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Cleanup chrono formatting

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This commit is contained in:
Victor Zverovich 2024-08-18 12:16:36 -07:00
parent 89af1ad77d
commit 1a79bbfa83
1 changed files with 39 additions and 36 deletions
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75
include/fmt/chrono.h
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@ -28,15 +28,6 @@ template <typename... T> inline void _tzset(T...) {}
FMT_BEGIN_NAMESPACE
// Check if std::chrono::local_t is available.
#ifndef FMT_USE_LOCAL_TIME
# ifdef __cpp_lib_chrono
# define FMT_USE_LOCAL_TIME (__cpp_lib_chrono >= 201907L)
# else
# define FMT_USE_LOCAL_TIME 0
# endif
#endif
// Enable safe chrono durations, unless explicitly disabled.
#ifndef FMT_SAFE_DURATION_CAST
# define FMT_SAFE_DURATION_CAST 1
@ -263,6 +254,20 @@ struct utc_clock {
};
#endif
// Check if std::chrono::local_time is available.
#ifdef FMT_USE_LOCAL_TIME
// Use the provided definition.
#elif defined(__cpp_lib_chrono)
# define FMT_USE_LOCAL_TIME (__cpp_lib_chrono >= 201907L)
#else
# define FMT_USE_LOCAL_TIME 0
#endif
#if FMT_USE_LOCAL_TIME
using local_t = std::chrono::local_t;
#else
struct local_t {};
#endif
} // namespace detail
template <typename Duration>
@ -271,6 +276,9 @@ using sys_time = std::chrono::time_point<std::chrono::system_clock, Duration>;
template <typename Duration>
using utc_time = std::chrono::time_point<detail::utc_clock, Duration>;
template <class Duration>
using local_time = std::chrono::time_point<detail::local_t, Duration>;
namespace detail {
// Prevents expansion of a preceding token as a function-style macro.
@ -2377,33 +2385,7 @@ struct formatter<sys_time<Duration>, Char> : formatter<std::tm, Char> {
}
};
#if FMT_USE_LOCAL_TIME
template <typename Char, typename Duration>
struct formatter<std::chrono::local_time<Duration>, Char>
: formatter<std::tm, Char> {
FMT_CONSTEXPR formatter() {
this->format_str_ = detail::string_literal<Char, '%', 'F', ' ', '%', 'T'>();
}
template <typename FormatContext>
auto format(std::chrono::local_time<Duration> val, FormatContext& ctx) const
-> decltype(ctx.out()) {
using period = typename Duration::period;
if (period::num != 1 || period::den != 1 ||
std::is_floating_point<typename Duration::rep>::value) {
const auto epoch = val.time_since_epoch();
const auto subsecs = detail::duration_cast<Duration>(
epoch - detail::duration_cast<std::chrono::seconds>(epoch));
return formatter<std::tm, Char>::do_format(localtime(val), ctx, &subsecs);
}
return formatter<std::tm, Char>::format(localtime(val), ctx);
}
};
#endif
template <typename Char, typename Duration>
template <typename Duration, typename Char>
struct formatter<utc_time<Duration>, Char>
: formatter<sys_time<Duration>, Char> {
template <typename FormatContext>
@ -2414,6 +2396,27 @@ struct formatter<utc_time<Duration>, Char>
}
};
template <typename Duration, typename Char>
struct formatter<local_time<Duration>, Char> : formatter<std::tm, Char> {
FMT_CONSTEXPR formatter() {
this->format_str_ = detail::string_literal<Char, '%', 'F', ' ', '%', 'T'>();
}
template <typename FormatContext>
auto format(local_time<Duration> val, FormatContext& ctx) const
-> decltype(ctx.out()) {
using period = typename Duration::period;
if (period::num == 1 && period::den == 1 &&
!std::is_floating_point<typename Duration::rep>::value) {
return formatter<std::tm, Char>::format(localtime(val), ctx);
}
auto epoch = val.time_since_epoch();
auto subsecs = detail::duration_cast<Duration>(
epoch - detail::duration_cast<std::chrono::seconds>(epoch));
return formatter<std::tm, Char>::do_format(localtime(val), ctx, &subsecs);
}
};
FMT_END_EXPORT
FMT_END_NAMESPACE