libcxx/include/__chrono/file_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_FILE_CLOCK_H
  11 #define _LIBCPP___CHRONO_FILE_CLOCK_H
  12
  13 #include <__availability>
  14 #include <__chrono/duration.h>
  15 #include <__chrono/system_clock.h>
  16 #include <__chrono/time_point.h>
  17 #include <__config>
  18 #include <ratio>
  19
  20 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  21 #  pragma GCC system_header
  22 #endif
  23
  24 #ifndef _LIBCPP_CXX03_LANG
  25 _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
  26 struct _FilesystemClock;
  27 _LIBCPP_END_NAMESPACE_FILESYSTEM
  28 #endif // !_LIBCPP_CXX03_LANG
  29
  30 #if _LIBCPP_STD_VER >= 20
  31
  32 _LIBCPP_BEGIN_NAMESPACE_STD
  33
  34 namespace chrono
  35 {
  36
  37 // [time.clock.file], type file_clock
  38 using file_clock = _VSTD_FS::_FilesystemClock;
  39
  40 template<class _Duration>
  41 using file_time = time_point<file_clock, _Duration>;
  42
  43 } // namespace chrono
  44
  45 _LIBCPP_END_NAMESPACE_STD
  46
  47 #endif // _LIBCPP_STD_VER >= 20
  48
  49 #ifndef _LIBCPP_CXX03_LANG
  50 _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
  51 struct _FilesystemClock {
  52 #if !defined(_LIBCPP_HAS_NO_INT128)
  53   typedef __int128_t rep;
  54   typedef nano period;
  55 #else
  56   typedef long long rep;
  57   typedef nano period;
  58 #endif
  59
  60   typedef chrono::duration<rep, period> duration;
  61   typedef chrono::time_point<_FilesystemClock> time_point;
  62
  63   _LIBCPP_EXPORTED_FROM_ABI
  64   static _LIBCPP_CONSTEXPR_SINCE_CXX14 const bool is_steady = false;
  65
  66   _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_EXPORTED_FROM_ABI static time_point now() noexcept;
  67
  68 #if _LIBCPP_STD_VER >= 20
  69   template <class _Duration>
  70   _LIBCPP_HIDE_FROM_ABI
  71   static chrono::sys_time<_Duration> to_sys(const chrono::file_time<_Duration>& __t) {
  72     return chrono::sys_time<_Duration>(__t.time_since_epoch());
  73   }
  74
  75   template <class _Duration>
  76   _LIBCPP_HIDE_FROM_ABI
  77   static chrono::file_time<_Duration> from_sys(const chrono::sys_time<_Duration>& __t) {
  78     return chrono::file_time<_Duration>(__t.time_since_epoch());
  79   }
  80 #endif // _LIBCPP_STD_VER >= 20
  81 };
  82 _LIBCPP_END_NAMESPACE_FILESYSTEM
  83 #endif // !_LIBCPP_CXX03_LANG
  84
  85 #endif // _LIBCPP___CHRONO_FILE_CLOCK_H