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78 lines
2.3 KiB
C++
78 lines
2.3 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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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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// <chrono>
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// class weekday;
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// constexpr weekday operator-(const weekday& x, const days& y) noexcept;
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// Returns: x + -y.
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//
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// constexpr days operator-(const weekday& x, const weekday& y) noexcept;
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// Returns: If x.ok() == true and y.ok() == true, returns a value d in the range
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// [days{0}, days{6}] satisfying y + d == x.
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// Otherwise the value returned is unspecified.
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// [Example: Sunday - Monday == days{6}. —end example]
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extern "C" int printf(const char *, ...);
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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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#include "../../euclidian.h"
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template <typename WD, typename Ds>
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constexpr bool testConstexpr()
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{
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{
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WD wd{5};
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Ds offset{3};
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if (wd - offset != WD{2}) return false;
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if (wd - WD{2} != offset) return false;
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}
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// Check the example
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if (WD{0} - WD{1} != Ds{6}) return false;
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return true;
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}
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int main(int, char**)
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{
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using weekday = std::chrono::weekday;
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using days = std::chrono::days;
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ASSERT_NOEXCEPT( std::declval<weekday>() - std::declval<days>());
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ASSERT_SAME_TYPE(weekday, decltype(std::declval<weekday>() - std::declval<days>()));
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ASSERT_NOEXCEPT( std::declval<weekday>() - std::declval<weekday>());
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ASSERT_SAME_TYPE(days, decltype(std::declval<weekday>() - std::declval<weekday>()));
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static_assert(testConstexpr<weekday, days>(), "");
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for (unsigned i = 0; i <= 6; ++i)
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for (unsigned j = 0; j <= 6; ++j)
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{
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weekday wd = weekday{i} - days{j};
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assert(wd + days{j} == weekday{i});
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assert((static_cast<unsigned>(wd) == euclidian_subtraction<unsigned, 0, 6>(i, j)));
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}
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for (unsigned i = 0; i <= 6; ++i)
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for (unsigned j = 0; j <= 6; ++j)
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{
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days d = weekday{j} - weekday{i};
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assert(weekday{i} + d == weekday{j});
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}
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return 0;
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}
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