64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
// Copyright (C) 2019-2021 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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// 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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// 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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// { dg-options "-std=gnu++2a" }
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// { dg-do run { target c++2a } }
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#include <variant>
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#include <testsuite_hooks.h>
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void
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test01()
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{
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struct Visitor
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{
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int operator()(int, void*) const { return 0; }
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int operator()(char& c, void* p) const { return &c == p; }
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int operator()(int i, const char* s) const { return s[i] == '\0'; }
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int operator()(char c, const char* s) const { return c == *s; }
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};
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std::variant<int, char> v1{'c'};
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std::variant<void*, const char*> v2{"chars"};
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auto res = std::visit<bool>(Visitor{}, v1, v2);
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static_assert(std::is_same_v<decltype(res), bool>);
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VERIFY( res == true );
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static_assert(std::is_void_v<decltype(std::visit<void>(Visitor{}, v1, v2))>);
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}
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void test02()
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{
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struct Visitor
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{
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int operator()(double) {return 42;}
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double operator()(int) {return 0.02;}
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};
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std::variant<int, double> v;
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std::visit<int>(Visitor(), v);
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std::visit<const void>(Visitor(), v);
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}
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int
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main()
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{
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test01();
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test02();
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}
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