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// { dg-do run { target c++11 } }
// Copyright (C) 2011-2024 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/>.
// Tuple
#include <tuple>
#include <testsuite_hooks.h>
void
test01()
{
using namespace std;
VERIFY( tuple_size<const tuple<> >::value == 0 );
VERIFY( tuple_size<volatile tuple<int> >::value == 1 );
VERIFY( tuple_size<const volatile tuple<void> >::value == 1 );
typedef tuple<int, const int&, void> test_tuple1;
VERIFY( tuple_size<const test_tuple1>::value == 3 );
VERIFY( tuple_size<const volatile test_tuple1>::value == 3 );
VERIFY( tuple_size<volatile tuple<tuple<void> > >::value == 1 );
}
int main()
{
test01();
return 0;
}
// LWG DR 2770. tuple_size<const T> specialization is not SFINAE compatible
template<typename T, typename = void>
struct has_value : std::false_type { };
template<typename T>
struct has_value<T, std::__void_t<decltype(T::value)>> : std::true_type { };
static_assert( !has_value<std::tuple_size<int>>::value, "" );
static_assert( !has_value<std::tuple_size<const int>>::value, "" );
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