libcxx/include/__chrono/system_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_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_AFTER_CXX11 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