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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_DIFFERENCE_TYPE_HPP |
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12 #define BOOST_RANGE_DIFFERENCE_TYPE_HPP |
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13 |
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14 #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
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15 # pragma once |
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16 #endif |
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17 |
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18 #include <boost/range/config.hpp> |
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19 #include <boost/range/const_iterator.hpp> |
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20 #include <boost/iterator/iterator_traits.hpp> |
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21 |
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22 namespace boost |
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23 { |
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24 template< class T > |
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25 struct range_difference |
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26 { |
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27 typedef BOOST_DEDUCED_TYPENAME iterator_difference< |
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28 BOOST_DEDUCED_TYPENAME range_const_iterator<T>::type >::type |
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29 type; |
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30 }; |
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31 } |
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32 |
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33 //#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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34 //#include <boost/range/detail/difference_type.hpp> |
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35 //#else |
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36 |
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37 /* |
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38 #include <cstddef> |
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39 #include <utility> |
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40 |
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41 namespace boost |
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42 { |
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43 ////////////////////////////////////////////////////////////////////////// |
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44 // default |
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45 ////////////////////////////////////////////////////////////////////////// |
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46 |
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47 template< typename C > |
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48 struct range_difference |
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49 { |
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50 typedef BOOST_DEDUCED_TYPENAME C::difference_type type; |
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51 }; |
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52 |
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53 ////////////////////////////////////////////////////////////////////////// |
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54 // pair |
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55 ////////////////////////////////////////////////////////////////////////// |
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56 |
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57 template< typename Iterator > |
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58 struct range_difference< std::pair<Iterator,Iterator> > |
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59 { |
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60 typedef BOOST_DEDUCED_TYPENAME |
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61 iterator_difference<Iterator>::type type; |
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62 }; |
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63 |
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64 template< typename Iterator > |
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65 struct range_difference< const std::pair<Iterator,Iterator> > |
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66 { |
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67 typedef BOOST_DEDUCED_TYPENAME |
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68 iterator_difference<Iterator>::type type; |
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69 }; |
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70 |
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71 |
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72 ////////////////////////////////////////////////////////////////////////// |
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73 // array |
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74 ////////////////////////////////////////////////////////////////////////// |
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75 |
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76 template< typename T, std::size_t sz > |
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77 struct range_difference< T[sz] > |
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78 { |
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79 typedef std::ptrdiff_t type; |
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80 }; |
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81 |
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82 template< typename T, std::size_t sz > |
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83 struct range_difference< const T[sz] > |
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84 { |
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85 typedef std::ptrdiff_t type; |
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86 }; |
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87 |
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88 ////////////////////////////////////////////////////////////////////////// |
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89 // string |
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90 ////////////////////////////////////////////////////////////////////////// |
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91 |
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92 template<> |
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93 struct range_difference< char* > |
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94 { |
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95 typedef std::ptrdiff_t type; |
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96 }; |
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97 |
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98 template<> |
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99 struct range_difference< wchar_t* > |
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100 { |
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101 typedef std::ptrdiff_t type; |
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102 }; |
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103 |
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104 template<> |
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105 struct range_difference< const char* > |
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106 { |
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107 typedef std::ptrdiff_t type; |
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108 }; |
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109 |
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110 template<> |
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111 struct range_difference< const wchar_t* > |
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112 { |
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113 typedef std::ptrdiff_t type; |
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114 }; |
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115 |
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116 template<> |
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117 struct range_difference< char* const > |
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118 { |
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119 typedef std::ptrdiff_t type; |
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120 }; |
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121 |
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122 template<> |
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123 struct range_difference< wchar_t* const > |
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124 { |
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125 typedef std::ptrdiff_t type; |
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126 }; |
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127 |
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128 template<> |
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129 struct range_difference< const char* const > |
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130 { |
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131 typedef std::ptrdiff_t type; |
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132 }; |
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133 |
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134 template<> |
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135 struct range_difference< const wchar_t* const > |
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136 { |
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137 typedef std::ptrdiff_t type; |
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138 }; |
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139 |
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140 } // namespace boost |
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141 |
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142 #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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143 */ |
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144 |
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145 #endif |