1 // { dg-do compile { target c++11 } }
2 
3 // Copyright (C) 2012-2018 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library.  This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10 
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 // GNU General Public License for more details.
15 
16 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING3.  If not see
18 // <http://www.gnu.org/licenses/>.
19 
20 // libstdc++/53648
21 
22 #include <tuple>
23 #include <type_traits>
24 
25 using std::tuple;
26 
27 struct A { };
28 
29 template class std::tuple<tuple<>>;
30 template class std::tuple<tuple<tuple<>>>;
31 template class std::tuple<A, tuple<A, tuple<A, tuple<A>>>>;
32 template class std::tuple<tuple<tuple<A, A>, A>, A>;
33 
34 // Verify the following QoI properties are preserved
35 
36 static_assert( std::is_empty<tuple<>>::value, "tuple<> is empty" );
37 
38 static_assert( std::is_empty<tuple<tuple<>>>::value,
39                "tuple<tuple<>> is empty" );
40 
41 static_assert( sizeof(tuple<char, tuple<>>) == sizeof(char),
42                "tuple<> is eligible for EBO" );
43 
44