// { dg-do compile { target c++20 } } // Copyright (C) 2020-2025 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 // . // Class template day [time.cal.month] #include #include constexpr void constexpr_month() { using namespace std::chrono; month dm{}; ++(++dm); dm++; --(--dm); dm--; dm += months{3}; dm -= months{3}; // Test for UB (overflow). { using rep = months::rep; using std::numeric_limits; auto constexpr months_min = months{numeric_limits::min()}; auto constexpr month_000_plus_months_min = month{ 0 } + months_min; auto constexpr month_255_plus_months_min = month{255} + months_min; auto constexpr month_000_minus_months_min = month{ 0 } - months_min; auto constexpr month_255_minus_months_min = month{255} - months_min; auto constexpr months_max = months{numeric_limits::max()}; auto constexpr month_000_plus_months_max = month{ 0 } + months_max; auto constexpr month_255_plus_months_max = month{255} + months_max; auto constexpr month_000_minus_months_max = month{ 0 } - months_max; auto constexpr month_255_minus_months_max = month{255} - months_max; } static_assert(February + months{11} == January); static_assert(January + months{1200} == January); static_assert(January + months{1201} == February); static_assert(months{-1200} + January == January); static_assert(months{-1201} + January == December); static_assert(January - months{1200} == January); static_assert(January - months{-1200} == January); static_assert(January - months{1201} == December); static_assert(January - February == months{11}); static_assert(February - January == months{1}); static_assert(June - June == months{}); static_assert(++month{4} == month{5}); static_assert(month{4}++ == month{4}); static_assert(--month{4} == month{3}); static_assert(month{4}-- == month{4}); static_assert((month{4} += months{3}) == month{7}); static_assert((month{4} -= months{3}) == month{1}); static_assert(!month{}.ok()); static_assert(month{1}.ok()); static_assert(month{12}.ok()); static_assert(!month{13}.ok()); static_assert(unsigned{month{7}} == 7); static_assert(!(month{0} == month{1})); static_assert( (month{0} != month{2})); static_assert( (month{0} < month{3})); static_assert(!(month{0} > month{4})); static_assert( (month{0} <= month{5})); static_assert(!(month{0} >= month{6})); static_assert(month{0} <=> month{1} == std::strong_ordering::less); static_assert(month{3} <=> month{3} == std::strong_ordering::equal); static_assert(month{5} <=> month{2} == std::strong_ordering::greater); }