| // 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 namespace std; |
| using namespace std::chrono; |
| |
| // DR 1177 |
| static_assert(is_constructible<duration<float>, duration<double>>{}, |
| "can convert duration with one floating point rep to another"); |
| static_assert(is_constructible<duration<float>, duration<int>>{}, |
| "can convert duration with integral rep to one with floating point rep"); |
| static_assert(!is_constructible<duration<int>, duration<float>>{}, |
| "cannot convert duration with floating point rep to one with integral rep"); |
| static_assert(is_constructible<duration<int>, duration<long>>{}, |
| "can convert duration with one integral rep to another"); |
| |
| static_assert(!is_constructible<duration<int>, duration<int, ratio<2,3>>>{}, |
| "cannot convert duration to one with different period"); |
| static_assert(is_constructible<duration<float>, duration<int, ratio<2,3>>>{}, |
| "... unless the result type has a floating-point representation"); |
| static_assert(is_constructible<duration<int, ratio<1,3>>, duration<int>>{}, |
| "... or the original's period is a multiple of the result's period"); |
