1 | // Boost string_algo library compare.hpp header file -------------------------// |
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2 | |
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3 | // Copyright Pavol Droba 2002-2006. |
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4 | // |
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5 | // Distributed under the Boost Software License, Version 1.0. |
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6 | // (See accompanying file LICENSE_1_0.txt or copy at |
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7 | // http://www.boost.org/LICENSE_1_0.txt) |
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8 | |
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9 | // See http://www.boost.org/ for updates, documentation, and revision history. |
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10 | |
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11 | #ifndef BOOST_STRING_COMPARE_HPP |
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12 | #define BOOST_STRING_COMPARE_HPP |
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13 | |
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14 | #include <boost/algorithm/string/config.hpp> |
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15 | #include <locale> |
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16 | |
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17 | /*! \file |
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18 | Defines element comparison predicates. Many algorithms in this library can |
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19 | take an additional argument with a predicate used to compare elements. |
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20 | This makes it possible, for instance, to have case insensitive versions |
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21 | of the algorithms. |
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22 | */ |
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23 | |
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24 | namespace boost { |
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25 | namespace algorithm { |
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26 | |
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27 | // is_equal functor -----------------------------------------------// |
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28 | |
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29 | //! is_equal functor |
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30 | /*! |
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31 | Standard STL equal_to only handle comparison between arguments |
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32 | of the same type. This is a less restrictive version which wraps operator ==. |
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33 | */ |
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34 | struct is_equal |
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35 | { |
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36 | //! Function operator |
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37 | /*! |
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38 | Compare two operands for equality |
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39 | */ |
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40 | template< typename T1, typename T2 > |
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41 | bool operator()( const T1& Arg1, const T2& Arg2 ) const |
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42 | { |
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43 | return Arg1==Arg2; |
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44 | } |
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45 | }; |
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46 | |
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47 | //! case insensitive version of is_equal |
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48 | /*! |
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49 | Case insensitive comparison predicate. Comparison is done using |
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50 | specified locales. |
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51 | */ |
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52 | struct is_iequal |
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53 | { |
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54 | //! Constructor |
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55 | /*! |
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56 | \param Loc locales used for comparison |
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57 | */ |
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58 | is_iequal( const std::locale& Loc=std::locale() ) : |
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59 | m_Loc( Loc ) {} |
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60 | |
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61 | //! Function operator |
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62 | /*! |
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63 | Compare two operands. Case is ignored. |
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64 | */ |
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65 | template< typename T1, typename T2 > |
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66 | bool operator()( const T1& Arg1, const T2& Arg2 ) const |
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67 | { |
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68 | #if defined(__BORLANDC__) && (__BORLANDC__ >= 0x560) && (__BORLANDC__ <= 0x564) && !defined(_USE_OLD_RW_STL) |
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69 | return std::toupper(Arg1)==std::toupper(Arg2); |
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70 | #else |
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71 | return std::toupper<T1>(Arg1,m_Loc)==std::toupper<T2>(Arg2,m_Loc); |
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72 | #endif |
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73 | } |
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74 | |
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75 | private: |
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76 | std::locale m_Loc; |
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77 | }; |
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78 | |
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79 | // is_less functor -----------------------------------------------// |
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80 | |
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81 | //! is_less functor |
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82 | /*! |
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83 | Convenient version of standard std::less. Operation is templated, therefore it is |
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84 | not required to specify the exact types upon the construction |
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85 | */ |
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86 | struct is_less |
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87 | { |
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88 | //! Functor operation |
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89 | /*! |
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90 | Compare two operands using > operator |
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91 | */ |
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92 | template< typename T1, typename T2 > |
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93 | bool operator()( const T1& Arg1, const T2& Arg2 ) const |
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94 | { |
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95 | return Arg1<Arg2; |
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96 | } |
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97 | }; |
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98 | |
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99 | |
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100 | //! case insensitive version of is_less |
