pull/2235),
[#2240 ](https://github.com/fmtlib/fmt/pull/2240 ),
[#2260 ](https://github.com/fmtlib/fmt/pull/2260 ),
[#2282 ](https://github.com/fmtlib/fmt/pull/2282 ),
[#2283 ](https://github.com/fmtlib/fmt/pull/2283 ),
[#2288 ](https://github.com/fmtlib/fmt/pull/2288 ),
[#2298 ](https://github.com/fmtlib/fmt/pull/2298 ),
[#2306 ](https://github.com/fmtlib/fmt/pull/2306 ),
[#2307 ](https://github.com/fmtlib/fmt/pull/2307 ),
[#2309 ](https://github.com/fmtlib/fmt/pull/2309 ),
[#2318 ](https://github.com/fmtlib/fmt/pull/2318 ),
[#2324 ](https://github.com/fmtlib/fmt/pull/2324 ),
[#2332 ](https://github.com/fmtlib/fmt/pull/2332 ),
[#2340 ](https://github.com/fmtlib/fmt/pull/2340 )). Thanks
[\@DanielaE (Daniela Engert) ](https://github.com/DanielaE ).
- Made symbols private by default reducing shared library size
([#2301](https://github.com/fmtlib/fmt/pull/2301)). For example
there was a \~15% reported reduction on one platform. Thanks
[\@sergiud (Sergiu Deitsch) ](https://github.com/sergiud ).
- Optimized includes making the result of preprocessing `fmt/format.h`
\~20% smaller with libstdc++/C++20 and slightly improving build
times ([#1998](https://github.com/fmtlib/fmt/issues/1998)).
- Added support of ranges with non-const `begin` / `end`
([#1953](https://github.com/fmtlib/fmt/pull/1953)). Thanks [\@kitegi
(sarah)](https://github.com/kitegi).
- Added support of `std::byte` and other formattable types to
`fmt::join` ([#1981](https://github.com/fmtlib/fmt/issues/1981),
[#2040 ](https://github.com/fmtlib/fmt/issues/2040 ),
[#2050 ](https://github.com/fmtlib/fmt/pull/2050 ),
[#2262 ](https://github.com/fmtlib/fmt/issues/2262 )). For example:
```c++
#include < fmt / format . h >
#include < cstddef >
#include < vector >
int main() {
auto bytes = std::vector{std::byte(4), std::byte(2)};
fmt::print("{}", fmt::join(bytes, ""));
}
```
prints \"42\".
Thanks [\@kamibo (Camille Bordignon) ](https://github.com/kamibo ).
- Implemented the default format for `std::chrono::system_clock`
([#2319](https://github.com/fmtlib/fmt/issues/2319),
[#2345 ](https://github.com/fmtlib/fmt/pull/2345 )). For example:
```c++
#include < fmt / chrono . h >
int main() {
fmt::print("{}", std::chrono::system_clock::now());
}
```
prints \"2021-06-18 15:22:00\" (the output depends on the current
date and time). Thanks [\@sunmy2019 ](https://github.com/sunmy2019 ).
- Made more chrono specifiers locale independent by default. Use the
`'L'` specifier to get localized formatting. For example:
```c++
#include < fmt / chrono . h >
int main() {
std::locale::global(std::locale("ru_RU.UTF-8"));
auto monday = std::chrono::weekday(1);
fmt::print("{}\n", monday); // prints "Mon"
fmt::print("{:L}\n", monday); // prints "пн"
}
```
- Improved locale handling in chrono formatting
([#2337](https://github.com/fmtlib/fmt/issues/2337),
[#2349 ](https://github.com/fmtlib/fmt/pull/2349 ),
[#2350 ](https://github.com/fmtlib/fmt/pull/2350 )). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Deprecated `fmt/locale.h` moving the formatting functions that take
a locale to `fmt/format.h` (`char`) and `fmt/xchar` (other
overloads). This doesn\'t introduce a dependency on `<locale>` so
there is virtually no compile time effect.
- Deprecated an undocumented `format_to` overload that takes
`basic_memory_buffer` .
- Made parameter order in `vformat_to` consistent with `format_to`
([#2327](https://github.com/fmtlib/fmt/issues/2327)).
- Added support for time points with arbitrary durations
([#2208](https://github.com/fmtlib/fmt/issues/2208)). For example:
```c++
#include < fmt / chrono . h >
int main() {
using tp = std::chrono::time_point<
std::chrono::system_clock, std::chrono::seconds>;
fmt::print("{:%S}", tp(std::chrono::seconds(42)));
}
```
prints \"42\".
- Formatting floating-point numbers no longer produces trailing zeros
by default for consistency with `std::format` . For example:
```c++
#include < fmt / core . h >
int main() {
fmt::print("{0:.3}", 1.1);
}
```
prints \"1.1\". Use the `'#'` specifier to keep trailing zeros.
- Dropped a limit on the number of elements in a range and replaced
`{}` with `[]` as range delimiters for consistency with Python\'s
`str.format` .
- The `'L'` specifier for locale-specific numeric formatting can now
be combined with presentation specifiers as in `std::format` . For
example:
```c++
#include < fmt / core . h >
#include < locale >
int main() {
std::locale::global(std::locale("fr_FR.UTF-8"));
fmt::print("{0:.2Lf}", 0.42);
}
```
prints \"0,42\". The deprecated `'n'` specifier has been removed.
- Made the `0` specifier ignored for infinity and NaN
([#2305](https://github.com/fmtlib/fmt/issues/2305),
[#2310 ](https://github.com/fmtlib/fmt/pull/2310 )). Thanks [\@Liedtke
(Matthias Liedtke)](https://github.com/Liedtke).
- Made the hexfloat formatting use the right alignment by default
([#2308](https://github.com/fmtlib/fmt/issues/2308),
[#2317 ](https://github.com/fmtlib/fmt/pull/2317 )). Thanks [\@Liedtke
(Matthias Liedtke)](https://github.com/Liedtke).
- Removed the deprecated numeric alignment (`'='`). Use the `'0'`
specifier instead.
- Removed the deprecated `fmt/posix.h` header that has been replaced
with `fmt/os.h` .
- Removed the deprecated `format_to_n_context` , `format_to_n_args` and
`make_format_to_n_args` . They have been replaced with
`format_context` , `` format_args` and ``make_format_args\`\`
respectively.
- Moved `wchar_t` -specific functions and types to `fmt/xchar.h` . You
can define `FMT_DEPRECATED_INCLUDE_XCHAR` to automatically include
`fmt/xchar.h` from `fmt/format.h` but this will be disabled in the
next major release.
- Fixed handling of the `'+'` specifier in localized formatting
([#2133](https://github.com/fmtlib/fmt/issues/2133)).
- Added support for the `'s'` format specifier that gives textual
representation of `bool`
([#2094](https://github.com/fmtlib/fmt/issues/2094),
[#2109 ](https://github.com/fmtlib/fmt/pull/2109 )). For example:
```c++
#include < fmt / core . h >
int main() {
fmt::print("{:s}", true);
}
```
prints \"true\". Thanks [\@powercoderlol (Ivan
Polyakov)](https://github.com/powercoderlol).
- Made `fmt::ptr` work with function pointers
([#2131](https://github.com/fmtlib/fmt/pull/2131)). For example:
```c++
#include < fmt / format . h >
int main() {
fmt::print("My main: {}\n", fmt::ptr(main));
}
```
Thanks [\@mikecrowe (Mike Crowe) ](https://github.com/mikecrowe ).
- The undocumented support for specializing `formatter` for pointer
types has been removed.
- Fixed `fmt::formatted_size` with format string compilation
([#2141](https://github.com/fmtlib/fmt/pull/2141),
[#2161 ](https://github.com/fmtlib/fmt/pull/2161 )). Thanks
[\@alexezeder (Alexey Ochapov) ](https://github.com/alexezeder ).
- Fixed handling of empty format strings during format string
compilation ([#2042](https://github.com/fmtlib/fmt/issues/2042)):
```c++
auto s = fmt::format(FMT_COMPILE(""));
```
Thanks [\@alexezeder (Alexey
Ochapov)](https://github.com/alexezeder).
- Fixed handling of enums in `fmt::to_string`
([#2036](https://github.com/fmtlib/fmt/issues/2036)).
- Improved width computation
([#2033](https://github.com/fmtlib/fmt/issues/2033),
[#2091 ](https://github.com/fmtlib/fmt/issues/2091 )). For example:
```c++
#include < fmt / core . h >
int main() {
fmt::print("{:-< 10 }{} \n", " 你好 ", " 世界 ");
fmt::print("{:-< 10 }{} \n", " hello ", " world ");
}
```
prints
2023-09-04 14:59:30 +00:00
2023-09-04 14:07:24 +00:00
on a modern terminal.
- The experimental fast output stream (`fmt::ostream`) is now
truncated by default for consistency with `fopen`
([#2018](https://github.com/fmtlib/fmt/issues/2018)). For example:
```c++
#include < fmt / os . h >
int main() {
fmt::ostream out1 = fmt::output_file("guide");
out1.print("Zaphod");
out1.close();
fmt::ostream out2 = fmt::output_file("guide");
out2.print("Ford");
}
```
writes \"Ford\" to the file \"guide\". To preserve the old file
content if any pass `fmt::file::WRONLY | fmt::file::CREATE` flags to
`fmt::output_file` .
- Fixed moving of `fmt::ostream` that holds buffered data
([#2197](https://github.com/fmtlib/fmt/issues/2197),
[#2198 ](https://github.com/fmtlib/fmt/pull/2198 )). Thanks
[\@vtta ](https://github.com/vtta ).
- Replaced the `fmt::system_error` exception with a function of the
same name that constructs `std::system_error`
([#2266](https://github.com/fmtlib/fmt/issues/2266)).
- Replaced the `fmt::windows_error` exception with a function of the
same name that constructs `std::system_error` with the category
returned by `fmt::system_category()`
([#2274](https://github.com/fmtlib/fmt/issues/2274),
[#2275 ](https://github.com/fmtlib/fmt/pull/2275 )). The latter is
similar to `std::sytem_category` but correctly handles UTF-8. Thanks
[\@phprus (Vladislav Shchapov) ](https://github.com/phprus ).
- Replaced `fmt::error_code` with `std::error_code` and made it
formattable ([#2269](https://github.com/fmtlib/fmt/issues/2269),
[#2270 ](https://github.com/fmtlib/fmt/pull/2270 ),
[#2273 ](https://github.com/fmtlib/fmt/pull/2273 )). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Added speech synthesis support
([#2206](https://github.com/fmtlib/fmt/pull/2206)).
- Made `format_to` work with a memory buffer that has a custom
allocator ([#2300](https://github.com/fmtlib/fmt/pull/2300)). Thanks
[\@voxmea ](https://github.com/voxmea ).
- Added `Allocator::max_size` support to `basic_memory_buffer` .
([#1960](https://github.com/fmtlib/fmt/pull/1960)). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Added wide string support to `fmt::join`
([#2236](https://github.com/fmtlib/fmt/pull/2236)). Thanks
[\@crbrz ](https://github.com/crbrz ).
- Made iterators passed to `formatter` specializations via a format
context satisfy C++20 `std::output_iterator` requirements
([#2156](https://github.com/fmtlib/fmt/issues/2156),
[#2158 ](https://github.com/fmtlib/fmt/pull/2158 ),
[#2195 ](https://github.com/fmtlib/fmt/issues/2195 ),
[#2204 ](https://github.com/fmtlib/fmt/pull/2204 )). Thanks
[\@randomnetcat (Jason Cobb) ](https://github.com/randomnetcat ).
- Optimized the `printf` implementation
([#1982](https://github.com/fmtlib/fmt/pull/1982),
[#1984 ](https://github.com/fmtlib/fmt/pull/1984 ),
[#2016 ](https://github.com/fmtlib/fmt/pull/2016 ),
[#2164 ](https://github.com/fmtlib/fmt/pull/2164 )). Thanks
[\@rimathia ](https://github.com/rimathia ) and
[\@moiwi ](https://github.com/moiwi ).
- Improved detection of `constexpr` `char_traits`
([#2246](https://github.com/fmtlib/fmt/pull/2246),
[#2257 ](https://github.com/fmtlib/fmt/pull/2257 )). Thanks [\@phprus
(Vladislav Shchapov)](https://github.com/phprus).
- Fixed writing to `stdout` when it is redirected to `NUL` on Windows
([#2080](https://github.com/fmtlib/fmt/issues/2080)).
- Fixed exception propagation from iterators
([#2097](https://github.com/fmtlib/fmt/issues/2097)).
- Improved `strftime` error handling
([#2238](https://github.com/fmtlib/fmt/issues/2238),
[#2244 ](https://github.com/fmtlib/fmt/pull/2244 )). Thanks
[\@yumeyao ](https://github.com/yumeyao ).
- Stopped using deprecated GCC UDL template extension.
- Added `fmt/args.h` to the install target
([#2096](https://github.com/fmtlib/fmt/issues/2096)).
- Error messages are now passed to assert when exceptions are disabled
([#2145](https://github.com/fmtlib/fmt/pull/2145)). Thanks
[\@NobodyXu (Jiahao XU) ](https://github.com/NobodyXu ).
- Added the `FMT_MASTER_PROJECT` CMake option to control build and
install targets when {fmt} is included via `add_subdirectory`
([#2098](https://github.com/fmtlib/fmt/issues/2098),
[#2100 ](https://github.com/fmtlib/fmt/pull/2100 )). Thanks
[\@randomizedthinking ](https://github.com/randomizedthinking ).
- Improved build configuration
([#2026](https://github.com/fmtlib/fmt/pull/2026),
[#2122 ](https://github.com/fmtlib/fmt/pull/2122 )). Thanks
[\@luncliff (Park DongHa) ](https://github.com/luncliff ) and
[\@ibaned (Dan Ibanez) ](https://github.com/ibaned ).
- Fixed various warnings and compilation issues
([#1947](https://github.com/fmtlib/fmt/issues/1947),
[#1959 ](https://github.com/fmtlib/fmt/pull/1959 ),
[#1963 ](https://github.com/fmtlib/fmt/pull/1963 ),
[#1965 ](https://github.com/fmtlib/fmt/pull/1965 ),
[#1966 ](https://github.com/fmtlib/fmt/issues/1966 ),
[#1974 ](https://github.com/fmtlib/fmt/pull/1974 ),
[#1975 ](https://github.com/fmtlib/fmt/pull/1975 ),
[#1990 ](https://github.com/fmtlib/fmt/pull/1990 ),
[#2000 ](https://github.com/fmtlib/fmt/issues/2000 ),
[#2001 ](https://github.com/fmtlib/fmt/pull/2001 ),
[#2002 ](https://github.com/fmtlib/fmt/issues/2002 ),
[#2004 ](https://github.com/fmtlib/fmt/issues/2004 ),
[#2006 ](https://github.com/fmtlib/fmt/pull/2006 ),
[#2009 ](https://github.com/fmtlib/fmt/pull/2009 ),
[#2010 ](https://github.com/fmtlib/fmt/pull/2010 ),
[#2038 ](https://github.com/fmtlib/fmt/issues/2038 ),
[#2039 ](https://github.com/fmtlib/fmt/issues/2039 ),
[#2047 ](https://github.com/fmtlib/fmt/issues/2047 ),
[#2053 ](https://github.com/fmtlib/fmt/pull/2053 ),
[#2059 ](https://github.com/fmtlib/fmt/issues/2059 ),
[#2065 ](https://github.com/fmtlib/fmt/pull/2065 ),
[#2067 ](https://github.com/fmtlib/fmt/pull/2067 ),
[#2068 ](https://github.com/fmtlib/fmt/pull/2068 ),
[#2073 ](https://github.com/fmtlib/fmt/pull/2073 ),
[#2103 ](https://github.com/fmtlib/fmt/issues/2103 ),
[#2105 ](https://github.com/fmtlib/fmt/issues/2105 ),
[#2106 ](https://github.com/fmtlib/fmt/pull/2106 ),
[#2107 ](https://github.com/fmtlib/fmt/pull/2107 ),
[#2116 ](https://github.com/fmtlib/fmt/issues/2116 ),
[#2117 ](https://github.com/fmtlib/fmt/pull/2117 ),
[#2118 ](https://github.com/fmtlib/fmt/issues/2118 ),
[#2119 ](https://github.com/fmtlib/fmt/pull/2119 ),
[#2127 ](https://github.com/fmtlib/fmt/issues/2127 ),
[#2128 ](https://github.com/fmtlib/fmt/pull/2128 ),
[#2140 ](https://github.com/fmtlib/fmt/issues/2140 ),
[#2142 ](https://github.com/fmtlib/fmt/issues/2142 ),
[#2143 ](https://github.com/fmtlib/fmt/pull/2143 ),
[#2144 ](https://github.com/fmtlib/fmt/pull/2144 ),
[#2147 ](https://github.com/fmtlib/fmt/issues/2147 ),
[#2148 ](https://github.com/fmtlib/fmt/issues/2148 ),
[#2149 ](https://github.com/fmtlib/fmt/issues/2149 ),
[#2152 ](https://github.com/fmtlib/fmt/pull/2152 ),
[#2160 ](https://github.com/fmtlib/fmt/pull/2160 ),
[#2170 ](https://github.com/fmtlib/fmt/issues/2170 ),
[#2175 ](https://github.com/fmtlib/fmt/issues/2175 ),
[#2176 ](https://github.com/fmtlib/fmt/issues/2176 ),
[#2177 ](https://github.com/fmtlib/fmt/pull/2177 ),
[#2178 ](https://github.com/fmtlib/fmt/issues/2178 ),
[#2179 ](https://github.com/fmtlib/fmt/pull/2179 ),
[#2180 ](https://github.com/fmtlib/fmt/issues/2180 ),
[#2181 ](https://github.com/fmtlib/fmt/issues/2181 ),
[#2183 ](https://github.com/fmtlib/fmt/pull/2183 ),
[#2184 ](https://github.com/fmtlib/fmt/issues/2184 ),
[#2185 ](https://github.com/fmtlib/fmt/issues/2185 ),
[#2186 ](https://github.com/fmtlib/fmt/pull/2186 ),
[#2187 ](https://github.com/fmtlib/fmt/pull/2187 ),
[#2190 ](https://github.com/fmtlib/fmt/pull/2190 ),
[#2192 ](https://github.com/fmtlib/fmt/pull/2192 ),
[#2194 ](https://github.com/fmtlib/fmt/pull/2194 ),
[#2205 ](https://github.com/fmtlib/fmt/pull/2205 ),
[#2210 ](https://github.com/fmtlib/fmt/issues/2210 ),
[#2211 ](https://github.com/fmtlib/fmt/pull/2211 ),
[#2215 ](https://github.com/fmtlib/fmt/pull/2215 ),
[#2216 ](https://github.com/fmtlib/fmt/pull/2216 ),
[#2218 ](https://github.com/fmtlib/fmt/pull/2218 ),
[#2220 ](https://github.com/fmtlib/fmt/pull/2220 ),
[#2228 ](https://github.com/fmtlib/fmt/issues/2228 ),
[#2229 ](https://github.com/fmtlib/fmt/pull/2229 ),
[#2230 ](https://github.com/fmtlib/fmt/pull/2230 ),
[#2233 ](https://github.com/fmtlib/fmt/issues/2233 ),
[#2239 ](https://github.com/fmtlib/fmt/pull/2239 ),
[#2248 ](https://github.com/fmtlib/fmt/issues/2248 ),
[#2252 ](https://github.com/fmtlib/fmt/issues/2252 ),
[#2253 ](https://github.com/fmtlib/fmt/pull/2253 ),
[#2255 ](https://github.com/fmtlib/fmt/pull/2255 ),
[#2261 ](https://github.com/fmtlib/fmt/issues/2261 ),
[#2278 ](https://github.com/fmtlib/fmt/issues/2278 ),
[#2284 ](https://github.com/fmtlib/fmt/issues/2284 ),
[#2287 ](https://github.com/fmtlib/fmt/pull/2287 ),
[#2289 ](https://github.com/fmtlib/fmt/pull/2289 ),
[#2290 ](https://github.com/fmtlib/fmt/pull/2290 ),
[#2293 ](https://github.com/fmtlib/fmt/pull/2293 ),
[#2295 ](https://github.com/fmtlib/fmt/issues/2295 ),
[#2296 ](https://github.com/fmtlib/fmt/pull/2296 ),
[#2297 ](https://github.com/fmtlib/fmt/pull/2297 ),
[#2311 ](https://github.com/fmtlib/fmt/issues/2311 ),
[#2313 ](https://github.com/fmtlib/fmt/pull/2313 ),
[#2315 ](https://github.com/fmtlib/fmt/pull/2315 ),
[#2320 ](https://github.com/fmtlib/fmt/issues/2320 ),
[#2321 ](https://github.com/fmtlib/fmt/pull/2321 ),
[#2323 ](https://github.com/fmtlib/fmt/pull/2323 ),
[#2328 ](https://github.com/fmtlib/fmt/issues/2328 ),
[#2329 ](https://github.com/fmtlib/fmt/pull/2329 ),
[#2333 ](https://github.com/fmtlib/fmt/pull/2333 ),
[#2338 ](https://github.com/fmtlib/fmt/pull/2338 ),
[#2341 ](https://github.com/fmtlib/fmt/pull/2341 )). Thanks
[\@darklukee ](https://github.com/darklukee ), [\@fagg (Ashton
Fagg)](https://github.com/fagg), [\@killerbot242 (Lieven de
Cock)](https://github.com/killerbot242), [\@jgopel (Jonathan
Gopel)](https://github.com/jgopel), [\@yeswalrus (Walter
Gray)](https://github.com/yeswalrus),
[\@Finkman ](https://github.com/Finkman ), [\@HazardyKnusperkeks
(Björn Schäpers)](https://github.com/HazardyKnusperkeks),
[\@dkavolis (Daumantas Kavolis) ](https://github.com/dkavolis ),
[\@concatime (Issam Maghni) ](https://github.com/concatime ),
[\@chronoxor (Ivan Shynkarenka) ](https://github.com/chronoxor ),
[\@summivox (Yin Zhong) ](https://github.com/summivox ),
[\@yNeo ](https://github.com/yNeo ), [\@Apache-HB
(Elliot)](https://github.com/Apache-HB), [\@alexezeder (Alexey
Ochapov)](https://github.com/alexezeder), [\@toojays (John Steele
Scott)](https://github.com/toojays),
[\@Brainy0207 ](https://github.com/Brainy0207 ), [\@vadz
(VZ)](https://github.com/vadz), [\@imsherlock (Ryan
Sherlock)](https://github.com/imsherlock), [\@phprus (Vladislav
Shchapov)](https://github.com/phprus), [\@white238 (Chris
White)](https://github.com/white238), [\@yafshar (Yaser
Afshar)](https://github.com/yafshar), [\@BillyDonahue (Billy
Donahue)](https://github.com/BillyDonahue),
[\@jstaahl ](https://github.com/jstaahl ),
[\@denchat ](https://github.com/denchat ), [\@DanielaE (Daniela
Engert)](https://github.com/DanielaE), [\@ilyakurdyukov (Ilya
Kurdyukov)](https://github.com/ilyakurdyukov),
[\@ilmai ](https://github.com/ilmai ), [\@JessyDL (Jessy De
Lannoit)](https://github.com/JessyDL), [\@sergiud (Sergiu
Deitsch)](https://github.com/sergiud),
[\@mwinterb ](https://github.com/mwinterb ),
[\@sven-herrmann ](https://github.com/sven-herrmann ), [\@jmelas (John
Melas)](https://github.com/jmelas), [\@twoixter (Jose Miguel
Pérez)](https://github.com/twoixter),
[\@crbrz ](https://github.com/crbrz ), [\@upsj (Tobias
Ribizel)](https://github.com/upsj).
