| 1 | // (C) Copyright Jeremy Siek, 2001. |
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| 2 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 3 | // accompanying file LICENSE_1_0.txt or copy at |
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| 4 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 5 | |
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| 6 | // See http://www.boost.org/libs/property_map for documentation. |
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| 7 | |
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| 8 | #ifndef BOOST_PROPERTY_MAP_ITERATOR_HPP |
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| 9 | #define BOOST_PROPERTY_MAP_ITERATOR_HPP |
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| 10 | |
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| 11 | #include <boost/property_map.hpp> |
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| 12 | #include <boost/iterator/iterator_adaptor.hpp> |
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| 13 | #include <boost/mpl/if.hpp> |
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| 14 | #include <boost/type_traits/is_same.hpp> |
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| 15 | |
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| 16 | namespace boost { |
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| 17 | |
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| 18 | //====================================================================== |
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| 19 | // property iterator, generalized from ideas by François Faure |
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| 20 | |
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| 21 | namespace detail { |
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| 22 | |
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| 23 | template <class Iterator, class LvaluePropertyMap> |
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| 24 | class lvalue_pmap_iter |
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| 25 | : public iterator_adaptor< lvalue_pmap_iter< Iterator, LvaluePropertyMap >, |
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| 26 | Iterator, |
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| 27 | typename property_traits<LvaluePropertyMap>::value_type, |
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| 28 | use_default, |
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| 29 | typename property_traits<LvaluePropertyMap>::reference> |
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| 30 | { |
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| 31 | friend class boost::iterator_core_access; |
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| 32 | |
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| 33 | typedef iterator_adaptor< lvalue_pmap_iter< Iterator, LvaluePropertyMap >, |
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| 34 | Iterator, |
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| 35 | typename property_traits<LvaluePropertyMap>::value_type, |
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| 36 | use_default, |
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| 37 | typename property_traits<LvaluePropertyMap>::reference> super_t; |
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| 38 | |
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| 39 | public: |
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| 40 | lvalue_pmap_iter() { } |
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| 41 | lvalue_pmap_iter(Iterator const& it, |
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| 42 | LvaluePropertyMap m) |
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| 43 | : super_t(it), |
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| 44 | m_map(m) {} |
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| 45 | |
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| 46 | private: |
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| 47 | typename super_t::reference |
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| 48 | dereference() const |
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| 49 | { |
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| 50 | return m_map[*(this->base_reference())]; |
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| 51 | } |
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| 52 | |
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| 53 | LvaluePropertyMap m_map; |
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| 54 | }; |
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| 55 | |
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| 56 | template <class Iterator, class ReadablePropertyMap> |
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| 57 | class readable_pmap_iter : |
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| 58 | public iterator_adaptor< readable_pmap_iter< Iterator, ReadablePropertyMap >, |
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| 59 | Iterator, |
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| 60 | typename property_traits<ReadablePropertyMap>::value_type, |
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| 61 | use_default, |
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| 62 | typename property_traits<ReadablePropertyMap>::value_type> |
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| 63 | |
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| 64 | |
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| 65 | { |
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| 66 | friend class boost::iterator_core_access; |
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| 67 | |
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| 68 | typedef iterator_adaptor< readable_pmap_iter< Iterator, ReadablePropertyMap >, |
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| 69 | Iterator, |
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| 70 | typename property_traits<ReadablePropertyMap>::value_type, |
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| 71 | use_default, |
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| 72 | typename property_traits<ReadablePropertyMap>::value_type> super_t; |
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| 73 | |
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| 74 | public: |
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| 75 | readable_pmap_iter() { } |
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| 76 | readable_pmap_iter(Iterator const& it, |
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| 77 | ReadablePropertyMap m) |
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| 78 | : super_t(it), |
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| 79 | m_map(m) {} |
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| 80 | |
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| 81 | private: |
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| 82 | typename super_t::reference |
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| 83 | dereference() const |
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| 84 | { |
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| 85 | return get(m_map, *(this->base_reference())); |
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| 86 | } |
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| 87 | |
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| 88 | ReadablePropertyMap m_map; |
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| 89 | }; |
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| 90 | |
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| 91 | |
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| 92 | } // namespace detail |
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| 93 | |
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| 94 | template <class PropertyMap, class Iterator> |
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| 95 | struct property_map_iterator_generator : |
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| 96 | mpl::if_< is_same< typename property_traits<PropertyMap>::category, lvalue_property_map_tag>, |
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| 97 | detail::lvalue_pmap_iter<Iterator, PropertyMap>, |
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| 98 | detail::readable_pmap_iter<Iterator, PropertyMap> > |
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| 99 | {}; |
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| 100 | |
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| 101 | template <class PropertyMap, class Iterator> |
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| 102 | typename property_map_iterator_generator<PropertyMap, Iterator>::type |
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| 103 | make_property_map_iterator(PropertyMap pmap, Iterator iter) |
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| 104 | { |
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| 105 | typedef typename property_map_iterator_generator<PropertyMap, |
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| 106 | Iterator>::type Iter; |
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| 107 | return Iter(iter, pmap); |
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| 108 | } |
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| 109 | |
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| 110 | } // namespace boost |
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| 111 | |
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| 112 | #endif // BOOST_PROPERTY_MAP_ITERATOR_HPP |
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| 113 | |
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