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679acd561c
For the same reason as the previous patches (making things easier to understand, at the cost of being more explicit), change reference_to_pointer_iterator's constructor to take an already built underlying iterator. There are no uses of this utility in the code base right now, so no callers to update. Change-Id: Ifadb4c3a5ee53a8d0eb6c0d79efcc92271492e8e Approved-By: Tom Tromey <tom@tromey.com>
100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
/* An iterator wrapper that yields pointers instead of references.
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Copyright (C) 2021-2025 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 GDBSUPPORT_REFERENCE_TO_POINTER_ITERATOR_H
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#define GDBSUPPORT_REFERENCE_TO_POINTER_ITERATOR_H
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/* Wrap an iterator that yields references to objects so that it yields
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pointers to objects instead.
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This is useful for example to bridge the gap between iterators on intrusive
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lists, which yield references, and the rest of GDB, which for legacy reasons
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expects to iterate on pointers. */
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template <typename IteratorType>
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struct reference_to_pointer_iterator
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{
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using self_type = reference_to_pointer_iterator;
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using value_type = typename IteratorType::value_type *;
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using reference = typename IteratorType::value_type *&;
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using pointer = typename IteratorType::value_type **;
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using iterator_category = typename IteratorType::iterator_category;
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using difference_type = typename IteratorType::difference_type;
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/* Construct a reference_to_pointer_iterator, passing args to the underlying
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iterator. */
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explicit reference_to_pointer_iterator (IteratorType it)
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: m_it (std::move (it))
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{}
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/* Create a past-the-end iterator.
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Assumes that default-constructing an underlying iterator creates a
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past-the-end iterator. */
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reference_to_pointer_iterator ()
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{}
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/* Need these as the variadic constructor would be a better match
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otherwise. */
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reference_to_pointer_iterator (reference_to_pointer_iterator &) = default;
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reference_to_pointer_iterator (const reference_to_pointer_iterator &) = default;
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reference_to_pointer_iterator (reference_to_pointer_iterator &&) = default;
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reference_to_pointer_iterator &operator= (const reference_to_pointer_iterator &) = default;
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reference_to_pointer_iterator &operator= (reference_to_pointer_iterator &&) = default;
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value_type operator* () const
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{ return &*m_it; }
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self_type &operator++ ()
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{
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++m_it;
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return *this;
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}
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self_type &operator++ (int)
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{
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m_it++;
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return *this;
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}
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self_type &operator-- ()
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{
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--m_it;
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return *this;
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}
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self_type &operator-- (int)
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{
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m_it--;
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return *this;
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}
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bool operator== (const self_type &other) const
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{ return m_it == other.m_it; }
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bool operator!= (const self_type &other) const
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{ return m_it != other.m_it; }
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private:
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/* The underlying iterator. */
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IteratorType m_it;
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};
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#endif /* GDBSUPPORT_REFERENCE_TO_POINTER_ITERATOR_H */
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