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2 | // Copyright 2000 John Maddock (john@johnmaddock.co.uk)
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3 | // Use, modification and distribution are subject to the Boost Software License,
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4 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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5 | // http://www.boost.org/LICENSE_1_0.txt).
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6 | //
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7 | // See http://www.boost.org/libs/type_traits for most recent version including documentation.
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8 |
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9 | #ifndef BOOST_TT_FUNCTION_TRAITS_HPP_INCLUDED
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10 | #define BOOST_TT_FUNCTION_TRAITS_HPP_INCLUDED
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11 |
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12 | #include <boost/config.hpp>
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13 | #include <boost/type_traits/is_function.hpp>
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14 | #include <boost/type_traits/add_pointer.hpp>
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15 |
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16 | namespace boost {
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17 |
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18 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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19 | namespace detail {
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20 |
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21 | template<typename Function> struct function_traits_helper;
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22 |
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23 | template<typename R>
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24 | struct function_traits_helper<R (*)(void)>
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25 | {
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26 | BOOST_STATIC_CONSTANT(int, arity = 0);
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27 | typedef R result_type;
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28 | };
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29 |
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30 | template<typename R, typename T1>
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31 | struct function_traits_helper<R (*)(T1)>
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32 | {
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33 | BOOST_STATIC_CONSTANT(int, arity = 1);
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34 | typedef R result_type;
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35 | typedef T1 arg1_type;
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36 | typedef T1 argument_type;
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37 | };
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38 |
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39 | template<typename R, typename T1, typename T2>
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40 | struct function_traits_helper<R (*)(T1, T2)>
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41 | {
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42 | BOOST_STATIC_CONSTANT(int, arity = 2);
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43 | typedef R result_type;
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44 | typedef T1 arg1_type;
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45 | typedef T2 arg2_type;
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46 | typedef T1 first_argument_type;
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47 | typedef T2 second_argument_type;
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48 | };
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49 |
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50 | template<typename R, typename T1, typename T2, typename T3>
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51 | struct function_traits_helper<R (*)(T1, T2, T3)>
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52 | {
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53 | BOOST_STATIC_CONSTANT(int, arity = 3);
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54 | typedef R result_type;
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55 | typedef T1 arg1_type;
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56 | typedef T2 arg2_type;
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57 | typedef T3 arg3_type;
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58 | };
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59 |
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60 | template<typename R, typename T1, typename T2, typename T3, typename T4>
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61 | struct function_traits_helper<R (*)(T1, T2, T3, T4)>
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62 | {
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63 | BOOST_STATIC_CONSTANT(int, arity = 4);
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64 | typedef R result_type;
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65 | typedef T1 arg1_type;
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66 | typedef T2 arg2_type;
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67 | typedef T3 arg3_type;
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68 | typedef T4 arg4_type;
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69 | };
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70 |
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71 | template<typename R, typename T1, typename T2, typename T3, typename T4,
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72 | typename T5>
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73 | struct function_traits_helper<R (*)(T1, T2, T3, T4, T5)>
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74 | {
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75 | BOOST_STATIC_CONSTANT(int, arity = 5);
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76 | typedef R result_type;
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77 | typedef T1 arg1_type;
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78 | typedef T2 arg2_type;
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79 | typedef T3 arg3_type;
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80 | typedef T4 arg4_type;
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81 | typedef T5 arg5_type;
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82 | };
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83 |
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84 | template<typename R, typename T1, typename T2, typename T3, typename T4,
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85 | typename T5, typename T6>
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86 | struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6)>
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87 | {
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88 | BOOST_STATIC_CONSTANT(int, arity = 6);
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89 | typedef R result_type;
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90 | typedef T1 arg1_type;
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91 | typedef T2 arg2_type;
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92 | typedef T3 arg3_type;
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93 | typedef T4 arg4_type;
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94 | typedef T5 arg5_type;
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95 | typedef T6 arg6_type;
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96 | };
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97 |
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98 | template<typename R, typename T1, typename T2, typename T3, typename T4,
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99 | typename T5, typename T6, typename T7>
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100 | struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6, T7)>
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101 | {
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102 | BOOST_STATIC_CONSTANT(int, arity = 7);
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103 | typedef R result_type;
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104 | typedef T1 arg1_type;
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105 | typedef T2 arg2_type;
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106 | typedef T3 arg3_type;
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107 | typedef T4 arg4_type;
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108 | typedef T5 arg5_type;
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109 | typedef T6 arg6_type;
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110 | typedef T7 arg7_type;
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111 | };
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112 |
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113 | template<typename R, typename T1, typename T2, typename T3, typename T4,
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114 | typename T5, typename T6, typename T7, typename T8>
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115 | struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6, T7, T8)>
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116 | {
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117 | BOOST_STATIC_CONSTANT(int, arity = 8);
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118 | typedef R result_type;
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119 | typedef T1 arg1_type;
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120 | typedef T2 arg2_type;
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121 | typedef T3 arg3_type;
