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1 // Boost.Range library |
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2 // |
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3 // Copyright Thorsten Ottosen 2003-2004. Use, modification and |
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4 // distribution is subject to the Boost Software License, Version |
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5 // 1.0. (See 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 // |
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8 // For more information, see http://www.boost.org/libs/range/ |
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9 // |
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10 |
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11 #ifndef BOOST_RANGE_SUB_RANGE_HPP |
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12 #define BOOST_RANGE_SUB_RANGE_HPP |
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13 |
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14 #include <boost/range/config.hpp> |
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15 #include <boost/range/iterator_range.hpp> |
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16 #include <boost/range/value_type.hpp> |
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17 #include <boost/range/result_iterator.hpp> |
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18 #include <boost/range/size_type.hpp> |
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19 #include <boost/range/difference_type.hpp> |
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20 #include <boost/assert.hpp> |
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21 |
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22 namespace boost |
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23 { |
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24 |
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25 template< class ForwardRange > |
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26 class sub_range : public iterator_range< BOOST_DEDUCED_TYPENAME range_result_iterator<ForwardRange>::type > |
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27 { |
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28 typedef BOOST_DEDUCED_TYPENAME range_result_iterator<ForwardRange>::type iterator_t; |
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29 typedef iterator_range< iterator_t > base; |
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30 |
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31 typedef BOOST_DEDUCED_TYPENAME base::impl impl; |
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32 public: |
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33 typedef BOOST_DEDUCED_TYPENAME range_value<ForwardRange>::type value_type; |
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34 typedef BOOST_DEDUCED_TYPENAME range_result_iterator<ForwardRange>::type iterator; |
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35 typedef BOOST_DEDUCED_TYPENAME range_const_iterator<ForwardRange>::type const_iterator; |
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36 typedef BOOST_DEDUCED_TYPENAME range_difference<ForwardRange>::type difference_type; |
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37 typedef BOOST_DEDUCED_TYPENAME range_size<ForwardRange>::type size_type; |
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38 typedef BOOST_DEDUCED_TYPENAME base::reference reference; |
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39 typedef BOOST_DEDUCED_TYPENAME iterator_reference<const_iterator>::type const_reference; |
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40 |
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41 public: |
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42 sub_range() : base() |
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43 { } |
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44 |
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45 /* |
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46 template< class ForwardRange2 > |
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47 sub_range( sub_range<ForwardRange2> r ) : |
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48 |
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49 #if BOOST_WORKAROUND(BOOST_INTEL_CXX_VERSION, <= 800 ) |
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50 base( impl::adl_begin( r ), impl::adl_end( r ) ) |
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51 #else |
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52 base( r ) |
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53 #endif */ |
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54 |
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55 template< class ForwardRange2 > |
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56 sub_range( ForwardRange2& r ) : |
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57 |
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58 #if BOOST_WORKAROUND(BOOST_INTEL_CXX_VERSION, <= 800 ) |
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59 base( impl::adl_begin( r ), impl::adl_end( r ) ) |
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60 #else |
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61 base( r ) |
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62 #endif |
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63 { } |
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64 |
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65 template< class ForwardRange2 > |
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66 sub_range( const ForwardRange2& r ) : |
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67 |
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68 #if BOOST_WORKAROUND(BOOST_INTEL_CXX_VERSION, <= 800 ) |
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69 base( impl::adl_begin( r ), impl::adl_end( r ) ) |
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70 #else |
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71 base( r ) |
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72 #endif |
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73 { } |
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74 |
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75 template< class Iter > |
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76 sub_range( Iter first, Iter last ) : |
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77 base( first, last ) |
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78 { } |
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79 |
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80 template< class ForwardRange2 > |
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81 sub_range& operator=( ForwardRange2& r ) |
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82 { |
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83 base::operator=( r ); |
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84 return *this; |
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85 } |
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86 |
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87 template< class ForwardRange2 > |
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88 sub_range& operator=( const ForwardRange2& r ) |
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89 { |
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90 base::operator=( r ); |
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91 return *this; |
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92 } |
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93 |
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94 sub_range& operator=( sub_range r ) |
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95 { |
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96 // |
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97 // argument passed by value to avoid |
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98 // const_iterator to iterator conversion |
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99 // |
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100 base::operator=( r ); |
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101 return *this; |
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102 } |
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103 |
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104 public: |
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105 |
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106 iterator begin() { return base::begin(); } |
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107 const_iterator begin() const { return base::begin(); } |
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108 iterator end() { return base::end(); } |
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109 const_iterator end() const { return base::end(); } |
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110 size_type size() const { return base::size(); } |
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111 |
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112 |
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113 public: // convenience |
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114 reference front() |
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115 { |
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116 return base::front(); |
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117 } |
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118 |
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119 const_reference front() const |
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120 { |
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121 return base::front(); |
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122 } |
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123 |
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124 reference back() |
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125 { |
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126 return base::back(); |
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127 } |
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128 |
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129 const_reference back() const |
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130 { |
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131 return base::back(); |
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132 } |
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133 |
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134 reference operator[]( size_type sz ) |
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135 { |
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136 return base::operator[](sz); |
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137 } |
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138 |
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139 const_reference operator[]( size_type sz ) const |
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140 { |
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141 return base::operator[](sz); |
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142 } |
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143 |
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144 }; |
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145 |
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146 template< class ForwardRange, class ForwardRange2 > |
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147 inline bool operator==( const sub_range<ForwardRange>& l, |
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148 const sub_range<ForwardRange2>& r ) |
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149 { |
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150 return iterator_range_detail::equal( l, r ); |
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151 } |
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152 |
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153 template< class ForwardRange, class ForwardRange2 > |
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154 inline bool operator!=( const sub_range<ForwardRange>& l, |
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155 const sub_range<ForwardRange2>& r ) |
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156 { |
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157 return !iterator_range_detail::equal( l, r ); |
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158 } |
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159 |
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160 template< class ForwardRange, class ForwardRange2 > |
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161 inline bool operator<( const sub_range<ForwardRange>& l, |
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162 const sub_range<ForwardRange2>& r ) |
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163 { |
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164 return iterator_range_detail::less_than( l, r ); |
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165 } |
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166 |
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167 |
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168 } // namespace 'boost' |
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169 |
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170 #endif |