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// { dg-do compile { target c++11 } }
// Copyright (C) 2012-2018 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/>.
// libstdc++/53648
#include <tuple>
#include <type_traits>
using std::tuple;
struct A { };
template class std::tuple<tuple<>>;
template class std::tuple<tuple<tuple<>>>;
template class std::tuple<A, tuple<A, tuple<A, tuple<A>>>>;
template class std::tuple<tuple<tuple<A, A>, A>, A>;
// Verify the following QoI properties are preserved
static_assert( std::is_empty<tuple<>>::value, "tuple<> is empty" );
static_assert( std::is_empty<tuple<tuple<>>>::value,
"tuple<tuple<>> is empty" );
static_assert( sizeof(tuple<char, tuple<>>) == sizeof(char),
"tuple<> is eligible for EBO" );
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