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_EXPORTED_FROM_ABI 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