- Improved documentation
([#1986](https://github.com/fmtlib/fmt/issues/1986),
[#2051 ](https://github.com/fmtlib/fmt/pull/2051 ),
[#2057 ](https://github.com/fmtlib/fmt/issues/2057 ),
[#2081 ](https://github.com/fmtlib/fmt/pull/2081 ),
[#2084 ](https://github.com/fmtlib/fmt/issues/2084 ),
[#2312 ](https://github.com/fmtlib/fmt/pull/2312 )). Thanks
[\@imba-tjd (谭九鼎) ](https://github.com/imba-tjd ), [\@0x416c69
(Alι ѕ ѕ ѕ ѕ ι
[\@mordante ](https://github.com/mordante ).
- Continuous integration and test improvements
([#1969](https://github.com/fmtlib/fmt/issues/1969),
[#1991 ](https://github.com/fmtlib/fmt/pull/1991 ),
[#2020 ](https://github.com/fmtlib/fmt/pull/2020 ),
[#2110 ](https://github.com/fmtlib/fmt/pull/2110 ),
[#2114 ](https://github.com/fmtlib/fmt/pull/2114 ),
[#2196 ](https://github.com/fmtlib/fmt/issues/2196 ),
[#2217 ](https://github.com/fmtlib/fmt/pull/2217 ),
[#2247 ](https://github.com/fmtlib/fmt/pull/2247 ),
[#2256 ](https://github.com/fmtlib/fmt/pull/2256 ),
[#2336 ](https://github.com/fmtlib/fmt/pull/2336 ),
[#2346 ](https://github.com/fmtlib/fmt/pull/2346 )). Thanks [\@jgopel
(Jonathan Gopel)](https://github.com/jgopel), [\@alexezeder (Alexey
Ochapov)](https://github.com/alexezeder) and [\@DanielaE (Daniela
Engert)](https://github.com/DanielaE).
# 7.1.3 - 2020-11-24
- Fixed handling of buffer boundaries in `format_to_n`
([#1996](https://github.com/fmtlib/fmt/issues/1996),
[#2029 ](https://github.com/fmtlib/fmt/issues/2029 )).
- Fixed linkage errors when linking with a shared library
([#2011](https://github.com/fmtlib/fmt/issues/2011)).
- Reintroduced ostream support to range formatters
([#2014](https://github.com/fmtlib/fmt/issues/2014)).
- Worked around an issue with mixing std versions in gcc
([#2017](https://github.com/fmtlib/fmt/issues/2017)).
# 7.1.2 - 2020-11-04
- Fixed floating point formatting with large precision
([#1976](https://github.com/fmtlib/fmt/issues/1976)).
# 7.1.1 - 2020-11-01
- Fixed ABI compatibility with 7.0.x
([#1961](https://github.com/fmtlib/fmt/issues/1961)).
- Added the `FMT_ARM_ABI_COMPATIBILITY` macro to work around ABI
incompatibility between GCC and Clang on ARM
([#1919](https://github.com/fmtlib/fmt/issues/1919)).
- Worked around a SFINAE bug in GCC 8
([#1957](https://github.com/fmtlib/fmt/issues/1957)).
- Fixed linkage errors when building with GCC\'s LTO
([#1955](https://github.com/fmtlib/fmt/issues/1955)).
- Fixed a compilation error when building without `__builtin_clz` or
equivalent ([#1968](https://github.com/fmtlib/fmt/pull/1968)).
Thanks [\@tohammer (Tobias Hammer) ](https://github.com/tohammer ).
- Fixed a sign conversion warning
([#1964](https://github.com/fmtlib/fmt/pull/1964)). Thanks
[\@OptoCloud ](https://github.com/OptoCloud ).
# 7.1.0 - 2020-10-25
- Switched from
[Grisu3 ](https://www.cs.tufts.edu/~nr/cs257/archive/florian-loitsch/printf.pdf )
to [Dragonbox ](https://github.com/jk-jeon/dragonbox ) for the default
floating-point formatting which gives the shortest decimal
representation with round-trip guarantee and correct rounding
([#1882](https://github.com/fmtlib/fmt/pull/1882),
[#1887 ](https://github.com/fmtlib/fmt/pull/1887 ),
[#1894 ](https://github.com/fmtlib/fmt/pull/1894 )). This makes {fmt}
up to 20-30x faster than common implementations of
`std::ostringstream` and `sprintf` on
[dtoa-benchmark ](https://github.com/fmtlib/dtoa-benchmark ) and
faster than double-conversion and Ryū:
2023-09-04 14:59:30 +00:00
2023-09-04 14:07:24 +00:00
It is possible to get even better performance at the cost of larger
binary size by compiling with the `FMT_USE_FULL_CACHE_DRAGONBOX`
macro set to 1.
Thanks [\@jk-jeon (Junekey Jeon) ](https://github.com/jk-jeon ).
- Added an experimental unsynchronized file output API which, together
with [format string
compilation](https://fmt.dev/latest/api.html#compile-api), can give
[5-9 times speed up compared to
fprintf](https://www.zverovich.net/2020/08/04/optimal-file-buffer-size.html)
on common platforms ([godbolt](https://godbolt.org/z/nsTcG8)):
```c++
#include < fmt / os . h >
int main() {
auto f = fmt::output_file("guide");
f.print("The answer is {}.", 42);
}
```
- Added a formatter for `std::chrono::time_point<system_clock>`
([#1819](https://github.com/fmtlib/fmt/issues/1819),
[#1837 ](https://github.com/fmtlib/fmt/pull/1837 )). For example
([godbolt](https://godbolt.org/z/c4M6fh)):
```c++
#include < fmt / chrono . h >
int main() {
auto now = std::chrono::system_clock::now();
fmt::print("The time is {:%H:%M:%S}.\n", now);
}
```
Thanks [\@adamburgess (Adam
Burgess)](https://github.com/adamburgess).
- Added support for ranges with non-const `begin` /`end` to `fmt::join`
([#1784](https://github.com/fmtlib/fmt/issues/1784),
[#1786 ](https://github.com/fmtlib/fmt/pull/1786 )). For example
([godbolt](https://godbolt.org/z/jP63Tv)):
```c++
#include < fmt / ranges . h >
#include < range / v3 / view / filter . hpp >
int main() {
using std::literals::string_literals::operator""s;
auto strs = std::array{"a"s, "bb"s, "ccc"s};
auto range = strs | ranges::views::filter(
[] (const std::string & x) { return x.size() != 2; }
);
fmt::print("{}\n", fmt::join(range, ""));
}
```
prints \"accc\".
Thanks [\@tonyelewis (Tony E Lewis) ](https://github.com/tonyelewis ).
- Added a `memory_buffer::append` overload that takes a range
([#1806](https://github.com/fmtlib/fmt/pull/1806)). Thanks
[\@BRevzin (Barry Revzin) ](https://github.com/BRevzin ).
- Improved handling of single code units in `FMT_COMPILE` . For
example:
```c++
#include < fmt / compile . h >
char* f(char* buf) {
return fmt::format_to(buf, FMT_COMPILE("x{}"), 42);
}
```
compiles to just ([godbolt](https://godbolt.org/z/5vncz3)):
```asm
_Z1fPc:
movb $120, (%rdi)
xorl %edx, %edx
cmpl $42, _ZN3fmt2v76detail10basic_dataIvE23zero_or_powers_of_10_32E+8(%rip)
movl $3, %eax
seta %dl
subl %edx, %eax
movzwl _ZN3fmt2v76detail10basic_dataIvE6digitsE+84(%rip), %edx
cltq
addq %rdi, %rax
movw %dx, -2(%rax)
ret
```
Here a single `mov` instruction writes `'x'` (`$120`) to the output
buffer.
- Added dynamic width support to format string compilation
([#1809](https://github.com/fmtlib/fmt/issues/1809)).
- Improved error reporting for unformattable types: now you\'ll get
the type name directly in the error message instead of the note:
```c++
#include < fmt / core . h >
struct how_about_no {};
int main() {
fmt::print("{}", how_about_no());
}
```
Error ([godbolt](https://godbolt.org/z/GoxM4e)):
`fmt/core.h:1438:3: error: static_assert failed due to requirement 'fmt::v7::formattable<how_about_no>()' "Cannot format an argument. To make type T formattable provide a formatter<T> specialization: https://fmt.dev/latest/api.html#udt" ...`
- Added the
[make_args_checked ](https://fmt.dev/7.1.0/api.html#argument-lists )
function template that allows you to write formatting functions with
compile-time format string checks and avoid binary code bloat
([godbolt](https://godbolt.org/z/PEf9qr)):
```c++
void vlog(const char* file, int line, fmt::string_view format,
fmt::format_args args) {
fmt::print("{}: {}: ", file, line);
fmt::vprint(format, args);
}
template < typename S , typename . . . Args >
void log(const char* file, int line, const S& format, Args& & ... args) {
vlog(file, line, format,
fmt::make_args_checked< Args... > (format, args...));
}
#define MY_LOG(format, ...) \
log(__FILE__, __LINE__ , FMT_STRING(format), __VA_ARGS__ )
MY_LOG("invalid squishiness: {}", 42);
```
- Replaced `snprintf` fallback with a faster internal IEEE 754 `float`
and `double` formatter for arbitrary precision. For example
([godbolt](https://godbolt.org/z/dPhWvj)):
```c++
#include < fmt / core . h >
int main() {
fmt::print("{:.500}\n", 4.9406564584124654E-324);
}
```
prints
`4.9406564584124654417656879286822137236505980261432476442558568250067550727020875186529983636163599237979656469544571773092665671035593979639877479601078187812630071319031140452784581716784898210368871863605699873072305000638740915356498438731247339727316961514003171538539807412623856559117102665855668676818703956031062493194527159149245532930545654440112748012970999954193198940908041656332452475714786901472678015935523861155013480352649347201937902681071074917033322268447533357208324319360923829e-324` .
- Made `format_to_n` and `formatted_size` part of the [core
API](https://fmt.dev/latest/api.html#core-api)
([godbolt](https://godbolt.org/z/sPjY1K)):
```c++
#include < fmt / core . h >
int main() {
char buffer[10];
auto result = fmt::format_to_n(buffer, sizeof(buffer), "{}", 42);
}
```
- Added `fmt::format_to_n` overload with format string compilation
([#1764](https://github.com/fmtlib/fmt/issues/1764),
[#1767 ](https://github.com/fmtlib/fmt/pull/1767 ),
[#1869 ](https://github.com/fmtlib/fmt/pull/1869 )). For example
([godbolt](https://godbolt.org/z/93h86q)):
```c++
#include < fmt / compile . h >
int main() {
char buffer[8];
fmt::format_to_n(buffer, sizeof(buffer), FMT_COMPILE("{}"), 42);
}
```
Thanks [\@Kurkin (Dmitry Kurkin) ](https://github.com/Kurkin ),
[\@alexezeder (Alexey Ochapov) ](https://github.com/alexezeder ).
- Added `fmt::format_to` overload that take `text_style`
([#1593](https://github.com/fmtlib/fmt/issues/1593),
[#1842 ](https://github.com/fmtlib/fmt/issues/1842 ),
[#1843 ](https://github.com/fmtlib/fmt/pull/1843 )). For example
([godbolt](https://godbolt.org/z/91153r)):
```c++
#include < fmt / color . h >
int main() {
std::string out;
fmt::format_to(std::back_inserter(out),
fmt::emphasis::bold | fg(fmt::color::red),
"The answer is {}.", 42);
}
```
Thanks [\@Naios (Denis Blank) ](https://github.com/Naios ).
- Made the `'#'` specifier emit trailing zeros in addition to the
decimal point ([#1797](https://github.com/fmtlib/fmt/issues/1797)).
For example ([godbolt](https://godbolt.org/z/bhdcW9)):
```c++
#include < fmt / core . h >
int main() {
fmt::print("{:#.2g}", 0.5);
}
```
prints `0.50` .
- Changed the default floating point format to not include `.0` for
consistency with `std::format` and `std::to_chars`
([#1893](https://github.com/fmtlib/fmt/issues/1893),
[#1943 ](https://github.com/fmtlib/fmt/issues/1943 )). It is possible
to get the decimal point and trailing zero with the `#` specifier.
- Fixed an issue with floating-point formatting that could result in
addition of a non-significant trailing zero in rare cases e.g.
`1.00e-34` instead of `1.0e-34`
([#1873](https://github.com/fmtlib/fmt/issues/1873),
[#1917 ](https://github.com/fmtlib/fmt/issues/1917 )).
- Made `fmt::to_string` fallback on `ostream` insertion operator if
the `formatter` specialization is not provided
([#1815](https://github.com/fmtlib/fmt/issues/1815),
[#1829 ](https://github.com/fmtlib/fmt/pull/1829 )). Thanks
[\@alexezeder (Alexey Ochapov) ](https://github.com/alexezeder ).
- Added support for the append mode to the experimental file API and
improved `fcntl.h` detection.
([#1847](https://github.com/fmtlib/fmt/pull/1847),
[#1848 ](https://github.com/fmtlib/fmt/pull/1848 )). Thanks
[\@t-wiser ](https://github.com/t-wiser ).
- Fixed handling of types that have both an implicit conversion
operator and an overloaded `ostream` insertion operator
([#1766](https://github.com/fmtlib/fmt/issues/1766)).
- Fixed a slicing issue in an internal iterator type
([#1822](https://github.com/fmtlib/fmt/pull/1822)). Thanks
[\@BRevzin (Barry Revzin) ](https://github.com/BRevzin ).
- Fixed an issue in locale-specific integer formatting
([#1927](https://github.com/fmtlib/fmt/issues/1927)).
- Fixed handling of exotic code unit types
([#1870](https://github.com/fmtlib/fmt/issues/1870),
[#1932 ](https://github.com/fmtlib/fmt/issues/1932 )).
- Improved `FMT_ALWAYS_INLINE`
([#1878](https://github.com/fmtlib/fmt/pull/1878)). Thanks
[\@jk-jeon (Junekey Jeon) ](https://github.com/jk-jeon ).
- Removed dependency on `windows.h`
([#1900](https://github.com/fmtlib/fmt/pull/1900)). Thanks [\@bernd5
(Bernd Baumanns)](https://github.com/bernd5).
- Optimized counting of decimal digits on MSVC
([#1890](https://github.com/fmtlib/fmt/pull/1890)). Thanks
[\@mwinterb ](https://github.com/mwinterb ).
- Improved documentation
([#1772](https://github.com/fmtlib/fmt/issues/1772),
[#1775 ](https://github.com/fmtlib/fmt/pull/1775 ),
[#1792 ](https://github.com/fmtlib/fmt/pull/1792 ),
[#1838 ](https://github.com/fmtlib/fmt/pull/1838 ),
[#1888 ](https://github.com/fmtlib/fmt/pull/1888 ),
[#1918 ](https://github.com/fmtlib/fmt/pull/1918 ),
[#1939 ](https://github.com/fmtlib/fmt/pull/1939 )). Thanks
[\@leolchat (Léonard Gérard) ](https://github.com/leolchat ),
[\@pepsiman (Malcolm Parsons) ](https://github.com/pepsiman ),
[\@Klaim (Joël Lamotte) ](https://github.com/Klaim ), [\@ravijanjam
(Ravi J)](https://github.com/ravijanjam),
[\@francesco-st ](https://github.com/francesco-st ), [\@udnaan
(Adnan)](https://github.com/udnaan).
- Added the `FMT_REDUCE_INT_INSTANTIATIONS` CMake option that reduces
the binary code size at the cost of some integer formatting
performance. This can be useful for extremely memory-constrained
embedded systems
([#1778](https://github.com/fmtlib/fmt/issues/1778),
[#1781 ](https://github.com/fmtlib/fmt/pull/1781 )). Thanks [\@kammce
(Khalil Estell)](https://github.com/kammce).
- Added the `FMT_USE_INLINE_NAMESPACES` macro to control usage of
inline namespaces
([#1945](https://github.com/fmtlib/fmt/pull/1945)). Thanks
[\@darklukee ](https://github.com/darklukee ).
- Improved build configuration
([#1760](https://github.com/fmtlib/fmt/pull/1760),
[#1770 ](https://github.com/fmtlib/fmt/pull/1770 ),
[#1779 ](https://github.com/fmtlib/fmt/issues/1779 ),
[#1783 ](https://github.com/fmtlib/fmt/pull/1783 ),
[#1823 ](https://github.com/fmtlib/fmt/pull/1823 )). Thanks
[\@dvetutnev (Dmitriy Vetutnev) ](https://github.com/dvetutnev ),
[\@xvitaly (Vitaly Zaitsev) ](https://github.com/xvitaly ), [\@tambry
(Raul Tambre)](https://github.com/tambry),
[\@medithe ](https://github.com/medithe ), [\@martinwuehrer (Martin
Wührer)](https://github.com/martinwuehrer).
- Fixed various warnings and compilation issues
([#1790](https://github.com/fmtlib/fmt/pull/1790),
[#1802 ](https://github.com/fmtlib/fmt/pull/1802 ),
[#1808 ](https://github.com/fmtlib/fmt/pull/1808 ),
[#1810 ](https://github.com/fmtlib/fmt/issues/1810 ),
[#1811 ](https://github.com/fmtlib/fmt/issues/1811 ),
[#1812 ](https://github.com/fmtlib/fmt/pull/1812 ),
[#1814 ](https://github.com/fmtlib/fmt/pull/1814 ),
[#1816 ](https://github.com/fmtlib/fmt/pull/1816 ),
[#1817 ](https://github.com/fmtlib/fmt/pull/1817 ),
[#1818 ](https://github.com/fmtlib/fmt/pull/1818 ),
[#1825 ](https://github.com/fmtlib/fmt/issues/1825 ),
[#1836 ](https://github.com/fmtlib/fmt/pull/1836 ),
[#1855 ](https://github.com/fmtlib/fmt/pull/1855 ),
[#1856 ](https://github.com/fmtlib/fmt/pull/1856 ),
[#1860 ](https://github.com/fmtlib/fmt/pull/1860 ),
[#1877 ](https://github.com/fmtlib/fmt/pull/1877 ),
[#1879 ](https://github.com/fmtlib/fmt/pull/1879 ),
[#1880 ](https://github.com/fmtlib/fmt/pull/1880 ),
[#1896 ](https://github.com/fmtlib/fmt/issues/1896 ),
[#1897 ](https://github.com/fmtlib/fmt/pull/1897 ),
[#1898 ](https://github.com/fmtlib/fmt/pull/1898 ),
[#1904 ](https://github.com/fmtlib/fmt/issues/1904 ),
[#1908 ](https://github.com/fmtlib/fmt/pull/1908 ),
[#1911 ](https://github.com/fmtlib/fmt/issues/1911 ),
[#1912 ](https://github.com/fmtlib/fmt/issues/1912 ),
[#1928 ](https://github.com/fmtlib/fmt/issues/1928 ),
[#1929 ](https://github.com/fmtlib/fmt/pull/1929 ),
[#1935 ](https://github.com/fmtlib/fmt/issues/1935 ),
[#1937 ](https://github.com/fmtlib/fmt/pull/1937 ),
[#1942 ](https://github.com/fmtlib/fmt/pull/1942 ),
[#1949 ](https://github.com/fmtlib/fmt/issues/1949 )). Thanks
[\@TheQwertiest ](https://github.com/TheQwertiest ),
[\@medithe ](https://github.com/medithe ), [\@martinwuehrer (Martin
Wührer)](https://github.com/martinwuehrer),
[\@n16h7hunt3r ](https://github.com/n16h7hunt3r ), [\@Othereum
(Seokjin Lee)](https://github.com/Othereum), [\@gsjaardema (Greg
Sjaardema)](https://github.com/gsjaardema), [\@AlexanderLanin
(Alexander Lanin)](https://github.com/AlexanderLanin), [\@gcerretani
(Giovanni Cerretani)](https://github.com/gcerretani), [\@chronoxor
(Ivan Shynkarenka)](https://github.com/chronoxor), [\@noizefloor
(Jan Schwers)](https://github.com/noizefloor), [\@akohlmey (Axel
Kohlmeyer)](https://github.com/akohlmey), [\@jk-jeon (Junekey
Jeon)](https://github.com/jk-jeon),
[\@rimathia ](https://github.com/rimathia ), [\@rglarix (Riccardo
Ghetta (larix))](https://github.com/rglarix),
[\@moiwi ](https://github.com/moiwi ), [\@heckad (Kazantcev
Andrey)](https://github.com/heckad),
[\@MarcDirven ](https://github.com/MarcDirven ). [\@BartSiwek (Bart
Siwek)](https://github.com/BartSiwek),
[\@darklukee ](https://github.com/darklukee ).
# 7.0.3 - 2020-08-06
- Worked around broken `numeric_limits` for 128-bit integers
([#1787](https://github.com/fmtlib/fmt/issues/1787)).
- Added error reporting on missing named arguments
([#1796](https://github.com/fmtlib/fmt/issues/1796)).
- Stopped using 128-bit integers with clang-cl
([#1800](https://github.com/fmtlib/fmt/pull/1800)). Thanks
[\@Kingcom ](https://github.com/Kingcom ).
- Fixed issues in locale-specific integer formatting
([#1782](https://github.com/fmtlib/fmt/issues/1782),
[#1801 ](https://github.com/fmtlib/fmt/issues/1801 )).
# 7.0.2 - 2020-07-29
- Worked around broken `numeric_limits` for 128-bit integers
([#1725](https://github.com/fmtlib/fmt/issues/1725)).
- Fixed compatibility with CMake 3.4
([#1779](https://github.com/fmtlib/fmt/issues/1779)).
- Fixed handling of digit separators in locale-specific formatting
([#1782](https://github.com/fmtlib/fmt/issues/1782)).
# 7.0.1 - 2020-07-07
- Updated the inline version namespace name.
- Worked around a gcc bug in mangling of alias templates
([#1753](https://github.com/fmtlib/fmt/issues/1753)).
- Fixed a linkage error on Windows
([#1757](https://github.com/fmtlib/fmt/issues/1757)). Thanks
[\@Kurkin (Dmitry Kurkin) ](https://github.com/Kurkin ).
- Fixed minor issues with the documentation.
# 7.0.0 - 2020-07-05
- Reduced the library size. For example, on macOS a stripped test
binary statically linked with {fmt} [shrank from \~368k to less than
100k](http://www.zverovich.net/2020/05/21/reducing-library-size.html).
- Added a simpler and more efficient [format string compilation
API](https://fmt.dev/7.0.0/api.html#compile-api):
```c++
#include < fmt / compile . h >
// Converts 42 into std::string using the most efficient method and no
// runtime format string processing.
std::string s = fmt::format(FMT_COMPILE("{}"), 42);
```
The old `fmt::compile` API is now deprecated.
