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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 month;
// constexpr month& operator+=(const month& d) noexcept;
// constexpr month& operator-=(const month& d) noexcept;
#include <chrono>
#include <type_traits>
#include <cassert>
#include "test_macros.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{ 8}) != 12) return false;
if (static_cast<unsigned>(m1 -= Ms{ 1}) != 11) return false;
if (static_cast<unsigned>(m1 -= Ms{ 2}) != 9) return false;
if (static_cast<unsigned>(m1 -= Ms{ 8}) != 1) return false;
return true;
}
int main(int, char**)
{
using month = std::chrono::month;
using months = std::chrono::months;
ASSERT_NOEXCEPT(std::declval<month&>() += std::declval<months&>());
ASSERT_NOEXCEPT(std::declval<month&>() -= std::declval<months&>());
ASSERT_SAME_TYPE(month&, decltype(std::declval<month&>() += std::declval<months&>()));
ASSERT_SAME_TYPE(month&, decltype(std::declval<month&>() -= std::declval<months&>()));
static_assert(testConstexpr<month, months>(), "");
for (unsigned i = 1; i <= 10; ++i)
{
month m(i);
int exp = i + 10;
while (exp > 12)
exp -= 12;
assert(static_cast<unsigned>(m += months{10}) == static_cast<unsigned>(exp));
assert(static_cast<unsigned>(m) == static_cast<unsigned>(exp));
}
for (unsigned i = 1; i <= 10; ++i)
{
month m(i);
int exp = i - 9;
while (exp < 1)
exp += 12;
assert(static_cast<unsigned>(m -= months{ 9}) == static_cast<unsigned>(exp));
assert(static_cast<unsigned>(m) == static_cast<unsigned>(exp));
}
return 0;
}
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