| // Copyright (C) 2015-2023 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/>. |
| |
| // { dg-do compile { target c++17 } } |
| |
| #include <numeric> |
| |
| #ifndef __cpp_lib_gcd_lcm |
| # error "Feature-test macro for lcm missing" |
| #elif __cpp_lib_gcd_lcm != 201606 |
| # error "Feature-test macro for lcm has wrong value" |
| #endif |
| |
| using std::lcm; |
| |
| static_assert(lcm(21, 6) == 42, ""); |
| static_assert(lcm(41, 0) == 0, "LCD with zero is zero"); |
| static_assert(lcm(0, 7) == 0, "LCD with zero is zero"); |
| static_assert(lcm(0, 0) == 0, "no division by zero"); |
| |
| static_assert(lcm(1u, 2) == 2, "unsigned and signed"); |
| static_assert(lcm(3, 4u) == 12, "signed and unsigned"); |
| static_assert(lcm(5u, 6u) == 30, "unsigned and unsigned"); |
| |
| static_assert( std::is_same_v<decltype(lcm(1l, 1)), long> ); |
| static_assert( std::is_same_v<decltype(lcm(1ul, 1ull)), unsigned long long> ); |