- Optimized integer formatting: `format_to` with format string
compilation and a stack-allocated buffer is now [faster than
to_chars on both libc++ and
libstdc++](http://www.zverovich.net/2020/06/13/fast-int-to-string-revisited.html).
- Optimized handling of small format strings. For example,
```c++
fmt::format("Result: {}: ({},{},{},{})", str1, str2, str3, str4, str5)
```
is now \~40% faster
([#1685](https://github.com/fmtlib/fmt/issues/1685)).
- Applied extern templates to improve compile times when using the
core API and `fmt/format.h`
([#1452](https://github.com/fmtlib/fmt/issues/1452)). For example,
on macOS with clang the compile time of a test translation unit
dropped from 2.3s to 0.3s with `-O2` and from 0.6s to 0.3s with the
default settings (`-O0`).
Before (`-O2`):
% time c++ -c test.cc -I include -std=c++17 -O2
c++ -c test.cc -I include -std=c++17 -O2 2.22s user 0.08s system 99% cpu 2.311 total
After (`-O2`):
% time c++ -c test.cc -I include -std=c++17 -O2
c++ -c test.cc -I include -std=c++17 -O2 0.26s user 0.04s system 98% cpu 0.303 total
Before (default):
% time c++ -c test.cc -I include -std=c++17
c++ -c test.cc -I include -std=c++17 0.53s user 0.06s system 98% cpu 0.601 total
After (default):
% time c++ -c test.cc -I include -std=c++17
c++ -c test.cc -I include -std=c++17 0.24s user 0.06s system 98% cpu 0.301 total
It is still recommended to use `fmt/core.h` instead of
`fmt/format.h` but the compile time difference is now smaller.
Thanks [\@alex3d ](https://github.com/alex3d ) for the suggestion.
- Named arguments are now stored on stack (no dynamic memory
allocations) and the compiled code is more compact and efficient.
For example
```c++
#include < fmt / core . h >
int main() {
fmt::print("The answer is {answer}\n", fmt::arg("answer", 42));
}
```
compiles to just ([godbolt](https://godbolt.org/z/NcfEp_))
```asm
.LC0:
.string "answer"
.LC1:
.string "The answer is {answer}\n"
main:
sub rsp, 56
mov edi, OFFSET FLAT:.LC1
mov esi, 23
movabs rdx, 4611686018427387905
lea rax, [rsp+32]
lea rcx, [rsp+16]
mov QWORD PTR [rsp+8], 1
mov QWORD PTR [rsp], rax
mov DWORD PTR [rsp+16], 42
mov QWORD PTR [rsp+32], OFFSET FLAT:.LC0
mov DWORD PTR [rsp+40], 0
call fmt::v6::vprint(fmt::v6::basic_string_view< char > ,
fmt::v6::format_args)
xor eax, eax
add rsp, 56
ret
.L.str.1:
.asciz "answer"
```
- Implemented compile-time checks for dynamic width and precision
([#1614](https://github.com/fmtlib/fmt/issues/1614)):
```c++
#include < fmt / format . h >
int main() {
fmt::print(FMT_STRING("{0:{1}}"), 42);
}
```
now gives a compilation error because argument 1 doesn\'t exist:
In file included from test.cc:1:
include/fmt/format.h:2726:27: error: constexpr variable 'invalid_format' must be
initialized by a constant expression
FMT_CONSTEXPR_DECL bool invalid_format =
^
...
include/fmt/core.h:569:26: note: in call to
'& checker(s, {}).context_->on_error(& "argument not found"[0])'
if (id >= num_args_) on_error("argument not found");
^
- Added sentinel support to `fmt::join`
([#1689](https://github.com/fmtlib/fmt/pull/1689))
```c++
struct zstring_sentinel {};
bool operator==(const char* p, zstring_sentinel) { return *p == '\0'; }
bool operator!=(const char* p, zstring_sentinel) { return *p != '\0'; }
struct zstring {
const char* p;
const char* begin() const { return p; }
zstring_sentinel end() const { return {}; }
};
auto s = fmt::format("{}", fmt::join(zstring{"hello"}, "_"));
// s == "h_e_l_l_o"
```
Thanks [\@BRevzin (Barry Revzin) ](https://github.com/BRevzin ).
- Added support for named arguments, `clear` and `reserve` to
`dynamic_format_arg_store`
([#1655](https://github.com/fmtlib/fmt/issues/1655),
[#1663 ](https://github.com/fmtlib/fmt/pull/1663 ),
[#1674 ](https://github.com/fmtlib/fmt/pull/1674 ),
[#1677 ](https://github.com/fmtlib/fmt/pull/1677 )). Thanks
[\@vsolontsov-ll (Vladimir
Solontsov)](https://github.com/vsolontsov-ll).
- Added support for the `'c'` format specifier to integral types for
compatibility with `std::format`
([#1652](https://github.com/fmtlib/fmt/issues/1652)).
- Replaced the `'n'` format specifier with `'L'` for compatibility
with `std::format`
([#1624](https://github.com/fmtlib/fmt/issues/1624)). The `'n'`
specifier can be enabled via the `FMT_DEPRECATED_N_SPECIFIER` macro.
- The `'='` format specifier is now disabled by default for
compatibility with `std::format` . It can be enabled via the
`FMT_DEPRECATED_NUMERIC_ALIGN` macro.
- Removed the following deprecated APIs:
- `FMT_STRING_ALIAS` and `fmt` macros - replaced by `FMT_STRING`
- `fmt::basic_string_view::char_type` - replaced by
`fmt::basic_string_view::value_type`
- `convert_to_int`
- `format_arg_store::types`
- `*parse_context` - replaced by `*format_parse_context`
- `FMT_DEPRECATED_INCLUDE_OS`
- `FMT_DEPRECATED_PERCENT` - incompatible with `std::format`
- `*writer` - replaced by compiled format API
- Renamed the `internal` namespace to `detail`
([#1538](https://github.com/fmtlib/fmt/issues/1538)). The former is
still provided as an alias if the `FMT_USE_INTERNAL` macro is
defined.
- Improved compatibility between `fmt::printf` with the standard specs
([#1595](https://github.com/fmtlib/fmt/issues/1595),
[#1682 ](https://github.com/fmtlib/fmt/pull/1682 ),
[#1683 ](https://github.com/fmtlib/fmt/pull/1683 ),
[#1687 ](https://github.com/fmtlib/fmt/pull/1687 ),
[#1699 ](https://github.com/fmtlib/fmt/pull/1699 )). Thanks
[\@rimathia ](https://github.com/rimathia ).
- Fixed handling of `operator<<` overloads that use `copyfmt`
([#1666](https://github.com/fmtlib/fmt/issues/1666)).
- Added the `FMT_OS` CMake option to control inclusion of OS-specific
APIs in the fmt target. This can be useful for embedded platforms
([#1654](https://github.com/fmtlib/fmt/issues/1654),
[#1656 ](https://github.com/fmtlib/fmt/pull/1656 )). Thanks
[\@kwesolowski (Krzysztof
Wesolowski)](https://github.com/kwesolowski).
- Replaced `FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION` with the
`FMT_FUZZ` macro to prevent interfering with fuzzing of projects
using {fmt} ([#1650](https://github.com/fmtlib/fmt/pull/1650)).
Thanks [\@asraa (Asra Ali) ](https://github.com/asraa ).
- Fixed compatibility with emscripten
([#1636](https://github.com/fmtlib/fmt/issues/1636),
[#1637 ](https://github.com/fmtlib/fmt/pull/1637 )). Thanks
[\@ArthurSonzogni (Arthur
Sonzogni)](https://github.com/ArthurSonzogni).
- Improved documentation
([#704](https://github.com/fmtlib/fmt/issues/704),
[#1643 ](https://github.com/fmtlib/fmt/pull/1643 ),
[#1660 ](https://github.com/fmtlib/fmt/pull/1660 ),
[#1681 ](https://github.com/fmtlib/fmt/pull/1681 ),
[#1691 ](https://github.com/fmtlib/fmt/pull/1691 ),
[#1706 ](https://github.com/fmtlib/fmt/pull/1706 ),
[#1714 ](https://github.com/fmtlib/fmt/pull/1714 ),
[#1721 ](https://github.com/fmtlib/fmt/pull/1721 ),
[#1739 ](https://github.com/fmtlib/fmt/pull/1739 ),
[#1740 ](https://github.com/fmtlib/fmt/pull/1740 ),
[#1741 ](https://github.com/fmtlib/fmt/pull/1741 ),
[#1751 ](https://github.com/fmtlib/fmt/pull/1751 )). Thanks
[\@senior7515 (Alexander Gallego) ](https://github.com/senior7515 ),
[\@lsr0 (Lindsay Roberts) ](https://github.com/lsr0 ), [\@puetzk
(Kevin Puetz)](https://github.com/puetzk), [\@fpelliccioni (Fernando
Pelliccioni)](https://github.com/fpelliccioni), Alexey Kuzmenko,
[\@jelly (jelle van der Waa) ](https://github.com/jelly ),
[\@claremacrae (Clare Macrae) ](https://github.com/claremacrae ),
[\@jiapengwen (文佳鹏) ](https://github.com/jiapengwen ),
[\@gsjaardema (Greg Sjaardema) ](https://github.com/gsjaardema ),
[\@alexey-milovidov ](https://github.com/alexey-milovidov ).
- Implemented various build configuration fixes and improvements
([#1603](https://github.com/fmtlib/fmt/pull/1603),
[#1657 ](https://github.com/fmtlib/fmt/pull/1657 ),
[#1702 ](https://github.com/fmtlib/fmt/pull/1702 ),
[#1728 ](https://github.com/fmtlib/fmt/pull/1728 )). Thanks
[\@scramsby (Scott Ramsby) ](https://github.com/scramsby ), [\@jtojnar
(Jan Tojnar)](https://github.com/jtojnar), [\@orivej (Orivej
Desh)](https://github.com/orivej),
[\@flagarde ](https://github.com/flagarde ).
- Fixed various warnings and compilation issues
([#1616](https://github.com/fmtlib/fmt/pull/1616),
[#1620 ](https://github.com/fmtlib/fmt/issues/1620 ),
[#1622 ](https://github.com/fmtlib/fmt/issues/1622 ),
[#1625 ](https://github.com/fmtlib/fmt/issues/1625 ),
[#1627 ](https://github.com/fmtlib/fmt/pull/1627 ),
[#1628 ](https://github.com/fmtlib/fmt/issues/1628 ),
[#1629 ](https://github.com/fmtlib/fmt/pull/1629 ),
[#1631 ](https://github.com/fmtlib/fmt/issues/1631 ),
[#1633 ](https://github.com/fmtlib/fmt/pull/1633 ),
[#1649 ](https://github.com/fmtlib/fmt/pull/1649 ),
[#1658 ](https://github.com/fmtlib/fmt/issues/1658 ),
[#1661 ](https://github.com/fmtlib/fmt/pull/1661 ),
[#1667 ](https://github.com/fmtlib/fmt/pull/1667 ),
[#1668 ](https://github.com/fmtlib/fmt/issues/1668 ),
[#1669 ](https://github.com/fmtlib/fmt/pull/1669 ),
[#1692 ](https://github.com/fmtlib/fmt/issues/1692 ),
[#1696 ](https://github.com/fmtlib/fmt/pull/1696 ),
[#1697 ](https://github.com/fmtlib/fmt/pull/1697 ),
[#1707 ](https://github.com/fmtlib/fmt/issues/1707 ),
[#1712 ](https://github.com/fmtlib/fmt/pull/1712 ),
[#1716 ](https://github.com/fmtlib/fmt/pull/1716 ),
[#1722 ](https://github.com/fmtlib/fmt/pull/1722 ),
[#1724 ](https://github.com/fmtlib/fmt/issues/1724 ),
[#1729 ](https://github.com/fmtlib/fmt/pull/1729 ),
[#1738 ](https://github.com/fmtlib/fmt/pull/1738 ),
[#1742 ](https://github.com/fmtlib/fmt/issues/1742 ),
[#1743 ](https://github.com/fmtlib/fmt/issues/1743 ),
[#1744 ](https://github.com/fmtlib/fmt/pull/1744 ),
[#1747 ](https://github.com/fmtlib/fmt/issues/1747 ),
[#1750 ](https://github.com/fmtlib/fmt/pull/1750 )). Thanks
[\@gsjaardema (Greg Sjaardema) ](https://github.com/gsjaardema ),
[\@gabime (Gabi Melman) ](https://github.com/gabime ), [\@johnor
(Johan)](https://github.com/johnor), [\@Kurkin (Dmitry
Kurkin)](https://github.com/Kurkin), [\@invexed (James
Beach)](https://github.com/invexed),
[\@peterbell10 ](https://github.com/peterbell10 ), [\@daixtrose
(Markus Werle)](https://github.com/daixtrose), [\@petrutlucian94
(Lucian Petrut)](https://github.com/petrutlucian94), [\@Neargye
(Daniil Goncharov)](https://github.com/Neargye), [\@ambitslix
(Attila M. Szilagyi)](https://github.com/ambitslix), [\@gabime (Gabi
Melman)](https://github.com/gabime), [\@erthink (Leonid
Yuriev)](https://github.com/erthink), [\@tohammer (Tobias
Hammer)](https://github.com/tohammer), [\@0x8000-0000 (Florin
Iucha)](https://github.com/0x8000-0000).
# 6.2.1 - 2020-05-09
- Fixed ostream support in `sprintf`
([#1631](https://github.com/fmtlib/fmt/issues/1631)).
- Fixed type detection when using implicit conversion to `string_view`
and ostream `operator<<` inconsistently
([#1662](https://github.com/fmtlib/fmt/issues/1662)).
# 6.2.0 - 2020-04-05
- Improved error reporting when trying to format an object of a
non-formattable type:
```c++
fmt::format("{}", S());
```
now gives:
include/fmt/core.h:1015:5: error: static_assert failed due to requirement
'formattable' "Cannot format argument. To make type T formattable provide a
formatter< T > specialization:
https://fmt.dev/latest/api.html#formatting-user-defined-types"
static_assert(
^
...
note: in instantiation of function template specialization
'fmt::v6::format< char [ 3 ] , S , char > ' requested here
fmt::format("{}", S());
^
if `S` is not formattable.
- Reduced the library size by \~10%.
- Always print decimal point if `#` is specified
([#1476](https://github.com/fmtlib/fmt/issues/1476),
[#1498 ](https://github.com/fmtlib/fmt/issues/1498 )):
```c++
fmt::print("{:#.0f}", 42.0);
```
now prints `42.`
- Implemented the `'L'` specifier for locale-specific numeric
formatting to improve compatibility with `std::format` . The `'n'`
specifier is now deprecated and will be removed in the next major
release.
- Moved OS-specific APIs such as `windows_error` from `fmt/format.h`
to `fmt/os.h` . You can define `FMT_DEPRECATED_INCLUDE_OS` to
automatically include `fmt/os.h` from `fmt/format.h` for
compatibility but this will be disabled in the next major release.
- Added precision overflow detection in floating-point formatting.
- Implemented detection of invalid use of `fmt::arg` .
- Used `type_identity` to block unnecessary template argument
deduction. Thanks Tim Song.
- Improved UTF-8 handling
([#1109](https://github.com/fmtlib/fmt/issues/1109)):
```c++
fmt::print("┌{0:─^{2}}┐\n"
"│{1: ^{2}}│\n"
"└{0:─^{2}}┘\n", "", "Привет, мир!", 20);
```
now prints:
┌────────────────────┐
│ Привет, мир! │
└────────────────────┘
on systems that support Unicode.
- Added experimental dynamic argument storage
([#1170](https://github.com/fmtlib/fmt/issues/1170),
[#1584 ](https://github.com/fmtlib/fmt/pull/1584 )):
```c++
fmt::dynamic_format_arg_store< fmt::format_context > store;
store.push_back("answer");
store.push_back(42);
fmt::vprint("The {} is {}.\n", store);
```
prints:
The answer is 42.
Thanks [\@vsolontsov-ll (Vladimir
Solontsov)](https://github.com/vsolontsov-ll).
- Made `fmt::join` accept `initializer_list`
([#1591](https://github.com/fmtlib/fmt/pull/1591)). Thanks
[\@Rapotkinnik (Nikolay Rapotkin) ](https://github.com/Rapotkinnik ).
- Fixed handling of empty tuples
([#1588](https://github.com/fmtlib/fmt/issues/1588)).
- Fixed handling of output iterators in `format_to_n`
([#1506](https://github.com/fmtlib/fmt/issues/1506)).
- Fixed formatting of `std::chrono::duration` types to wide output
([#1533](https://github.com/fmtlib/fmt/pull/1533)). Thanks [\@zeffy
(pilao)](https://github.com/zeffy).
- Added const `begin` and `end` overload to buffers
([#1553](https://github.com/fmtlib/fmt/pull/1553)). Thanks
[\@dominicpoeschko ](https://github.com/dominicpoeschko ).
- Added the ability to disable floating-point formatting via
`FMT_USE_FLOAT` , `FMT_USE_DOUBLE` and `FMT_USE_LONG_DOUBLE` macros
for extremely memory-constrained embedded system
([#1590](https://github.com/fmtlib/fmt/pull/1590)). Thanks
[\@albaguirre (Alberto Aguirre) ](https://github.com/albaguirre ).
- Made `FMT_STRING` work with `constexpr` `string_view`
([#1589](https://github.com/fmtlib/fmt/pull/1589)). Thanks
[\@scramsby (Scott Ramsby) ](https://github.com/scramsby ).
- Implemented a minor optimization in the format string parser
([#1560](https://github.com/fmtlib/fmt/pull/1560)). Thanks
[\@IkarusDeveloper ](https://github.com/IkarusDeveloper ).
- Improved attribute detection
([#1469](https://github.com/fmtlib/fmt/pull/1469),
[#1475 ](https://github.com/fmtlib/fmt/pull/1475 ),
[#1576 ](https://github.com/fmtlib/fmt/pull/1576 )). Thanks
[\@federico-busato (Federico) ](https://github.com/federico-busato ),
[\@chronoxor (Ivan Shynkarenka) ](https://github.com/chronoxor ),
[\@refnum ](https://github.com/refnum ).
- Improved documentation
([#1481](https://github.com/fmtlib/fmt/pull/1481),
[#1523 ](https://github.com/fmtlib/fmt/pull/1523 )). Thanks
[\@JackBoosY (Jack·Boos·Yu) ](https://github.com/JackBoosY ),
[\@imba-tjd (谭九鼎) ](https://github.com/imba-tjd ).
- Fixed symbol visibility on Linux when compiling with
`-fvisibility=hidden`
([#1535](https://github.com/fmtlib/fmt/pull/1535)). Thanks
[\@milianw (Milian Wolff) ](https://github.com/milianw ).
- Implemented various build configuration fixes and improvements
([#1264](https://github.com/fmtlib/fmt/issues/1264),
[#1460 ](https://github.com/fmtlib/fmt/issues/1460 ),
[#1534 ](https://github.com/fmtlib/fmt/pull/1534 ),
[#1536 ](https://github.com/fmtlib/fmt/issues/1536 ),
[#1545 ](https://github.com/fmtlib/fmt/issues/1545 ),
[#1546 ](https://github.com/fmtlib/fmt/pull/1546 ),
[#1566 ](https://github.com/fmtlib/fmt/issues/1566 ),
[#1582 ](https://github.com/fmtlib/fmt/pull/1582 ),
[#1597 ](https://github.com/fmtlib/fmt/issues/1597 ),
[#1598 ](https://github.com/fmtlib/fmt/pull/1598 )). Thanks
[\@ambitslix (Attila M. Szilagyi) ](https://github.com/ambitslix ),
[\@jwillikers (Jordan Williams) ](https://github.com/jwillikers ),
[\@stac47 (Laurent Stacul) ](https://github.com/stac47 ).
- Fixed various warnings and compilation issues
([#1433](https://github.com/fmtlib/fmt/pull/1433),
[#1461 ](https://github.com/fmtlib/fmt/issues/1461 ),
[#1470 ](https://github.com/fmtlib/fmt/pull/1470 ),
[#1480 ](https://github.com/fmtlib/fmt/pull/1480 ),
[#1485 ](https://github.com/fmtlib/fmt/pull/1485 ),
[#1492 ](https://github.com/fmtlib/fmt/pull/1492 ),
[#1493 ](https://github.com/fmtlib/fmt/issues/1493 ),
[#1504 ](https://github.com/fmtlib/fmt/issues/1504 ),
[#1505 ](https://github.com/fmtlib/fmt/pull/1505 ),
[#1512 ](https://github.com/fmtlib/fmt/pull/1512 ),
[#1515 ](https://github.com/fmtlib/fmt/issues/1515 ),
[#1516 ](https://github.com/fmtlib/fmt/pull/1516 ),
[#1518 ](https://github.com/fmtlib/fmt/pull/1518 ),
[#1519 ](https://github.com/fmtlib/fmt/pull/1519 ),
[#1520 ](https://github.com/fmtlib/fmt/pull/1520 ),
[#1521 ](https://github.com/fmtlib/fmt/pull/1521 ),
[#1522 ](https://github.com/fmtlib/fmt/pull/1522 ),
[#1524 ](https://github.com/fmtlib/fmt/issues/1524 ),
[#1530 ](https://github.com/fmtlib/fmt/pull/1530 ),
[#1531 ](https://github.com/fmtlib/fmt/issues/1531 ),
[#1532 ](https://github.com/fmtlib/fmt/pull/1532 ),
[#1539 ](https://github.com/fmtlib/fmt/issues/1539 ),
[#1547 ](https://github.com/fmtlib/fmt/issues/1547 ),
[#1548 ](https://github.com/fmtlib/fmt/issues/1548 ),
[#1554 ](https://github.com/fmtlib/fmt/pull/1554 ),
[#1567 ](https://github.com/fmtlib/fmt/issues/1567 ),
[#1568 ](https://github.com/fmtlib/fmt/pull/1568 ),
[#1569 ](https://github.com/fmtlib/fmt/pull/1569 ),
[#1571 ](https://github.com/fmtlib/fmt/pull/1571 ),
[#1573 ](https://github.com/fmtlib/fmt/pull/1573 ),
[#1575 ](https://github.com/fmtlib/fmt/pull/1575 ),
[#1581 ](https://github.com/fmtlib/fmt/pull/1581 ),
[#1583 ](https://github.com/fmtlib/fmt/issues/1583 ),
[#1586 ](https://github.com/fmtlib/fmt/issues/1586 ),
[#1587 ](https://github.com/fmtlib/fmt/issues/1587 ),
[#1594 ](https://github.com/fmtlib/fmt/issues/1594 ),
[#1596 ](https://github.com/fmtlib/fmt/pull/1596 ),
[#1604 ](https://github.com/fmtlib/fmt/issues/1604 ),
[#1606 ](https://github.com/fmtlib/fmt/pull/1606 ),
[#1607 ](https://github.com/fmtlib/fmt/issues/1607 ),
[#1609 ](https://github.com/fmtlib/fmt/issues/1609 )). Thanks
[\@marti4d (Chris Martin) ](https://github.com/marti4d ),
[\@iPherian ](https://github.com/iPherian ),
[\@parkertomatoes ](https://github.com/parkertomatoes ), [\@gsjaardema
(Greg Sjaardema)](https://github.com/gsjaardema), [\@chronoxor (Ivan
Shynkarenka)](https://github.com/chronoxor), [\@DanielaE (Daniela
Engert)](https://github.com/DanielaE),
[\@torsten48 ](https://github.com/torsten48 ), [\@tohammer (Tobias
Hammer)](https://github.com/tohammer), [\@lefticus (Jason
Turner)](https://github.com/lefticus), [\@ryusakki
(Haise)](https://github.com/ryusakki), [\@adnsv (Alex
Denisov)](https://github.com/adnsv),
[\@fghzxm ](https://github.com/fghzxm ),
[\@refnum ](https://github.com/refnum ), [\@pramodk (Pramod
Kumbhar)](https://github.com/pramodk),
[\@Spirrwell ](https://github.com/Spirrwell ), [\@scramsby (Scott
Ramsby)](https://github.com/scramsby).
