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 #ifndef _LIBCPP_HAS_NO_MONOTONIC_CLOCK
26 class _LIBCPP_EXPORTED_FROM_ABI steady_clock {
27 public:
28   typedef nanoseconds duration;
29   typedef duration::rep rep;
30   typedef duration::period period;
31   typedef chrono::time_point<steady_clock, duration> time_point;
32   static _LIBCPP_CONSTEXPR_SINCE_CXX14 const bool is_steady = true;
33 
34   static time_point now() _NOEXCEPT;
35 };
36 #endif
37 
38 } // namespace chrono
39 
40 _LIBCPP_END_NAMESPACE_STD
41 
42 #endif // _LIBCPP___CHRONO_STEADY_CLOCK_H
43