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60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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// <chrono>
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// class day;
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// constexpr day operator+(const day& x, const days& y) noexcept;
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// Returns: day(unsigned{x} + y.count()).
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//
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// constexpr day operator+(const days& x, const day& y) noexcept;
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// Returns: y + x.
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#include <chrono>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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template <typename D, typename Ds>
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constexpr bool testConstexpr()
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{
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D d{1};
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Ds offset{23};
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if (d + offset != D{24}) return false;
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if (offset + d != D{24}) return false;
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return true;
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}
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int main()
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{
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using day = std::chrono::day;
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using days = std::chrono::days;
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ASSERT_NOEXCEPT(std::declval<day>() + std::declval<days>());
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ASSERT_NOEXCEPT(std::declval<days>() + std::declval<day>());
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ASSERT_SAME_TYPE(day, decltype(std::declval<day>() + std::declval<days>()));
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ASSERT_SAME_TYPE(day, decltype(std::declval<days>() + std::declval<day>()));
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static_assert(testConstexpr<day, days>(), "");
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day dy{12};
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for (unsigned i = 0; i <= 10; ++i)
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{
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day d1 = dy + days{i};
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day d2 = days{i} + dy;
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assert(d1 == d2);
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assert(static_cast<unsigned>(d1) == i + 12);
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assert(static_cast<unsigned>(d2) == i + 12);
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}
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}
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