# 6.1.2 - 2019-12-11
- Fixed ABI compatibility with `libfmt.so.6.0.0`
([#1471](https://github.com/fmtlib/fmt/issues/1471)).
- Fixed handling types convertible to `std::string_view`
([#1451](https://github.com/fmtlib/fmt/pull/1451)). Thanks
[\@denizevrenci (Deniz Evrenci) ](https://github.com/denizevrenci ).
- Made CUDA test an opt-in enabled via the `FMT_CUDA_TEST` CMake
option.
- Fixed sign conversion warnings
([#1440](https://github.com/fmtlib/fmt/pull/1440)). Thanks
[\@0x8000-0000 (Florin Iucha) ](https://github.com/0x8000-0000 ).
# 6.1.1 - 2019-12-04
- Fixed shared library build on Windows
([#1443](https://github.com/fmtlib/fmt/pull/1443),
[#1445 ](https://github.com/fmtlib/fmt/issues/1445 ),
[#1446 ](https://github.com/fmtlib/fmt/pull/1446 ),
[#1450 ](https://github.com/fmtlib/fmt/issues/1450 )). Thanks
[\@egorpugin (Egor Pugin) ](https://github.com/egorpugin ), [\@bbolli
(Beat Bolli)](https://github.com/bbolli).
- Added a missing decimal point in exponent notation with trailing
zeros.
- Removed deprecated `format_arg_store::TYPES` .
# 6.1.0 - 2019-12-01
- {fmt} now formats IEEE 754 `float` and `double` using the shortest
decimal representation with correct rounding by default:
```c++
#include < cmath >
#include < fmt / core . h >
int main() {
fmt::print("{}", M_PI);
}
```
prints `3.141592653589793` .
- Made the fast binary to decimal floating-point formatter the
default, simplified it and improved performance. {fmt} is now 15
times faster than libc++\'s `std::ostringstream` , 11 times faster
than `printf` and 10% faster than double-conversion on
[dtoa-benchmark ](https://github.com/fmtlib/dtoa-benchmark ):
+---------------+------------+----------+
| Function | Time (ns) | Speedup |
+===============+============+==========+
| ostringstream | > 1,346.30 | > 1.00x |
+---------------+------------+----------+
| ostrstream | > 1,195.74 | > 1.13x |
+---------------+------------+----------+
| sprintf | > 995.08 | > 1.35x |
+---------------+------------+----------+
| doubleconv | > 99.10 | > 13.59x |
+---------------+------------+----------+
| fmt | > 88.34 | > 15.24x |
+---------------+------------+----------+
2023-09-04 14:59:30 +00:00
2023-09-04 14:07:24 +00:00
- {fmt} no longer converts `float` arguments to `double` . In
particular this improves the default (shortest) representation of
floats and makes `fmt::format` consistent with `std::format` specs
([#1336](https://github.com/fmtlib/fmt/issues/1336),
[#1353 ](https://github.com/fmtlib/fmt/issues/1353 ),
[#1360 ](https://github.com/fmtlib/fmt/pull/1360 ),
[#1361 ](https://github.com/fmtlib/fmt/pull/1361 )):
```c++
fmt::print("{}", 0.1f);
```
prints `0.1` instead of `0.10000000149011612` .
Thanks [\@orivej (Orivej Desh) ](https://github.com/orivej ).
- Made floating-point formatting output consistent with
`printf` /iostreams
([#1376](https://github.com/fmtlib/fmt/issues/1376),
[#1417 ](https://github.com/fmtlib/fmt/issues/1417 )).
- Added support for 128-bit integers
([#1287](https://github.com/fmtlib/fmt/pull/1287)):
```c++
fmt::print("{}", std::numeric_limits< __int128_t > ::max());
```
prints `170141183460469231731687303715884105727` .
Thanks [\@denizevrenci (Deniz
Evrenci)](https://github.com/denizevrenci).
- The overload of `print` that takes `text_style` is now atomic, i.e.
the output from different threads doesn\'t interleave
([#1351](https://github.com/fmtlib/fmt/pull/1351)). Thanks
[\@tankiJong (Tanki Zhang) ](https://github.com/tankiJong ).
- Made compile time in the header-only mode \~20% faster by reducing
the number of template instantiations. `wchar_t` overload of
`vprint` was moved from `fmt/core.h` to `fmt/format.h` .
- Added an overload of `fmt::join` that works with tuples
([#1322](https://github.com/fmtlib/fmt/issues/1322),
[#1330 ](https://github.com/fmtlib/fmt/pull/1330 )):
```c++
#include < tuple >
#include < fmt / ranges . h >
int main() {
std::tuple< char , int , float > t{'a', 1, 2.0f};
fmt::print("{}", t);
}
```
prints `('a', 1, 2.0)` .
Thanks [\@jeremyong (Jeremy Ong) ](https://github.com/jeremyong ).
- Changed formatting of octal zero with prefix from \"00\" to \"0\":
```c++
fmt::print("{:#o}", 0);
```
prints `0` .
- The locale is now passed to ostream insertion (`<< `) operators
([#1406](https://github.com/fmtlib/fmt/pull/1406)):
```c++
#include < fmt / locale . h >
#include < fmt / ostream . h >
struct S {
double value;
};
std::ostream& operator< < (std::ostream& os, S s) {
return os < < s.value ;
}
int main() {
auto s = fmt::format(std::locale("fr_FR.UTF-8"), "{}", S{0.42});
// s == "0,42"
}
```
Thanks [\@dlaugt (Daniel Laügt) ](https://github.com/dlaugt ).
- Locale-specific number formatting now uses grouping
([#1393](https://github.com/fmtlib/fmt/issues/1393)
[#1394 ](https://github.com/fmtlib/fmt/pull/1394 )). Thanks
[\@skrdaniel ](https://github.com/skrdaniel ).
- Fixed handling of types with deleted implicit rvalue conversion to
`const char**` ([#1421](https://github.com/fmtlib/fmt/issues/1421)):
```c++
struct mystring {
operator const char*() const&;
operator const char*() &;
operator const char*() const& & = delete;
operator const char*() & & = delete;
};
mystring str;
fmt::print("{}", str); // now compiles
```
- Enums are now mapped to correct underlying types instead of `int`
([#1286](https://github.com/fmtlib/fmt/pull/1286)). Thanks [\@agmt
(Egor Seredin)](https://github.com/agmt).
- Enum classes are no longer implicitly converted to `int`
([#1424](https://github.com/fmtlib/fmt/issues/1424)).
- Added `basic_format_parse_context` for consistency with C++20
`std::format` and deprecated `basic_parse_context` .
- Fixed handling of UTF-8 in precision
([#1389](https://github.com/fmtlib/fmt/issues/1389),
[#1390 ](https://github.com/fmtlib/fmt/pull/1390 )). Thanks
[\@tajtiattila (Attila Tajti) ](https://github.com/tajtiattila ).
- {fmt} can now be installed on Linux, macOS and Windows with
[Conda ](https://docs.conda.io/en/latest/ ) using its
[conda-forge ](https://conda-forge.org )
[package ](https://github.com/conda-forge/fmt-feedstock )
([#1410](https://github.com/fmtlib/fmt/pull/1410)):
conda install -c conda-forge fmt
Thanks [\@tdegeus (Tom de Geus) ](https://github.com/tdegeus ).
- Added a CUDA test ([#1285](https://github.com/fmtlib/fmt/pull/1285),
[#1317 ](https://github.com/fmtlib/fmt/pull/1317 )). Thanks
[\@luncliff (Park DongHa) ](https://github.com/luncliff ) and
[\@risa2000 ](https://github.com/risa2000 ).
- Improved documentation
([#1276](https://github.com/fmtlib/fmt/pull/1276),
[#1291 ](https://github.com/fmtlib/fmt/issues/1291 ),
[#1296 ](https://github.com/fmtlib/fmt/issues/1296 ),
[#1315 ](https://github.com/fmtlib/fmt/pull/1315 ),
[#1332 ](https://github.com/fmtlib/fmt/pull/1332 ),
[#1337 ](https://github.com/fmtlib/fmt/pull/1337 ),
[#1395 ](https://github.com/fmtlib/fmt/issues/1395 )
[#1418 ](https://github.com/fmtlib/fmt/pull/1418 )). Thanks
[\@waywardmonkeys (Bruce
Mitchener)](https://github.com/waywardmonkeys), [\@pauldreik (Paul
Dreik)](https://github.com/pauldreik), [\@jackoalan (Jack
Andersen)](https://github.com/jackoalan).
- Various code improvements
([#1358](https://github.com/fmtlib/fmt/pull/1358),
[#1407 ](https://github.com/fmtlib/fmt/pull/1407 )). Thanks [\@orivej
(Orivej Desh)](https://github.com/orivej), [\@dpacbach (David P.
Sicilia)](https://github.com/dpacbach),
- Fixed compile-time format string checks for user-defined types
([#1292](https://github.com/fmtlib/fmt/issues/1292)).
- Worked around a false positive in `unsigned-integer-overflow`
sanitizer ([#1377](https://github.com/fmtlib/fmt/issues/1377)).
- Fixed various warnings and compilation issues
([#1273](https://github.com/fmtlib/fmt/issues/1273),
[#1278 ](https://github.com/fmtlib/fmt/pull/1278 ),
[#1280 ](https://github.com/fmtlib/fmt/pull/1280 ),
[#1281 ](https://github.com/fmtlib/fmt/issues/1281 ),
[#1288 ](https://github.com/fmtlib/fmt/issues/1288 ),
[#1290 ](https://github.com/fmtlib/fmt/pull/1290 ),
[#1301 ](https://github.com/fmtlib/fmt/pull/1301 ),
[#1305 ](https://github.com/fmtlib/fmt/issues/1305 ),
[#1306 ](https://github.com/fmtlib/fmt/issues/1306 ),
[#1309 ](https://github.com/fmtlib/fmt/issues/1309 ),
[#1312 ](https://github.com/fmtlib/fmt/pull/1312 ),
[#1313 ](https://github.com/fmtlib/fmt/issues/1313 ),
[#1316 ](https://github.com/fmtlib/fmt/issues/1316 ),
[#1319 ](https://github.com/fmtlib/fmt/issues/1319 ),
[#1320 ](https://github.com/fmtlib/fmt/pull/1320 ),
[#1326 ](https://github.com/fmtlib/fmt/pull/1326 ),
[#1328 ](https://github.com/fmtlib/fmt/pull/1328 ),
[#1344 ](https://github.com/fmtlib/fmt/issues/1344 ),
[#1345 ](https://github.com/fmtlib/fmt/pull/1345 ),
[#1347 ](https://github.com/fmtlib/fmt/pull/1347 ),
[#1349 ](https://github.com/fmtlib/fmt/pull/1349 ),
[#1354 ](https://github.com/fmtlib/fmt/issues/1354 ),
[#1362 ](https://github.com/fmtlib/fmt/issues/1362 ),
[#1366 ](https://github.com/fmtlib/fmt/issues/1366 ),
[#1364 ](https://github.com/fmtlib/fmt/pull/1364 ),
[#1370 ](https://github.com/fmtlib/fmt/pull/1370 ),
[#1371 ](https://github.com/fmtlib/fmt/pull/1371 ),
[#1385 ](https://github.com/fmtlib/fmt/issues/1385 ),
[#1388 ](https://github.com/fmtlib/fmt/issues/1388 ),
[#1397 ](https://github.com/fmtlib/fmt/pull/1397 ),
[#1414 ](https://github.com/fmtlib/fmt/pull/1414 ),
[#1416 ](https://github.com/fmtlib/fmt/pull/1416 ),
[#1422 ](https://github.com/fmtlib/fmt/issues/1422 )
[#1427 ](https://github.com/fmtlib/fmt/pull/1427 ),
[#1431 ](https://github.com/fmtlib/fmt/issues/1431 ),
[#1433 ](https://github.com/fmtlib/fmt/pull/1433 )). Thanks
[\@hhb ](https://github.com/hhb ), [\@gsjaardema (Greg
Sjaardema)](https://github.com/gsjaardema), [\@gabime (Gabi
Melman)](https://github.com/gabime), [\@neheb (Rosen
Penev)](https://github.com/neheb), [\@vedranmiletic (Vedran
Miletić)](https://github.com/vedranmiletic), [\@dkavolis (Daumantas
Kavolis)](https://github.com/dkavolis),
[\@mwinterb ](https://github.com/mwinterb ), [\@orivej (Orivej
Desh)](https://github.com/orivej), [\@denizevrenci (Deniz
Evrenci)](https://github.com/denizevrenci)
[\@leonklingele ](https://github.com/leonklingele ), [\@chronoxor
(Ivan Shynkarenka)](https://github.com/chronoxor),
[\@kent-tri ](https://github.com/kent-tri ), [\@0x8000-0000 (Florin
Iucha)](https://github.com/0x8000-0000), [\@marti4d (Chris
Martin)](https://github.com/marti4d).
# 6.0.0 - 2019-08-26
- Switched to the [MIT
license](https://github.com/fmtlib/fmt/blob/5a4b24613ba16cc689977c3b5bd8274a3ba1dd1f/LICENSE.rst)
with an optional exception that allows distributing binary code
without attribution.
- Floating-point formatting is now locale-independent by default:
```c++
#include < locale >
#include < fmt / core . h >
int main() {
std::locale::global(std::locale("ru_RU.UTF-8"));
fmt::print("value = {}", 4.2);
}
```
prints \"value = 4.2\" regardless of the locale.
For locale-specific formatting use the `n` specifier:
```c++
std::locale::global(std::locale("ru_RU.UTF-8"));
fmt::print("value = {:n}", 4.2);
```
prints \"value = 4,2\".
- Added an experimental Grisu floating-point formatting algorithm
implementation (disabled by default). To enable it compile with the
`FMT_USE_GRISU` macro defined to 1:
```c++
#define FMT_USE_GRISU 1
#include < fmt / format . h >
auto s = fmt::format("{}", 4.2); // formats 4.2 using Grisu
```
With Grisu enabled, {fmt} is 13x faster than `std::ostringstream`
(libc++) and 10x faster than `sprintf` on
[dtoa-benchmark ](https://github.com/fmtlib/dtoa-benchmark ) ([full
results](https://fmt.dev/unknown_mac64_clang10.0.html)):
2023-09-04 14:59:30 +00:00
2023-09-04 14:07:24 +00:00
- Separated formatting and parsing contexts for consistency with
[C++20 std::format ](http://eel.is/c++draft/format ), removing the
undocumented `basic_format_context::parse_context()` function.
- Added [oss-fuzz ](https://github.com/google/oss-fuzz ) support
([#1199](https://github.com/fmtlib/fmt/pull/1199)). Thanks
[\@pauldreik (Paul Dreik) ](https://github.com/pauldreik ).
- `formatter` specializations now always take precedence over
`operator<<` ([#952](https://github.com/fmtlib/fmt/issues/952)):
```c++
#include < iostream >
#include < fmt / ostream . h >
struct S {};
std::ostream& operator< < (std::ostream& os, S) {
return os < < 1 ;
}
template < >
struct fmt::formatter< S > : fmt::formatter< int > {
auto format(S, format_context& ctx) {
return formatter< int > ::format(2, ctx);
}
};
int main() {
std::cout < < S () << " \n"; // prints 1 using operator <<
fmt::print("{}\n", S()); // prints 2 using formatter
}
```
- Introduced the experimental `fmt::compile` function that does format
string compilation
([#618](https://github.com/fmtlib/fmt/issues/618),
[#1169 ](https://github.com/fmtlib/fmt/issues/1169 ),
[#1171 ](https://github.com/fmtlib/fmt/pull/1171 )):
```c++
#include < fmt / compile . h >
auto f = fmt::compile< int > ("{}");
std::string s = fmt::format(f, 42); // can be called multiple times to
// format different values
// s == "42"
```
It moves the cost of parsing a format string outside of the format
function which can be beneficial when identically formatting many
objects of the same types. Thanks [\@stryku (Mateusz
Janek)](https://github.com/stryku).
- Added experimental `%` format specifier that formats floating-point
values as percentages
([#1060](https://github.com/fmtlib/fmt/pull/1060),
[#1069 ](https://github.com/fmtlib/fmt/pull/1069 ),
[#1071 ](https://github.com/fmtlib/fmt/pull/1071 )):
```c++
auto s = fmt::format("{:.1%}", 0.42); // s == "42.0%"
```
Thanks [\@gawain-bolton (Gawain
Bolton)](https://github.com/gawain-bolton).
- Implemented precision for floating-point durations
([#1004](https://github.com/fmtlib/fmt/issues/1004),
[#1012 ](https://github.com/fmtlib/fmt/pull/1012 )):
```c++
auto s = fmt::format("{:.1}", std::chrono::duration< double > (1.234));
// s == 1.2s
```
Thanks [\@DanielaE (Daniela Engert) ](https://github.com/DanielaE ).
- Implemented `chrono` format specifiers `%Q` and `%q` that give the
value and the unit respectively
([#1019](https://github.com/fmtlib/fmt/pull/1019)):
```c++
auto value = fmt::format("{:%Q}", 42s); // value == "42"
auto unit = fmt::format("{:%q}", 42s); // unit == "s"
```
Thanks [\@DanielaE (Daniela Engert) ](https://github.com/DanielaE ).
- Fixed handling of dynamic width in chrono formatter:
```c++
auto s = fmt::format("{0:{1}%H:%M:%S}", std::chrono::seconds(12345), 12);
// ^ width argument index ^ width
// s == "03:25:45 "
```
Thanks Howard Hinnant.
- Removed deprecated `fmt/time.h` . Use `fmt/chrono.h` instead.
- Added `fmt::format` and `fmt::vformat` overloads that take
`text_style` ([#993](https://github.com/fmtlib/fmt/issues/993),
[#994 ](https://github.com/fmtlib/fmt/pull/994 )):
```c++
#include < fmt / color . h >
std::string message = fmt::format(fmt::emphasis::bold | fg(fmt::color::red),
"The answer is {}.", 42);
```
Thanks [\@Naios (Denis Blank) ](https://github.com/Naios ).
- Removed the deprecated color API (`print_colored`). Use the new API,
namely `print` overloads that take `text_style` instead.
- Made `std::unique_ptr` and `std::shared_ptr` formattable as pointers
via `fmt::ptr` ([#1121](https://github.com/fmtlib/fmt/pull/1121)):
```c++
std::unique_ptr< int > p = ...;
fmt::print("{}", fmt::ptr(p)); // prints p as a pointer
```
Thanks [\@sighingnow (Tao He) ](https://github.com/sighingnow ).
- Made `print` and `vprint` report I/O errors
([#1098](https://github.com/fmtlib/fmt/issues/1098),
[#1099 ](https://github.com/fmtlib/fmt/pull/1099 )). Thanks
[\@BillyDonahue (Billy Donahue) ](https://github.com/BillyDonahue ).
- Marked deprecated APIs with the `[[deprecated]]` attribute and
removed internal uses of deprecated APIs
([#1022](https://github.com/fmtlib/fmt/pull/1022)). Thanks
[\@eliaskosunen (Elias Kosunen) ](https://github.com/eliaskosunen ).
- Modernized the codebase using more C++11 features and removing
workarounds. Most importantly, `buffer_context` is now an alias
template, so use `buffer_context<T>` instead of
`buffer_context<T>::type` . These features require GCC 4.8 or later.
- `formatter` specializations now always take precedence over implicit
conversions to `int` and the undocumented `convert_to_int` trait is
now deprecated.
- Moved the undocumented `basic_writer` , `writer` , and `wwriter` types
to the `internal` namespace.
- Removed deprecated `basic_format_context::begin()` . Use `out()`
instead.
- Disallowed passing the result of `join` as an lvalue to prevent
misuse.
- Refactored the undocumented structs that represent parsed format
specifiers to simplify the API and allow multibyte fill.
- Moved SFINAE to template parameters to reduce symbol sizes.
- Switched to `fputws` for writing wide strings so that it\'s no
longer required to call `_setmode` on Windows
([#1229](https://github.com/fmtlib/fmt/issues/1229),
[#1243 ](https://github.com/fmtlib/fmt/pull/1243 )). Thanks
[\@jackoalan (Jack Andersen) ](https://github.com/jackoalan ).
- Improved literal-based API
([#1254](https://github.com/fmtlib/fmt/pull/1254)). Thanks
[\@sylveon (Charles Milette) ](https://github.com/sylveon ).
- Added support for exotic platforms without `uintptr_t` such as IBM i
(AS/400) which has 128-bit pointers and only 64-bit integers
([#1059](https://github.com/fmtlib/fmt/issues/1059)).
- Added [Sublime Text syntax highlighting
config](https://github.com/fmtlib/fmt/blob/master/support/C%2B%2B.sublime-syntax)
([#1037](https://github.com/fmtlib/fmt/issues/1037)). Thanks
[\@Kronuz (Germán Méndez Bravo) ](https://github.com/Kronuz ).
- Added the `FMT_ENFORCE_COMPILE_STRING` macro to enforce the use of
compile-time format strings
([#1231](https://github.com/fmtlib/fmt/pull/1231)). Thanks
[\@jackoalan (Jack Andersen) ](https://github.com/jackoalan ).
- Stopped setting `CMAKE_BUILD_TYPE` if {fmt} is a subproject
([#1081](https://github.com/fmtlib/fmt/issues/1081)).
- Various build improvements
([#1039](https://github.com/fmtlib/fmt/pull/1039),
[#1078 ](https://github.com/fmtlib/fmt/pull/1078 ),
[#1091 ](https://github.com/fmtlib/fmt/pull/1091 ),
[#1103 ](https://github.com/fmtlib/fmt/pull/1103 ),
[#1177 ](https://github.com/fmtlib/fmt/pull/1177 )). Thanks
[\@luncliff (Park DongHa) ](https://github.com/luncliff ),
[\@jasonszang (Jason Shuo Zang) ](https://github.com/jasonszang ),
[\@olafhering (Olaf Hering) ](https://github.com/olafhering ),
[\@Lecetem ](https://github.com/Lectem ), [\@pauldreik (Paul
Dreik)](https://github.com/pauldreik).
