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/* A "next" iterator for GDB, the GNU debugger.
Copyright (C) 2019-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program 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 of the License, or
(at your option) any later version.
This program 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 program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef COMMON_NEXT_ITERATOR_H
#define COMMON_NEXT_ITERATOR_H
/* An iterator that uses the 'next' field of a type to iterate. This
can be used with various GDB types that are stored as linked
lists. */
template<typename T>
struct next_iterator
{
typedef next_iterator self_type;
typedef T *value_type;
typedef T *&reference;
typedef T **pointer;
typedef std::forward_iterator_tag iterator_category;
typedef int difference_type;
explicit next_iterator (T *item)
: m_item (item)
{
}
/* Create a one-past-the-end iterator. */
next_iterator ()
: m_item (nullptr)
{
}
value_type operator* () const
{
return m_item;
}
bool operator== (const self_type &other) const
{
return m_item == other.m_item;
}
bool operator!= (const self_type &other) const
{
return m_item != other.m_item;
}
self_type &operator++ ()
{
m_item = m_item->next;
return *this;
}
private:
T *m_item;
};
/* A range adapter that allows iterating over a linked list. */
template<typename T, typename Iterator = next_iterator<T>>
class next_adapter
{
public:
explicit next_adapter (T *item)
: m_item (item)
{
}
using iterator = Iterator;
iterator begin () const
{
return iterator (m_item);
}
iterator end () const
{
return iterator ();
}
private:
T *m_item;
};
#endif /* COMMON_NEXT_ITERATOR_H */
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