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// Copyright (C) 2015-2018 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-options "-std=gnu++17" }
// { dg-do compile { target c++17 } }
#include <numeric>
#ifndef __cpp_lib_gcd_lcm
# error "Feature-test macro for gcd missing"
#elif __cpp_lib_gcd_lcm != 201606
# error "Feature-test macro for gcd has wrong value"
#endif
using std::gcd;
static_assert( gcd(1071, 462) == 21, "" );
static_assert( gcd(2000, 20) == 20, "" );
static_assert( gcd(2011, 17) == 1, "GCD of two primes is 1" );
static_assert( gcd(200, 200) == 200, "GCD of equal numbers is that number" );
static_assert( gcd(0, 13) == 13, "GCD of any number and 0 is that number" );
static_assert( gcd(29, 0) == 29, "GCD of any number and 0 is that number" );
static_assert( gcd(0, 0) == 0, "" );
static_assert(gcd(1u, 2) == 1, "unsigned and signed");
static_assert(gcd(3, 4u) == 1, "signed and unsigned");
static_assert(gcd(5u, 6u) == 1, "unsigned and unsigned");
static_assert( std::is_same_v<decltype(gcd(1l, 1)), long> );
static_assert( std::is_same_v<decltype(gcd(1ul, 1ull)), unsigned long long> );
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