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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
// <chrono>
// class day;
// constexpr day& operator+=(const days& d) noexcept;
// constexpr day& operator-=(const days& d) noexcept;
#include <chrono>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
template <typename D, typename Ds>
constexpr bool testConstexpr()
{
D d1{1};
if (static_cast<unsigned>(d1 += Ds{ 1}) != 2) return false;
if (static_cast<unsigned>(d1 += Ds{ 2}) != 4) return false;
if (static_cast<unsigned>(d1 += Ds{22}) != 26) return false;
if (static_cast<unsigned>(d1 -= Ds{ 1}) != 25) return false;
if (static_cast<unsigned>(d1 -= Ds{ 2}) != 23) return false;
if (static_cast<unsigned>(d1 -= Ds{22}) != 1) return false;
return true;
}
int main()
{
using day = std::chrono::day;
using days = std::chrono::days;
ASSERT_NOEXCEPT(std::declval<day&>() += std::declval<days>());
ASSERT_NOEXCEPT(std::declval<day&>() -= std::declval<days>());
ASSERT_SAME_TYPE(day&, decltype(std::declval<day&>() += std::declval<days>()));
ASSERT_SAME_TYPE(day&, decltype(std::declval<day&>() -= std::declval<days>()));
static_assert(testConstexpr<day, days>(), "");
for (unsigned i = 0; i <= 10; ++i)
{
day day(i);
assert(static_cast<unsigned>(day += days{22}) == i + 22);
assert(static_cast<unsigned>(day) == i + 22);
assert(static_cast<unsigned>(day -= days{12}) == i + 10);
assert(static_cast<unsigned>(day) == i + 10);
}
}
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