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101 | /*! |
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102 | Case insensitive comparison predicate. Comparison is done using |
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103 | specified locales. |
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104 | */ |
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105 | struct is_iless |
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106 | { |
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107 | //! Constructor |
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108 | /*! |
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109 | \param Loc locales used for comparison |
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110 | */ |
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111 | is_iless( const std::locale& Loc=std::locale() ) : |
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112 | m_Loc( Loc ) {} |
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113 | |
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114 | //! Function operator |
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115 | /*! |
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116 | Compare two operands. Case is ignored. |
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117 | */ |
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118 | template< typename T1, typename T2 > |
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119 | bool operator()( const T1& Arg1, const T2& Arg2 ) const |
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120 | { |
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121 | #if defined(__BORLANDC__) && (__BORLANDC__ >= 0x560) && (__BORLANDC__ <= 0x564) && !defined(_USE_OLD_RW_STL) |
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122 | return std::toupper(Arg1)<std::toupper(Arg2); |
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123 | #else |
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124 | return std::toupper<T1>(Arg1,m_Loc)<std::toupper<T2>(Arg2,m_Loc); |
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125 | #endif |
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126 | } |
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127 | |
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128 | private: |
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129 | std::locale m_Loc; |
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130 | }; |
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131 | |
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132 | // is_not_greater functor -----------------------------------------------// |
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133 | |
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134 | //! is_not_greater functor |
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135 | /*! |
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136 | Convenient version of standard std::not_greater_to. Operation is templated, therefore it is |
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137 | not required to specify the exact types upon the construction |
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138 | */ |
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139 | struct is_not_greater |
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140 | { |
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141 | //! Functor operation |
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142 | /*! |
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143 | Compare two operands using > operator |
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144 | */ |
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145 | template< typename T1, typename T2 > |
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146 | bool operator()( const T1& Arg1, const T2& Arg2 ) const |
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147 | { |
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148 | return Arg1<=Arg2; |
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149 | } |
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150 | }; |
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151 | |
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152 | |
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153 | //! case insensitive version of is_not_greater |
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154 | /*! |
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155 | Case insensitive comparison predicate. Comparison is done using |
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156 | specified locales. |
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157 | */ |
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158 | struct is_not_igreater |
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159 | { |
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160 | //! Constructor |
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161 | /*! |
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162 | \param Loc locales used for comparison |
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163 | */ |
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164 | is_not_igreater( const std::locale& Loc=std::locale() ) : |
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165 | m_Loc( Loc ) {} |
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166 | |
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167 | //! Function operator |
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168 | /*! |
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169 | Compare two operands. Case is ignored. |
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170 | */ |
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171 | template< typename T1, typename T2 > |
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172 | bool operator()( const T1& Arg1, const T2& Arg2 ) const |
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173 | { |
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174 | #if defined(__BORLANDC__) && (__BORLANDC__ >= 0x560) && (__BORLANDC__ <= 0x564) && !defined(_USE_OLD_RW_STL) |
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175 | return std::toupper(Arg1)<=std::toupper(Arg2); |
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176 | #else |
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177 | return std::toupper<T1>(Arg1,m_Loc)<=std::toupper<T2>(Arg2,m_Loc); |
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178 | #endif |
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179 | } |
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180 | |
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181 | private: |
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182 | std::locale m_Loc; |
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183 | }; |
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184 | |
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185 | |
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186 | } // namespace algorithm |
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187 | |
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188 | // pull names to the boost namespace |
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189 | using algorithm::is_equal; |
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190 | using algorithm::is_iequal; |
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191 | using algorithm::is_less; |
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192 | using algorithm::is_iless; |
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193 | using algorithm::is_not_greater; |
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194 | using algorithm::is_not_igreater; |
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195 | |
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196 | } // namespace boost |
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197 | |
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198 | |
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199 | #endif // BOOST_STRING_COMPARE_HPP |
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