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// { dg-do run { target c++20 } }
// Copyright (C) 2021-2025 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// Class year [time.cal.year_month_day]
#include <chrono>
#include <testsuite_hooks.h>
// Slow but clear test for leap year.
constexpr bool
is_leap_year(const std::chrono::year& y) noexcept
{
const int n = static_cast<int>(y);
return n % 4 == 0 && (n % 100 != 0 || n % 400 == 0);
}
void test01()
{
using namespace std::chrono;
year y{-32767};
while (y < year{32767}) {
VERIFY( y.is_leap() == is_leap_year(y) );
++y;
}
// One more for y = 32767.
VERIFY( year{32767}.is_leap() == is_leap_year(year{32767}) );
}
int main()
{
test01();
return 0;
}
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