libstdc++-v3/testsuite/std/time/year_month_day/2.cc

   1 // { dg-do compile { target c++20 } }
   2
   3 // Copyright (C) 2020-2024 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // Class template year_month_day [time.cal.year_month_day]
  21
  22 #include <chrono>
  23
  24 constexpr void
  25 constexpr_year_month_day_op_overload_disambiguation()
  26 {
  27   using namespace std::chrono;
  28   using decades = duration<long long, std::ratio<31556952 * 10>>;
  29   static_assert(std::convertible_to<decades, months>
  30                 && std::convertible_to<decades, years>);
  31   using ymd = year_month_day;
  32
  33   constexpr ymd ymd1 = 2015y/June/15d;
  34   static_assert(ymd1 + decades{1} == 2025y/June/15d);
  35   static_assert(ymd1 - decades{1} == 2005y/June/15d);
  36   static_assert(decades{1} + ymd1 == 2025y/June/15d);
  37   static_assert((ymd{ymd1} += decades{1}) == 2025y/June/15d);
  38   static_assert((ymd{ymd1} -= decades{1}) == 2005y/June/15d);
  39 }