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_SYSTEM_CLOCK_H
11#define _LIBCPP___CHRONO_SYSTEM_CLOCK_H
12
13#include <__chrono/duration.h>
14#include <__chrono/time_point.h>
15#include <__config>
16#include <ctime>
17
18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19# pragma GCC system_header
20#endif
21
22_LIBCPP_BEGIN_NAMESPACE_STD
23_LIBCPP_BEGIN_EXPLICIT_ABI_ANNOTATIONS
24
25namespace chrono {
26
27class _LIBCPP_EXPORTED_FROM_ABI system_clock {
28public:
29 typedef microseconds duration;
30 typedef duration::rep rep;
31 typedef duration::period period;
32 typedef chrono::time_point<system_clock> time_point;
33 static _LIBCPP_CONSTEXPR_SINCE_CXX14 const bool is_steady = false;
34
35 [[__nodiscard__]] static time_point now() _NOEXCEPT;
36 [[__nodiscard__]] static time_t to_time_t(const time_point& __t) _NOEXCEPT;
37 [[__nodiscard__]] static time_point from_time_t(time_t __t) _NOEXCEPT;
38};
39
40#if _LIBCPP_STD_VER >= 20
41
42template <class _Duration>
43using sys_time = time_point<system_clock, _Duration>;
44using sys_seconds = sys_time<seconds>;
45using sys_days = sys_time<days>;
46
47#endif
48
49} // namespace chrono
50
51_LIBCPP_END_EXPLICIT_ABI_ANNOTATIONS
52_LIBCPP_END_NAMESPACE_STD
53
54#endif // _LIBCPP___CHRONO_SYSTEM_CLOCK_H
55