- Improved documentation
([#1049](https://github.com/fmtlib/fmt/issues/1049),
[#1051 ](https://github.com/fmtlib/fmt/pull/1051 ),
[#1083 ](https://github.com/fmtlib/fmt/pull/1083 ),
[#1113 ](https://github.com/fmtlib/fmt/pull/1113 ),
[#1114 ](https://github.com/fmtlib/fmt/pull/1114 ),
[#1146 ](https://github.com/fmtlib/fmt/issues/1146 ),
[#1180 ](https://github.com/fmtlib/fmt/issues/1180 ),
[#1250 ](https://github.com/fmtlib/fmt/pull/1250 ),
[#1252 ](https://github.com/fmtlib/fmt/pull/1252 ),
[#1265 ](https://github.com/fmtlib/fmt/pull/1265 )). Thanks [\@mikelui
(Michael Lui)](https://github.com/mikelui), [\@foonathan (Jonathan
Müller)](https://github.com/foonathan), [\@BillyDonahue (Billy
Donahue)](https://github.com/BillyDonahue), [\@jwakely (Jonathan
Wakely)](https://github.com/jwakely), [\@kaisbe (Kais Ben
Salah)](https://github.com/kaisbe), [\@sdebionne (Samuel
Debionne)](https://github.com/sdebionne).
- Fixed ambiguous formatter specialization in `fmt/ranges.h`
([#1123](https://github.com/fmtlib/fmt/issues/1123)).
- Fixed formatting of a non-empty `std::filesystem::path` which is an
infinitely deep range of its components
([#1268](https://github.com/fmtlib/fmt/issues/1268)).
- Fixed handling of general output iterators when formatting
characters ([#1056](https://github.com/fmtlib/fmt/issues/1056),
[#1058 ](https://github.com/fmtlib/fmt/pull/1058 )). Thanks [\@abolz
(Alexander Bolz)](https://github.com/abolz).
- Fixed handling of output iterators in `formatter` specialization for
ranges ([#1064](https://github.com/fmtlib/fmt/issues/1064)).
- Fixed handling of exotic character types
([#1188](https://github.com/fmtlib/fmt/issues/1188)).
- Made chrono formatting work with exceptions disabled
([#1062](https://github.com/fmtlib/fmt/issues/1062)).
- Fixed DLL visibility issues
([#1134](https://github.com/fmtlib/fmt/pull/1134),
[#1147 ](https://github.com/fmtlib/fmt/pull/1147 )). Thanks
[\@denchat ](https://github.com/denchat ).
- Disabled the use of UDL template extension on GCC 9
([#1148](https://github.com/fmtlib/fmt/issues/1148)).
- Removed misplaced `format` compile-time checks from `printf`
([#1173](https://github.com/fmtlib/fmt/issues/1173)).
- Fixed issues in the experimental floating-point formatter
([#1072](https://github.com/fmtlib/fmt/issues/1072),
[#1129 ](https://github.com/fmtlib/fmt/issues/1129 ),
[#1153 ](https://github.com/fmtlib/fmt/issues/1153 ),
[#1155 ](https://github.com/fmtlib/fmt/pull/1155 ),
[#1210 ](https://github.com/fmtlib/fmt/issues/1210 ),
[#1222 ](https://github.com/fmtlib/fmt/issues/1222 )). Thanks
[\@alabuzhev (Alex Alabuzhev) ](https://github.com/alabuzhev ).
- Fixed bugs discovered by fuzzing or during fuzzing integration
([#1124](https://github.com/fmtlib/fmt/issues/1124),
[#1127 ](https://github.com/fmtlib/fmt/issues/1127 ),
[#1132 ](https://github.com/fmtlib/fmt/issues/1132 ),
[#1135 ](https://github.com/fmtlib/fmt/pull/1135 ),
[#1136 ](https://github.com/fmtlib/fmt/issues/1136 ),
[#1141 ](https://github.com/fmtlib/fmt/issues/1141 ),
[#1142 ](https://github.com/fmtlib/fmt/issues/1142 ),
[#1178 ](https://github.com/fmtlib/fmt/issues/1178 ),
[#1179 ](https://github.com/fmtlib/fmt/issues/1179 ),
[#1194 ](https://github.com/fmtlib/fmt/issues/1194 )). Thanks
[\@pauldreik (Paul Dreik) ](https://github.com/pauldreik ).
- Fixed building tests on FreeBSD and Hurd
([#1043](https://github.com/fmtlib/fmt/issues/1043)). Thanks
[\@jackyf (Eugene V. Lyubimkin) ](https://github.com/jackyf ).
- Fixed various warnings and compilation issues
([#998](https://github.com/fmtlib/fmt/pull/998),
[#1006 ](https://github.com/fmtlib/fmt/pull/1006 ),
[#1008 ](https://github.com/fmtlib/fmt/issues/1008 ),
[#1011 ](https://github.com/fmtlib/fmt/issues/1011 ),
[#1025 ](https://github.com/fmtlib/fmt/issues/1025 ),
[#1027 ](https://github.com/fmtlib/fmt/pull/1027 ),
[#1028 ](https://github.com/fmtlib/fmt/pull/1028 ),
[#1029 ](https://github.com/fmtlib/fmt/pull/1029 ),
[#1030 ](https://github.com/fmtlib/fmt/pull/1030 ),
[#1031 ](https://github.com/fmtlib/fmt/pull/1031 ),
[#1054 ](https://github.com/fmtlib/fmt/pull/1054 ),
[#1063 ](https://github.com/fmtlib/fmt/issues/1063 ),
[#1068 ](https://github.com/fmtlib/fmt/pull/1068 ),
[#1074 ](https://github.com/fmtlib/fmt/pull/1074 ),
[#1075 ](https://github.com/fmtlib/fmt/pull/1075 ),
[#1079 ](https://github.com/fmtlib/fmt/pull/1079 ),
[#1086 ](https://github.com/fmtlib/fmt/pull/1086 ),
[#1088 ](https://github.com/fmtlib/fmt/issues/1088 ),
[#1089 ](https://github.com/fmtlib/fmt/pull/1089 ),
[#1094 ](https://github.com/fmtlib/fmt/pull/1094 ),
[#1101 ](https://github.com/fmtlib/fmt/issues/1101 ),
[#1102 ](https://github.com/fmtlib/fmt/pull/1102 ),
[#1105 ](https://github.com/fmtlib/fmt/issues/1105 ),
[#1107 ](https://github.com/fmtlib/fmt/pull/1107 ),
[#1115 ](https://github.com/fmtlib/fmt/issues/1115 ),
[#1117 ](https://github.com/fmtlib/fmt/issues/1117 ),
[#1118 ](https://github.com/fmtlib/fmt/issues/1118 ),
[#1120 ](https://github.com/fmtlib/fmt/issues/1120 ),
[#1123 ](https://github.com/fmtlib/fmt/issues/1123 ),
[#1139 ](https://github.com/fmtlib/fmt/pull/1139 ),
[#1140 ](https://github.com/fmtlib/fmt/issues/1140 ),
[#1143 ](https://github.com/fmtlib/fmt/issues/1143 ),
[#1144 ](https://github.com/fmtlib/fmt/pull/1144 ),
[#1150 ](https://github.com/fmtlib/fmt/pull/1150 ),
[#1151 ](https://github.com/fmtlib/fmt/pull/1151 ),
[#1152 ](https://github.com/fmtlib/fmt/issues/1152 ),
[#1154 ](https://github.com/fmtlib/fmt/issues/1154 ),
[#1156 ](https://github.com/fmtlib/fmt/issues/1156 ),
[#1159 ](https://github.com/fmtlib/fmt/pull/1159 ),
[#1175 ](https://github.com/fmtlib/fmt/issues/1175 ),
[#1181 ](https://github.com/fmtlib/fmt/issues/1181 ),
[#1186 ](https://github.com/fmtlib/fmt/issues/1186 ),
[#1187 ](https://github.com/fmtlib/fmt/pull/1187 ),
[#1191 ](https://github.com/fmtlib/fmt/pull/1191 ),
[#1197 ](https://github.com/fmtlib/fmt/issues/1197 ),
[#1200 ](https://github.com/fmtlib/fmt/issues/1200 ),
[#1203 ](https://github.com/fmtlib/fmt/issues/1203 ),
[#1205 ](https://github.com/fmtlib/fmt/issues/1205 ),
[#1206 ](https://github.com/fmtlib/fmt/pull/1206 ),
[#1213 ](https://github.com/fmtlib/fmt/issues/1213 ),
[#1214 ](https://github.com/fmtlib/fmt/issues/1214 ),
[#1217 ](https://github.com/fmtlib/fmt/pull/1217 ),
[#1228 ](https://github.com/fmtlib/fmt/issues/1228 ),
[#1230 ](https://github.com/fmtlib/fmt/pull/1230 ),
[#1232 ](https://github.com/fmtlib/fmt/issues/1232 ),
[#1235 ](https://github.com/fmtlib/fmt/pull/1235 ),
[#1236 ](https://github.com/fmtlib/fmt/pull/1236 ),
[#1240 ](https://github.com/fmtlib/fmt/issues/1240 )). Thanks
[\@DanielaE (Daniela Engert) ](https://github.com/DanielaE ),
[\@mwinterb ](https://github.com/mwinterb ), [\@eliaskosunen (Elias
Kosunen)](https://github.com/eliaskosunen),
[\@morinmorin ](https://github.com/morinmorin ), [\@ricco19 (Brian
Ricciardelli)](https://github.com/ricco19), [\@waywardmonkeys (Bruce
Mitchener)](https://github.com/waywardmonkeys), [\@chronoxor (Ivan
Shynkarenka)](https://github.com/chronoxor),
[\@remyabel ](https://github.com/remyabel ), [\@pauldreik (Paul
Dreik)](https://github.com/pauldreik), [\@gsjaardema (Greg
Sjaardema)](https://github.com/gsjaardema), [\@rcane (Ronny
Krüger)](https://github.com/rcane),
[\@mocabe ](https://github.com/mocabe ),
[\@denchat ](https://github.com/denchat ), [\@cjdb (Christopher Di
Bella)](https://github.com/cjdb), [\@HazardyKnusperkeks (Björn
Schäpers)](https://github.com/HazardyKnusperkeks), [\@vedranmiletic
(Vedran Miletić)](https://github.com/vedranmiletic), [\@jackoalan
(Jack Andersen)](https://github.com/jackoalan), [\@DaanDeMeyer (Daan
De Meyer)](https://github.com/DaanDeMeyer), [\@starkmapper (Mark
Stapper)](https://github.com/starkmapper).
# 5.3.0 - 2018-12-28
- Introduced experimental chrono formatting support:
```c++
#include < fmt / chrono . h >
int main() {
using namespace std::literals::chrono_literals;
fmt::print("Default format: {} {}\n", 42s, 100ms);
fmt::print("strftime-like format: {:%H:%M:%S}\n", 3h + 15min + 30s);
}
```
prints:
Default format: 42s 100ms
strftime-like format: 03:15:30
- Added experimental support for emphasis (bold, italic, underline,
strikethrough), colored output to a file stream, and improved
colored formatting API
([#961](https://github.com/fmtlib/fmt/pull/961),
[#967 ](https://github.com/fmtlib/fmt/pull/967 ),
[#973 ](https://github.com/fmtlib/fmt/pull/973 )):
```c++
#include < fmt / color . h >
int main() {
print(fg(fmt::color::crimson) | fmt::emphasis::bold,
"Hello, {}!\n", "world");
print(fg(fmt::color::floral_white) | bg(fmt::color::slate_gray) |
fmt::emphasis::underline, "Hello, {}!\n", "мир");
print(fg(fmt::color::steel_blue) | fmt::emphasis::italic,
"Hello, {}!\n", "世界");
}
```
prints the following on modern terminals with RGB color support:
2023-09-04 14:59:30 +00:00
2023-09-04 14:07:24 +00:00
Thanks [\@Rakete1111 (Nicolas) ](https://github.com/Rakete1111 ).
- Added support for 4-bit terminal colors
([#968](https://github.com/fmtlib/fmt/issues/968),
[#974 ](https://github.com/fmtlib/fmt/pull/974 ))
```c++
#include < fmt / color . h >
int main() {
print(fg(fmt::terminal_color::red), "stop\n");
}
```
Note that these colors vary by terminal:
2023-09-04 14:59:30 +00:00
2023-09-04 14:07:24 +00:00
Thanks [\@Rakete1111 (Nicolas) ](https://github.com/Rakete1111 ).
- Parameterized formatting functions on the type of the format string
([#880](https://github.com/fmtlib/fmt/issues/880),
[#881 ](https://github.com/fmtlib/fmt/pull/881 ),
[#883 ](https://github.com/fmtlib/fmt/pull/883 ),
[#885 ](https://github.com/fmtlib/fmt/pull/885 ),
[#897 ](https://github.com/fmtlib/fmt/pull/897 ),
[#920 ](https://github.com/fmtlib/fmt/issues/920 )). Any object of
type `S` that has an overloaded `to_string_view(const S&)` returning
`fmt::string_view` can be used as a format string:
```c++
namespace my_ns {
inline string_view to_string_view(const my_string& s) {
return {s.data(), s.length()};
}
}
std::string message = fmt::format(my_string("The answer is {}."), 42);
```
Thanks [\@DanielaE (Daniela Engert) ](https://github.com/DanielaE ).
- Made `std::string_view` work as a format string
([#898](https://github.com/fmtlib/fmt/pull/898)):
```c++
auto message = fmt::format(std::string_view("The answer is {}."), 42);
```
Thanks [\@DanielaE (Daniela Engert) ](https://github.com/DanielaE ).
- Added wide string support to compile-time format string checks
([#924](https://github.com/fmtlib/fmt/pull/924)):
```c++
print(fmt(L"{:f}"), 42); // compile-time error: invalid type specifier
```
Thanks [\@XZiar ](https://github.com/XZiar ).
- Made colored print functions work with wide strings
([#867](https://github.com/fmtlib/fmt/pull/867)):
```c++
#include < fmt / color . h >
int main() {
print(fg(fmt::color::red), L"{}\n", 42);
}
```
Thanks [\@DanielaE (Daniela Engert) ](https://github.com/DanielaE ).
- Introduced experimental Unicode support
([#628](https://github.com/fmtlib/fmt/issues/628),
[#891 ](https://github.com/fmtlib/fmt/pull/891 )):
```c++
using namespace fmt::literals;
auto s = fmt::format("{:*^5}"_u, "🤡"_u); // s == "**🤡**"_u
```
- Improved locale support:
```c++
#include < fmt / locale . h >
struct numpunct : std::numpunct< char > {
protected:
char do_thousands_sep() const override { return '~'; }
};
std::locale loc;
auto s = fmt::format(std::locale(loc, new numpunct()), "{:n}", 1234567);
// s == "1~234~567"
```
- Constrained formatting functions on proper iterator types
([#921](https://github.com/fmtlib/fmt/pull/921)). Thanks [\@DanielaE
(Daniela Engert)](https://github.com/DanielaE).
- Added `make_printf_args` and `make_wprintf_args` functions
([#934](https://github.com/fmtlib/fmt/pull/934)). Thanks
[\@tnovotny ](https://github.com/tnovotny ).
- Deprecated `fmt::visit` , `parse_context` , and `wparse_context` . Use
`fmt::visit_format_arg` , `format_parse_context` , and
`wformat_parse_context` instead.
- Removed undocumented `basic_fixed_buffer` which has been superseded
by the iterator-based API
([#873](https://github.com/fmtlib/fmt/issues/873),
[#902 ](https://github.com/fmtlib/fmt/pull/902 )). Thanks [\@superfunc
(hollywood programmer)](https://github.com/superfunc).
- Disallowed repeated leading zeros in an argument ID:
```c++
fmt::print("{000}", 42); // error
```
- Reintroduced support for gcc 4.4.
- Fixed compilation on platforms with exotic `double`
([#878](https://github.com/fmtlib/fmt/issues/878)).
- Improved documentation
([#164](https://github.com/fmtlib/fmt/issues/164),
[#877 ](https://github.com/fmtlib/fmt/issues/877 ),
[#901 ](https://github.com/fmtlib/fmt/pull/901 ),
[#906 ](https://github.com/fmtlib/fmt/pull/906 ),
[#979 ](https://github.com/fmtlib/fmt/pull/979 )). Thanks [\@kookjr
(Mathew Cucuzella)](https://github.com/kookjr), [\@DarkDimius
(Dmitry Petrashko)](https://github.com/DarkDimius),
[\@HecticSerenity ](https://github.com/HecticSerenity ).
- Added pkgconfig support which makes it easier to consume the library
from meson and other build systems
([#916](https://github.com/fmtlib/fmt/pull/916)). Thanks
[\@colemickens (Cole Mickens) ](https://github.com/colemickens ).
- Various build improvements
([#909](https://github.com/fmtlib/fmt/pull/909),
[#926 ](https://github.com/fmtlib/fmt/pull/926 ),
[#937 ](https://github.com/fmtlib/fmt/pull/937 ),
[#953 ](https://github.com/fmtlib/fmt/pull/953 ),
[#959 ](https://github.com/fmtlib/fmt/pull/959 )). Thanks [\@tchaikov
(Kefu Chai)](https://github.com/tchaikov), [\@luncliff (Park
DongHa)](https://github.com/luncliff), [\@AndreasSchoenle (Andreas
Schönle)](https://github.com/AndreasSchoenle),
[\@hotwatermorning ](https://github.com/hotwatermorning ), [\@Zefz
(JohanJansen)](https://github.com/Zefz).
- Improved `string_view` construction performance
([#914](https://github.com/fmtlib/fmt/pull/914)). Thanks [\@gabime
(Gabi Melman)](https://github.com/gabime).
- Fixed non-matching char types
([#895](https://github.com/fmtlib/fmt/pull/895)). Thanks [\@DanielaE
(Daniela Engert)](https://github.com/DanielaE).
- Fixed `format_to_n` with `std::back_insert_iterator`
([#913](https://github.com/fmtlib/fmt/pull/913)). Thanks [\@DanielaE
(Daniela Engert)](https://github.com/DanielaE).
- Fixed locale-dependent formatting
([#905](https://github.com/fmtlib/fmt/issues/905)).
- Fixed various compiler warnings and errors
([#882](https://github.com/fmtlib/fmt/pull/882),
[#886 ](https://github.com/fmtlib/fmt/pull/886 ),
[#933 ](https://github.com/fmtlib/fmt/pull/933 ),
[#941 ](https://github.com/fmtlib/fmt/pull/941 ),
[#931 ](https://github.com/fmtlib/fmt/issues/931 ),
[#943 ](https://github.com/fmtlib/fmt/pull/943 ),
[#954 ](https://github.com/fmtlib/fmt/pull/954 ),
[#956 ](https://github.com/fmtlib/fmt/pull/956 ),
[#962 ](https://github.com/fmtlib/fmt/pull/962 ),
[#965 ](https://github.com/fmtlib/fmt/issues/965 ),
[#977 ](https://github.com/fmtlib/fmt/issues/977 ),
[#983 ](https://github.com/fmtlib/fmt/pull/983 ),
[#989 ](https://github.com/fmtlib/fmt/pull/989 )). Thanks [\@Luthaf
(Guillaume Fraux)](https://github.com/Luthaf), [\@stevenhoving
(Steven Hoving)](https://github.com/stevenhoving), [\@christinaa
(Kristina Brooks)](https://github.com/christinaa), [\@lgritz (Larry
Gritz)](https://github.com/lgritz), [\@DanielaE (Daniela
Engert)](https://github.com/DanielaE), [\@0x8000-0000 (Sign
Bit)](https://github.com/0x8000-0000),
[\@liuping1997 ](https://github.com/liuping1997 ).
# 5.2.1 - 2018-09-21
- Fixed `visit` lookup issues on gcc 7 & 8
([#870](https://github.com/fmtlib/fmt/pull/870)). Thanks
[\@medithe ](https://github.com/medithe ).
- Fixed linkage errors on older gcc.
- Prevented `fmt/range.h` from specializing `fmt::basic_string_view`
([#865](https://github.com/fmtlib/fmt/issues/865),
[#868 ](https://github.com/fmtlib/fmt/pull/868 )). Thanks [\@hhggit
(dual)](https://github.com/hhggit).
- Improved error message when formatting unknown types
([#872](https://github.com/fmtlib/fmt/pull/872)). Thanks
[\@foonathan (Jonathan Müller) ](https://github.com/foonathan ),
- Disabled templated user-defined literals when compiled under nvcc
([#875](https://github.com/fmtlib/fmt/pull/875)). Thanks
[\@CandyGumdrop (Candy Gumdrop) ](https://github.com/CandyGumdrop ),
- Fixed `format_to` formatting to `wmemory_buffer`
([#874](https://github.com/fmtlib/fmt/issues/874)).
# 5.2.0 - 2018-09-13
- Optimized format string parsing and argument processing which
resulted in up to 5x speed up on long format strings and significant
performance boost on various benchmarks. For example, version 5.2 is
2.22x faster than 5.1 on decimal integer formatting with `format_to`
(macOS, clang-902.0.39.2):
+----------------------------+-----------------------+---------+
| Method | Time, s | Speedup |
+============================+=======================+=========+
| fmt::format 5.1 | > 0.58 | |
+----------------------------+-----------------------+---------+
| fmt::format 5.2 | > 0.35 0.51 | > 1.66x |
| fmt::format_to 5.1 | | |
+----------------------------+-----------------------+---------+
| fmt::format_to 5.2 sprintf | > 0.23 0.71 1.01 1.73 | > 2.22x |
| std::to_string | | |
| std::stringstream | | |
+----------------------------+-----------------------+---------+
- Changed the `fmt` macro from opt-out to opt-in to prevent name
collisions. To enable it define the `FMT_STRING_ALIAS` macro to 1
before including `fmt/format.h` :
```c++
#define FMT_STRING_ALIAS 1
#include < fmt / format . h >
std::string answer = format(fmt("{}"), 42);
```
- Added compile-time format string checks to `format_to` overload that
takes `fmt::memory_buffer`
([#783](https://github.com/fmtlib/fmt/issues/783)):
```c++
fmt::memory_buffer buf;
// Compile-time error: invalid type specifier.
fmt::format_to(buf, fmt("{:d}"), "foo");
```
- Moved experimental color support to `fmt/color.h` and enabled the
new API by default. The old API can be enabled by defining the
`FMT_DEPRECATED_COLORS` macro.
- Added formatting support for types explicitly convertible to
`fmt::string_view` :
```c++
struct foo {
explicit operator fmt::string_view() const { return "foo"; }
};
auto s = format("{}", foo());
```
In particular, this makes formatting function work with
`folly::StringPiece` .
- Implemented preliminary support for `char*_t` by replacing the
`format` function overloads with a single function template
parameterized on the string type.
- Added support for dynamic argument lists
([#814](https://github.com/fmtlib/fmt/issues/814),
[#819 ](https://github.com/fmtlib/fmt/pull/819 )). Thanks
[\@MikePopoloski (Michael
Popoloski)](https://github.com/MikePopoloski).
- Reduced executable size overhead for embedded targets using newlib
nano by making locale dependency optional
([#839](https://github.com/fmtlib/fmt/pull/839)). Thanks
[\@teajay-fr (Thomas Benard) ](https://github.com/teajay-fr ).
- Keep `noexcept` specifier when exceptions are disabled
([#801](https://github.com/fmtlib/fmt/issues/801),
[#810 ](https://github.com/fmtlib/fmt/pull/810 )). Thanks [\@qis
(Alexej Harm)](https://github.com/qis).
- Fixed formatting of user-defined types providing `operator<<` with
`format_to_n` ([#806](https://github.com/fmtlib/fmt/pull/806)).
Thanks [\@mkurdej (Marek Kurdej) ](https://github.com/mkurdej ).
