libcxx/include/__chrono/steady_clock.h

   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_AFTER_CXX11 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