| // { dg-options "-std=gnu++1y" } |
| // { dg-do run } |
| |
| // Copyright (C) 2013-2014 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 moved_to of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| #include <experimental/optional> |
| #include <testsuite_hooks.h> |
| |
| int counter = 0; |
| |
| struct mixin_counter |
| { |
| mixin_counter() { ++counter; } |
| mixin_counter(mixin_counter const&) { ++counter; } |
| ~mixin_counter() { --counter; } |
| }; |
| |
| struct value_type : private mixin_counter { }; |
| |
| int main() |
| { |
| using O = std::experimental::optional<value_type>; |
| |
| // Check std::experimental::nullopt_t and 'default' (= {}) assignment |
| |
| { |
| O o; |
| o = std::experimental::nullopt; |
| VERIFY( !o ); |
| } |
| |
| { |
| O o { std::experimental::in_place }; |
| o = std::experimental::nullopt; |
| VERIFY( !o ); |
| } |
| |
| { |
| O o; |
| o = {}; |
| VERIFY( !o ); |
| } |
| |
| { |
| O o { std::experimental::in_place }; |
| o = {}; |
| VERIFY( !o ); |
| } |
| |
| VERIFY( counter == 0 ); |
| } |