| // { dg-options "-std=gnu++2a" } |
| // { dg-do run { target c++2a } } |
| |
| // Copyright (C) 2020-2023 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 <variant> |
| #include <testsuite_hooks.h> |
| |
| struct aggressive_aggregate |
| { |
| int a; |
| int b; |
| }; |
| |
| struct dumbo |
| { |
| dumbo() = delete; |
| }; |
| |
| void test_emplace() |
| { |
| std::variant<aggressive_aggregate, dumbo> x; |
| x.emplace<aggressive_aggregate>(1, 2); |
| VERIFY(x.index() == 0); |
| VERIFY(std::get<0>(x).a == 1); |
| VERIFY(std::get<0>(x).b == 2); |
| x.emplace<aggressive_aggregate>(1); |
| VERIFY(x.index() == 0); |
| VERIFY(std::get<0>(x).a == 1); |
| VERIFY(std::get<0>(x).b == 0); |
| x.emplace<aggressive_aggregate>(); |
| VERIFY(x.index() == 0); |
| VERIFY(std::get<0>(x).a == 0); |
| VERIFY(std::get<0>(x).b == 0); |
| } |
| |
| void test_in_place_type_construct() |
| { |
| using Var = std::variant<aggressive_aggregate, dumbo>; |
| Var x{std::in_place_type<aggressive_aggregate>, 1,2}; |
| VERIFY(x.index() == 0); |
| VERIFY(std::get<0>(x).a == 1); |
| VERIFY(std::get<0>(x).b == 2); |
| Var y{std::in_place_type<aggressive_aggregate>, 1}; |
| VERIFY(y.index() == 0); |
| VERIFY(std::get<0>(y).a == 1); |
| VERIFY(std::get<0>(y).b == 0); |
| Var z{std::in_place_type<aggressive_aggregate>}; |
| VERIFY(z.index() == 0); |
| VERIFY(std::get<0>(z).a == 0); |
| VERIFY(std::get<0>(z).b == 0); |
| } |
| |
| void test_in_place_index_construct() |
| { |
| using Var = std::variant<aggressive_aggregate, dumbo>; |
| Var x{std::in_place_index<0>, 1,2}; |
| VERIFY(x.index() == 0); |
| VERIFY(std::get<0>(x).a == 1); |
| VERIFY(std::get<0>(x).b == 2); |
| Var y{std::in_place_index<0>, 1}; |
| VERIFY(y.index() == 0); |
| VERIFY(std::get<0>(y).a == 1); |
| VERIFY(std::get<0>(y).b == 0); |
| Var z{std::in_place_index<0>}; |
| VERIFY(z.index() == 0); |
| VERIFY(std::get<0>(z).a == 0); |
| VERIFY(std::get<0>(z).b == 0); |
| } |
| |
| int main() |
| { |
| test_emplace(); |
| test_in_place_type_construct(); |
| test_in_place_index_construct(); |
| } |