| // Copyright (C) 2017-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-do compile { target c++11 } } |
| |
| #include <chrono> |
| #include <type_traits> |
| |
| using std::is_constructible; |
| using std::chrono::seconds; |
| using std::chrono::milliseconds; |
| |
| template <class Duration> |
| using sys_time |
| = std::chrono::time_point<std::chrono::system_clock, Duration>; |
| |
| static_assert(is_constructible<sys_time<milliseconds>, sys_time<seconds>>{}, |
| "Can construct time_point from one with lower precision duration"); |
| |
| // PR libstdc++/81468 - DR 1177 |
| static_assert(!is_constructible<sys_time<seconds>, sys_time<milliseconds>>{}, |
| "Cannot construct time_point from one with higher precision duration"); |
