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
__pow10(unsigned __exp)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
hh_mm_ss()53 _LIBCPP_HIDE_FROM_ABI constexpr hh_mm_ss() noexcept : hh_mm_ss{_Duration::zero()} {}
54
hh_mm_ss(_Duration __d)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
is_negative()62 _LIBCPP_HIDE_FROM_ABI constexpr bool is_negative() const noexcept { return __is_neg_; }
hours()63 _LIBCPP_HIDE_FROM_ABI constexpr chrono::hours hours() const noexcept { return __h_; }
minutes()64 _LIBCPP_HIDE_FROM_ABI constexpr chrono::minutes minutes() const noexcept { return __m_; }
seconds()65 _LIBCPP_HIDE_FROM_ABI constexpr chrono::seconds seconds() const noexcept { return __s_; }
subseconds()66 _LIBCPP_HIDE_FROM_ABI constexpr precision subseconds() const noexcept { return __f_; }
67
to_duration()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
precision()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
is_am(const hours & __h)84 _LIBCPP_HIDE_FROM_ABI inline constexpr bool is_am(const hours& __h) noexcept {
85 return __h >= hours(0) && __h < hours(12);
86 }
is_pm(const hours & __h)87 _LIBCPP_HIDE_FROM_ABI inline constexpr bool is_pm(const hours& __h) noexcept {
88 return __h >= hours(12) && __h < hours(24);
89 }
90
make12(const hours & __h)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
make24(const hours & __h,bool __is_pm)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