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 27 class _LIBCPP_TYPE_VIS system_clock 28 { 29 public: 30 typedef microseconds duration; 31 typedef duration::rep rep; 32 typedef duration::period period; 33 typedef chrono::time_point<system_clock> time_point; 34 static _LIBCPP_CONSTEXPR_SINCE_CXX14 const bool is_steady = false; 35 36 static time_point now() _NOEXCEPT; 37 static time_t to_time_t (const time_point& __t) _NOEXCEPT; 38 static time_point from_time_t(time_t __t) _NOEXCEPT; 39 }; 40 41 #if _LIBCPP_STD_VER > 17 42 43 template <class _Duration> 44 using sys_time = time_point<system_clock, _Duration>; 45 using sys_seconds = sys_time<seconds>; 46 using sys_days = sys_time<days>; 47 48 #endif 49 50 } // namespace chrono 51 52 _LIBCPP_END_NAMESPACE_STD 53 54 #endif // _LIBCPP___CHRONO_SYSTEM_CLOCK_H 55