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Refactor fmt_duration_cast to put #ifdef inside the function

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This commit is contained in:
Corentin Schreiber 2023-11-25 15:57:06 +00:00
parent bbfeea882f
commit 0b52401b2b
1 changed files with 28 additions and 22 deletions
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50
include/fmt/chrono.h
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@ -430,41 +430,47 @@ auto write(OutputIt out, const std::tm& time, const std::locale& loc,
return write_encoded_tm_str(out, string_view(buf.data(), buf.size()), loc);
}
#if FMT_SAFE_DURATION_CAST
// throwing version of safe_duration_cast
// only available for integer<->integer or float<->float casts
template <typename To, typename FromRep, typename FromPeriod,
FMT_ENABLE_IF((std::is_integral<FromRep>::value &&
std::is_integral<typename To::rep>::value) ||
(std::is_floating_point<FromRep>::value &&
std::is_floating_point<typename To::rep>::value))>
template <typename Rep1, typename Rep2>
struct is_same_arithmetic_type
: public std::integral_constant<bool,
(std::is_integral<Rep1>::value &&
std::is_integral<Rep2>::value) ||
(std::is_floating_point<Rep1>::value &&
std::is_floating_point<Rep2>::value)> {
};
template <
typename To, typename FromRep, typename FromPeriod,
FMT_ENABLE_IF(is_same_arithmetic_type<FromRep, typename To::rep>::value)>
To fmt_duration_cast(std::chrono::duration<FromRep, FromPeriod> from) {
#if FMT_SAFE_DURATION_CAST
// throwing version of safe_duration_cast
// only available for integer<->integer or float<->float casts
int ec;
To to = safe_duration_cast::safe_duration_cast<To>(from, ec);
if (ec) FMT_THROW(format_error("cannot format duration"));
return to;
}
// mixed integer<->float cast is not supported with safe_duration_cast
// fallback to standard duration cast in this case
template <typename To, typename FromRep, typename FromPeriod,
FMT_ENABLE_IF((std::is_integral<FromRep>::value !=
std::is_integral<typename To::rep>::value) &&
(std::is_floating_point<FromRep>::value !=
std::is_floating_point<typename To::rep>::value))>
To fmt_duration_cast(std::chrono::duration<FromRep, FromPeriod> from) {
return std::chrono::duration_cast<To>(from);
}
#else
// standard duration cast, may overflow and invoke undefined behavior
template <typename To, typename FromRep, typename FromPeriod>
// standard duration cast, may overflow and invoke undefined behavior
return std::chrono::duration_cast<To>(from);
#endif
}
template <
typename To, typename FromRep, typename FromPeriod,
FMT_ENABLE_IF(!is_same_arithmetic_type<FromRep, typename To::rep>::value)>
To fmt_duration_cast(std::chrono::duration<FromRep, FromPeriod> from) {
// mixed integer<->float cast is not supported with safe_duration_cast
// fallback to standard duration cast in this case
return std::chrono::duration_cast<To>(from);
}
#endif
template <typename Duration>
std::time_t to_time_t(
std::chrono::time_point<std::chrono::system_clock, Duration> time_point) {
// cannot use std::chrono::system_clock::to_time_t() since this would first
// require a cast to std::chrono::system_clock::time_point, which could
// overflow.
return fmt_duration_cast<std::chrono::duration<std::time_t>>(
time_point.time_since_epoch())
.count();