- Fixed dynamic linkage of new symbols
([#808](https://github.com/fmtlib/fmt/issues/808)).
- Fixed global initialization issue
([#807](https://github.com/fmtlib/fmt/issues/807)):
```c++
// This works on compilers with constexpr support.
static const std::string answer = fmt::format("{}", 42);
```
- Fixed various compiler warnings and errors
([#804](https://github.com/fmtlib/fmt/pull/804),
[#809 ](https://github.com/fmtlib/fmt/issues/809 ),
[#811 ](https://github.com/fmtlib/fmt/pull/811 ),
[#822 ](https://github.com/fmtlib/fmt/issues/822 ),
[#827 ](https://github.com/fmtlib/fmt/pull/827 ),
[#830 ](https://github.com/fmtlib/fmt/issues/830 ),
[#838 ](https://github.com/fmtlib/fmt/pull/838 ),
[#843 ](https://github.com/fmtlib/fmt/issues/843 ),
[#844 ](https://github.com/fmtlib/fmt/pull/844 ),
[#851 ](https://github.com/fmtlib/fmt/issues/851 ),
[#852 ](https://github.com/fmtlib/fmt/pull/852 ),
[#854 ](https://github.com/fmtlib/fmt/pull/854 )). Thanks [\@henryiii
(Henry Schreiner)](https://github.com/henryiii),
[\@medithe ](https://github.com/medithe ), and [\@eliasdaler (Elias
Daler)](https://github.com/eliasdaler).
# 5.1.0 - 2018-07-05
- Added experimental support for RGB color output enabled with the
`FMT_EXTENDED_COLORS` macro:
```c++
#define FMT_EXTENDED_COLORS
#define FMT_HEADER_ONLY // or compile fmt with FMT_EXTENDED_COLORS defined
#include < fmt / format . h >
fmt::print(fmt::color::steel_blue, "Some beautiful text");
```
The old API (the `print_colored` and `vprint_colored` functions and
the `color` enum) is now deprecated.
([#762](https://github.com/fmtlib/fmt/issues/762)
[#767 ](https://github.com/fmtlib/fmt/pull/767 )). thanks [\@Remotion
(Remo)](https://github.com/Remotion).
- Added quotes to strings in ranges and tuples
([#766](https://github.com/fmtlib/fmt/pull/766)). Thanks [\@Remotion
(Remo)](https://github.com/Remotion).
- Made `format_to` work with `basic_memory_buffer`
([#776](https://github.com/fmtlib/fmt/issues/776)).
- Added `vformat_to_n` and `wchar_t` overload of `format_to_n`
([#764](https://github.com/fmtlib/fmt/issues/764),
[#769 ](https://github.com/fmtlib/fmt/issues/769 )).
- Made `is_range` and `is_tuple_like` part of public (experimental)
API to allow specialization for user-defined types
([#751](https://github.com/fmtlib/fmt/issues/751),
[#759 ](https://github.com/fmtlib/fmt/pull/759 )). Thanks [\@drrlvn
(Dror Levin)](https://github.com/drrlvn).
- Added more compilers to continuous integration and increased
`FMT_PEDANTIC` warning levels
([#736](https://github.com/fmtlib/fmt/pull/736)). Thanks
[\@eliaskosunen (Elias Kosunen) ](https://github.com/eliaskosunen ).
- Fixed compilation with MSVC 2013.
- Fixed handling of user-defined types in `format_to`
([#793](https://github.com/fmtlib/fmt/issues/793)).
- Forced linking of inline `vformat` functions into the library
([#795](https://github.com/fmtlib/fmt/issues/795)).
- Fixed incorrect call to on_align in `'{:}='`
([#750](https://github.com/fmtlib/fmt/issues/750)).
- Fixed floating-point formatting to a non-back_insert_iterator with
sign & numeric alignment specified
([#756](https://github.com/fmtlib/fmt/issues/756)).
- Fixed formatting to an array with `format_to_n`
([#778](https://github.com/fmtlib/fmt/issues/778)).
- Fixed formatting of more than 15 named arguments
([#754](https://github.com/fmtlib/fmt/issues/754)).
- Fixed handling of compile-time strings when including
`fmt/ostream.h` . ([#768](https://github.com/fmtlib/fmt/issues/768)).
- Fixed various compiler warnings and errors
([#742](https://github.com/fmtlib/fmt/issues/742),
[#748 ](https://github.com/fmtlib/fmt/issues/748 ),
[#752 ](https://github.com/fmtlib/fmt/issues/752 ),
[#770 ](https://github.com/fmtlib/fmt/issues/770 ),
[#775 ](https://github.com/fmtlib/fmt/pull/775 ),
[#779 ](https://github.com/fmtlib/fmt/issues/779 ),
[#780 ](https://github.com/fmtlib/fmt/pull/780 ),
[#790 ](https://github.com/fmtlib/fmt/pull/790 ),
[#792 ](https://github.com/fmtlib/fmt/pull/792 ),
[#800 ](https://github.com/fmtlib/fmt/pull/800 )). Thanks [\@Remotion
(Remo)](https://github.com/Remotion), [\@gabime (Gabi
Melman)](https://github.com/gabime), [\@foonathan (Jonathan
Müller)](https://github.com/foonathan), [\@Dark-Passenger (Dhruv
Paranjape)](https://github.com/Dark-Passenger), and [\@0x8000-0000
(Sign Bit)](https://github.com/0x8000-0000).
# 5.0.0 - 2018-05-21
- Added a requirement for partial C++11 support, most importantly
variadic templates and type traits, and dropped `FMT_VARIADIC_*`
emulation macros. Variadic templates are available since GCC 4.4,
Clang 2.9 and MSVC 18.0 (2013). For older compilers use {fmt}
[version 4.x ](https://github.com/fmtlib/fmt/releases/tag/4.1.0 )
which continues to be maintained and works with C++98 compilers.
- Renamed symbols to follow standard C++ naming conventions and
proposed a subset of the library for standardization in [P0645R2
Text Formatting](https://wg21.link/P0645).
- Implemented `constexpr` parsing of format strings and [compile-time
format string
checks](https://fmt.dev/latest/api.html#compile-time-format-string-checks).
For example
```c++
#include < fmt / format . h >
std::string s = format(fmt("{:d}"), "foo");
```
gives a compile-time error because `d` is an invalid specifier for
strings ([godbolt](https://godbolt.org/g/rnCy9Q)):
...
< source > :4:19: note: in instantiation of function template specialization 'fmt::v5::format< S , char [ 4 ] > ' requested here
std::string s = format(fmt("{:d}"), "foo");
^
format.h:1337:13: note: non-constexpr function 'on_error' cannot be used in a constant expression
handler.on_error("invalid type specifier");
Compile-time checks require relaxed `constexpr` (C++14 feature)
support. If the latter is not available, checks will be performed at
runtime.
- Separated format string parsing and formatting in the extension API
to enable compile-time format string processing. For example
```c++
struct Answer {};
namespace fmt {
template < >
struct formatter< Answer > {
constexpr auto parse(parse_context& ctx) {
auto it = ctx.begin();
spec = *it;
if (spec != 'd' & & spec != 's')
throw format_error("invalid specifier");
return ++it;
}
template < typename FormatContext >
auto format(Answer, FormatContext& ctx) {
return spec == 's' ?
format_to(ctx.begin(), "{}", "fourty-two") :
format_to(ctx.begin(), "{}", 42);
}
char spec = 0;
};
}
std::string s = format(fmt("{:x}"), Answer());
```
gives a compile-time error due to invalid format specifier
([godbolt](https://godbolt.org/g/2jQ1Dv)):
...
< source > :12:45: error: expression '< throw-expression > ' is not a constant expression
throw format_error("invalid specifier");
- Added [iterator
support](https://fmt.dev/latest/api.html#output-iterator-support):
```c++
#include < vector >
#include < fmt / format . h >
std::vector< char > out;
fmt::format_to(std::back_inserter(out), "{}", 42);
```
- Added the
[format_to_n ](https://fmt.dev/latest/api.html#_CPPv2N3fmt11format_to_nE8OutputItNSt6size_tE11string_viewDpRK4Args )
function that restricts the output to the specified number of
characters ([#298](https://github.com/fmtlib/fmt/issues/298)):
```c++
char out[4];
fmt::format_to_n(out, sizeof(out), "{}", 12345);
// out == "1234" (without terminating '\0')
```
- Added the
[formatted_size ](https://fmt.dev/latest/api.html#_CPPv2N3fmt14formatted_sizeE11string_viewDpRK4Args )
function for computing the output size:
```c++
#include < fmt / format . h >
auto size = fmt::formatted_size("{}", 12345); // size == 5
```
- Improved compile times by reducing dependencies on standard headers
and providing a lightweight [core
API](https://fmt.dev/latest/api.html#core-api):
```c++
#include < fmt / core . h >
fmt::print("The answer is {}.", 42);
```
See [Compile time and code
bloat](https://github.com/fmtlib/fmt#compile-time-and-code-bloat).
- Added the
[make_format_args ](https://fmt.dev/latest/api.html#_CPPv2N3fmt16make_format_argsEDpRK4Args )
function for capturing formatting arguments:
```c++
// Prints formatted error message.
void vreport_error(const char *format, fmt::format_args args) {
fmt::print("Error: ");
fmt::vprint(format, args);
}
template < typename... Args >
void report_error(const char *format, const Args & ... args) {
vreport_error(format, fmt::make_format_args(args...));
}
```
- Added the `make_printf_args` function for capturing `printf`
arguments ([#687](https://github.com/fmtlib/fmt/issues/687),
[#694 ](https://github.com/fmtlib/fmt/pull/694 )). Thanks [\@Kronuz
(Germán Méndez Bravo)](https://github.com/Kronuz).
- Added prefix `v` to non-variadic functions taking `format_args` to
distinguish them from variadic ones:
```c++
std::string vformat(string_view format_str, format_args args);
template < typename... Args >
std::string format(string_view format_str, const Args & ... args);
```
- Added experimental support for formatting ranges, containers and
tuple-like types in `fmt/ranges.h`
([#735](https://github.com/fmtlib/fmt/pull/735)):
```c++
#include < fmt / ranges . h >
std::vector< int > v = {1, 2, 3};
fmt::print("{}", v); // prints {1, 2, 3}
```
Thanks [\@Remotion (Remo) ](https://github.com/Remotion ).
- Implemented `wchar_t` date and time formatting
([#712](https://github.com/fmtlib/fmt/pull/712)):
```c++
#include < fmt / time . h >
std::time_t t = std::time(nullptr);
auto s = fmt::format(L"The date is {:%Y-%m-%d}.", *std::localtime(&t));
```
Thanks [\@DanielaE (Daniela Engert) ](https://github.com/DanielaE ).
- Provided more wide string overloads
([#724](https://github.com/fmtlib/fmt/pull/724)). Thanks [\@DanielaE
(Daniela Engert)](https://github.com/DanielaE).
- Switched from a custom null-terminated string view class to
`string_view` in the format API and provided `fmt::string_view`
which implements a subset of `std::string_view` API for pre-C++17
systems.
- Added support for `std::experimental::string_view`
([#607](https://github.com/fmtlib/fmt/pull/607)):
```c++
#include < fmt / core . h >
#include < experimental / string_view >
fmt::print("{}", std::experimental::string_view("foo"));
```
Thanks [\@virgiliofornazin (Virgilio Alexandre
Fornazin)](https://github.com/virgiliofornazin).
- Allowed mixing named and automatic arguments:
```c++
fmt::format("{} {two}", 1, fmt::arg("two", 2));
```
- Removed the write API in favor of the [format
API](https://fmt.dev/latest/api.html#format-api) with compile-time
handling of format strings.
- Disallowed formatting of multibyte strings into a wide character
target ([#606](https://github.com/fmtlib/fmt/pull/606)).
- Improved documentation
([#515](https://github.com/fmtlib/fmt/pull/515),
[#614 ](https://github.com/fmtlib/fmt/issues/614 ),
[#617 ](https://github.com/fmtlib/fmt/pull/617 ),
[#661 ](https://github.com/fmtlib/fmt/pull/661 ),
[#680 ](https://github.com/fmtlib/fmt/pull/680 )). Thanks [\@ibell
(Ian Bell)](https://github.com/ibell), [\@mihaitodor (Mihai
Todor)](https://github.com/mihaitodor), and
[\@johnthagen ](https://github.com/johnthagen ).
- Implemented more efficient handling of large number of format
arguments.
- Introduced an inline namespace for symbol versioning.
- Added debug postfix `d` to the `fmt` library name
([#636](https://github.com/fmtlib/fmt/issues/636)).
- Removed unnecessary `fmt/` prefix in includes
([#397](https://github.com/fmtlib/fmt/pull/397)). Thanks
[\@chronoxor (Ivan Shynkarenka) ](https://github.com/chronoxor ).
- Moved `fmt/*.h` to `include/fmt/*.h` to prevent irrelevant files and
directories appearing on the include search paths when fmt is used
as a subproject and moved source files to the `src` directory.
- Added qmake project file `support/fmt.pro`
([#641](https://github.com/fmtlib/fmt/pull/641)). Thanks [\@cowo78
(Giuseppe Corbelli)](https://github.com/cowo78).
- Added Gradle build file `support/build.gradle`
([#649](https://github.com/fmtlib/fmt/pull/649)). Thanks [\@luncliff
(Park DongHa)](https://github.com/luncliff).
- Removed `FMT_CPPFORMAT` CMake option.
- Fixed a name conflict with the macro `CHAR_WIDTH` in glibc
([#616](https://github.com/fmtlib/fmt/pull/616)). Thanks [\@aroig
(Abdó Roig-Maranges)](https://github.com/aroig).
- Fixed handling of nested braces in `fmt::join`
([#638](https://github.com/fmtlib/fmt/issues/638)).
- Added `SOURCELINK_SUFFIX` for compatibility with Sphinx 1.5
([#497](https://github.com/fmtlib/fmt/pull/497)). Thanks [\@ginggs
(Graham Inggs)](https://github.com/ginggs).
- Added a missing `inline` in the header-only mode
([#626](https://github.com/fmtlib/fmt/pull/626)). Thanks [\@aroig
(Abdó Roig-Maranges)](https://github.com/aroig).
- Fixed various compiler warnings
([#640](https://github.com/fmtlib/fmt/pull/640),
[#656 ](https://github.com/fmtlib/fmt/pull/656 ),
[#679 ](https://github.com/fmtlib/fmt/pull/679 ),
[#681 ](https://github.com/fmtlib/fmt/pull/681 ),
[#705 ](https://github.com/fmtlib/fmt/pull/705 ),
[#715 ](https://github.com/fmtlib/fmt/issues/715 ),
[#717 ](https://github.com/fmtlib/fmt/pull/717 ),
[#720 ](https://github.com/fmtlib/fmt/pull/720 ),
[#723 ](https://github.com/fmtlib/fmt/pull/723 ),
[#726 ](https://github.com/fmtlib/fmt/pull/726 ),
[#730 ](https://github.com/fmtlib/fmt/pull/730 ),
[#739 ](https://github.com/fmtlib/fmt/pull/739 )). Thanks
[\@peterbell10 ](https://github.com/peterbell10 ),
[\@LarsGullik ](https://github.com/LarsGullik ), [\@foonathan
(Jonathan Müller)](https://github.com/foonathan), [\@eliaskosunen
(Elias Kosunen)](https://github.com/eliaskosunen),
[\@christianparpart (Christian
Parpart)](https://github.com/christianparpart), [\@DanielaE (Daniela
Engert)](https://github.com/DanielaE), and
[\@mwinterb ](https://github.com/mwinterb ).
- Worked around an MSVC bug and fixed several warnings
([#653](https://github.com/fmtlib/fmt/pull/653)). Thanks
[\@alabuzhev (Alex Alabuzhev) ](https://github.com/alabuzhev ).
- Worked around GCC bug 67371
([#682](https://github.com/fmtlib/fmt/issues/682)).
- Fixed compilation with `-fno-exceptions`
([#655](https://github.com/fmtlib/fmt/pull/655)). Thanks
[\@chenxiaolong (Andrew
Gunnerson)](https://github.com/chenxiaolong).
- Made `constexpr remove_prefix` gcc version check tighter
([#648](https://github.com/fmtlib/fmt/issues/648)).
- Renamed internal type enum constants to prevent collision with
poorly written C libraries
([#644](https://github.com/fmtlib/fmt/issues/644)).
- Added detection of `wostream operator<<`
([#650](https://github.com/fmtlib/fmt/issues/650)).
- Fixed compilation on OpenBSD
([#660](https://github.com/fmtlib/fmt/pull/660)). Thanks
[\@hubslave ](https://github.com/hubslave ).
- Fixed compilation on FreeBSD 12
([#732](https://github.com/fmtlib/fmt/pull/732)). Thanks
[\@dankm ](https://github.com/dankm ).
- Fixed compilation when there is a mismatch between `-std` options
between the library and user code
([#664](https://github.com/fmtlib/fmt/issues/664)).
- Fixed compilation with GCC 7 and `-std=c++11`
([#734](https://github.com/fmtlib/fmt/issues/734)).
- Improved generated binary code on GCC 7 and older
([#668](https://github.com/fmtlib/fmt/issues/668)).
- Fixed handling of numeric alignment with no width
([#675](https://github.com/fmtlib/fmt/issues/675)).
- Fixed handling of empty strings in UTF8/16 converters
([#676](https://github.com/fmtlib/fmt/pull/676)). Thanks
[\@vgalka-sl (Vasili Galka) ](https://github.com/vgalka-sl ).
- Fixed formatting of an empty `string_view`
([#689](https://github.com/fmtlib/fmt/issues/689)).
- Fixed detection of `string_view` on libc++
([#686](https://github.com/fmtlib/fmt/issues/686)).
- Fixed DLL issues ([#696](https://github.com/fmtlib/fmt/pull/696)).
Thanks [\@sebkoenig ](https://github.com/sebkoenig ).
- Fixed compile checks for mixing narrow and wide strings
([#690](https://github.com/fmtlib/fmt/issues/690)).
- Disabled unsafe implicit conversion to `std::string`
([#729](https://github.com/fmtlib/fmt/issues/729)).
- Fixed handling of reused format specs (as in `fmt::join` ) for
pointers ([#725](https://github.com/fmtlib/fmt/pull/725)). Thanks
[\@mwinterb ](https://github.com/mwinterb ).
- Fixed installation of `fmt/ranges.h`
([#738](https://github.com/fmtlib/fmt/pull/738)). Thanks
[\@sv1990 ](https://github.com/sv1990 ).
# 4.1.0 - 2017-12-20
- Added `fmt::to_wstring()` in addition to `fmt::to_string()`
([#559](https://github.com/fmtlib/fmt/pull/559)). Thanks
[\@alabuzhev (Alex Alabuzhev) ](https://github.com/alabuzhev ).
- Added support for C++17 `std::string_view`
([#571](https://github.com/fmtlib/fmt/pull/571) and
[#578 ](https://github.com/fmtlib/fmt/pull/578 )). Thanks [\@thelostt
(Mário Feroldi)](https://github.com/thelostt) and
[\@mwinterb ](https://github.com/mwinterb ).
- Enabled stream exceptions to catch errors
([#581](https://github.com/fmtlib/fmt/issues/581)). Thanks
[\@crusader-mike ](https://github.com/crusader-mike ).
- Allowed formatting of class hierarchies with `fmt::format_arg()`
([#547](https://github.com/fmtlib/fmt/pull/547)). Thanks [\@rollbear
(Björn Fahller)](https://github.com/rollbear).
- Removed limitations on character types
([#563](https://github.com/fmtlib/fmt/pull/563)). Thanks
[\@Yelnats321 (Elnar Dakeshov) ](https://github.com/Yelnats321 ).
- Conditionally enabled use of `std::allocator_traits`
([#583](https://github.com/fmtlib/fmt/pull/583)). Thanks
[\@mwinterb ](https://github.com/mwinterb ).
- Added support for `const` variadic member function emulation with
`FMT_VARIADIC_CONST`
([#591](https://github.com/fmtlib/fmt/pull/591)). Thanks
[\@ludekvodicka (Ludek Vodicka) ](https://github.com/ludekvodicka ).
- Various bugfixes: bad overflow check, unsupported implicit type
conversion when determining formatting function, test segfaults
([#551](https://github.com/fmtlib/fmt/issues/551)), ill-formed
macros ([#542](https://github.com/fmtlib/fmt/pull/542)) and
ambiguous overloads
([#580](https://github.com/fmtlib/fmt/issues/580)). Thanks
[\@xylosper (Byoung-young Lee) ](https://github.com/xylosper ).
- Prevented warnings on MSVC
([#605](https://github.com/fmtlib/fmt/pull/605),
[#602 ](https://github.com/fmtlib/fmt/pull/602 ), and
[#545 ](https://github.com/fmtlib/fmt/pull/545 )), clang
([#582](https://github.com/fmtlib/fmt/pull/582)), GCC
([#573](https://github.com/fmtlib/fmt/issues/573)), various
conversion warnings ([#609](https://github.com/fmtlib/fmt/pull/609),
[#567 ](https://github.com/fmtlib/fmt/pull/567 ),
[#553 ](https://github.com/fmtlib/fmt/pull/553 ) and
[#553 ](https://github.com/fmtlib/fmt/pull/553 )), and added
`override` and `[[noreturn]]`
([#549](https://github.com/fmtlib/fmt/pull/549) and
[#555 ](https://github.com/fmtlib/fmt/issues/555 )). Thanks
[\@alabuzhev (Alex Alabuzhev) ](https://github.com/alabuzhev ),
[\@virgiliofornazin (Virgilio Alexandre
Fornazin)](https://gihtub.com/virgiliofornazin), [\@alexanderbock
(Alexander Bock)](https://github.com/alexanderbock),
[\@yumetodo ](https://github.com/yumetodo ), [\@VaderY (Császár
Mátyás)](https://github.com/VaderY), [\@jpcima (JP
Cimalando)](https://github.com/jpcima), [\@thelostt (Mário
Feroldi)](https://github.com/thelostt), and [\@Manu343726 (Manu
Sánchez)](https://github.com/Manu343726).
- Improved CMake: Used `GNUInstallDirs` to set installation location
([#610](https://github.com/fmtlib/fmt/pull/610)) and fixed warnings
([#536](https://github.com/fmtlib/fmt/pull/536) and
[#556 ](https://github.com/fmtlib/fmt/pull/556 )). Thanks [\@mikecrowe
(Mike Crowe)](https://github.com/mikecrowe),
[\@evgen231 ](https://github.com/evgen231 ) and [\@henryiii (Henry
Schreiner)](https://github.com/henryiii).
# 4.0.0 - 2017-06-27
- Removed old compatibility headers `cppformat/*.h` and CMake options
([#527](https://github.com/fmtlib/fmt/pull/527)). Thanks
[\@maddinat0r (Alex Martin) ](https://github.com/maddinat0r ).
- Added `string.h` containing `fmt::to_string()` as alternative to
`std::to_string()` as well as other string writer functionality
([#326](https://github.com/fmtlib/fmt/issues/326) and
[#441 ](https://github.com/fmtlib/fmt/pull/441 )):
```c++
#include "fmt/string.h"
std::string answer = fmt::to_string(42);
```
Thanks to [\@glebov-andrey (Andrey
Glebov)](https://github.com/glebov-andrey).
