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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, 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 (static_cast<unsigned>(--wd) != 0) return false;
if (static_cast<unsigned>(wd--) != 0) return false;
if (static_cast<unsigned>(wd) != 6) return false;
return true;
}
int main()
{
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((static_cast<unsigned>(--wd) == euclidian_subtraction<unsigned, 0, 6>(i, 1)));
assert((static_cast<unsigned>(wd--) == euclidian_subtraction<unsigned, 0, 6>(i, 1)));
assert((static_cast<unsigned>(wd) == euclidian_subtraction<unsigned, 0, 6>(i, 2)));
}
}
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