1 | // ------------------------------------------------------------------------------ |
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2 | // Boost functional.hpp header file |
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3 | // See http://www.boost.org/libs/functional for documentation. |
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4 | // ------------------------------------------------------------------------------ |
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5 | // Copyright (c) 2000 |
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6 | // Cadenza New Zealand Ltd |
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7 | // |
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8 | // Permission to use, copy, modify, distribute and sell this software |
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9 | // and its documentation for any purpose is hereby granted without |
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10 | // fee, provided that the above copyright notice appears in all copies |
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11 | // and that both the copyright notice and this permission notice |
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12 | // appear in supporting documentation. Cadenza New Zealand Ltd makes |
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13 | // no representations about the suitability of this software for any |
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14 | // purpose. It is provided "as is" without express or implied |
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15 | // warranty. |
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16 | // ------------------------------------------------------------------------------ |
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17 | // $Id: functional.hpp,v 1.4 2002/12/27 16:51:52 beman_dawes Exp $ |
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18 | // ------------------------------------------------------------------------------ |
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19 | |
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20 | #ifndef BOOST_FUNCTIONAL_HPP |
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21 | #define BOOST_FUNCTIONAL_HPP |
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22 | |
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23 | #include <boost/config.hpp> |
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24 | #include <boost/call_traits.hpp> |
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25 | #include <functional> |
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26 | |
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27 | namespace boost |
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28 | { |
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29 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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30 | // -------------------------------------------------------------------------- |
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31 | // The following traits classes allow us to avoid the need for ptr_fun |
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32 | // because the types of arguments and the result of a function can be |
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33 | // deduced. |
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34 | // |
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35 | // In addition to the standard types defined in unary_function and |
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36 | // binary_function, we add |
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37 | // |
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38 | // - function_type, the type of the function or function object itself. |
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39 | // |
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40 | // - param_type, the type that should be used for passing the function or |
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41 | // function object as an argument. |
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42 | // -------------------------------------------------------------------------- |
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43 | namespace detail |
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44 | { |
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45 | template <class Operation> |
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46 | struct unary_traits_imp; |
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47 | |
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48 | template <class Operation> |
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49 | struct unary_traits_imp<Operation*> |
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50 | { |
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51 | typedef Operation function_type; |
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52 | typedef const function_type & param_type; |
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53 | typedef typename Operation::result_type result_type; |
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54 | typedef typename Operation::argument_type argument_type; |
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55 | }; |
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56 | |
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57 | template <class R, class A> |
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58 | struct unary_traits_imp<R(*)(A)> |
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59 | { |
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60 | typedef R (*function_type)(A); |
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61 | typedef R (*param_type)(A); |
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62 | typedef R result_type; |
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63 | typedef A argument_type; |
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64 | }; |
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65 | |
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66 | template <class Operation> |
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67 | struct binary_traits_imp; |
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68 | |
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69 | template <class Operation> |
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70 | struct binary_traits_imp<Operation*> |
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71 | { |
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72 | typedef Operation function_type; |
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73 | typedef const function_type & param_type; |
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74 | typedef typename Operation::result_type result_type; |
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75 | typedef typename Operation::first_argument_type first_argument_type; |
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76 | typedef typename Operation::second_argument_type second_argument_type; |
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77 | }; |
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78 | |
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79 | template <class R, class A1, class A2> |
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80 | struct binary_traits_imp<R(*)(A1,A2)> |
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81 | { |
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82 | typedef R (*function_type)(A1,A2); |
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83 | typedef R (*param_type)(A1,A2); |
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84 | typedef R result_type; |
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85 | typedef A1 first_argument_type; |
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86 | typedef A2 second_argument_type; |
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87 | }; |
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88 | } // namespace detail |
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89 | |
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90 | template <class Operation> |
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91 | struct unary_traits |
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92 | { |
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93 | typedef typename detail::unary_traits_imp<Operation*>::function_type function_type; |
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94 | typedef typename detail::unary_traits_imp<Operation*>::param_type param_type; |
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95 | typedef typename detail::unary_traits_imp<Operation*>::result_type result_type; |
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96 | typedef typename detail::unary_traits_imp<Operation*>::argument_type argument_type; |
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97 | }; |
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98 | |
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99 | template <class R, class A> |
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100 | struct unary_traits<R(*)(A)> |
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101 | { |
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102 | typedef R (*function_type)(A); |
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103 | typedef R (*param_type)(A); |
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104 | typedef R result_type; |
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105 | typedef A argument_type; |
