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49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <chrono>
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// duration
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// constexpr common_type_t<duration> operator-() const;
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#include <chrono>
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#include <cassert>
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#include "test_macros.h"
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int main(int, char**)
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{
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{
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const std::chrono::minutes m(3);
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std::chrono::minutes m2 = -m;
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assert(m2.count() == -m.count());
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}
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#if TEST_STD_VER >= 11
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{
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constexpr std::chrono::minutes m(3);
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constexpr std::chrono::minutes m2 = -m;
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static_assert(m2.count() == -m.count(), "");
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}
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#endif
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// P0548
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{
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typedef std::chrono::duration<int, std::ratio<10,10> > D10;
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typedef std::chrono::duration<int, std::ratio< 1, 1> > D1;
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D10 zero(0);
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D10 one(1);
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static_assert( (std::is_same< decltype(-one), decltype(zero-one) >::value), "");
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static_assert( (std::is_same< decltype(zero-one), D1>::value), "");
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static_assert( (std::is_same< decltype(-one), D1>::value), "");
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static_assert( (std::is_same< decltype(+one), D1>::value), "");
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}
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return 0;
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}
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