libstdc++: ctime Source File

libstdc++

ctime
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1// -*- C++ -*- forwarding header.
2
3// Copyright (C) 1997-2026 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14// GNU General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25/** @file include/ctime
26 * This is a Standard C++ Library file. You should @c \#include this file
27 * in your programs, rather than any of the @a *.h implementation files.
28 *
29 * This is the C++ version of the Standard C Library header @c time.h,
30 * and its contents are (mostly) the same as that header, but are all
31 * contained in the namespace @c std (except for names which are defined
32 * as macros in C).
33 */
34
35//
36// ISO C++ 14882: 20.5 Date and time
37//
38
39#ifndef _GLIBCXX_CTIME
40#define _GLIBCXX_CTIME 1
41
42#ifdef _GLIBCXX_SYSHDR
43#pragma GCC system_header
44#endif
45
46#include <bits/c++config.h>
47#include <time.h>
48
49// Get rid of those macros defined in <time.h> in lieu of real functions.
50#undef clock
51#undef difftime
52#undef mktime
53#undef time
54#undef asctime
55#undef ctime
56#undef gmtime
57#undef localtime
58#undef strftime
59
60namespace std
61{
62 using ::clock_t;
63 using ::time_t;
64 using ::tm;
65
66 using ::clock;
67 using ::difftime;
68 using ::mktime;
69 using ::time;
70 using ::asctime;
71 using ::ctime;
72 using ::gmtime;
73 using ::localtime;
74 using ::strftime;
75} // namespace
76
77#if __cplusplus >= 201703L && defined(_GLIBCXX_HAVE_TIMESPEC_GET)
78#undef timespec_get
79namespace std
80{
81 using ::timespec;
82 using ::timespec_get;
83} // namespace std
84#endif
85
86#endif
c++config.h
std
ISO C++ entities toplevel namespace is std.