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106 | }; |
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107 | |
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108 | template <class Operation> |
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109 | struct binary_traits |
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110 | { |
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111 | typedef typename detail::binary_traits_imp<Operation*>::function_type function_type; |
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112 | typedef typename detail::binary_traits_imp<Operation*>::param_type param_type; |
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113 | typedef typename detail::binary_traits_imp<Operation*>::result_type result_type; |
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114 | typedef typename detail::binary_traits_imp<Operation*>::first_argument_type first_argument_type; |
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115 | typedef typename detail::binary_traits_imp<Operation*>::second_argument_type second_argument_type; |
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116 | }; |
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117 | |
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118 | template <class R, class A1, class A2> |
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119 | struct binary_traits<R(*)(A1,A2)> |
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120 | { |
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121 | typedef R (*function_type)(A1,A2); |
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122 | typedef R (*param_type)(A1,A2); |
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123 | typedef R result_type; |
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124 | typedef A1 first_argument_type; |
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125 | typedef A2 second_argument_type; |
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126 | }; |
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127 | #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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128 | // -------------------------------------------------------------------------- |
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129 | // If we have no partial specialisation available, decay to a situation |
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130 | // that is no worse than in the Standard, i.e., ptr_fun will be required. |
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131 | // -------------------------------------------------------------------------- |
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132 | |
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133 | template <class Operation> |
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134 | struct unary_traits |
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135 | { |
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136 | typedef Operation function_type; |
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137 | typedef const Operation& param_type; |
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138 | typedef typename Operation::result_type result_type; |
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139 | typedef typename Operation::argument_type argument_type; |
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140 | }; |
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141 | |
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142 | template <class Operation> |
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143 | struct binary_traits |
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144 | { |
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145 | typedef Operation function_type; |
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146 | typedef const Operation & param_type; |
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147 | typedef typename Operation::result_type result_type; |
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148 | typedef typename Operation::first_argument_type first_argument_type; |
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149 | typedef typename Operation::second_argument_type second_argument_type; |
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150 | }; |
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151 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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152 | |
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153 | // -------------------------------------------------------------------------- |
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154 | // unary_negate, not1 |
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155 | // -------------------------------------------------------------------------- |
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156 | template <class Predicate> |
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157 | class unary_negate |
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158 | : public std::unary_function<typename unary_traits<Predicate>::argument_type,bool> |
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159 | { |
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160 | public: |
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161 | explicit unary_negate(typename unary_traits<Predicate>::param_type x) |
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162 | : |
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163 | pred(x) |
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164 | {} |
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165 | bool operator()(typename call_traits<typename unary_traits<Predicate>::argument_type>::param_type x) const |
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166 | { |
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167 | return !pred(x); |
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168 | } |
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169 | private: |
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170 | typename unary_traits<Predicate>::function_type pred; |
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171 | }; |
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172 | |
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173 | template <class Predicate> |
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174 | unary_negate<Predicate> not1(const Predicate &pred) |
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175 | { |
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176 | // The cast is to placate Borland C++Builder in certain circumstances. |
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177 | // I don't think it should be necessary. |
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178 | return unary_negate<Predicate>((typename unary_traits<Predicate>::param_type)pred); |
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179 | } |
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180 | |
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181 | template <class Predicate> |
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182 | unary_negate<Predicate> not1(Predicate &pred) |
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183 | { |
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184 | return unary_negate<Predicate>(pred); |
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185 | } |
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186 | |
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187 | // -------------------------------------------------------------------------- |
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188 | // binary_negate, not2 |
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189 | // -------------------------------------------------------------------------- |
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190 | template <class Predicate> |
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191 | class binary_negate |
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192 | : public std::binary_function<typename binary_traits<Predicate>::first_argument_type, |
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193 | typename binary_traits<Predicate>::second_argument_type, |
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194 | bool> |
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195 | { |
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196 | public: |
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197 | explicit binary_negate(typename binary_traits<Predicate>::param_type x) |
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198 | : |
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199 | pred(x) |
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200 | {} |
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201 | bool operator()(typename call_traits<typename binary_traits<Predicate>::first_argument_type>::param_type x, |
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202 | typename call_traits<typename binary_traits<Predicate>::second_argument_type>::param_type y) const |
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203 | { |
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204 | return !pred(x,y); |
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205 | } |
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206 | private: |
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207 | typename binary_traits<Predicate>::function_type pred; |
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208 | }; |
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209 | |
