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[thirdparty/gcc.git] / libstdc++-v3 / testsuite / 20_util / as_const / 1.cc

// Copyright (C) 2016-2020 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 }

#include <utility>

#if __cpp_lib_as_const != 201510
# error "__cpp_lib_as_const != 201510"
#endif

int i;
constexpr auto& ci = std::as_const(i);
static_assert( &i == &ci );
static_assert( std::is_same_v<decltype(std::as_const(i)), const int&> );