81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
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/* A "next" iterator for GDB, the GNU debugger.
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Copyright (C) 2019-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef COMMON_NEXT_ITERATOR_H
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#define COMMON_NEXT_ITERATOR_H
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#include "gdbsupport/iterator-range.h"
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/* An iterator that uses the 'next' field of a type to iterate. This
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can be used with various GDB types that are stored as linked
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lists. */
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template<typename T>
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struct next_iterator
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{
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typedef next_iterator self_type;
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typedef T *value_type;
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typedef T *&reference;
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typedef T **pointer;
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typedef std::forward_iterator_tag iterator_category;
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typedef int difference_type;
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explicit next_iterator (T *item)
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: m_item (item)
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{
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}
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/* Create a one-past-the-end iterator. */
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next_iterator ()
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: m_item (nullptr)
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{
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}
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value_type operator* () const
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{
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return m_item;
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}
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bool operator== (const self_type &other) const
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{
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return m_item == other.m_item;
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}
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bool operator!= (const self_type &other) const
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{
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return m_item != other.m_item;
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}
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self_type &operator++ ()
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{
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m_item = m_item->next;
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return *this;
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}
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private:
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T *m_item;
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};
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/* A convenience wrapper to make a range type around a next_iterator. */
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template <typename T>
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using next_range = iterator_range<next_iterator<T>>;
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#endif /* COMMON_NEXT_ITERATOR_H */
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