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 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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