Jeff Thompson | a28eed8 | 2013-08-22 16:21:10 -0700 | [diff] [blame] | 1 | |
| 2 | // Copyright 2000 John Maddock (john@johnmaddock.co.uk) |
| 3 | // Use, modification and distribution are subject to the Boost Software License, |
| 4 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| 5 | // http://www.boost.org/LICENSE_1_0.txt). |
| 6 | // |
| 7 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
| 8 | |
| 9 | #ifndef BOOST_TT_FUNCTION_TRAITS_HPP_INCLUDED |
| 10 | #define BOOST_TT_FUNCTION_TRAITS_HPP_INCLUDED |
| 11 | |
| 12 | #include <ndnboost/config.hpp> |
| 13 | #include <ndnboost/type_traits/is_function.hpp> |
| 14 | #include <ndnboost/type_traits/add_pointer.hpp> |
| 15 | |
| 16 | namespace ndnboost { |
| 17 | |
| 18 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
| 19 | namespace detail { |
| 20 | |
| 21 | template<typename Function> struct function_traits_helper; |
| 22 | |
| 23 | template<typename R> |
| 24 | struct function_traits_helper<R (*)(void)> |
| 25 | { |
| 26 | BOOST_STATIC_CONSTANT(unsigned, arity = 0); |
| 27 | typedef R result_type; |
| 28 | }; |
| 29 | |
| 30 | template<typename R, typename T1> |
| 31 | struct function_traits_helper<R (*)(T1)> |
| 32 | { |
| 33 | BOOST_STATIC_CONSTANT(unsigned, arity = 1); |
| 34 | typedef R result_type; |
| 35 | typedef T1 arg1_type; |
| 36 | typedef T1 argument_type; |
| 37 | }; |
| 38 | |
| 39 | template<typename R, typename T1, typename T2> |
| 40 | struct function_traits_helper<R (*)(T1, T2)> |
| 41 | { |
| 42 | BOOST_STATIC_CONSTANT(unsigned, arity = 2); |
| 43 | typedef R result_type; |
| 44 | typedef T1 arg1_type; |
| 45 | typedef T2 arg2_type; |
| 46 | typedef T1 first_argument_type; |
| 47 | typedef T2 second_argument_type; |
| 48 | }; |
| 49 | |
| 50 | template<typename R, typename T1, typename T2, typename T3> |
| 51 | struct function_traits_helper<R (*)(T1, T2, T3)> |
| 52 | { |
| 53 | BOOST_STATIC_CONSTANT(unsigned, arity = 3); |
| 54 | typedef R result_type; |
| 55 | typedef T1 arg1_type; |
| 56 | typedef T2 arg2_type; |
| 57 | typedef T3 arg3_type; |
| 58 | }; |
| 59 | |
| 60 | template<typename R, typename T1, typename T2, typename T3, typename T4> |
| 61 | struct function_traits_helper<R (*)(T1, T2, T3, T4)> |
| 62 | { |
| 63 | BOOST_STATIC_CONSTANT(unsigned, arity = 4); |
| 64 | typedef R result_type; |
| 65 | typedef T1 arg1_type; |
| 66 | typedef T2 arg2_type; |
| 67 | typedef T3 arg3_type; |
| 68 | typedef T4 arg4_type; |
| 69 | }; |
| 70 | |
| 71 | template<typename R, typename T1, typename T2, typename T3, typename T4, |
| 72 | typename T5> |
| 73 | struct function_traits_helper<R (*)(T1, T2, T3, T4, T5)> |
| 74 | { |
| 75 | BOOST_STATIC_CONSTANT(unsigned, arity = 5); |
| 76 | typedef R result_type; |
| 77 | typedef T1 arg1_type; |
| 78 | typedef T2 arg2_type; |
| 79 | typedef T3 arg3_type; |
| 80 | typedef T4 arg4_type; |
| 81 | typedef T5 arg5_type; |
| 82 | }; |
| 83 | |
| 84 | template<typename R, typename T1, typename T2, typename T3, typename T4, |
| 85 | typename T5, typename T6> |
| 86 | struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6)> |
| 87 | { |
| 88 | BOOST_STATIC_CONSTANT(unsigned, arity = 6); |
| 89 | typedef R result_type; |
| 90 | typedef T1 arg1_type; |
| 91 | typedef T2 arg2_type; |
| 92 | typedef T3 arg3_type; |
| 93 | typedef T4 arg4_type; |
| 94 | typedef T5 arg5_type; |
| 95 | typedef T6 arg6_type; |
| 96 | }; |
| 97 | |
| 98 | template<typename R, typename T1, typename T2, typename T3, typename T4, |
| 99 | typename T5, typename T6, typename T7> |
| 100 | struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6, T7)> |
| 101 | { |
| 102 | BOOST_STATIC_CONSTANT(unsigned, arity = 7); |
| 103 | typedef R result_type; |
| 104 | typedef T1 arg1_type; |
| 105 | typedef T2 arg2_type; |
| 106 | typedef T3 arg3_type; |
| 107 | typedef T4 arg4_type; |
| 108 | typedef T5 arg5_type; |
| 109 | typedef T6 arg6_type; |
| 110 | typedef T7 arg7_type; |
| 111 | }; |
| 112 | |
| 113 | template<typename R, typename T1, typename T2, typename T3, typename T4, |
| 114 | typename T5, typename T6, typename T7, typename T8> |
| 115 | struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6, T7, T8)> |
| 116 | { |
| 117 | BOOST_STATIC_CONSTANT(unsigned, arity = 8); |
| 118 | typedef R result_type; |
| 119 | typedef T1 arg1_type; |
| 120 | typedef T2 arg2_type; |
| 121 | typedef T3 arg3_type; |
| 122 | typedef T4 arg4_type; |
| 123 | typedef T5 arg5_type; |
