| // { dg-options "-std=gnu++11" } |
| // { dg-do compile } |
| |
| // Copyright (C) 2012-2014 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/>. |
| |
| #include <array> |
| #include <typeindex> |
| #include <typeinfo> |
| |
| template < typename ...Types > |
| union super_union; |
| |
| template < > |
| union super_union<> |
| { |
| static auto optioned_types() -> std::array<std::type_index, 0> |
| { return std::array<std::type_index, 0>{ {} }; } |
| }; |
| |
| template < typename Head, typename ...Tail > |
| union super_union<Head, Tail...> |
| { |
| static |
| auto optioned_types() -> std::array<std::type_index, 1 + sizeof...(Tail)> |
| { |
| using std::type_index; |
| |
| return { {type_index(typeid(Head)), type_index(typeid(Tail))...} }; |
| } |
| |
| Head data; |
| super_union<Tail...> rest; |
| }; |
