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