1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___CHRONO_HH_MM_SS_H 11 #define _LIBCPP___CHRONO_HH_MM_SS_H 12 13 #include <__chrono/duration.h> 14 #include <__chrono/time_point.h> 15 #include <__config> 16 #include <__type_traits/common_type.h> 17 #include <ratio> 18 19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 20 # pragma GCC system_header 21 #endif 22 23 #if _LIBCPP_STD_VER >= 20 24 25 _LIBCPP_BEGIN_NAMESPACE_STD 26 27 namespace chrono 28 { 29 30 template <class _Duration> 31 class hh_mm_ss 32 { 33 private: 34 static_assert(__is_duration<_Duration>::value, "template parameter of hh_mm_ss must be a std::chrono::duration"); 35 using __CommonType = common_type_t<_Duration, chrono::seconds>; 36 37 _LIBCPP_HIDE_FROM_ABI static constexpr uint64_t __pow10(unsigned __exp) 38 { 39 uint64_t __ret = 1; 40 for (unsigned __i = 0; __i < __exp; ++__i) 41 __ret *= 10U; 42 return __ret; 43 } 44 45 _LIBCPP_HIDE_FROM_ABI static constexpr unsigned __width(uint64_t __n, uint64_t __d = 10, unsigned __w = 0) 46 { 47 if (__n >= 2 && __d != 0 && __w < 19) 48 return 1 + __width(__n, __d % __n * 10, __w+1); 49 return 0; 50 } 51 52 public: 53 _LIBCPP_HIDE_FROM_ABI static unsigned constexpr fractional_width = __width(__CommonType::period::den) < 19 ? 54 __width(__CommonType::period::den) : 6u; 55 using precision = duration<typename __CommonType::rep, ratio<1, __pow10(fractional_width)>>; 56 57 _LIBCPP_HIDE_FROM_ABI constexpr hh_mm_ss() noexcept : hh_mm_ss{_Duration::zero()} {} 58 59 _LIBCPP_HIDE_FROM_ABI constexpr explicit hh_mm_ss(_Duration __d) noexcept : 60 __is_neg_(__d < _Duration(0)), 61 __h_(chrono::duration_cast<chrono::hours> (chrono::abs(__d))), 62 __m_(chrono::duration_cast<chrono::minutes>(chrono::abs(__d) - hours())), 63 __s_(chrono::duration_cast<chrono::seconds>(chrono::abs(__d) - hours() - minutes())), 64 __f_(chrono::duration_cast<precision> (chrono::abs(__d) - hours() - minutes() - seconds())) 65 {} 66 67 _LIBCPP_HIDE_FROM_ABI constexpr bool is_negative() const noexcept { return __is_neg_; } 68 _LIBCPP_HIDE_FROM_ABI constexpr chrono::hours hours() const noexcept { return __h_; } 69 _LIBCPP_HIDE_FROM_ABI constexpr chrono::minutes minutes() const noexcept { return __m_; } 70 _LIBCPP_HIDE_FROM_ABI constexpr chrono::seconds seconds() const noexcept { return __s_; } 71 _LIBCPP_HIDE_FROM_ABI constexpr precision subseconds() const noexcept { return __f_; } 72 73 _LIBCPP_HIDE_FROM_ABI constexpr precision to_duration() const noexcept 74 { 75 auto __dur = __h_ + __m_ + __s_ + __f_; 76 return __is_neg_ ? -__dur : __dur; 77 } 78 79 _LIBCPP_HIDE_FROM_ABI constexpr explicit operator precision() const noexcept { return to_duration(); } 80 81 private: 82 bool __is_neg_; 83 chrono::hours __h_; 84 chrono::minutes __m_; 85 chrono::seconds __s_; 86 precision __f_; 87 }; 88 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(hh_mm_ss); 89 90 _LIBCPP_HIDE_FROM_ABI constexpr bool is_am(const hours& __h) noexcept { return __h >= hours( 0) && __h < hours(12); } 91 _LIBCPP_HIDE_FROM_ABI constexpr bool is_pm(const hours& __h) noexcept { return __h >= hours(12) && __h < hours(24); } 92 93 _LIBCPP_HIDE_FROM_ABI constexpr hours make12(const hours& __h) noexcept 94 { 95 if (__h == hours( 0)) return hours(12); 96 else if (__h <= hours(12)) return __h; 97 else return __h - hours(12); 98 } 99 100 _LIBCPP_HIDE_FROM_ABI constexpr hours make24(const hours& __h, bool __is_pm) noexcept 101 { 102 if (__is_pm) 103 return __h == hours(12) ? __h : __h + hours(12); 104 else 105 return __h == hours(12) ? hours(0) : __h; 106 } 107 } // namespace chrono 108 109 _LIBCPP_END_NAMESPACE_STD 110 111 #endif // _LIBCPP_STD_VER >= 20 112 113 #endif // _LIBCPP___CHRONO_HH_MM_SS_H 114