114 lines
3.8 KiB
C++
114 lines
3.8 KiB
C++
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// (C) Copyright Jeremy Siek, 2001.
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// Distributed under the Boost Software License, Version 1.0. (See
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// 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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// See http://www.boost.org/libs/property_map for documentation.
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#ifndef BOOST_PROPERTY_MAP_ITERATOR_HPP
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#define BOOST_PROPERTY_MAP_ITERATOR_HPP
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#include <boost/property_map/property_map.hpp>
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#include <boost/iterator/iterator_adaptor.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/type_traits/is_same.hpp>
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namespace boost {
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//======================================================================
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// property iterator, generalized from ideas by Francois Faure
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namespace detail {
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template <class Iterator, class LvaluePropertyMap>
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class lvalue_pmap_iter
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: public iterator_adaptor< lvalue_pmap_iter< Iterator, LvaluePropertyMap >,
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Iterator,
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typename property_traits<LvaluePropertyMap>::value_type,
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use_default,
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typename property_traits<LvaluePropertyMap>::reference>
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{
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friend class boost::iterator_core_access;
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typedef iterator_adaptor< lvalue_pmap_iter< Iterator, LvaluePropertyMap >,
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Iterator,
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typename property_traits<LvaluePropertyMap>::value_type,
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use_default,
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typename property_traits<LvaluePropertyMap>::reference> super_t;
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public:
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lvalue_pmap_iter() { }
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lvalue_pmap_iter(Iterator const& it,
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LvaluePropertyMap m)
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: super_t(it),
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m_map(m) {}
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private:
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typename super_t::reference
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dereference() const
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{
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return m_map[*(this->base_reference())];
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}
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LvaluePropertyMap m_map;
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};
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template <class Iterator, class ReadablePropertyMap>
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class readable_pmap_iter :
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public iterator_adaptor< readable_pmap_iter< Iterator, ReadablePropertyMap >,
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Iterator,
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typename property_traits<ReadablePropertyMap>::value_type,
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use_default,
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typename property_traits<ReadablePropertyMap>::value_type>
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{
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friend class boost::iterator_core_access;
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typedef iterator_adaptor< readable_pmap_iter< Iterator, ReadablePropertyMap >,
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Iterator,
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typename property_traits<ReadablePropertyMap>::value_type,
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use_default,
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typename property_traits<ReadablePropertyMap>::value_type> super_t;
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public:
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readable_pmap_iter() { }
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readable_pmap_iter(Iterator const& it,
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ReadablePropertyMap m)
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: super_t(it),
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m_map(m) {}
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private:
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typename super_t::reference
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dereference() const
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{
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return get(m_map, *(this->base_reference()));
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}
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ReadablePropertyMap m_map;
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};
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} // namespace detail
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template <class PropertyMap, class Iterator>
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struct property_map_iterator_generator :
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mpl::if_< is_same< typename property_traits<PropertyMap>::category, lvalue_property_map_tag>,
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detail::lvalue_pmap_iter<Iterator, PropertyMap>,
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detail::readable_pmap_iter<Iterator, PropertyMap> >
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{};
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template <class PropertyMap, class Iterator>
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typename property_map_iterator_generator<PropertyMap, Iterator>::type
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make_property_map_iterator(PropertyMap pmap, Iterator iter)
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{
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typedef typename property_map_iterator_generator<PropertyMap,
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Iterator>::type Iter;
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return Iter(iter, pmap);
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}
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} // namespace boost
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#endif // BOOST_PROPERTY_MAP_ITERATOR_HPP
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