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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
// <chrono>
// class weekday;
// constexpr weekday& operator+=(const days& d) noexcept;
// constexpr weekday& operator-=(const days& d) noexcept;
#include <chrono>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
#include "../../euclidian.h"
template <typename M, typename Ms>
constexpr bool testConstexpr()
{
M m1{1};
if (static_cast<unsigned>(m1 += Ms{ 1}) != 2) return false;
if (static_cast<unsigned>(m1 += Ms{ 2}) != 4) return false;
if (static_cast<unsigned>(m1 += Ms{ 4}) != 1) return false;
if (static_cast<unsigned>(m1 -= Ms{ 1}) != 0) return false;
if (static_cast<unsigned>(m1 -= Ms{ 2}) != 5) return false;
if (static_cast<unsigned>(m1 -= Ms{ 4}) != 1) return false;
return true;
}
int main()
{
using weekday = std::chrono::weekday;
using days = std::chrono::days;
ASSERT_NOEXCEPT( std::declval<weekday&>() += std::declval<days&>());
ASSERT_SAME_TYPE(weekday&, decltype(std::declval<weekday&>() += std::declval<days&>()));
ASSERT_NOEXCEPT( std::declval<weekday&>() -= std::declval<days&>());
ASSERT_SAME_TYPE(weekday&, decltype(std::declval<weekday&>() -= std::declval<days&>()));
static_assert(testConstexpr<weekday, days>(), "");
for (unsigned i = 0; i <= 6; ++i)
{
weekday wd(i);
assert((static_cast<unsigned>(wd += days{3}) == euclidian_addition<unsigned, 0, 6>(i, 3)));
assert((static_cast<unsigned>(wd) == euclidian_addition<unsigned, 0, 6>(i, 3)));
}
for (unsigned i = 0; i <= 6; ++i)
{
weekday wd(i);
assert((static_cast<unsigned>(wd -= days{4}) == euclidian_subtraction<unsigned, 0, 6>(i, 4)));
assert((static_cast<unsigned>(wd) == euclidian_subtraction<unsigned, 0, 6>(i, 4)));
}
}
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