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