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210 | template <class Predicate> |
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211 | binary_negate<Predicate> not2(const Predicate &pred) |
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212 | { |
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213 | // The cast is to placate Borland C++Builder in certain circumstances. |
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214 | // I don't think it should be necessary. |
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215 | return binary_negate<Predicate>((typename binary_traits<Predicate>::param_type)pred); |
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216 | } |
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217 | |
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218 | template <class Predicate> |
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219 | binary_negate<Predicate> not2(Predicate &pred) |
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220 | { |
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221 | return binary_negate<Predicate>(pred); |
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222 | } |
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223 | |
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224 | // -------------------------------------------------------------------------- |
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225 | // binder1st, bind1st |
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226 | // -------------------------------------------------------------------------- |
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227 | template <class Operation> |
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228 | class binder1st |
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229 | : public std::unary_function<typename binary_traits<Operation>::second_argument_type, |
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230 | typename binary_traits<Operation>::result_type> |
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231 | { |
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232 | public: |
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233 | binder1st(typename binary_traits<Operation>::param_type x, |
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234 | typename call_traits<typename binary_traits<Operation>::first_argument_type>::param_type y) |
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235 | : |
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236 | op(x), value(y) |
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237 | {} |
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238 | |
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239 | typename binary_traits<Operation>::result_type |
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240 | operator()(typename call_traits<typename binary_traits<Operation>::second_argument_type>::param_type x) const |
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241 | { |
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242 | return op(value, x); |
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243 | } |
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244 | |
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245 | protected: |
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246 | typename binary_traits<Operation>::function_type op; |
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247 | typename binary_traits<Operation>::first_argument_type value; |
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248 | }; |
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249 | |
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250 | template <class Operation> |
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251 | inline binder1st<Operation> bind1st(const Operation &op, |
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252 | typename call_traits< |
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253 | typename binary_traits<Operation>::first_argument_type |
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254 | >::param_type x) |
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255 | { |
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256 | // The cast is to placate Borland C++Builder in certain circumstances. |
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257 | // I don't think it should be necessary. |
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258 | return binder1st<Operation>((typename binary_traits<Operation>::param_type)op, x); |
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259 | } |
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260 | |
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261 | template <class Operation> |
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262 | inline binder1st<Operation> bind1st(Operation &op, |
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263 | typename call_traits< |
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264 | typename binary_traits<Operation>::first_argument_type |
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265 | >::param_type x) |
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266 | { |
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267 | return binder1st<Operation>(op, x); |
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268 | } |
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269 | |
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270 | // -------------------------------------------------------------------------- |
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271 | // binder2nd, bind2nd |
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272 | // -------------------------------------------------------------------------- |
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273 | template <class Operation> |
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274 | class binder2nd |
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275 | : public std::unary_function<typename binary_traits<Operation>::first_argument_type, |
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276 | typename binary_traits<Operation>::result_type> |
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277 | { |
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278 | public: |
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279 | binder2nd(typename binary_traits<Operation>::param_type x, |
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280 | typename call_traits<typename binary_traits<Operation>::second_argument_type>::param_type y) |
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281 | : |
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282 | op(x), value(y) |
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283 | {} |
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284 | |
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285 | typename binary_traits<Operation>::result_type |
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286 | operator()(typename call_traits<typename binary_traits<Operation>::first_argument_type>::param_type x) const |
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287 | { |
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288 | return op(x, value); |
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289 | } |
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290 | |
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291 | protected: |
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292 | typename binary_traits<Operation>::function_type op; |
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293 | typename binary_traits<Operation>::second_argument_type value; |
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294 | }; |
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295 | |
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296 | template <class Operation> |
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297 | inline binder2nd<Operation> bind2nd(const Operation &op, |
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298 | typename call_traits< |
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299 | typename binary_traits<Operation>::second_argument_type |
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300 | >::param_type x) |
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301 | { |
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302 | // The cast is to placate Borland C++Builder in certain circumstances. |
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303 | // I don't think it should be necessary. |
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304 | return binder2nd<Operation>((typename binary_traits<Operation>::param_type)op, x); |
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305 | } |
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306 | |
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307 | template <class Operation> |
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308 | inline binder2nd<Operation> bind2nd(Operation &op, |
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309 | typename call_traits< |
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310 | typename binary_traits<Operation>::second_argument_type |
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311 | >::param_type x) |
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312 | { |
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313 | return binder2nd<Operation>(op, x); |
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314 | } |
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315 | |
