57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
/* Copyright 2016 Joaquin M Lopez Munoz.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* See http://www.boost.org/libs/poly_collection for library home page.
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*/
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#ifndef BOOST_POLY_COLLECTION_DETAIL_AUTO_ITERATOR_HPP
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#define BOOST_POLY_COLLECTION_DETAIL_AUTO_ITERATOR_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/iterator/iterator_adaptor.hpp>
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namespace boost{
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namespace poly_collection{
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namespace detail{
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/* auto_iterator<Iterator> (for want of a better name) behaves like Iterator
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* save for the fact that it derefs to Iterator& rather than
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* Iterator::reference. This is useful to "lift" std algorithms so that
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* user-defined predicates are passed iterators that can then be dereferenced
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* internally.
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*/
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template<typename Iterator>
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class auto_iterator:
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public boost::iterator_adaptor<auto_iterator<Iterator>,Iterator,Iterator>
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{
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public:
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auto_iterator()=default;
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auto_iterator(const Iterator& it):auto_iterator::iterator_adaptor_{it}{}
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auto_iterator(const auto_iterator&)=default;
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auto_iterator& operator=(const auto_iterator&)=default;
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private:
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friend class boost::iterator_core_access;
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Iterator& dereference()const noexcept
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{
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return const_cast<auto_iterator*>(this)->base_reference();
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}
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};
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} /* namespace poly_collection::detail */
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} /* namespace poly_collection */
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} /* namespace boost */
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#endif
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