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
25struct _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
33namespace chrono {
34
35// [time.clock.file], type file_clock
36using file_clock = filesystem::_FilesystemClock;
37
38template <class _Duration>
39using 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
49struct _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