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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// For information see https://libcxx.llvm.org/DesignDocs/TimeZone.html
#ifndef _LIBCPP___CHRONO_LEAP_SECOND_H
#define _LIBCPP___CHRONO_LEAP_SECOND_H
#include <version>
// Enable the contents of the header only when libc++ was built with experimental features enabled.
#if _LIBCPP_HAS_EXPERIMENTAL_TZDB
# include <__chrono/duration.h>
# include <__chrono/system_clock.h>
# include <__chrono/time_point.h>
# include <__compare/ordering.h>
# include <__compare/three_way_comparable.h>
# include <__config>
# include <__utility/private_constructor_tag.h>
# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
# endif
_LIBCPP_BEGIN_NAMESPACE_STD
# if _LIBCPP_STD_VER >= 20
namespace chrono {
class leap_second {
public:
[[nodiscard]]
_LIBCPP_HIDE_FROM_ABI explicit constexpr leap_second(__private_constructor_tag, sys_seconds __date, seconds __value)
: __date_(__date), __value_(__value) {}
_LIBCPP_HIDE_FROM_ABI leap_second(const leap_second&) = default;
_LIBCPP_HIDE_FROM_ABI leap_second& operator=(const leap_second&) = default;
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr sys_seconds date() const noexcept { return __date_; }
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr seconds value() const noexcept { return __value_; }
private:
sys_seconds __date_;
seconds __value_;
// The function
// template<class Duration>
// requires three_way_comparable_with<sys_seconds, sys_time<Duration>>
// constexpr auto operator<=>(const leap_second& x, const sys_time<Duration>& y) noexcept;
//
// Has constraints that are recursive (LWG4139). The proposed resolution is
// to make the funcion a hidden friend. For consistency make this change for
// all comparison functions.
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const leap_second& __x, const leap_second& __y) {
return __x.date() == __y.date();
}
_LIBCPP_HIDE_FROM_ABI friend constexpr strong_ordering operator<=>(const leap_second& __x, const leap_second& __y) {
return __x.date() <=> __y.date();
}
template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const leap_second& __x, const sys_time<_Duration>& __y) {
return __x.date() == __y;
}
template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator<(const leap_second& __x, const sys_time<_Duration>& __y) {
return __x.date() < __y;
}
template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator<(const sys_time<_Duration>& __x, const leap_second& __y) {
return __x < __y.date();
}
template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator>(const leap_second& __x, const sys_time<_Duration>& __y) {
return __y < __x;
}
template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator>(const sys_time<_Duration>& __x, const leap_second& __y) {
return __y < __x;
}
template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator<=(const leap_second& __x, const sys_time<_Duration>& __y) {
return !(__y < __x);
}
template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator<=(const sys_time<_Duration>& __x, const leap_second& __y) {
return !(__y < __x);
}
template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator>=(const leap_second& __x, const sys_time<_Duration>& __y) {
return !(__x < __y);
}
template <class _Duration>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator>=(const sys_time<_Duration>& __x, const leap_second& __y) {
return !(__x < __y);
}
template <class _Duration>
requires three_way_comparable_with<sys_seconds, sys_time<_Duration>>
_LIBCPP_HIDE_FROM_ABI friend constexpr auto operator<=>(const leap_second& __x, const sys_time<_Duration>& __y) {
return __x.date() <=> __y;
}
};
} // namespace chrono
# endif // _LIBCPP_STD_VER >= 20
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_HAS_EXPERIMENTAL_TZDB
#endif // _LIBCPP___CHRONO_LEAP_SECOND_H
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