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- /* An iterator wrapper that yields pointers instead of references.
- Copyright (C) 2021-2022 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 GDBSUPPORT_REFERENCE_TO_POINTER_ITERATOR_H
- #define GDBSUPPORT_REFERENCE_TO_POINTER_ITERATOR_H
- /* Wrap an iterator that yields references to objects so that it yields
- pointers to objects instead.
- This is useful for example to bridge the gap between iterators on intrusive
- lists, which yield references, and the rest of GDB, which for legacy reasons
- expects to iterate on pointers. */
- template <typename IteratorType>
- struct reference_to_pointer_iterator
- {
- using self_type = reference_to_pointer_iterator;
- using value_type = typename IteratorType::value_type *;
- using reference = typename IteratorType::value_type *&;
- using pointer = typename IteratorType::value_type **;
- using iterator_category = typename IteratorType::iterator_category;
- using difference_type = typename IteratorType::difference_type;
- /* Construct a reference_to_pointer_iterator, passing args to the underyling
- iterator. */
- template <typename... Args>
- reference_to_pointer_iterator (Args &&...args)
- : m_it (std::forward<Args> (args)...)
- {}
- /* Create a past-the-end iterator.
- Assumes that default-constructing an underlying iterator creates a
- past-the-end iterator. */
- reference_to_pointer_iterator ()
- {}
- /* Need these as the variadic constructor would be a better match
- otherwise. */
- reference_to_pointer_iterator (reference_to_pointer_iterator &) = default;
- reference_to_pointer_iterator (const reference_to_pointer_iterator &) = default;
- reference_to_pointer_iterator (reference_to_pointer_iterator &&) = default;
- reference_to_pointer_iterator &operator= (const reference_to_pointer_iterator &) = default;
- reference_to_pointer_iterator &operator= (reference_to_pointer_iterator &&) = default;
- value_type operator* () const
- { return &*m_it; }
- self_type &operator++ ()
- {
- ++m_it;
- return *this;
- }
- bool operator== (const self_type &other) const
- { return m_it == other.m_it; }
- bool operator!= (const self_type &other) const
- { return m_it != other.m_it; }
- private:
- /* The underlying iterator. */
- IteratorType m_it;
- };
- #endif /* GDBSUPPORT_REFERENCE_TO_POINTER_ITERATOR_H */
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