- Moved `fmt::printf()` to new `printf.h` header and allowed `%s` as
generic specifier ([#453](https://github.com/fmtlib/fmt/pull/453)),
made `%.f` more conformant to regular `printf()`
([#490](https://github.com/fmtlib/fmt/pull/490)), added custom
writer support ([#476](https://github.com/fmtlib/fmt/issues/476))
and implemented missing custom argument formatting
([#339](https://github.com/fmtlib/fmt/pull/339) and
[#340 ](https://github.com/fmtlib/fmt/pull/340 )):
```c++
#include "fmt/printf.h"
// %s format specifier can be used with any argument type.
fmt::printf("%s", 42);
```
Thanks [\@mojoBrendan ](https://github.com/mojoBrendan ),
[\@manylegged (Arthur Danskin) ](https://github.com/manylegged ) and
[\@spacemoose (Glen Stark) ](https://github.com/spacemoose ). See also
[#360 ](https://github.com/fmtlib/fmt/issues/360 ),
[#335 ](https://github.com/fmtlib/fmt/issues/335 ) and
[#331 ](https://github.com/fmtlib/fmt/issues/331 ).
- Added `container.h` containing a `BasicContainerWriter` to write to
containers like `std::vector`
([#450](https://github.com/fmtlib/fmt/pull/450)). Thanks
[\@polyvertex (Jean-Charles
Lefebvre)](https://github.com/polyvertex).
- Added `fmt::join()` function that takes a range and formats its
elements separated by a given string
([#466](https://github.com/fmtlib/fmt/pull/466)):
```c++
#include "fmt/format.h"
std::vector< double > v = {1.2, 3.4, 5.6};
// Prints "(+01.20, +03.40, +05.60)".
fmt::print("({:+06.2f})", fmt::join(v.begin(), v.end(), ", "));
```
Thanks [\@olivier80 ](https://github.com/olivier80 ).
- Added support for custom formatting specifications to simplify
customization of built-in formatting
([#444](https://github.com/fmtlib/fmt/pull/444)). Thanks
[\@polyvertex (Jean-Charles
Lefebvre)](https://github.com/polyvertex). See also
[#439 ](https://github.com/fmtlib/fmt/issues/439 ).
- Added `fmt::format_system_error()` for error code formatting
([#323](https://github.com/fmtlib/fmt/issues/323) and
[#526 ](https://github.com/fmtlib/fmt/pull/526 )). Thanks
[\@maddinat0r (Alex Martin) ](https://github.com/maddinat0r ).
- Added thread-safe `fmt::localtime()` and `fmt::gmtime()` as
replacement for the standard version to `time.h`
([#396](https://github.com/fmtlib/fmt/pull/396)). Thanks
[\@codicodi ](https://github.com/codicodi ).
- Internal improvements to `NamedArg` and `ArgLists`
([#389](https://github.com/fmtlib/fmt/pull/389) and
[#390 ](https://github.com/fmtlib/fmt/pull/390 )). Thanks
[\@chronoxor ](https://github.com/chronoxor ).
- Fixed crash due to bug in `FormatBuf`
([#493](https://github.com/fmtlib/fmt/pull/493)). Thanks
[\@effzeh ](https://github.com/effzeh ). See also
[#480 ](https://github.com/fmtlib/fmt/issues/480 ) and
[#491 ](https://github.com/fmtlib/fmt/issues/491 ).
- Fixed handling of wide strings in `fmt::StringWriter` .
- Improved compiler error messages
([#357](https://github.com/fmtlib/fmt/issues/357)).
- Fixed various warnings and issues with various compilers
([#494](https://github.com/fmtlib/fmt/pull/494),
[#499 ](https://github.com/fmtlib/fmt/pull/499 ),
[#483 ](https://github.com/fmtlib/fmt/pull/483 ),
[#485 ](https://github.com/fmtlib/fmt/pull/485 ),
[#482 ](https://github.com/fmtlib/fmt/pull/482 ),
[#475 ](https://github.com/fmtlib/fmt/pull/475 ),
[#473 ](https://github.com/fmtlib/fmt/pull/473 ) and
[#414 ](https://github.com/fmtlib/fmt/pull/414 )). Thanks
[\@chronoxor ](https://github.com/chronoxor ),
[\@zhaohuaxishi ](https://github.com/zhaohuaxishi ), [\@pkestene
(Pierre Kestener)](https://github.com/pkestene), [\@dschmidt
(Dominik Schmidt)](https://github.com/dschmidt) and [\@0x414c
(Alexey Gorishny)](https://github.com/0x414c) .
- Improved CMake: targets are now namespaced
([#511](https://github.com/fmtlib/fmt/pull/511) and
[#513 ](https://github.com/fmtlib/fmt/pull/513 )), supported
header-only `printf.h`
([#354](https://github.com/fmtlib/fmt/pull/354)), fixed issue with
minimal supported library subset
([#418](https://github.com/fmtlib/fmt/issues/418),
[#419 ](https://github.com/fmtlib/fmt/pull/419 ) and
[#420 ](https://github.com/fmtlib/fmt/pull/420 )). Thanks
[\@bjoernthiel (Bjoern Thiel) ](https://github.com/bjoernthiel ),
[\@niosHD (Mario Werner) ](https://github.com/niosHD ),
[\@LogicalKnight (Sean LK) ](https://github.com/LogicalKnight ) and
[\@alabuzhev (Alex Alabuzhev) ](https://github.com/alabuzhev ).
- Improved documentation. Thanks to [\@pwm1234
(Phil)](https://github.com/pwm1234) for
[#393 ](https://github.com/fmtlib/fmt/pull/393 ).
# 3.0.2 - 2017-06-14
- Added `FMT_VERSION` macro
([#411](https://github.com/fmtlib/fmt/issues/411)).
- Used `FMT_NULL` instead of literal `0`
([#409](https://github.com/fmtlib/fmt/pull/409)). Thanks
[\@alabuzhev (Alex Alabuzhev) ](https://github.com/alabuzhev ).
- Added extern templates for `format_float`
([#413](https://github.com/fmtlib/fmt/issues/413)).
- Fixed implicit conversion issue
([#507](https://github.com/fmtlib/fmt/issues/507)).
- Fixed signbit detection
([#423](https://github.com/fmtlib/fmt/issues/423)).
- Fixed naming collision
([#425](https://github.com/fmtlib/fmt/issues/425)).
- Fixed missing intrinsic for C++/CLI
([#457](https://github.com/fmtlib/fmt/pull/457)). Thanks [\@calumr
(Calum Robinson)](https://github.com/calumr)
- Fixed Android detection
([#458](https://github.com/fmtlib/fmt/pull/458)). Thanks [\@Gachapen
(Magnus Bjerke Vik)](https://github.com/Gachapen).
- Use lean `windows.h` if not in header-only mode
([#503](https://github.com/fmtlib/fmt/pull/503)). Thanks
[\@Quentin01 (Quentin Buathier) ](https://github.com/Quentin01 ).
- Fixed issue with CMake exporting C++11 flag
([#445](https://github.com/fmtlib/fmt/pull/455)). Thanks [\@EricWF
(Eric)](https://github.com/EricWF).
- Fixed issue with nvcc and MSVC compiler bug and MinGW
([#505](https://github.com/fmtlib/fmt/issues/505)).
- Fixed DLL issues ([#469](https://github.com/fmtlib/fmt/pull/469) and
[#502 ](https://github.com/fmtlib/fmt/pull/502 )). Thanks
[\@richardeakin (Richard Eakin) ](https://github.com/richardeakin )
and [\@AndreasSchoenle (Andreas
Schönle)](https://github.com/AndreasSchoenle).
- Fixed test compilation under FreeBSD
([#433](https://github.com/fmtlib/fmt/issues/433)).
- Fixed various warnings
([#403](https://github.com/fmtlib/fmt/pull/403),
[#410 ](https://github.com/fmtlib/fmt/pull/410 ) and
[#510 ](https://github.com/fmtlib/fmt/pull/510 )). Thanks
[\@Lecetem ](https://github.com/Lectem ), [\@chenhayat (Chen
Hayat)](https://github.com/chenhayat) and
[\@trozen ](https://github.com/trozen ).
- Worked around a broken `__builtin_clz` in clang with MS codegen
([#519](https://github.com/fmtlib/fmt/issues/519)).
- Removed redundant include
([#479](https://github.com/fmtlib/fmt/issues/479)).
- Fixed documentation issues.
# 3.0.1 - 2016-11-01
- Fixed handling of thousands separator
([#353](https://github.com/fmtlib/fmt/issues/353)).
- Fixed handling of `unsigned char` strings
([#373](https://github.com/fmtlib/fmt/issues/373)).
- Corrected buffer growth when formatting time
([#367](https://github.com/fmtlib/fmt/issues/367)).
- Removed warnings under MSVC and clang
([#318](https://github.com/fmtlib/fmt/issues/318),
[#250 ](https://github.com/fmtlib/fmt/issues/250 ), also merged
[#385 ](https://github.com/fmtlib/fmt/pull/385 ) and
[#361 ](https://github.com/fmtlib/fmt/pull/361 )). Thanks [\@jcelerier
(Jean-Michaël Celerier)](https://github.com/jcelerier) and
[\@nmoehrle (Nils Moehrle) ](https://github.com/nmoehrle ).
- Fixed compilation issues under Android
([#327](https://github.com/fmtlib/fmt/pull/327),
[#345 ](https://github.com/fmtlib/fmt/issues/345 ) and
[#381 ](https://github.com/fmtlib/fmt/pull/381 )), FreeBSD
([#358](https://github.com/fmtlib/fmt/pull/358)), Cygwin
([#388](https://github.com/fmtlib/fmt/issues/388)), MinGW
([#355](https://github.com/fmtlib/fmt/issues/355)) as well as other
issues ([#350](https://github.com/fmtlib/fmt/issues/350),
[#366 ](https://github.com/fmtlib/fmt/issues/355 ),
[#348 ](https://github.com/fmtlib/fmt/pull/348 ),
[#402 ](https://github.com/fmtlib/fmt/pull/402 ),
[#405 ](https://github.com/fmtlib/fmt/pull/405 )). Thanks to
[\@dpantele (Dmitry) ](https://github.com/dpantele ), [\@hghwng (Hugh
Wang)](https://github.com/hghwng), [\@arvedarved (Tilman
Keskinöz)](https://github.com/arvedarved), [\@LogicalKnight
(Sean)](https://github.com/LogicalKnight) and [\@JanHellwig (Jan
Hellwig)](https://github.com/janhellwig).
- Fixed some documentation issues and extended specification
([#320](https://github.com/fmtlib/fmt/issues/320),
[#333 ](https://github.com/fmtlib/fmt/pull/333 ),
[#347 ](https://github.com/fmtlib/fmt/issues/347 ),
[#362 ](https://github.com/fmtlib/fmt/pull/362 )). Thanks to
[\@smellman (Taro Matsuzawa aka. btm) ](https://github.com/smellman ).
# 3.0.0 - 2016-05-07
- The project has been renamed from C++ Format (cppformat) to fmt for
consistency with the used namespace and macro prefix
([#307](https://github.com/fmtlib/fmt/issues/307)). Library headers
are now located in the `fmt` directory:
```c++
#include "fmt/format.h"
```
Including `format.h` from the `cppformat` directory is deprecated
but works via a proxy header which will be removed in the next major
version.
The documentation is now available at < https: / / fmt . dev > .
- Added support for
[strftime ](http://en.cppreference.com/w/cpp/chrono/c/strftime )-like
[date and time
formatting](https://fmt.dev/3.0.0/api.html#date-and-time-formatting)
([#283](https://github.com/fmtlib/fmt/issues/283)):
```c++
#include "fmt/time.h"
std::time_t t = std::time(nullptr);
// Prints "The date is 2016-04-29." (with the current date)
fmt::print("The date is {:%Y-%m-%d}.", *std::localtime(&t));
```
- `std::ostream` support including formatting of user-defined types
that provide overloaded `operator<<` has been moved to
`fmt/ostream.h` :
```c++
#include "fmt/ostream.h"
class Date {
int year_, month_, day_;
public:
Date(int year, int month, int day) : year_(year), month_(month), day_(day) {}
friend std::ostream & operator< < (std::ostream & os, const Date & d) {
return os < < d.year_ < < ' - ' < < d . month_ < < ' - ' < < d . day_ ;
}
};
std::string s = fmt::format("The date is {}", Date(2012, 12, 9));
// s == "The date is 2012-12-9"
```
- Added support for [custom argument
formatters](https://fmt.dev/3.0.0/api.html#argument-formatters)
([#235](https://github.com/fmtlib/fmt/issues/235)).
- Added support for locale-specific integer formatting with the `n`
specifier ([#305](https://github.com/fmtlib/fmt/issues/305)):
```c++
std::setlocale(LC_ALL, "en_US.utf8");
fmt::print("cppformat: {:n}\n", 1234567); // prints 1,234,567
```
- Sign is now preserved when formatting an integer with an incorrect
`printf` format specifier
([#265](https://github.com/fmtlib/fmt/issues/265)):
```c++
fmt::printf("%lld", -42); // prints -42
```
Note that it would be an undefined behavior in `std::printf` .
- Length modifiers such as `ll` are now optional in printf formatting
functions and the correct type is determined automatically
([#255](https://github.com/fmtlib/fmt/issues/255)):
```c++
fmt::printf("%d", std::numeric_limits< long long > ::max());
```
Note that it would be an undefined behavior in `std::printf` .
- Added initial support for custom formatters
([#231](https://github.com/fmtlib/fmt/issues/231)).
- Fixed detection of user-defined literal support on Intel C++
compiler ([#311](https://github.com/fmtlib/fmt/issues/311),
[#312 ](https://github.com/fmtlib/fmt/pull/312 )). Thanks to
[\@dean0x7d (Dean Moldovan) ](https://github.com/dean0x7d ) and
[\@speth (Ray Speth) ](https://github.com/speth ).
- Reduced compile time
([#243](https://github.com/fmtlib/fmt/pull/243),
[#249 ](https://github.com/fmtlib/fmt/pull/249 ),
[#317 ](https://github.com/fmtlib/fmt/issues/317 )):
2023-09-04 14:59:30 +00:00
2023-09-04 14:07:24 +00:00
2023-09-04 14:59:30 +00:00
2023-09-04 14:07:24 +00:00
Thanks to [\@dean0x7d (Dean Moldovan) ](https://github.com/dean0x7d ).
- Compile test fixes ([#313](https://github.com/fmtlib/fmt/pull/313)).
Thanks to [\@dean0x7d (Dean Moldovan) ](https://github.com/dean0x7d ).
- Documentation fixes ([#239](https://github.com/fmtlib/fmt/pull/239),
[#248 ](https://github.com/fmtlib/fmt/issues/248 ),
[#252 ](https://github.com/fmtlib/fmt/issues/252 ),
[#258 ](https://github.com/fmtlib/fmt/pull/258 ),
[#260 ](https://github.com/fmtlib/fmt/issues/260 ),
[#301 ](https://github.com/fmtlib/fmt/issues/301 ),
[#309 ](https://github.com/fmtlib/fmt/pull/309 )). Thanks to
[\@ReadmeCritic ](https://github.com/ReadmeCritic ) [\@Gachapen
(Magnus Bjerke Vik)](https://github.com/Gachapen) and [\@jwilk
(Jakub Wilk)](https://github.com/jwilk).
- Fixed compiler and sanitizer warnings
([#244](https://github.com/fmtlib/fmt/issues/244),
[#256 ](https://github.com/fmtlib/fmt/pull/256 ),
[#259 ](https://github.com/fmtlib/fmt/pull/259 ),
[#263 ](https://github.com/fmtlib/fmt/issues/263 ),
[#274 ](https://github.com/fmtlib/fmt/issues/274 ),
[#277 ](https://github.com/fmtlib/fmt/pull/277 ),
[#286 ](https://github.com/fmtlib/fmt/pull/286 ),
[#291 ](https://github.com/fmtlib/fmt/issues/291 ),
[#296 ](https://github.com/fmtlib/fmt/issues/296 ),
[#308 ](https://github.com/fmtlib/fmt/issues/308 )) Thanks to
[\@mwinterb ](https://github.com/mwinterb ), [\@pweiskircher (Patrik
Weiskircher)](https://github.com/pweiskircher),
[\@Naios ](https://github.com/Naios ).
- Improved compatibility with Windows Store apps
([#280](https://github.com/fmtlib/fmt/issues/280),
[#285 ](https://github.com/fmtlib/fmt/pull/285 )) Thanks to
[\@mwinterb ](https://github.com/mwinterb ).
- Added tests of compatibility with older C++ standards
([#273](https://github.com/fmtlib/fmt/pull/273)). Thanks to
[\@niosHD ](https://github.com/niosHD ).
- Fixed Android build
([#271](https://github.com/fmtlib/fmt/pull/271)). Thanks to
[\@newnon ](https://github.com/newnon ).
- Changed `ArgMap` to be backed by a vector instead of a map.
([#261](https://github.com/fmtlib/fmt/issues/261),
[#262 ](https://github.com/fmtlib/fmt/pull/262 )). Thanks to
[\@mwinterb ](https://github.com/mwinterb ).
- Added `fprintf` overload that writes to a `std::ostream`
([#251](https://github.com/fmtlib/fmt/pull/251)). Thanks to
[nickhutchinson (Nicholas
Hutchinson)](https://github.com/nickhutchinson).
- Export symbols when building a Windows DLL
([#245](https://github.com/fmtlib/fmt/pull/245)). Thanks to [macdems
(Maciek Dems)](https://github.com/macdems).
- Fixed compilation on Cygwin
([#304](https://github.com/fmtlib/fmt/issues/304)).
- Implemented a workaround for a bug in Apple LLVM version 4.2 of
clang ([#276](https://github.com/fmtlib/fmt/issues/276)).
- Implemented a workaround for Google Test bug
[#705 ](https://github.com/google/googletest/issues/705 ) on gcc 6
([#268](https://github.com/fmtlib/fmt/issues/268)). Thanks to
[octoploid ](https://github.com/octoploid ).
- Removed Biicode support because the latter has been discontinued.
# 2.1.1 - 2016-04-11
- The install location for generated CMake files is now configurable
via the `FMT_CMAKE_DIR` CMake variable
([#299](https://github.com/fmtlib/fmt/pull/299)). Thanks to
[\@niosHD ](https://github.com/niosHD ).
- Documentation fixes
([#252](https://github.com/fmtlib/fmt/issues/252)).
# 2.1.0 - 2016-03-21
- Project layout and build system improvements
([#267](https://github.com/fmtlib/fmt/pull/267)):
- The code have been moved to the `cppformat` directory. Including
`format.h` from the top-level directory is deprecated but works
via a proxy header which will be removed in the next major
version.
- C++ Format CMake targets now have proper interface definitions.
- Installed version of the library now supports the header-only
configuration.
- Targets `doc` , `install` , and `test` are now disabled if C++
Format is included as a CMake subproject. They can be enabled by
setting `FMT_DOC` , `FMT_INSTALL` , and `FMT_TEST` in the parent
project.
Thanks to [\@niosHD ](https://github.com/niosHD ).
# 2.0.1 - 2016-03-13
- Improved CMake find and package support
([#264](https://github.com/fmtlib/fmt/issues/264)). Thanks to
[\@niosHD ](https://github.com/niosHD ).
- Fix compile error with Android NDK and mingw32
([#241](https://github.com/fmtlib/fmt/issues/241)). Thanks to
[\@Gachapen (Magnus Bjerke Vik) ](https://github.com/Gachapen ).
- Documentation fixes
([#248](https://github.com/fmtlib/fmt/issues/248),
[#260 ](https://github.com/fmtlib/fmt/issues/260 )).
# 2.0.0 - 2015-12-01
## General
- \[Breaking\] Named arguments
([#169](https://github.com/fmtlib/fmt/pull/169),
[#173 ](https://github.com/fmtlib/fmt/pull/173 ),
[#174 ](https://github.com/fmtlib/fmt/pull/174 )):
```c++
fmt::print("The answer is {answer}.", fmt::arg("answer", 42));
```
Thanks to [\@jamboree ](https://github.com/jamboree ).
- \[Experimental\] User-defined literals for format and named
arguments ([#204](https://github.com/fmtlib/fmt/pull/204),
[#206 ](https://github.com/fmtlib/fmt/pull/206 ),
[#207 ](https://github.com/fmtlib/fmt/pull/207 )):
```c++
using namespace fmt::literals;
fmt::print("The answer is {answer}.", "answer"_a=42);
```
Thanks to [\@dean0x7d (Dean Moldovan) ](https://github.com/dean0x7d ).
- \[Breaking\] Formatting of more than 16 arguments is now supported
when using variadic templates
([#141](https://github.com/fmtlib/fmt/issues/141)). Thanks to
[\@Shauren ](https://github.com/Shauren ).
- Runtime width specification
([#168](https://github.com/fmtlib/fmt/pull/168)):
```c++
fmt::format("{0:{1}}", 42, 5); // gives " 42"
```
Thanks to [\@jamboree ](https://github.com/jamboree ).
- \[Breaking\] Enums are now formatted with an overloaded
`std::ostream` insertion operator (`operator<< `) if available
([#232](https://github.com/fmtlib/fmt/issues/232)).
- \[Breaking\] Changed default `bool` format to textual, \"true\" or
\"false\" ([#170](https://github.com/fmtlib/fmt/issues/170)):
```c++
fmt::print("{}", true); // prints "true"
```
To print `bool` as a number use numeric format specifier such as
`d` :
```c++
fmt::print("{:d}", true); // prints "1"
```
- `fmt::printf` and `fmt::sprintf` now support formatting of `bool`
with the `%s` specifier giving textual output, \"true\" or \"false\"
([#223](https://github.com/fmtlib/fmt/pull/223)):
```c++
fmt::printf("%s", true); // prints "true"
```
Thanks to [\@LarsGullik ](https://github.com/LarsGullik ).
- \[Breaking\] `signed char` and `unsigned char` are now formatted as
integers by default
([#217](https://github.com/fmtlib/fmt/pull/217)).
- \[Breaking\] Pointers to C strings can now be formatted with the `p`
specifier ([#223](https://github.com/fmtlib/fmt/pull/223)):
```c++
fmt::print("{:p}", "test"); // prints pointer value
```
Thanks to [\@LarsGullik ](https://github.com/LarsGullik ).
- \[Breaking\] `fmt::printf` and `fmt::sprintf` now print null
pointers as `(nil)` and null strings as `(null)` for consistency
with glibc ([#226](https://github.com/fmtlib/fmt/pull/226)). Thanks
to [\@LarsGullik ](https://github.com/LarsGullik ).
- \[Breaking\] `fmt::(s)printf` now supports formatting of objects of
user-defined types that provide an overloaded `std::ostream`
insertion operator (`operator< < `)
([#201](https://github.com/fmtlib/fmt/issues/201)):
```c++
fmt::printf("The date is %s", Date(2012, 12, 9));
```
- \[Breaking\] The `Buffer` template is now part of the public API and
can be used to implement custom memory buffers
([#140](https://github.com/fmtlib/fmt/issues/140)). Thanks to
[\@polyvertex (Jean-Charles
Lefebvre)](https://github.com/polyvertex).
