42 lines
1.8 KiB
C++
42 lines
1.8 KiB
C++
// Copyright (C) 2017 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// { dg-do compile { target c++11 } }
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#include <chrono>
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#include <type_traits>
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using namespace std;
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using namespace std::chrono;
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// DR 1177
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static_assert(is_constructible<duration<float>, duration<double>>{},
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"can convert duration with one floating point rep to another");
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static_assert(is_constructible<duration<float>, duration<int>>{},
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"can convert duration with integral rep to one with floating point rep");
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static_assert(!is_constructible<duration<int>, duration<float>>{},
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"cannot convert duration with floating point rep to one with integral rep");
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static_assert(is_constructible<duration<int>, duration<long>>{},
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"can convert duration with one integral rep to another");
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static_assert(!is_constructible<duration<int>, duration<int, ratio<2,3>>>{},
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"cannot convert duration to one with different period");
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static_assert(is_constructible<duration<float>, duration<int, ratio<2,3>>>{},
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"unless it has a floating-point representation");
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static_assert(is_constructible<duration<float>, duration<int, ratio<1,3>>>{},
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"or a period that is an integral multiple of the original");
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