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 
24 namespace chrono
25 {
26 
27 class _LIBCPP_TYPE_VIS system_clock
28 {
29 public:
30     typedef microseconds                     duration;
31     typedef duration::rep                    rep;
32     typedef duration::period                 period;
33     typedef chrono::time_point<system_clock> time_point;
34     static _LIBCPP_CONSTEXPR_SINCE_CXX14 const bool is_steady = false;
35 
36     static time_point now() _NOEXCEPT;
37     static time_t     to_time_t  (const time_point& __t) _NOEXCEPT;
38     static time_point from_time_t(time_t __t) _NOEXCEPT;
39 };
40 
41 #if _LIBCPP_STD_VER > 17
42 
43 template <class _Duration>
44 using sys_time    = time_point<system_clock, _Duration>;
45 using sys_seconds = sys_time<seconds>;
46 using sys_days    = sys_time<days>;
47 
48 #endif
49 
50 } // namespace chrono
51 
52 _LIBCPP_END_NAMESPACE_STD
53 
54 #endif // _LIBCPP___CHRONO_SYSTEM_CLOCK_H
55