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a945c346 | 1 | // Copyright (C) 2017-2024 Free Software Foundation, Inc. |
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2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
18 | // { dg-do compile { target c++11 } } | |
19 | ||
20 | #include <chrono> | |
21 | #include <type_traits> | |
22 | ||
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23 | using std::is_constructible; |
24 | using std::chrono::seconds; | |
25 | using std::chrono::milliseconds; | |
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26 | |
27 | template <class Duration> | |
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28 | using sys_time |
29 | = std::chrono::time_point<std::chrono::system_clock, Duration>; | |
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30 | |
31 | static_assert(is_constructible<sys_time<milliseconds>, sys_time<seconds>>{}, | |
32 | "Can construct time_point from one with lower precision duration"); | |
33 | ||
34 | // PR libstdc++/81468 - DR 1177 | |
35 | static_assert(!is_constructible<sys_time<seconds>, sys_time<milliseconds>>{}, | |
36 | "Cannot construct time_point from one with higher precision duration"); |