1 // Compatibility symbols for previous versions, C++0x bits -*- C++ -*-
3 // Copyright (C) 2013-2023 Free Software Foundation, Inc.
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)
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.
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.
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/>.
25 #include <bits/c++config.h>
27 #if _GLIBCXX_INLINE_VERSION
28 # error "compatibility-thread-c++0x.cc is not needed for gnu-versioned-namespace"
31 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
33 #ifdef _GLIBCXX_USE_GETTIMEOFDAY
37 #define system_clock system_clockXX
38 #define steady_clock steady_clockXX
43 namespace std
_GLIBCXX_VISIBILITY(default)
45 _GLIBCXX_BEGIN_NAMESPACE_VERSION
49 // NB: Default configuration was no realtime.
52 #ifdef _GLIBCXX_USE_GETTIMEOFDAY
53 typedef chrono::microseconds duration
;
55 typedef chrono::seconds duration
;
58 typedef duration::rep rep
;
59 typedef duration::period period
;
60 typedef chrono::time_point
<system_clock
, duration
> time_point
;
62 static_assert(system_clock::duration::min()
63 < system_clock::duration::zero(),
64 "a clock's minimum duration cannot be less than its epoch");
66 static constexpr bool is_steady
= false;
72 constexpr bool system_clock::is_steady
;
74 system_clock::time_point
75 system_clock::now() noexcept
77 #ifdef _GLIBCXX_USE_GETTIMEOFDAY
81 return time_point(duration(chrono::seconds(tv
.tv_sec
)
82 + chrono::microseconds(tv
.tv_usec
)));
84 std::time_t __sec
= std::time(0);
85 // This is the conversion done by system_clock::from_time_t(__sec)
86 typedef chrono::time_point
<system_clock
, seconds
> __from
;
87 return time_point_cast
<system_clock::duration
>
88 (__from(chrono::seconds(__sec
)));
93 _GLIBCXX_END_NAMESPACE_VERSION
96 #endif // _GLIBCXX_USE_C99_STDINT_TR1