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