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 #if _LIBCPP_HAS_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