- \[Breaking\] Improved compatibility between `BasicStringRef` and
[std::experimental::basic_string_view ](http://en.cppreference.com/w/cpp/experimental/basic_string_view )
([#100](https://github.com/fmtlib/fmt/issues/100),
[#159 ](https://github.com/fmtlib/fmt/issues/159 ),
[#183 ](https://github.com/fmtlib/fmt/issues/183 )):
- Comparison operators now compare string content, not pointers
- `BasicStringRef::c_str` replaced by `BasicStringRef::data`
- `BasicStringRef` is no longer assumed to be null-terminated
References to null-terminated strings are now represented by a new
class, `BasicCStringRef` .
- Dependency on pthreads introduced by Google Test is now optional
([#185](https://github.com/fmtlib/fmt/issues/185)).
- New CMake options `FMT_DOC` , `FMT_INSTALL` and `FMT_TEST` to control
generation of `doc` , `install` and `test` targets respectively, on
by default ([#197](https://github.com/fmtlib/fmt/issues/197),
[#198 ](https://github.com/fmtlib/fmt/issues/198 ),
[#200 ](https://github.com/fmtlib/fmt/issues/200 )). Thanks to
[\@maddinat0r (Alex Martin) ](https://github.com/maddinat0r ).
- `noexcept` is now used when compiling with MSVC2015
([#215](https://github.com/fmtlib/fmt/pull/215)). Thanks to
[\@dmkrepo (Dmitriy) ](https://github.com/dmkrepo ).
- Added an option to disable use of `windows.h` when
`FMT_USE_WINDOWS_H` is defined as 0 before including `format.h`
([#171](https://github.com/fmtlib/fmt/issues/171)). Thanks to
[\@alfps (Alf P. Steinbach) ](https://github.com/alfps ).
- \[Breaking\] `windows.h` is now included with `NOMINMAX` unless
`FMT_WIN_MINMAX` is defined. This is done to prevent breaking code
using `std::min` and `std::max` and only affects the header-only
configuration ([#152](https://github.com/fmtlib/fmt/issues/152),
[#153 ](https://github.com/fmtlib/fmt/pull/153 ),
[#154 ](https://github.com/fmtlib/fmt/pull/154 )). Thanks to
[\@DevO2012 ](https://github.com/DevO2012 ).
- Improved support for custom character types
([#171](https://github.com/fmtlib/fmt/issues/171)). Thanks to
[\@alfps (Alf P. Steinbach) ](https://github.com/alfps ).
- Added an option to disable use of IOStreams when `FMT_USE_IOSTREAMS`
is defined as 0 before including `format.h`
([#205](https://github.com/fmtlib/fmt/issues/205),
[#208 ](https://github.com/fmtlib/fmt/pull/208 )). Thanks to
[\@JodiTheTigger ](https://github.com/JodiTheTigger ).
- Improved detection of `isnan` , `isinf` and `signbit` .
## Optimization
- Made formatting of user-defined types more efficient with a custom
stream buffer ([#92](https://github.com/fmtlib/fmt/issues/92),
[#230 ](https://github.com/fmtlib/fmt/pull/230 )). Thanks to
[\@NotImplemented ](https://github.com/NotImplemented ).
- Further improved performance of `fmt::Writer` on integer formatting
and fixed a minor regression. Now it is \~7% faster than
`karma::generate` on Karma\'s benchmark
([#186](https://github.com/fmtlib/fmt/issues/186)).
- \[Breaking\] Reduced [compiled code
size](https://github.com/fmtlib/fmt#compile-time-and-code-bloat)
([#143](https://github.com/fmtlib/fmt/issues/143),
[#149 ](https://github.com/fmtlib/fmt/pull/149 )).
## Distribution
- \[Breaking\] Headers are now installed in
`${CMAKE_INSTALL_PREFIX}/include/cppformat`
([#178](https://github.com/fmtlib/fmt/issues/178)). Thanks to
[\@jackyf (Eugene V. Lyubimkin) ](https://github.com/jackyf ).
- \[Breaking\] Changed the library name from `format` to `cppformat`
for consistency with the project name and to avoid potential
conflicts ([#178](https://github.com/fmtlib/fmt/issues/178)). Thanks
to [\@jackyf (Eugene V. Lyubimkin) ](https://github.com/jackyf ).
- C++ Format is now available in [Debian ](https://www.debian.org/ )
GNU/Linux
([stretch](https://packages.debian.org/source/stretch/cppformat),
[sid ](https://packages.debian.org/source/sid/cppformat )) and derived
distributions such as
[Ubuntu ](https://launchpad.net/ubuntu/+source/cppformat ) 15.10 and
later ([#155](https://github.com/fmtlib/fmt/issues/155)):
$ sudo apt-get install libcppformat1-dev
Thanks to [\@jackyf (Eugene V.
Lyubimkin)](https://github.com/jackyf).
- [Packages for Fedora and
RHEL](https://admin.fedoraproject.org/pkgdb/package/cppformat/) are
now available. Thanks to Dave Johansen.
- C++ Format can now be installed via [Homebrew ](http://brew.sh/ ) on
OS X ([#157](https://github.com/fmtlib/fmt/issues/157)):
$ brew install cppformat
Thanks to [\@ortho ](https://github.com/ortho ), Anatoliy Bulukin.
## Documentation
- Migrated from ReadTheDocs to GitHub Pages for better responsiveness
and reliability ([#128](https://github.com/fmtlib/fmt/issues/128)).
New documentation address is < http: / / cppformat . github . io / > .
- Added [Building the
documentation](https://fmt.dev/2.0.0/usage.html#building-the-documentation)
section to the documentation.
- Documentation build script is now compatible with Python 3 and newer
pip versions. ([#189](https://github.com/fmtlib/fmt/pull/189),
[#209 ](https://github.com/fmtlib/fmt/issues/209 )). Thanks to
[\@JodiTheTigger ](https://github.com/JodiTheTigger ) and
[\@xentec ](https://github.com/xentec ).
- Documentation fixes and improvements
([#36](https://github.com/fmtlib/fmt/issues/36),
[#75 ](https://github.com/fmtlib/fmt/issues/75 ),
[#125 ](https://github.com/fmtlib/fmt/issues/125 ),
[#160 ](https://github.com/fmtlib/fmt/pull/160 ),
[#161 ](https://github.com/fmtlib/fmt/pull/161 ),
[#162 ](https://github.com/fmtlib/fmt/issues/162 ),
[#165 ](https://github.com/fmtlib/fmt/issues/165 ),
[#210 ](https://github.com/fmtlib/fmt/issues/210 )). Thanks to
[\@syohex (Syohei YOSHIDA) ](https://github.com/syohex ) and bug
reporters.
- Fixed out-of-tree documentation build
([#177](https://github.com/fmtlib/fmt/issues/177)). Thanks to
[\@jackyf (Eugene V. Lyubimkin) ](https://github.com/jackyf ).
## Fixes
- Fixed `initializer_list` detection
([#136](https://github.com/fmtlib/fmt/issues/136)). Thanks to
[\@Gachapen (Magnus Bjerke Vik) ](https://github.com/Gachapen ).
- \[Breaking\] Fixed formatting of enums with numeric format
specifiers in `fmt::(s)printf`
([#131](https://github.com/fmtlib/fmt/issues/131),
[#139 ](https://github.com/fmtlib/fmt/issues/139 )):
```c++
enum { ANSWER = 42 };
fmt::printf("%d", ANSWER);
```
Thanks to [\@Naios ](https://github.com/Naios ).
- Improved compatibility with old versions of MinGW
([#129](https://github.com/fmtlib/fmt/issues/129),
[#130 ](https://github.com/fmtlib/fmt/pull/130 ),
[#132 ](https://github.com/fmtlib/fmt/issues/132 )). Thanks to
[\@cstamford (Christopher Stamford) ](https://github.com/cstamford ).
- Fixed a compile error on MSVC with disabled exceptions
([#144](https://github.com/fmtlib/fmt/issues/144)).
- Added a workaround for broken implementation of variadic templates
in MSVC2012 ([#148](https://github.com/fmtlib/fmt/issues/148)).
- Placed the anonymous namespace within `fmt` namespace for the
header-only configuration
([#171](https://github.com/fmtlib/fmt/issues/171)). Thanks to
[\@alfps (Alf P. Steinbach) ](https://github.com/alfps ).
- Fixed issues reported by Coverity Scan
([#187](https://github.com/fmtlib/fmt/issues/187),
[#192 ](https://github.com/fmtlib/fmt/issues/192 )).
- Implemented a workaround for a name lookup bug in MSVC2010
([#188](https://github.com/fmtlib/fmt/issues/188)).
- Fixed compiler warnings
([#95](https://github.com/fmtlib/fmt/issues/95),
[#96 ](https://github.com/fmtlib/fmt/issues/96 ),
[#114 ](https://github.com/fmtlib/fmt/pull/114 ),
[#135 ](https://github.com/fmtlib/fmt/issues/135 ),
[#142 ](https://github.com/fmtlib/fmt/issues/142 ),
[#145 ](https://github.com/fmtlib/fmt/issues/145 ),
[#146 ](https://github.com/fmtlib/fmt/issues/146 ),
[#158 ](https://github.com/fmtlib/fmt/issues/158 ),
[#163 ](https://github.com/fmtlib/fmt/issues/163 ),
[#175 ](https://github.com/fmtlib/fmt/issues/175 ),
[#190 ](https://github.com/fmtlib/fmt/issues/190 ),
[#191 ](https://github.com/fmtlib/fmt/pull/191 ),
[#194 ](https://github.com/fmtlib/fmt/issues/194 ),
[#196 ](https://github.com/fmtlib/fmt/pull/196 ),
[#216 ](https://github.com/fmtlib/fmt/issues/216 ),
[#218 ](https://github.com/fmtlib/fmt/pull/218 ),
[#220 ](https://github.com/fmtlib/fmt/pull/220 ),
[#229 ](https://github.com/fmtlib/fmt/pull/229 ),
[#233 ](https://github.com/fmtlib/fmt/issues/233 ),
[#234 ](https://github.com/fmtlib/fmt/issues/234 ),
[#236 ](https://github.com/fmtlib/fmt/pull/236 ),
[#281 ](https://github.com/fmtlib/fmt/issues/281 ),
[#289 ](https://github.com/fmtlib/fmt/issues/289 )). Thanks to
[\@seanmiddleditch (Sean
Middleditch)](https://github.com/seanmiddleditch), [\@dixlorenz (Dix
Lorenz)](https://github.com/dixlorenz), [\@CarterLi
(李通洲)](https://github.com/CarterLi),
[\@Naios ](https://github.com/Naios ), [\@fmatthew5876 (Matthew
Fioravante)](https://github.com/fmatthew5876), [\@LevskiWeng (Levski
Weng)](https://github.com/LevskiWeng),
[\@rpopescu ](https://github.com/rpopescu ), [\@gabime (Gabi
Melman)](https://github.com/gabime), [\@cubicool (Jeremy
Moles)](https://github.com/cubicool), [\@jkflying (Julian
Kent)](https://github.com/jkflying), [\@LogicalKnight (Sean
L)](https://github.com/LogicalKnight), [\@inguin (Ingo van
Lil)](https://github.com/inguin) and [\@Jopie64
(Johan)](https://github.com/Jopie64).
- Fixed portability issues (mostly causing test failures) on ARM,
ppc64, ppc64le, s390x and SunOS 5.11 i386
([#138](https://github.com/fmtlib/fmt/issues/138),
[#179 ](https://github.com/fmtlib/fmt/issues/179 ),
[#180 ](https://github.com/fmtlib/fmt/issues/180 ),
[#202 ](https://github.com/fmtlib/fmt/issues/202 ),
[#225 ](https://github.com/fmtlib/fmt/issues/225 ), [Red Hat Bugzilla
Bug 1260297](https://bugzilla.redhat.com/show_bug.cgi?id=1260297)).
Thanks to [\@Naios ](https://github.com/Naios ), [\@jackyf (Eugene V.
Lyubimkin)](https://github.com/jackyf) and Dave Johansen.
- Fixed a name conflict with macro `free` defined in `crtdbg.h` when
`_CRTDBG_MAP_ALLOC` is set
([#211](https://github.com/fmtlib/fmt/issues/211)).
- Fixed shared library build on OS X
([#212](https://github.com/fmtlib/fmt/pull/212)). Thanks to
[\@dean0x7d (Dean Moldovan) ](https://github.com/dean0x7d ).
- Fixed an overload conflict on MSVC when `/Zc:wchar_t-` option is
specified ([#214](https://github.com/fmtlib/fmt/pull/214)). Thanks
to [\@slavanap (Vyacheslav
Napadovsky)](https://github.com/slavanap).
- Improved compatibility with MSVC 2008
([#236](https://github.com/fmtlib/fmt/pull/236)). Thanks to
[\@Jopie64 (Johan) ](https://github.com/Jopie64 ).
- Improved compatibility with bcc32
([#227](https://github.com/fmtlib/fmt/issues/227)).
- Fixed `static_assert` detection on Clang
([#228](https://github.com/fmtlib/fmt/pull/228)). Thanks to
[\@dean0x7d (Dean Moldovan) ](https://github.com/dean0x7d ).
# 1.1.0 - 2015-03-06
- Added `BasicArrayWriter` , a class template that provides operations
for formatting and writing data into a fixed-size array
([#105](https://github.com/fmtlib/fmt/issues/105) and
[#122 ](https://github.com/fmtlib/fmt/issues/122 )):
```c++
char buffer[100];
fmt::ArrayWriter w(buffer);
w.write("The answer is {}", 42);
```
- Added [0 A.D. ](http://play0ad.com/ ) and [PenUltima Online
(POL)](http://www.polserver.com/) to the list of notable projects
using C++ Format.
- C++ Format now uses MSVC intrinsics for better formatting
performance ([#115](https://github.com/fmtlib/fmt/pull/115),
[#116 ](https://github.com/fmtlib/fmt/pull/116 ),
[#118 ](https://github.com/fmtlib/fmt/pull/118 ) and
[#121 ](https://github.com/fmtlib/fmt/pull/121 )). Previously these
optimizations where only used on GCC and Clang. Thanks to
[\@CarterLi ](https://github.com/CarterLi ) and
[\@objectx ](https://github.com/objectx ).
- CMake install target
([#119](https://github.com/fmtlib/fmt/pull/119)). Thanks to
[\@TrentHouliston ](https://github.com/TrentHouliston ).
You can now install C++ Format with `make install` command.
- Improved [Biicode ](http://www.biicode.com/ ) support
([#98](https://github.com/fmtlib/fmt/pull/98) and
[#104 ](https://github.com/fmtlib/fmt/pull/104 )). Thanks to
[\@MariadeAnton ](https://github.com/MariadeAnton ) and
[\@franramirez688 ](https://github.com/franramirez688 ).
- Improved support for building with [Android
NDK](https://developer.android.com/tools/sdk/ndk/index.html)
([#107](https://github.com/fmtlib/fmt/pull/107)). Thanks to
[\@newnon ](https://github.com/newnon ).
The
[android-ndk-example ](https://github.com/fmtlib/android-ndk-example )
repository provides and example of using C++ Format with Android
NDK:
2023-09-04 14:59:30 +00:00
2023-09-04 14:07:24 +00:00
- Improved documentation of `SystemError` and `WindowsError`
([#54](https://github.com/fmtlib/fmt/issues/54)).
- Various code improvements
([#110](https://github.com/fmtlib/fmt/pull/110),
[#111 ](https://github.com/fmtlib/fmt/pull/111 )
[#112 ](https://github.com/fmtlib/fmt/pull/112 )). Thanks to
[\@CarterLi ](https://github.com/CarterLi ).
- Improved compile-time errors when formatting wide into narrow
strings ([#117](https://github.com/fmtlib/fmt/issues/117)).
- Fixed `BasicWriter::write` without formatting arguments when C++11
support is disabled
([#109](https://github.com/fmtlib/fmt/issues/109)).
- Fixed header-only build on OS X with GCC 4.9
([#124](https://github.com/fmtlib/fmt/issues/124)).
- Fixed packaging issues
([#94](https://github.com/fmtlib/fmt/issues/94)).
- Added
[changelog ](https://github.com/fmtlib/fmt/blob/master/ChangeLog.rst )
([#103](https://github.com/fmtlib/fmt/issues/103)).
# 1.0.0 - 2015-02-05
- Add support for a header-only configuration when `FMT_HEADER_ONLY`
is defined before including `format.h` :
```c++
#define FMT_HEADER_ONLY
#include "format.h"
```
- Compute string length in the constructor of `BasicStringRef` instead
of the `size` method
([#79](https://github.com/fmtlib/fmt/issues/79)). This eliminates
size computation for string literals on reasonable optimizing
compilers.
- Fix formatting of types with overloaded `operator <<` for
`std::wostream` ([#86](https://github.com/fmtlib/fmt/issues/86)):
```c++
fmt::format(L"The date is {0}", Date(2012, 12, 9));
```
- Fix linkage of tests on Arch Linux
([#89](https://github.com/fmtlib/fmt/issues/89)).
- Allow precision specifier for non-float arguments
([#90](https://github.com/fmtlib/fmt/issues/90)):
```c++
fmt::print("{:.3}\n", "Carpet"); // prints "Car"
```
- Fix build on Android NDK
([#93](https://github.com/fmtlib/fmt/issues/93))
- Improvements to documentation build procedure.
- Remove `FMT_SHARED` CMake variable in favor of standard
[BUILD_SHARED_LIBS ](http://www.cmake.org/cmake/help/v3.0/variable/BUILD_SHARED_LIBS.html ).
- Fix error handling in `fmt::fprintf` .
- Fix a number of warnings.
# 0.12.0 - 2014-10-25
- \[Breaking\] Improved separation between formatting and buffer
management. `Writer` is now a base class that cannot be instantiated
directly. The new `MemoryWriter` class implements the default buffer
management with small allocations done on stack. So `fmt::Writer`
should be replaced with `fmt::MemoryWriter` in variable
declarations.
Old code:
```c++
fmt::Writer w;
```
New code:
```c++
fmt::MemoryWriter w;
```
If you pass `fmt::Writer` by reference, you can continue to do so:
```c++
void f(fmt::Writer &w);
```
This doesn\'t affect the formatting API.
- Support for custom memory allocators
([#69](https://github.com/fmtlib/fmt/issues/69))
- Formatting functions now accept [signed char]{.title-ref} and
[unsigned char]{.title-ref} strings as arguments
([#73](https://github.com/fmtlib/fmt/issues/73)):
```c++
auto s = format("GLSL version: {}", glGetString(GL_VERSION));
```
- Reduced code bloat. According to the new [benchmark
results](https://github.com/fmtlib/fmt#compile-time-and-code-bloat),
cppformat is close to `printf` and by the order of magnitude better
than Boost Format in terms of compiled code size.
- Improved appearance of the documentation on mobile by using the
[Sphinx Bootstrap
theme](http://ryan-roemer.github.io/sphinx-bootstrap-theme/):
2023-09-04 14:59:30 +00:00
| Old | New |
| --- | --- |
|  |  |
2023-09-04 14:07:24 +00:00
# 0.11.0 - 2014-08-21
- Safe printf implementation with a POSIX extension for positional
arguments:
```c++
fmt::printf("Elapsed time: %.2f seconds", 1.23);
fmt::printf("%1$s, %3$d %2$s", weekday, month, day);
```
- Arguments of `char` type can now be formatted as integers (Issue
[#55 ](https://github.com/fmtlib/fmt/issues/55 )):
```c++
fmt::format("0x{0:02X}", 'a');
```
- Deprecated parts of the API removed.
- The library is now built and tested on MinGW with Appveyor in
addition to existing test platforms Linux/GCC, OS X/Clang,
Windows/MSVC.
# 0.10.0 - 2014-07-01
**Improved API**
- All formatting methods are now implemented as variadic functions
instead of using `operator<<` for feeding arbitrary arguments into a
temporary formatter object. This works both with C++11 where
variadic templates are used and with older standards where variadic
functions are emulated by providing lightweight wrapper functions
defined with the `FMT_VARIADIC` macro. You can use this macro for
defining your own portable variadic functions:
```c++
void report_error(const char *format, const fmt::ArgList & args) {
fmt::print("Error: {}");
fmt::print(format, args);
}
FMT_VARIADIC(void, report_error, const char *)
report_error("file not found: {}", path);
```
Apart from a more natural syntax, this also improves performance as
there is no need to construct temporary formatter objects and
control arguments\' lifetimes. Because the wrapper functions are
very lightweight, this doesn\'t cause code bloat even in pre-C++11
mode.
- Simplified common case of formatting an `std::string` . Now it
requires a single function call:
```c++
std::string s = format("The answer is {}.", 42);
```
Previously it required 2 function calls:
```c++
std::string s = str(Format("The answer is {}.") < < 42 ) ;
```
Instead of unsafe `c_str` function, `fmt::Writer` should be used
directly to bypass creation of `std::string` :
```c++
fmt::Writer w;
w.write("The answer is {}.", 42);
w.c_str(); // returns a C string
```
This doesn\'t do dynamic memory allocation for small strings and is
less error prone as the lifetime of the string is the same as for
`std::string::c_str` which is well understood (hopefully).
- Improved consistency in naming functions that are a part of the
public API. Now all public functions are lowercase following the
standard library conventions. Previously it was a combination of
lowercase and CapitalizedWords. Issue
[#50 ](https://github.com/fmtlib/fmt/issues/50 ).
- Old functions are marked as deprecated and will be removed in the
next release.
**Other Changes**
- Experimental support for printf format specifications (work in
progress):
```c++
fmt::printf("The answer is %d.", 42);
std::string s = fmt::sprintf("Look, a %s!", "string");
```
- Support for hexadecimal floating point format specifiers `a` and
`A` :
```c++
print("{:a}", -42.0); // Prints -0x1.5p+5
print("{:A}", -42.0); // Prints -0X1.5P+5
```
- CMake option `FMT_SHARED` that specifies whether to build format as
a shared library (off by default).
# 0.9.0 - 2014-05-13
- More efficient implementation of variadic formatting functions.
- `Writer::Format` now has a variadic overload:
```c++
Writer out;
out.Format("Look, I'm {}!", "variadic");
```
- For efficiency and consistency with other overloads, variadic
overload of the `Format` function now returns `Writer` instead of
`std::string` . Use the `str` function to convert it to
`std::string` :
```c++
std::string s = str(Format("Look, I'm {}!", "variadic"));
```
- Replaced formatter actions with output sinks: `NoAction` -\>
`NullSink` , `Write` -\> `FileSink` , `ColorWriter` -\>
`ANSITerminalSink` . This improves naming consistency and shouldn\'t
affect client code unless these classes are used directly which
should be rarely needed.
- Added `ThrowSystemError` function that formats a message and throws
`SystemError` containing the formatted message and system-specific
error description. For example, the following code
```c++
FILE *f = fopen(filename, "r");
if (!f)
ThrowSystemError(errno, "Failed to open file '{}'") < < filename ;
```
will throw `SystemError` exception with description \"Failed to open
file \'\<filename\>\': No such file or directory\" if file doesn\'t
exist.
- Support for AppVeyor continuous integration platform.
- `Format` now throws `SystemError` in case of I/O errors.
- Improve test infrastructure. Print functions are now tested by
redirecting the output to a pipe.
# 0.8.0 - 2014-04-14
- Initial release
