[857] | 1 |
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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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