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153 lines
4.6 KiB
ReStructuredText
153 lines
4.6 KiB
ReStructuredText
0.11.0 - 2014-08-21
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-------------------
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* Safe printf implementation with a POSIX extension for positional arguments:
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.. code:: c++
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fmt::printf("Elapsed time: %.2f seconds", 1.23);
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fmt::printf("%1$s, %3$d %2$s", weekday, month, day);
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* Arguments of ``char`` type can now be formatted as integers (#55):
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.. code:: c++
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fmt::format("0x{0:02X}", 'a');
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* Deprecated parts of the API removed.
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* The library is now built and tested on MinGW with Appveyor in addition to
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existing test platforms Linux/GCC, OS X/Clang, Windows/MSVC.
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0.10.0 - 2014-07-01
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-------------------
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**Improved API**
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* All formatting methods are now implemented as variadic functions instead
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of using ``operator<<`` for feeding arbitrary arguments into a temporary
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formatter object. This works both with C++11 where variadic templates are
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used and with older standards where variadic functions are emulated by
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providing lightweight wrapper functions defined with the ``FMT_VARIADIC``
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macro. You can use this macro for defining your own portable variadic
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functions:
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.. code:: c++
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void report_error(const char *format, const fmt::ArgList &args) {
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fmt::print("Error: {}");
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fmt::print(format, args);
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}
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FMT_VARIADIC(void, report_error, const char *)
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report_error("file not found: {}", path);
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Apart from a more natural syntax, this also improves performance as there
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is no need to construct temporary formatter objects and control arguments'
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lifetimes. Because the wrapper functions are very ligthweight, this doesn't
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cause code bloat even in pre-C++11 mode.
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* Simplified common case of formatting an ``std::string``. Now it requires a
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single function call:
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.. code:: c++
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std::string s = format("The answer is {}.", 42);
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Previously it required 2 function calls:
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.. code:: c++
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std::string s = str(Format("The answer is {}.") << 42);
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Instead of unsafe ``c_str`` function, ``fmt::Writer`` should be used directly
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to bypass creation of ``std::string``:
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.. code:: c++
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fmt::Writer w;
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w.write("The answer is {}.", 42);
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w.c_str(); // returns a C string
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This doesn't do dynamic memory allocation for small strings and is less error
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prone as the lifetime of the string is the same as for ``std::string::c_str``
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which is well understood (hopefully).
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* Improved consistency in naming functions that are a part of the public API.
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Now all public functions are lowercase following the standard library
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conventions. Previously it was a combination of lowercase and
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CapitalizedWords. Issue #50.
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* Old functions are marked as deprecated and will be removed in the next
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release.
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**Other Changes**
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* Experimental support for printf format specifications (work in progress):
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.. code:: c++
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fmt::printf("The answer is %d.", 42);
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std::string s = fmt::sprintf("Look, a %s!", "string");
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* Support for hexadecimal floating point format specifiers ``a`` and ``A``:
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.. code:: c++
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print("{:a}", -42.0); // Prints -0x1.5p+5
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print("{:A}", -42.0); // Prints -0X1.5P+5
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* CMake option ``FMT_SHARED`` that specifies whether to build format as a
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shared library (off by default).
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0.9.0 - 2014-05-13
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------------------
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* More efficient implementation of variadic formatting functions.
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* ``Writer::Format`` now has a variadic overload:
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.. code:: c++
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Writer out;
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out.Format("Look, I'm {}!", "variadic");
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* For efficiency and consistency with other overloads, variadic overload of
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the ``Format`` function now returns ``Writer`` instead of ``std::string``.
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Use the ``str`` function to convert it to ``std::string``:
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.. code:: c++
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std::string s = str(Format("Look, I'm {}!", "variadic"));
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* Replaced formatter actions with output sinks: ``NoAction`` -> ``NullSink``,
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``Write`` -> ``FileSink``, ``ColorWriter`` -> ``ANSITerminalSink``.
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This improves naming consistency and shouldn't affect client code unless
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these classes are used directly which should be rarely needed.
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* Added ``ThrowSystemError`` function that formats a message and throws
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``SystemError`` containing the formatted message and system-specific error
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description. For example, the following code
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.. code:: c++
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FILE *f = fopen(filename, "r");
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if (!f)
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ThrowSystemError(errno, "Failed to open file '{}'") << filename;
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will throw ``SystemError`` exception with description
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"Failed to open file '<filename>': No such file or directory" if file
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doesn't exist.
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* Support for AppVeyor continuous integration platform.
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* ``Format`` now throws ``SystemError`` in case of I/O errors.
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* Improve test infrastructure. Print functions are now tested by redirecting
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the output to a pipe.
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0.8.0 - 2014-04-14
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------------------
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* Initial release
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