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_STEADY_CLOCK_H
11 #define _LIBCPP___CHRONO_STEADY_CLOCK_H
12 
13 #include <__chrono/duration.h>
14 #include <__chrono/time_point.h>
15 #include <__config>
16 
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 #  pragma GCC system_header
19 #endif
20 
21 _LIBCPP_BEGIN_NAMESPACE_STD
22 
23 namespace chrono
24 {
25 
26 #ifndef _LIBCPP_HAS_NO_MONOTONIC_CLOCK
27 class _LIBCPP_TYPE_VIS steady_clock
28 {
29 public:
30     typedef nanoseconds                                   duration;
31     typedef duration::rep                                 rep;
32     typedef duration::period                              period;
33     typedef chrono::time_point<steady_clock, duration>    time_point;
34     static _LIBCPP_CONSTEXPR_SINCE_CXX14 const bool is_steady = true;
35 
36     static time_point now() _NOEXCEPT;
37 };
38 #endif
39 
40 } // namespace chrono
41 
42 _LIBCPP_END_NAMESPACE_STD
43 
44 #endif // _LIBCPP___CHRONO_STEADY_CLOCK_H
45