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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;
// constexpr year operator-(const year& x, const years& y) noexcept;
// Returns: x + -y.
//
// constexpr years operator-(const year& x, const year& y) noexcept;
// Returns: If x.ok() == true and y.ok() == true, returns a value m in the range
// [years{0}, years{11}] satisfying y + m == x.
// Otherwise the value returned is unspecified.
// [Example: January - February == years{11}. —end example]
extern "C" int printf(const char *, ...);
#include <chrono>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
template <typename Y, typename Ys>
constexpr bool testConstexpr()
{
Y y{2313};
Ys offset{1006};
if (y - offset != Y{1307}) return false;
if (y - Y{1307} != offset) return false;
return true;
}
int main(int, char**)
{
using year = std::chrono::year;
using years = std::chrono::years;
ASSERT_NOEXCEPT( std::declval<year>() - std::declval<years>());
ASSERT_SAME_TYPE(year , decltype(std::declval<year>() - std::declval<years>()));
ASSERT_NOEXCEPT( std::declval<year>() - std::declval<year>());
ASSERT_SAME_TYPE(years, decltype(std::declval<year>() - std::declval<year>()));
static_assert(testConstexpr<year, years>(), "");
year y{1223};
for (int i = 1100; i <= 1110; ++i)
{
year y1 = y - years{i};
years ys1 = y - year{i};
assert(static_cast<int>(y1) == 1223 - i);
assert(ys1.count() == 1223 - i);
}
return 0;
}
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