gcc/libstdc++-v3/testsuite/20_util/variant/deduction.cc
2021-01-04 10:26:59 +01:00

40 lines
1.2 KiB
C++

// { dg-options "-std=gnu++17" }
// { dg-do compile { target c++17 } }
// Copyright (C) 2017-2021 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/>.
#include <variant>
template<typename T, typename U> struct require_same;
template<typename T> struct require_same<T, T> { using type = void; };
template<typename T, typename U>
typename require_same<T, U>::type
check_type(U&) { }
void
test01()
{
std::variant<int, double> x(3);
std::variant copy = x;
check_type<decltype(x)>(copy);
std::variant move = std::move(x);
check_type<decltype(x)>(move);
}