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