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316 | // -------------------------------------------------------------------------- |
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317 | // mem_fun, etc |
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318 | // -------------------------------------------------------------------------- |
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319 | template <class S, class T> |
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320 | class mem_fun_t : public std::unary_function<T*, S> |
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321 | { |
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322 | public: |
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323 | explicit mem_fun_t(S (T::*p)()) |
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324 | : |
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325 | ptr(p) |
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326 | {} |
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327 | S operator()(T* p) const |
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328 | { |
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329 | return (p->*ptr)(); |
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330 | } |
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331 | private: |
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332 | S (T::*ptr)(); |
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333 | }; |
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334 | |
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335 | template <class S, class T, class A> |
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336 | class mem_fun1_t : public std::binary_function<T*, A, S> |
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337 | { |
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338 | public: |
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339 | explicit mem_fun1_t(S (T::*p)(A)) |
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340 | : |
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341 | ptr(p) |
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342 | {} |
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343 | S operator()(T* p, typename call_traits<A>::param_type x) const |
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344 | { |
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345 | return (p->*ptr)(x); |
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346 | } |
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347 | private: |
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348 | S (T::*ptr)(A); |
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349 | }; |
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350 | |
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351 | template <class S, class T> |
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352 | class const_mem_fun_t : public std::unary_function<const T*, S> |
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353 | { |
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354 | public: |
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355 | explicit const_mem_fun_t(S (T::*p)() const) |
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356 | : |
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357 | ptr(p) |
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358 | {} |
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359 | S operator()(const T* p) const |
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360 | { |
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361 | return (p->*ptr)(); |
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362 | } |
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363 | private: |
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364 | S (T::*ptr)() const; |
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365 | }; |
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366 | |
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367 | template <class S, class T, class A> |
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368 | class const_mem_fun1_t : public std::binary_function<const T*, A, S> |
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369 | { |
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370 | public: |
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371 | explicit const_mem_fun1_t(S (T::*p)(A) const) |
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372 | : |
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373 | ptr(p) |
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374 | {} |
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375 | S operator()(const T* p, typename call_traits<A>::param_type x) const |
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376 | { |
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377 | return (p->*ptr)(x); |
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378 | } |
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379 | private: |
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380 | S (T::*ptr)(A) const; |
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381 | }; |
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382 | |
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383 | template<class S, class T> |
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384 | inline mem_fun_t<S,T> mem_fun(S (T::*f)()) |
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385 | { |
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386 | return mem_fun_t<S,T>(f); |
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387 | } |
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388 | |
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389 | template<class S, class T, class A> |
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390 | inline mem_fun1_t<S,T,A> mem_fun(S (T::*f)(A)) |
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391 | { |
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392 | return mem_fun1_t<S,T,A>(f); |
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393 | } |
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394 | |
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395 | #ifndef BOOST_NO_POINTER_TO_MEMBER_CONST |
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396 | template<class S, class T> |
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397 | inline const_mem_fun_t<S,T> mem_fun(S (T::*f)() const) |
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398 | { |
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399 | return const_mem_fun_t<S,T>(f); |
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400 | } |
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401 | |
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402 | template<class S, class T, class A> |
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403 | inline const_mem_fun1_t<S,T,A> mem_fun(S (T::*f)(A) const) |
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404 | { |
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405 | return const_mem_fun1_t<S,T,A>(f); |
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406 | } |
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407 | #endif // BOOST_NO_POINTER_TO_MEMBER_CONST |
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408 | |
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409 | // -------------------------------------------------------------------------- |
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410 | // mem_fun_ref, etc |
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411 | // -------------------------------------------------------------------------- |
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412 | template <class S, class T> |
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413 | class mem_fun_ref_t : public std::unary_function<T&, S> |
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414 | { |
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415 | public: |
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416 | explicit mem_fun_ref_t(S (T::*p)()) |
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417 | : |
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418 | ptr(p) |
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419 | {} |
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420 | S operator()(T& p) const |
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421 | { |
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422 | return (p.*ptr)(); |
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423 | } |
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424 | private: |
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425 | S (T::*ptr)(); |
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426 | }; |
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427 | |
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428 | template <class S, class T, class A> |
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429 | class mem_fun1_ref_t : public std::binary_function<T&, A, S> |
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430 | { |
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431 | public: |
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432 | explicit mem_fun1_ref_t(S (T::*p)(A)) |
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433 | : |
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434 | ptr(p) |
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435 | {} |
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436 | S operator()(T& p, typename call_traits<A>::param_type x) const |
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437 | { |
