mirror of
https://github.com/jart/cosmopolitan.git
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112 lines
3.8 KiB
C++
112 lines
3.8 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___CHRONO_HH_MM_SS_H
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#define _LIBCPP___CHRONO_HH_MM_SS_H
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#include <__chrono/duration.h>
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#include <__chrono/time_point.h>
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#include <__config>
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#include <__type_traits/common_type.h>
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#include <ratio>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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#if _LIBCPP_STD_VER >= 20
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace chrono {
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template <class _Duration>
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class hh_mm_ss {
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private:
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static_assert(__is_duration<_Duration>::value, "template parameter of hh_mm_ss must be a std::chrono::duration");
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using __CommonType = common_type_t<_Duration, chrono::seconds>;
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_LIBCPP_HIDE_FROM_ABI static constexpr uint64_t __pow10(unsigned __exp) {
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uint64_t __ret = 1;
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for (unsigned __i = 0; __i < __exp; ++__i)
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__ret *= 10U;
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return __ret;
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}
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_LIBCPP_HIDE_FROM_ABI static constexpr unsigned __width(uint64_t __n, uint64_t __d = 10, unsigned __w = 0) {
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if (__n >= 2 && __d != 0 && __w < 19)
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return 1 + __width(__n, __d % __n * 10, __w + 1);
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return 0;
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}
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public:
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_LIBCPP_HIDE_FROM_ABI static unsigned constexpr fractional_width =
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__width(__CommonType::period::den) < 19 ? __width(__CommonType::period::den) : 6u;
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using precision = duration<typename __CommonType::rep, ratio<1, __pow10(fractional_width)>>;
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_LIBCPP_HIDE_FROM_ABI constexpr hh_mm_ss() noexcept : hh_mm_ss{_Duration::zero()} {}
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_LIBCPP_HIDE_FROM_ABI constexpr explicit hh_mm_ss(_Duration __d) noexcept
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: __is_neg_(__d < _Duration(0)),
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__h_(chrono::duration_cast<chrono::hours>(chrono::abs(__d))),
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__m_(chrono::duration_cast<chrono::minutes>(chrono::abs(__d) - hours())),
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__s_(chrono::duration_cast<chrono::seconds>(chrono::abs(__d) - hours() - minutes())),
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__f_(chrono::duration_cast<precision>(chrono::abs(__d) - hours() - minutes() - seconds())) {}
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_LIBCPP_HIDE_FROM_ABI constexpr bool is_negative() const noexcept { return __is_neg_; }
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_LIBCPP_HIDE_FROM_ABI constexpr chrono::hours hours() const noexcept { return __h_; }
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_LIBCPP_HIDE_FROM_ABI constexpr chrono::minutes minutes() const noexcept { return __m_; }
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_LIBCPP_HIDE_FROM_ABI constexpr chrono::seconds seconds() const noexcept { return __s_; }
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_LIBCPP_HIDE_FROM_ABI constexpr precision subseconds() const noexcept { return __f_; }
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_LIBCPP_HIDE_FROM_ABI constexpr precision to_duration() const noexcept {
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auto __dur = __h_ + __m_ + __s_ + __f_;
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return __is_neg_ ? -__dur : __dur;
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}
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_LIBCPP_HIDE_FROM_ABI constexpr explicit operator precision() const noexcept { return to_duration(); }
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private:
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bool __is_neg_;
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chrono::hours __h_;
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chrono::minutes __m_;
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chrono::seconds __s_;
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precision __f_;
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};
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_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(hh_mm_ss);
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_LIBCPP_HIDE_FROM_ABI inline constexpr bool is_am(const hours& __h) noexcept {
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return __h >= hours(0) && __h < hours(12);
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}
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_LIBCPP_HIDE_FROM_ABI inline constexpr bool is_pm(const hours& __h) noexcept {
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return __h >= hours(12) && __h < hours(24);
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}
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_LIBCPP_HIDE_FROM_ABI inline constexpr hours make12(const hours& __h) noexcept {
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if (__h == hours(0))
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return hours(12);
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else if (__h <= hours(12))
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return __h;
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else
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return __h - hours(12);
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}
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_LIBCPP_HIDE_FROM_ABI inline constexpr hours make24(const hours& __h, bool __is_pm) noexcept {
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if (__is_pm)
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return __h == hours(12) ? __h : __h + hours(12);
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else
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return __h == hours(12) ? hours(0) : __h;
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}
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} // namespace chrono
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_STD_VER >= 20
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#endif // _LIBCPP___CHRONO_HH_MM_SS_H
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