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Workaround a bug in libstdc++

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This commit is contained in:
Victor Zverovich 2024-09-14 07:15:39 -07:00
parent 0335312320
commit 538d8777e5
2 changed files with 26 additions and 7 deletions
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30
include/fmt/chrono.h
View File

@ -23,6 +23,17 @@
#include "format.h"
namespace fmt_detail {
struct time_zone {
template <typename Duration, typename T>
auto to_sys(T)
-> std::chrono::time_point<std::chrono::system_clock, Duration> {
return {};
}
};
template <typename... T> inline auto current_zone(T...) -> time_zone* {
return nullptr;
}
template <typename... T> inline void _tzset(T...) {}
} // namespace fmt_detail
@ -507,6 +518,14 @@ auto to_time_t(sys_time<Duration> time_point) -> std::time_t {
time_point.time_since_epoch())
.count();
}
// Workaround a bug in libstc++ which sets __cpp_lib_chrono to 201907 without
// providing current_zone(): https://github.com/fmtlib/fmt/issues/4160.
template <typename T> FMT_CONSTEXPR auto has_current_zone() -> bool {
using namespace std::chrono;
using namespace fmt_detail;
return !std::is_same<decltype(current_zone()), fmt_detail::time_zone*>::value;
}
} // namespace detail
FMT_BEGIN_EXPORT
@ -553,10 +572,12 @@ inline auto localtime(std::time_t time) -> std::tm {
}
#if FMT_USE_LOCAL_TIME
template <typename Duration>
template <typename Duration,
FMT_ENABLE_IF(detail::has_current_zone<Duration>())>
inline auto localtime(std::chrono::local_time<Duration> time) -> std::tm {
return localtime(
detail::to_time_t(std::chrono::current_zone()->to_sys(time)));
using namespace std::chrono;
using namespace fmt_detail;
return localtime(detail::to_time_t(current_zone()->to_sys<Duration>(time)));
}
#endif
@ -1559,9 +1580,8 @@ struct chrono_format_checker : null_chrono_spec_handler<chrono_format_checker> {
FMT_CONSTEXPR void on_iso_time() {}
FMT_CONSTEXPR void on_am_pm() {}
FMT_CONSTEXPR void on_duration_value() const {
if (has_precision_integral) {
if (has_precision_integral)
FMT_THROW(format_error("precision not allowed for this argument type"));
}
}
FMT_CONSTEXPR void on_duration_unit() {}
};

3
include/fmt/xchar.h
View File

@ -117,8 +117,7 @@ template <> struct is_char<char16_t> : std::true_type {};
template <> struct is_char<char32_t> : std::true_type {};
#ifdef __cpp_char8_t
template <>
struct is_char<char8_t> : bool_constant<detail::is_utf8_enabled> {};
template <> struct is_char<char8_t> : bool_constant<detail::is_utf8_enabled> {};
#endif
template <typename... T>