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438 | return (p.*ptr)(x); |
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439 | } |
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440 | private: |
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441 | S (T::*ptr)(A); |
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442 | }; |
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443 | |
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444 | template <class S, class T> |
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445 | class const_mem_fun_ref_t : public std::unary_function<const T&, S> |
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446 | { |
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447 | public: |
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448 | explicit const_mem_fun_ref_t(S (T::*p)() const) |
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449 | : |
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450 | ptr(p) |
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451 | {} |
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452 | |
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453 | S operator()(const T &p) const |
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454 | { |
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455 | return (p.*ptr)(); |
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456 | } |
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457 | private: |
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458 | S (T::*ptr)() const; |
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459 | }; |
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460 | |
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461 | template <class S, class T, class A> |
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462 | class const_mem_fun1_ref_t : public std::binary_function<const T&, A, S> |
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463 | { |
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464 | public: |
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465 | explicit const_mem_fun1_ref_t(S (T::*p)(A) const) |
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466 | : |
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467 | ptr(p) |
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468 | {} |
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469 | |
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470 | S operator()(const T& p, typename call_traits<A>::param_type x) const |
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471 | { |
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472 | return (p.*ptr)(x); |
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473 | } |
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474 | private: |
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475 | S (T::*ptr)(A) const; |
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476 | }; |
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477 | |
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478 | template<class S, class T> |
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479 | inline mem_fun_ref_t<S,T> mem_fun_ref(S (T::*f)()) |
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480 | { |
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481 | return mem_fun_ref_t<S,T>(f); |
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482 | } |
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483 | |
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484 | template<class S, class T, class A> |
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485 | inline mem_fun1_ref_t<S,T,A> mem_fun_ref(S (T::*f)(A)) |
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486 | { |
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487 | return mem_fun1_ref_t<S,T,A>(f); |
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488 | } |
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489 | |
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490 | #ifndef BOOST_NO_POINTER_TO_MEMBER_CONST |
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491 | template<class S, class T> |
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492 | inline const_mem_fun_ref_t<S,T> mem_fun_ref(S (T::*f)() const) |
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493 | { |
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494 | return const_mem_fun_ref_t<S,T>(f); |
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495 | } |
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496 | |
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497 | template<class S, class T, class A> |
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498 | inline const_mem_fun1_ref_t<S,T,A> mem_fun_ref(S (T::*f)(A) const) |
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499 | { |
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500 | return const_mem_fun1_ref_t<S,T,A>(f); |
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501 | } |
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502 | #endif // BOOST_NO_POINTER_TO_MEMBER_CONST |
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503 | |
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504 | // -------------------------------------------------------------------------- |
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505 | // ptr_fun |
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506 | // -------------------------------------------------------------------------- |
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507 | template <class Arg, class Result> |
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508 | class pointer_to_unary_function : public std::unary_function<Arg,Result> |
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509 | { |
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510 | public: |
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511 | explicit pointer_to_unary_function(Result (*f)(Arg)) |
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512 | : |
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513 | func(f) |
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514 | {} |
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515 | |
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516 | Result operator()(typename call_traits<Arg>::param_type x) const |
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517 | { |
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518 | return func(x); |
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519 | } |
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520 | |
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521 | private: |
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522 | Result (*func)(Arg); |
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523 | }; |
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524 | |
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525 | template <class Arg, class Result> |
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526 | inline pointer_to_unary_function<Arg,Result> ptr_fun(Result (*f)(Arg)) |
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527 | { |
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528 | return pointer_to_unary_function<Arg,Result>(f); |
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529 | } |
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530 | |
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531 | template <class Arg1, class Arg2, class Result> |
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532 | class pointer_to_binary_function : public std::binary_function<Arg1,Arg2,Result> |
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533 | { |
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534 | public: |
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535 | explicit pointer_to_binary_function(Result (*f)(Arg1, Arg2)) |
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536 | : |
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537 | func(f) |
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538 | {} |
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539 | |
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540 | Result operator()(typename call_traits<Arg1>::param_type x, typename call_traits<Arg2>::param_type y) const |
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541 | { |
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542 | return func(x,y); |
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543 | } |
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544 | |
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545 | private: |
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546 | Result (*func)(Arg1, Arg2); |
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547 | }; |
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548 | |
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549 | template <class Arg1, class Arg2, class Result> |
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550 | inline pointer_to_binary_function<Arg1,Arg2,Result> ptr_fun(Result (*f)(Arg1, Arg2)) |
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551 | { |
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552 | return pointer_to_binary_function<Arg1,Arg2,Result>(f); |
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553 | } |
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554 | } // namespace boost |
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555 | |
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556 | #endif |
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