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// Copyright (C) 2020-2022 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/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { target c++2a } }
#include <iterator>
#include <testsuite_hooks.h>
struct value { int n; };
struct sentinel { int limit; };
struct iterator
{
using iterator_category = std::input_iterator_tag;
using value_type = value;
using difference_type = std::ptrdiff_t;
using reference = value;
constexpr value operator*() const { return value{counter}; }
constexpr iterator& operator++() { ++counter; return *this; }
constexpr iterator operator++(int) { auto i = *this; ++counter; return i; }
constexpr bool operator==(sentinel s) const { return counter == s.limit; }
int counter = 0;
};
constexpr bool
test01()
{
iterator i;
sentinel s{2};
std::common_iterator<iterator, sentinel> begin = i, end = s;
VERIFY( begin->n == 0 );
++begin;
VERIFY( begin->n == 1 );
++begin;
VERIFY( begin == end );
return true;
}
int
main()
{
constexpr bool b1 = test01();
}
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