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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++03, c++11, c++14, c++17
// <chrono>
// class weekday;
// constexpr weekday& operator--() noexcept;
// constexpr weekday operator--(int) noexcept;
#include <chrono>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
#include "../../euclidian.h"
template <typename WD>
constexpr bool testConstexpr()
{
WD wd{1};
if ((--wd).c_encoding() != 0) return false;
if ((wd--).c_encoding() != 0) return false;
if ((wd).c_encoding() != 6) return false;
return true;
}
int main(int, char**)
{
using weekday = std::chrono::weekday;
ASSERT_NOEXCEPT(--(std::declval<weekday&>()) );
ASSERT_NOEXCEPT( (std::declval<weekday&>())--);
ASSERT_SAME_TYPE(weekday , decltype( std::declval<weekday&>()--));
ASSERT_SAME_TYPE(weekday&, decltype(--std::declval<weekday&>() ));
static_assert(testConstexpr<weekday>(), "");
for (unsigned i = 0; i <= 6; ++i)
{
weekday wd(i);
assert(((--wd).c_encoding() == euclidian_subtraction<unsigned, 0, 6>(i, 1)));
assert(((wd--).c_encoding() == euclidian_subtraction<unsigned, 0, 6>(i, 1)));
assert(((wd) .c_encoding() == euclidian_subtraction<unsigned, 0, 6>(i, 2)));
}
return 0;
}
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