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_SYSTEM_CLOCK_H 11 #define _LIBCPP___CHRONO_SYSTEM_CLOCK_H 12 13 #include <__chrono/duration.h> 14 #include <__chrono/time_point.h> 15 #include <__config> 16 #include <ctime> 17 18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19 # pragma GCC system_header 20 #endif 21 22 _LIBCPP_BEGIN_NAMESPACE_STD 23 24 namespace chrono { 25 26 class _LIBCPP_EXPORTED_FROM_ABI system_clock { 27 public: 28 typedef microseconds duration; 29 typedef duration::rep rep; 30 typedef duration::period period; 31 typedef chrono::time_point<system_clock> time_point; 32 static _LIBCPP_CONSTEXPR_SINCE_CXX14 const bool is_steady = false; 33 34 static time_point now() _NOEXCEPT; 35 static time_t to_time_t(const time_point& __t) _NOEXCEPT; 36 static time_point from_time_t(time_t __t) _NOEXCEPT; 37 }; 38 39 #if _LIBCPP_STD_VER >= 20 40 41 template <class _Duration> 42 using sys_time = time_point<system_clock, _Duration>; 43 using sys_seconds = sys_time<seconds>; 44 using sys_days = sys_time<days>; 45 46 #endif 47 48 } // namespace chrono 49 50 _LIBCPP_END_NAMESPACE_STD 51 52 #endif // _LIBCPP___CHRONO_SYSTEM_CLOCK_H 53