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 <__chrono/duration.h>
  14 #include <__chrono/system_clock.h>
  15 #include <__chrono/time_point.h>
  16 #include <__config>
  17 #include <ratio>
  18
  19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  20 #  pragma GCC system_header
  21 #endif
  22
  23 #ifndef _LIBCPP_CXX03_LANG
  24 _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
  25 struct _FilesystemClock;
  26 _LIBCPP_END_NAMESPACE_FILESYSTEM
  27 #endif // !_LIBCPP_CXX03_LANG
  28
  29 #if _LIBCPP_STD_VER >= 20
  30
  31 _LIBCPP_BEGIN_NAMESPACE_STD
  32
  33 namespace chrono {
  34
  35 // [time.clock.file], type file_clock
  36 using file_clock = filesystem::_FilesystemClock;
  37
  38 template <class _Duration>
  39 using file_time = time_point<file_clock, _Duration>;
  40
  41 } // namespace chrono
  42
  43 _LIBCPP_END_NAMESPACE_STD
  44
  45 #endif // _LIBCPP_STD_VER >= 20
  46
  47 #ifndef _LIBCPP_CXX03_LANG
  48 _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
  49 struct _FilesystemClock {
  50 #  if _LIBCPP_HAS_INT128
  51   typedef __int128_t rep;
  52   typedef nano period;
  53 #  else
  54   typedef long long rep;
  55   typedef nano period;
  56 #  endif
  57
  58   typedef chrono::duration<rep, period> duration;
  59   typedef chrono::time_point<_FilesystemClock> time_point;
  60
  61   _LIBCPP_EXPORTED_FROM_ABI static _LIBCPP_CONSTEXPR_SINCE_CXX14 const bool is_steady = false;
  62
  63   _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_EXPORTED_FROM_ABI static time_point now() noexcept;
  64
  65 #  if _LIBCPP_STD_VER >= 20
  66   template <class _Duration>
  67   _LIBCPP_HIDE_FROM_ABI static chrono::sys_time<_Duration> to_sys(const chrono::file_time<_Duration>& __t) {
  68     return chrono::sys_time<_Duration>(__t.time_since_epoch());
  69   }
  70
  71   template <class _Duration>
  72   _LIBCPP_HIDE_FROM_ABI static chrono::file_time<_Duration> from_sys(const chrono::sys_time<_Duration>& __t) {
  73     return chrono::file_time<_Duration>(__t.time_since_epoch());
  74   }
  75 #  endif // _LIBCPP_STD_VER >= 20
  76 };
  77 _LIBCPP_END_NAMESPACE_FILESYSTEM
  78 #endif // !_LIBCPP_CXX03_LANG
  79
  80 #endif // _LIBCPP___CHRONO_FILE_CLOCK_H