88 lines
2.7 KiB
C++
88 lines
2.7 KiB
C++
/* A forward filtered iterator for GDB, the GNU debugger.
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Copyright (C) 2018-2020 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_FILTERED_ITERATOR_H
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#define COMMON_FILTERED_ITERATOR_H
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/* A filtered iterator. This wraps BaseIterator and automatically
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skips elements that FilterFunc filters out. Requires that
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default-constructing a BaseIterator creates a valid one-past-end
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iterator. */
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template<typename BaseIterator, typename FilterFunc>
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class filtered_iterator
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{
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public:
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typedef filtered_iterator self_type;
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typedef typename BaseIterator::value_type value_type;
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typedef typename BaseIterator::reference reference;
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typedef typename BaseIterator::pointer pointer;
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typedef typename BaseIterator::iterator_category iterator_category;
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typedef typename BaseIterator::difference_type difference_type;
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/* Construct by forwarding all arguments to the underlying
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iterator. */
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template<typename... Args>
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explicit filtered_iterator (Args &&...args)
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: m_it (std::forward<Args> (args)...)
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{ skip_filtered (); }
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/* Create a one-past-end iterator. */
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filtered_iterator () = default;
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/* Need these as the variadic constructor would be a better match
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otherwise. */
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filtered_iterator (filtered_iterator &) = default;
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filtered_iterator (const filtered_iterator &) = default;
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filtered_iterator (filtered_iterator &&) = default;
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filtered_iterator (const filtered_iterator &&other)
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: filtered_iterator (static_cast<const filtered_iterator &> (other))
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{}
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value_type operator* () const { return *m_it; }
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self_type &operator++ ()
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{
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++m_it;
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skip_filtered ();
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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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void skip_filtered ()
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{
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for (; m_it != m_end; ++m_it)
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if (m_filter (*m_it))
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break;
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}
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private:
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FilterFunc m_filter {};
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BaseIterator m_it {};
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BaseIterator m_end {};
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};
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#endif /* COMMON_FILTERED_ITERATOR_H */
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