xref: /freebsd/contrib/llvm-project/libcxx/include/__chrono/file_clock.h (revision fe75646a0234a261c0013bf1840fdac4acaf0cec)
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
86