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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 compile { target c++2a } }
#include <iterator>
struct bidi_iterator
{
// No nested reference and pointer types.
// No iterator_category.
// cpp17-iterator requirements:
int& operator*() const;
bidi_iterator& operator++();
bidi_iterator operator++(int);
// cpp17-input-iterator requirements:
friend bool operator==(const bidi_iterator&, const bidi_iterator&);
using difference_type = long long;
using value_type = int;
// cpp17-forward-iterator requirements:
bidi_iterator();
// cpp17-bidirectional-iterator requirements:
bidi_iterator& operator--();
bidi_iterator operator--(int);
};
void
test01()
{
// PR libstdc++/97935
// Missing subsumption in iterator category detection
using namespace std;
static_assert(__detail::__cpp17_bidi_iterator<bidi_iterator>);
static_assert(same_as<iterator_traits<bidi_iterator>::iterator_category,
bidirectional_iterator_tag>,
"PR libstdc++/97935");
}
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