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122 | typedef T4 arg4_type;
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123 | typedef T5 arg5_type;
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124 | typedef T6 arg6_type;
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125 | typedef T7 arg7_type;
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126 | typedef T8 arg8_type;
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127 | };
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128 |
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129 | template<typename R, typename T1, typename T2, typename T3, typename T4,
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130 | typename T5, typename T6, typename T7, typename T8, typename T9>
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131 | struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6, T7, T8, T9)>
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132 | {
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133 | BOOST_STATIC_CONSTANT(int, arity = 9);
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134 | typedef R result_type;
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135 | typedef T1 arg1_type;
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136 | typedef T2 arg2_type;
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137 | typedef T3 arg3_type;
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138 | typedef T4 arg4_type;
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139 | typedef T5 arg5_type;
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140 | typedef T6 arg6_type;
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141 | typedef T7 arg7_type;
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142 | typedef T8 arg8_type;
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143 | typedef T9 arg9_type;
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144 | };
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145 |
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146 | template<typename R, typename T1, typename T2, typename T3, typename T4,
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147 | typename T5, typename T6, typename T7, typename T8, typename T9,
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148 | typename T10>
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149 | struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)>
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150 | {
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151 | BOOST_STATIC_CONSTANT(int, arity = 10);
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152 | typedef R result_type;
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153 | typedef T1 arg1_type;
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154 | typedef T2 arg2_type;
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155 | typedef T3 arg3_type;
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156 | typedef T4 arg4_type;
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157 | typedef T5 arg5_type;
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158 | typedef T6 arg6_type;
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159 | typedef T7 arg7_type;
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160 | typedef T8 arg8_type;
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161 | typedef T9 arg9_type;
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162 | typedef T10 arg10_type;
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163 | };
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164 |
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165 | } // end namespace detail
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166 |
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167 | template<typename Function>
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168 | struct function_traits :
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169 | public detail::function_traits_helper<typename add_pointer<Function>::type>
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170 | {
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171 | };
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172 |
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173 | #else
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174 |
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175 | namespace detail {
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176 |
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177 | template<int N>
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178 | struct type_of_size
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179 | {
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180 | char elements[N];
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181 | };
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182 |
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183 | template<typename R>
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184 | type_of_size<1> function_arity_helper(R (*f)());
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185 |
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186 | template<typename R, typename T1>
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187 | type_of_size<2> function_arity_helper(R (*f)(T1));
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188 |
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189 | template<typename R, typename T1, typename T2>
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190 | type_of_size<3> function_arity_helper(R (*f)(T1, T2));
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191 |
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192 | template<typename R, typename T1, typename T2, typename T3>
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193 | type_of_size<4> function_arity_helper(R (*f)(T1, T2, T3));
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194 |
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195 | template<typename R, typename T1, typename T2, typename T3, typename T4>
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196 | type_of_size<5> function_arity_helper(R (*f)(T1, T2, T3, T4));
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197 |
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198 | template<typename R, typename T1, typename T2, typename T3, typename T4,
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199 | typename T5>
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200 | type_of_size<6> function_arity_helper(R (*f)(T1, T2, T3, T4, T5));
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201 |
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202 | template<typename R, typename T1, typename T2, typename T3, typename T4,
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203 | typename T5, typename T6>
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204 | type_of_size<7> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6));
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205 |
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206 | template<typename R, typename T1, typename T2, typename T3, typename T4,
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207 | typename T5, typename T6, typename T7>
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208 | type_of_size<8> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6, T7));
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209 |
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210 | template<typename R, typename T1, typename T2, typename T3, typename T4,
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211 | typename T5, typename T6, typename T7, typename T8>
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212 | type_of_size<9> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6, T7, T8));
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213 |
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214 | template<typename R, typename T1, typename T2, typename T3, typename T4,
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215 | typename T5, typename T6, typename T7, typename T8, typename T9>
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216 | type_of_size<10> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6, T7, T8,
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217 | T9));
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218 |
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219 | template<typename R, typename T1, typename T2, typename T3, typename T4,
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220 | typename T5, typename T6, typename T7, typename T8, typename T9,
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221 | typename T10>
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222 | type_of_size<11> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6, T7, T8,
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223 | T9, T10));
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224 | } // end namespace detail
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225 |
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226 | // Won't work with references
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227 | template<typename Function>
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228 | struct function_traits
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229 | {
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230 | BOOST_STATIC_CONSTANT(int, arity = (sizeof(detail::function_arity_helper((Function*)0))-1));
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231 | };
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232 |
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233 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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234 | }
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235 |
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236 | #endif // BOOST_TT_FUNCTION_TRAITS_HPP_INCLUDED
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