1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556 |
- /* Copyright 2016 Joaquin M Lopez Munoz.
- * Distributed under the Boost Software License, Version 1.0.
- * (See accompanying file LICENSE_1_0.txt or copy at
- * http://www.boost.org/LICENSE_1_0.txt)
- *
- * See http://www.boost.org/libs/poly_collection for library home page.
- */
- #ifndef BOOST_POLY_COLLECTION_DETAIL_AUTO_ITERATOR_HPP
- #define BOOST_POLY_COLLECTION_DETAIL_AUTO_ITERATOR_HPP
- #if defined(_MSC_VER)
- #pragma once
- #endif
- #include <boost/iterator/iterator_adaptor.hpp>
- namespace boost{
- namespace poly_collection{
- namespace detail{
- /* auto_iterator<Iterator> (for want of a better name) behaves like Iterator
- * save for the fact that it derefs to Iterator& rather than
- * Iterator::reference. This is useful to "lift" std algorithms so that
- * user-defined predicates are passed iterators that can then be dereferenced
- * internally.
- */
- template<typename Iterator>
- class auto_iterator:
- public boost::iterator_adaptor<auto_iterator<Iterator>,Iterator,Iterator>
- {
- public:
- auto_iterator()=default;
- auto_iterator(const Iterator& it):auto_iterator::iterator_adaptor_{it}{}
- auto_iterator(const auto_iterator&)=default;
- auto_iterator& operator=(const auto_iterator&)=default;
- private:
- friend class boost::iterator_core_access;
- Iterator& dereference()const noexcept
- {
- return const_cast<auto_iterator*>(this)->base_reference();
- }
- };
- } /* namespace poly_collection::detail */
- } /* namespace poly_collection */
- } /* namespace boost */
- #endif
|