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 template <class _Duration> 30 class hh_mm_ss { 31 private: 32 static_assert(__is_duration<_Duration>::value, "template parameter of hh_mm_ss must be a std::chrono::duration"); 33 using __CommonType = common_type_t<_Duration, chrono::seconds>; 34 35 _LIBCPP_HIDE_FROM_ABI static constexpr uint64_t __pow10(unsigned __exp) { 36 uint64_t __ret = 1; 37 for (unsigned __i = 0; __i < __exp; ++__i) 38 __ret *= 10U; 39 return __ret; 40 } 41 42 _LIBCPP_HIDE_FROM_ABI static constexpr unsigned __width(uint64_t __n, uint64_t __d = 10, unsigned __w = 0) { 43 if (__n >= 2 && __d != 0 && __w < 19) 44 return 1 + __width(__n, __d % __n * 10, __w + 1); 45 return 0; 46 } 47 48 public: 49 _LIBCPP_HIDE_FROM_ABI static unsigned constexpr fractional_width = 50 __width(__CommonType::period::den) < 19 ? __width(__CommonType::period::den) : 6u; 51 using precision = duration<typename __CommonType::rep, ratio<1, __pow10(fractional_width)>>; 52 53 _LIBCPP_HIDE_FROM_ABI constexpr hh_mm_ss() noexcept : hh_mm_ss{_Duration::zero()} {} 54 55 _LIBCPP_HIDE_FROM_ABI constexpr explicit hh_mm_ss(_Duration __d) noexcept 56 : __is_neg_(__d < _Duration(0)), 57 __h_(chrono::duration_cast<chrono::hours>(chrono::abs(__d))), 58 __m_(chrono::duration_cast<chrono::minutes>(chrono::abs(__d) - hours())), 59 __s_(chrono::duration_cast<chrono::seconds>(chrono::abs(__d) - hours() - minutes())), 60 __f_(chrono::duration_cast<precision>(chrono::abs(__d) - hours() - minutes() - seconds())) {} 61 62 _LIBCPP_HIDE_FROM_ABI constexpr bool is_negative() const noexcept { return __is_neg_; } 63 _LIBCPP_HIDE_FROM_ABI constexpr chrono::hours hours() const noexcept { return __h_; } 64 _LIBCPP_HIDE_FROM_ABI constexpr chrono::minutes minutes() const noexcept { return __m_; } 65 _LIBCPP_HIDE_FROM_ABI constexpr chrono::seconds seconds() const noexcept { return __s_; } 66 _LIBCPP_HIDE_FROM_ABI constexpr precision subseconds() const noexcept { return __f_; } 67 68 _LIBCPP_HIDE_FROM_ABI constexpr precision to_duration() const noexcept { 69 auto __dur = __h_ + __m_ + __s_ + __f_; 70 return __is_neg_ ? -__dur : __dur; 71 } 72 73 _LIBCPP_HIDE_FROM_ABI constexpr explicit operator precision() const noexcept { return to_duration(); } 74 75 private: 76 bool __is_neg_; 77 chrono::hours __h_; 78 chrono::minutes __m_; 79 chrono::seconds __s_; 80 precision __f_; 81 }; 82 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(hh_mm_ss); 83 84 _LIBCPP_HIDE_FROM_ABI inline constexpr bool is_am(const hours& __h) noexcept { 85 return __h >= hours(0) && __h < hours(12); 86 } 87 _LIBCPP_HIDE_FROM_ABI inline constexpr bool is_pm(const hours& __h) noexcept { 88 return __h >= hours(12) && __h < hours(24); 89 } 90 91 _LIBCPP_HIDE_FROM_ABI inline constexpr hours make12(const hours& __h) noexcept { 92 if (__h == hours(0)) 93 return hours(12); 94 else if (__h <= hours(12)) 95 return __h; 96 else 97 return __h - hours(12); 98 } 99 100 _LIBCPP_HIDE_FROM_ABI inline constexpr hours make24(const hours& __h, bool __is_pm) noexcept { 101 if (__is_pm) 102 return __h == hours(12) ? __h : __h + hours(12); 103 else 104 return __h == hours(12) ? hours(0) : __h; 105 } 106 } // namespace chrono 107 108 _LIBCPP_END_NAMESPACE_STD 109 110 #endif // _LIBCPP_STD_VER >= 20 111 112 #endif // _LIBCPP___CHRONO_HH_MM_SS_H 113