1// { dg-options "-std=gnu++11" }
2// { dg-do compile }
3
4// Copyright (C) 2012-2015 Free Software Foundation, Inc.
5//
6// This file is part of the GNU ISO C++ Library.  This library is free
7// software; you can redistribute it and/or modify it under the
8// terms of the GNU General Public License as published by the
9// Free Software Foundation; either version 3, or (at your option)
10// any later version.
11
12// This library is distributed in the hope that it will be useful,
13// but WITHOUT ANY WARRANTY; without even the implied warranty of
14// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15// GNU General Public License for more details.
16
17// You should have received a copy of the GNU General Public License along
18// with this library; see the file COPYING3.  If not see
19// <http://www.gnu.org/licenses/>.
20
21// libstdc++/53648
22
23#include <tuple>
24#include <type_traits>
25
26using std::tuple;
27
28struct A { };
29
30template class std::tuple<tuple<>>;
31template class std::tuple<tuple<tuple<>>>;
32template class std::tuple<A, tuple<A, tuple<A, tuple<A>>>>;
33template class std::tuple<tuple<tuple<A, A>, A>, A>;
34
35// Verify the following QoI properties are preserved
36
37static_assert( std::is_empty<tuple<>>::value, "tuple<> is empty" );
38
39static_assert( std::is_empty<tuple<tuple<>>>::value,
40               "tuple<tuple<>> is empty" );
41
42static_assert( sizeof(tuple<char, tuple<>>) == sizeof(char),
43               "tuple<> is eligible for EBO" );
44
45