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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++98, c++03, c++11, c++14, c++17
// <chrono>
// class year_month_day_last;
// constexpr year_month_day_last
// operator-(const year_month_day_last& ymdl, const months& dm) noexcept;
//
// Returns: ymdl + (-dm).
//
// constexpr year_month_day_last
// operator-(const year_month_day_last& ymdl, const years& dy) noexcept;
//
// Returns: ymdl + (-dy).
#include <chrono>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
#include <iostream>
constexpr bool testConstexprYears (std::chrono::year_month_day_last ymdl)
{
std::chrono::year_month_day_last ym1 = ymdl - std::chrono::years{10};
return
ym1.year() == std::chrono::year{static_cast<int>(ymdl.year()) - 10}
&& ym1.month() == ymdl.month()
;
}
constexpr bool testConstexprMonths (std::chrono::year_month_day_last ymdl)
{
std::chrono::year_month_day_last ym1 = ymdl - std::chrono::months{6};
return
ym1.year() == ymdl.year()
&& ym1.month() == std::chrono::month{static_cast<unsigned>(ymdl.month()) - 6}
;
}
int main()
{
using year = std::chrono::year;
using month = std::chrono::month;
using month_day_last = std::chrono::month_day_last;
using year_month_day_last = std::chrono::year_month_day_last;
using months = std::chrono::months;
using years = std::chrono::years;
constexpr month December = std::chrono::December;
{ // year_month_day_last - years
ASSERT_NOEXCEPT( std::declval<year_month_day_last>() - std::declval<years>());
ASSERT_SAME_TYPE(year_month_day_last, decltype(std::declval<year_month_day_last>() - std::declval<years>()));
static_assert(testConstexprYears(year_month_day_last{year{1234}, month_day_last{December}}), "");
year_month_day_last ym{year{1234}, month_day_last{December}};
for (int i = 0; i <= 10; ++i)
{
year_month_day_last ym1 = ym - years{i};
assert(static_cast<int>(ym1.year()) == 1234 - i);
assert(ym1.month() == December);
}
}
{ // year_month_day_last - months
ASSERT_NOEXCEPT( std::declval<year_month_day_last>() - std::declval<months>());
ASSERT_SAME_TYPE(year_month_day_last, decltype(std::declval<year_month_day_last>() - std::declval<months>()));
static_assert(testConstexprMonths(year_month_day_last{year{1234}, month_day_last{December}}), "");
// TODO test wrapping
year_month_day_last ym{year{1234}, month_day_last{December}};
for (unsigned i = 0; i <= 10; ++i)
{
year_month_day_last ym1 = ym - months{i};
assert(static_cast<int>(ym1.year()) == 1234);
assert(static_cast<unsigned>(ym1.month()) == 12U-i);
}
}
}
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