//===----------------------------------------------------------------------===//
//
// 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_day;
// constexpr year_month_day& operator+=(const months& m) noexcept;
// constexpr year_month_day& operator-=(const months& m) noexcept;
#include <chrono>
#include <cassert>
#include <type_traits>
#include <utility>
#include "test_macros.h"
using year = std::chrono::year;
using month = std::chrono::month;
using day = std::chrono::day;
using year_month_day = std::chrono::year_month_day;
using months = std::chrono::months;
constexpr bool test() {
for (unsigned i = 0; i <= 10; ++i) {
year y{1234};
day d{23};
year_month_day ymd(y, month{i}, d);
ymd += months{2};
assert(ymd.year() == y);
assert(ymd.day() == d);
assert(static_cast<unsigned>((ymd).month()) == i + 2);
ymd -= months{1};
assert(ymd.year() == y);
assert(ymd.day() == d);
assert(static_cast<unsigned>((ymd).month()) == i + 1);
}
{ // Validate the ok status when the day is not present in the new month.
year_month_day ymd{year{2020}, month{3}, day{31}};
ymd += months{1};
assert((ymd == year_month_day{year{2020}, month{4}, day{31}}));
assert(!ymd.ok());
ymd -= months{1};
assert((ymd == year_month_day{year{2020}, month{3}, day{31}}));
assert(ymd.ok());
}
{ // Validate the ok status when the day becomes present in the new month.
year_month_day ymd{year{2020}, month{4}, day{31}};
assert(!ymd.ok());
ymd += months{1};
assert((ymd == year_month_day{year{2020}, month{5}, day{31}}));
assert(ymd.ok());
ymd -= months{2};
assert((ymd == year_month_day{year{2020}, month{3}, day{31}}));
assert(ymd.ok());
}
{ // Test year wrapping
year_month_day ymd{year{2020}, month{4}, day{31}};
ymd += months{12};
assert((ymd == year_month_day{year{2021}, month{4}, day{31}}));
ymd -= months{12};
assert((ymd == year_month_day{year{2020}, month{4}, day{31}}));
}
return true;
}
int main(int, char**) {
ASSERT_NOEXCEPT(std::declval<year_month_day&>() += std::declval<months>());
ASSERT_NOEXCEPT(std::declval<year_month_day&>() -= std::declval<months>());
ASSERT_SAME_TYPE(year_month_day&, decltype(std::declval<year_month_day&>() += std::declval<months>()));
ASSERT_SAME_TYPE(year_month_day&, decltype(std::declval<year_month_day&>() -= std::declval<months>()));
test();
static_assert(test());
return 0;
}