92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
// { dg-options "-std=gnu++2a" }
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// { dg-do run { target c++2a } }
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// Copyright (C) 2020-2021 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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#include <variant>
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#include <testsuite_hooks.h>
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struct aggressive_aggregate
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{
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int a;
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int b;
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};
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struct dumbo
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{
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dumbo() = delete;
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};
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void test_emplace()
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{
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std::variant<aggressive_aggregate, dumbo> x;
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x.emplace<aggressive_aggregate>(1, 2);
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VERIFY(x.index() == 0);
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VERIFY(std::get<0>(x).a == 1);
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VERIFY(std::get<0>(x).b == 2);
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x.emplace<aggressive_aggregate>(1);
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VERIFY(x.index() == 0);
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VERIFY(std::get<0>(x).a == 1);
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VERIFY(std::get<0>(x).b == 0);
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x.emplace<aggressive_aggregate>();
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VERIFY(x.index() == 0);
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VERIFY(std::get<0>(x).a == 0);
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VERIFY(std::get<0>(x).b == 0);
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}
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void test_in_place_type_construct()
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{
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using Var = std::variant<aggressive_aggregate, dumbo>;
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Var x{std::in_place_type<aggressive_aggregate>, 1,2};
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VERIFY(x.index() == 0);
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VERIFY(std::get<0>(x).a == 1);
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VERIFY(std::get<0>(x).b == 2);
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Var y{std::in_place_type<aggressive_aggregate>, 1};
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VERIFY(y.index() == 0);
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VERIFY(std::get<0>(y).a == 1);
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VERIFY(std::get<0>(y).b == 0);
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Var z{std::in_place_type<aggressive_aggregate>};
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VERIFY(z.index() == 0);
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VERIFY(std::get<0>(z).a == 0);
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VERIFY(std::get<0>(z).b == 0);
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}
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void test_in_place_index_construct()
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{
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using Var = std::variant<aggressive_aggregate, dumbo>;
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Var x{std::in_place_index<0>, 1,2};
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VERIFY(x.index() == 0);
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VERIFY(std::get<0>(x).a == 1);
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VERIFY(std::get<0>(x).b == 2);
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Var y{std::in_place_index<0>, 1};
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VERIFY(y.index() == 0);
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VERIFY(std::get<0>(y).a == 1);
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VERIFY(std::get<0>(y).b == 0);
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Var z{std::in_place_index<0>};
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VERIFY(z.index() == 0);
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VERIFY(std::get<0>(z).a == 0);
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VERIFY(std::get<0>(z).b == 0);
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}
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int main()
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{
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test_emplace();
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test_in_place_type_construct();
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test_in_place_index_construct();
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}
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