| 124 | typedef T6 arg6_type; |
| 125 | typedef T7 arg7_type; |
| 126 | typedef T8 arg8_type; |
| 127 | }; |
| 128 | |
| 129 | template<typename R, typename T1, typename T2, typename T3, typename T4, |
| 130 | typename T5, typename T6, typename T7, typename T8, typename T9> |
| 131 | struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6, T7, T8, T9)> |
| 132 | { |
| 133 | BOOST_STATIC_CONSTANT(unsigned, arity = 9); |
| 134 | typedef R result_type; |
| 135 | typedef T1 arg1_type; |
| 136 | typedef T2 arg2_type; |
| 137 | typedef T3 arg3_type; |
| 138 | typedef T4 arg4_type; |
| 139 | typedef T5 arg5_type; |
| 140 | typedef T6 arg6_type; |
| 141 | typedef T7 arg7_type; |
| 142 | typedef T8 arg8_type; |
| 143 | typedef T9 arg9_type; |
| 144 | }; |
| 145 | |
| 146 | template<typename R, typename T1, typename T2, typename T3, typename T4, |
| 147 | typename T5, typename T6, typename T7, typename T8, typename T9, |
| 148 | typename T10> |
| 149 | struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)> |
| 150 | { |
| 151 | BOOST_STATIC_CONSTANT(unsigned, arity = 10); |
| 152 | typedef R result_type; |
| 153 | typedef T1 arg1_type; |
| 154 | typedef T2 arg2_type; |
| 155 | typedef T3 arg3_type; |
| 156 | typedef T4 arg4_type; |
| 157 | typedef T5 arg5_type; |
| 158 | typedef T6 arg6_type; |
| 159 | typedef T7 arg7_type; |
| 160 | typedef T8 arg8_type; |
| 161 | typedef T9 arg9_type; |
| 162 | typedef T10 arg10_type; |
| 163 | }; |
| 164 | |
| 165 | } // end namespace detail |
| 166 | |
| 167 | template<typename Function> |
| 168 | struct function_traits : |
| 169 | public ndnboost::detail::function_traits_helper<typename ndnboost::add_pointer<Function>::type> |
| 170 | { |
| 171 | }; |
| 172 | |
| 173 | #else |
| 174 | |
| 175 | namespace detail { |
| 176 | |
| 177 | template<unsigned N> |
| 178 | struct type_of_size |
| 179 | { |
| 180 | char elements[N]; |
| 181 | }; |
| 182 | |
| 183 | template<typename R> |
| 184 | type_of_size<1> function_arity_helper(R (*f)()); |
| 185 | |
| 186 | template<typename R, typename T1> |
| 187 | type_of_size<2> function_arity_helper(R (*f)(T1)); |
| 188 | |
| 189 | template<typename R, typename T1, typename T2> |
| 190 | type_of_size<3> function_arity_helper(R (*f)(T1, T2)); |
| 191 | |
| 192 | template<typename R, typename T1, typename T2, typename T3> |
| 193 | type_of_size<4> function_arity_helper(R (*f)(T1, T2, T3)); |
| 194 | |
| 195 | template<typename R, typename T1, typename T2, typename T3, typename T4> |
| 196 | type_of_size<5> function_arity_helper(R (*f)(T1, T2, T3, T4)); |
| 197 | |
| 198 | template<typename R, typename T1, typename T2, typename T3, typename T4, |
| 199 | typename T5> |
| 200 | type_of_size<6> function_arity_helper(R (*f)(T1, T2, T3, T4, T5)); |
| 201 | |
| 202 | template<typename R, typename T1, typename T2, typename T3, typename T4, |
| 203 | typename T5, typename T6> |
| 204 | type_of_size<7> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6)); |
| 205 | |
| 206 | template<typename R, typename T1, typename T2, typename T3, typename T4, |
| 207 | typename T5, typename T6, typename T7> |
| 208 | type_of_size<8> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6, T7)); |
| 209 | |
| 210 | template<typename R, typename T1, typename T2, typename T3, typename T4, |
| 211 | typename T5, typename T6, typename T7, typename T8> |
| 212 | type_of_size<9> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6, T7, T8)); |
| 213 | |
| 214 | template<typename R, typename T1, typename T2, typename T3, typename T4, |
| 215 | typename T5, typename T6, typename T7, typename T8, typename T9> |
| 216 | type_of_size<10> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6, T7, T8, |
| 217 | T9)); |
| 218 | |
| 219 | template<typename R, typename T1, typename T2, typename T3, typename T4, |
| 220 | typename T5, typename T6, typename T7, typename T8, typename T9, |
| 221 | typename T10> |
| 222 | type_of_size<11> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6, T7, T8, |
| 223 | T9, T10)); |
| 224 | } // end namespace detail |
| 225 | |
| 226 | // Won't work with references |
| 227 | template<typename Function> |
| 228 | struct function_traits |
| 229 | { |
| 230 | BOOST_STATIC_CONSTANT(unsigned, arity = (sizeof(ndnboost::detail::function_arity_helper((Function*)0))-1)); |
| 231 | }; |
| 232 | |
| 233 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
| 234 | } |
| 235 | |
| 236 | #endif // BOOST_TT_FUNCTION_TRAITS_HPP_INCLUDED |