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1 // (C) Copyright David Abrahams 2002. |
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2 // (C) Copyright Jeremy Siek 2002. |
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3 // (C) Copyright Thomas Witt 2002. |
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4 // Distributed under the Boost Software License, Version 1.0. (See |
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5 // accompanying file LICENSE_1_0.txt or copy at |
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6 // http://www.boost.org/LICENSE_1_0.txt) |
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7 #ifndef BOOST_INDIRECT_ITERATOR_23022003THW_HPP |
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8 #define BOOST_INDIRECT_ITERATOR_23022003THW_HPP |
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9 |
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10 #include <boost/iterator.hpp> |
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11 #include <boost/iterator/iterator_adaptor.hpp> |
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12 |
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13 #include <boost/pointee.hpp> |
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14 #include <boost/indirect_reference.hpp> |
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15 #include <boost/detail/iterator.hpp> |
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16 |
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17 #include <boost/detail/indirect_traits.hpp> |
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18 |
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19 #include <boost/type_traits/is_same.hpp> |
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20 #include <boost/type_traits/add_reference.hpp> |
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21 |
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22 #include <boost/mpl/bool.hpp> |
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23 #include <boost/mpl/identity.hpp> |
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24 #include <boost/mpl/eval_if.hpp> |
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25 #include <boost/mpl/not.hpp> |
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26 #include <boost/mpl/has_xxx.hpp> |
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27 |
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28 #ifdef BOOST_MPL_CFG_NO_HAS_XXX |
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29 # include <boost/shared_ptr.hpp> |
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30 # include <boost/scoped_ptr.hpp> |
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31 # include <boost/mpl/bool.hpp> |
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32 # include <memory> |
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33 #endif |
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34 |
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35 #include <boost/iterator/detail/config_def.hpp> // must be last #include |
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36 |
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37 namespace boost |
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38 { |
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39 template <class Iter, class Value, class Category, class Reference, class Difference> |
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40 class indirect_iterator; |
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41 |
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42 namespace detail |
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43 { |
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44 template <class Iter, class Value, class Category, class Reference, class Difference> |
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45 struct indirect_base |
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46 { |
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47 typedef typename iterator_traits<Iter>::value_type dereferenceable; |
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48 |
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49 typedef iterator_adaptor< |
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50 indirect_iterator<Iter, Value, Category, Reference, Difference> |
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51 , Iter |
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52 , typename ia_dflt_help< |
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53 Value, pointee<dereferenceable> |
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54 >::type |
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55 , Category |
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56 , typename ia_dflt_help< |
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57 Reference |
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58 , mpl::eval_if< |
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59 is_same<Value,use_default> |
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60 , indirect_reference<dereferenceable> |
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61 , add_reference<Value> |
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62 > |
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63 >::type |
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64 , Difference |
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65 > type; |
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66 }; |
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67 |
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68 template <> |
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69 struct indirect_base<int, int, int, int, int> {}; |
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70 } // namespace detail |
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71 |
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72 |
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73 template < |
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74 class Iterator |
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75 , class Value = use_default |
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76 , class Category = use_default |
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77 , class Reference = use_default |
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78 , class Difference = use_default |
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79 > |
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80 class indirect_iterator |
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81 : public detail::indirect_base< |
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82 Iterator, Value, Category, Reference, Difference |
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83 >::type |
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84 { |
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85 typedef typename detail::indirect_base< |
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86 Iterator, Value, Category, Reference, Difference |
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87 >::type super_t; |
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88 |
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89 friend class iterator_core_access; |
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90 |
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91 public: |
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92 indirect_iterator() {} |
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93 |
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94 indirect_iterator(Iterator iter) |
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95 : super_t(iter) {} |
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96 |
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97 template < |
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98 class Iterator2, class Value2, class Category2 |
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99 , class Reference2, class Difference2 |
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100 > |
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101 indirect_iterator( |
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102 indirect_iterator< |
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103 Iterator2, Value2, Category2, Reference2, Difference2 |
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104 > const& y |
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105 , typename enable_if_convertible<Iterator2, Iterator>::type* = 0 |
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106 ) |
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107 : super_t(y.base()) |
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108 {} |
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109 |
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110 private: |
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111 typename super_t::reference dereference() const |
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112 { |
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113 # if BOOST_WORKAROUND(__BORLANDC__, < 0x5A0 ) |
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114 return const_cast<super_t::reference>(**this->base()); |
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115 # else |
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116 return **this->base(); |
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117 # endif |
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118 } |
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119 }; |
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120 |
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121 template <class Iter> |
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122 inline |
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123 indirect_iterator<Iter> make_indirect_iterator(Iter x) |
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124 { |
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125 return indirect_iterator<Iter>(x); |
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126 } |
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127 |
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128 template <class Traits, class Iter> |
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129 inline |
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130 indirect_iterator<Iter,Traits> make_indirect_iterator(Iter x, Traits* = 0) |
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131 { |
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132 return indirect_iterator<Iter, Traits>(x); |
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133 } |
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134 |
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135 } // namespace boost |
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136 |
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137 #include <boost/iterator/detail/config_undef.hpp> |
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138 |
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139 #endif // BOOST_INDIRECT_ITERATOR_23022003THW_HPP |