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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 year_month;
// constexpr year_month& operator+=(const months& d) noexcept;
// constexpr year_month& operator-=(const months& d) noexcept;
#include <chrono>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
template <typename D, typename Ds>
constexpr bool testConstexpr(D d1)
{
if (static_cast<unsigned>((d1 ).month()) != 1) return false;
if (static_cast<unsigned>((d1 += Ds{ 1}).month()) != 2) return false;
if (static_cast<unsigned>((d1 += Ds{ 2}).month()) != 4) return false;
if (static_cast<unsigned>((d1 += Ds{12}).month()) != 4) return false;
if (static_cast<unsigned>((d1 -= Ds{ 1}).month()) != 3) return false;
if (static_cast<unsigned>((d1 -= Ds{ 2}).month()) != 1) return false;
if (static_cast<unsigned>((d1 -= Ds{12}).month()) != 1) return false;
return true;
}
int main(int, char**)
{
using month = std::chrono::month;
using months = std::chrono::months;
using year = std::chrono::year;
using year_month = std::chrono::year_month;
ASSERT_NOEXCEPT( std::declval<year_month&>() += std::declval<months>());
ASSERT_SAME_TYPE(year_month&, decltype(std::declval<year_month&>() += std::declval<months>()));
ASSERT_NOEXCEPT( std::declval<year_month&>() -= std::declval<months>());
ASSERT_SAME_TYPE(year_month&, decltype(std::declval<year_month&>() -= std::declval<months>()));
static_assert(testConstexpr<year_month, months>(year_month{year{1234}, month{1}}), "");
for (unsigned i = 0; i <= 10; ++i)
{
year y{1234};
year_month ym(y, month{i});
assert(static_cast<unsigned>((ym += months{2}).month()) == i + 2);
assert(ym.year() == y);
assert(static_cast<unsigned>((ym ).month()) == i + 2);
assert(ym.year() == y);
assert(static_cast<unsigned>((ym -= months{1}).month()) == i + 1);
assert(ym.year() == y);
assert(static_cast<unsigned>((ym ).month()) == i + 1);
assert(ym.year() == y);
}
return 0;
}
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