| [29] | 1 | // ------------------------------------------------------------------------------ |
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| 2 | // Copyright (c) 2000 Cadenza New Zealand Ltd |
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| 3 | // Distributed under the Boost Software License, Version 1.0. (See accompany- |
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| 4 | // ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 5 | // ------------------------------------------------------------------------------ |
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| 6 | // Boost functional.hpp header file |
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| 7 | // See http://www.boost.org/libs/functional for documentation. |
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| 8 | // ------------------------------------------------------------------------------ |
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| 9 | // $Id: functional.hpp,v 1.4.20.1 2006/12/02 14:17:26 andreas_huber69 Exp $ |
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| 10 | // ------------------------------------------------------------------------------ |
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| 11 | |
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| 12 | #ifndef BOOST_FUNCTIONAL_HPP |
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| 13 | #define BOOST_FUNCTIONAL_HPP |
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| 14 | |
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| 15 | #include <boost/config.hpp> |
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| 16 | #include <boost/call_traits.hpp> |
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| 17 | #include <functional> |
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| 18 | |
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| 19 | namespace boost |
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| 20 | { |
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| 21 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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| 22 | // -------------------------------------------------------------------------- |
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| 23 | // The following traits classes allow us to avoid the need for ptr_fun |
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| 24 | // because the types of arguments and the result of a function can be |
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| 25 | // deduced. |
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| 26 | // |
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| 27 | // In addition to the standard types defined in unary_function and |
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| 28 | // binary_function, we add |
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| 29 | // |
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| 30 | // - function_type, the type of the function or function object itself. |
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| 31 | // |
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| 32 | // - param_type, the type that should be used for passing the function or |
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| 33 | // function object as an argument. |
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| 34 | // -------------------------------------------------------------------------- |
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| 35 | namespace detail |
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| 36 | { |
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| 37 | template <class Operation> |
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| 38 | struct unary_traits_imp; |
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| 39 | |
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| 40 | template <class Operation> |
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| 41 | struct unary_traits_imp<Operation*> |
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| 42 | { |
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| 43 | typedef Operation function_type; |
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| 44 | typedef const function_type & param_type; |
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| 45 | typedef typename Operation::result_type result_type; |
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| 46 | typedef typename Operation::argument_type argument_type; |
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| 47 | }; |
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| 48 | |
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| 49 | template <class R, class A> |
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| 50 | struct unary_traits_imp<R(*)(A)> |
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| 51 | { |
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| 52 | typedef R (*function_type)(A); |
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| 53 | typedef R (*param_type)(A); |
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| 54 | typedef R result_type; |
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| 55 | typedef A argument_type; |
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| 56 | }; |
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| 57 | |
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| 58 | template <class Operation> |
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| 59 | struct binary_traits_imp; |
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| 60 | |
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| 61 | template <class Operation> |
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| 62 | struct binary_traits_imp<Operation*> |
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| 63 | { |
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| 64 | typedef Operation function_type; |
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| 65 | typedef const function_type & param_type; |
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| 66 | typedef typename Operation::result_type result_type; |
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| 67 | typedef typename Operation::first_argument_type first_argument_type; |
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| 68 | typedef typename Operation::second_argument_type second_argument_type; |
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| 69 | }; |
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| 70 | |
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| 71 | template <class R, class A1, class A2> |
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| 72 | struct binary_traits_imp<R(*)(A1,A2)> |
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| 73 | { |
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| 74 | typedef R (*function_type)(A1,A2); |
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| 75 | typedef R (*param_type)(A1,A2); |
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| 76 | typedef R result_type; |
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| 77 | typedef A1 first_argument_type; |
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| 78 | typedef A2 second_argument_type; |
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| 79 | }; |
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| 80 | } // namespace detail |
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| 81 | |
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| 82 | template <class Operation> |
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| 83 | struct unary_traits |
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| 84 | { |
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| 85 | typedef typename detail::unary_traits_imp<Operation*>::function_type function_type; |
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| 86 | typedef typename detail::unary_traits_imp<Operation*>::param_type param_type; |
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| 87 | typedef typename detail::unary_traits_imp<Operation*>::result_type result_type; |
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| 88 | typedef typename detail::unary_traits_imp<Operation*>::argument_type argument_type; |
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| 89 | }; |
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| 90 | |
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| 91 | template <class R, class A> |
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| 92 | struct unary_traits<R(*)(A)> |
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| 93 | { |
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| 94 | typedef R (*function_type)(A); |
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| 95 | typedef R (*param_type)(A); |
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| 96 | typedef R result_type; |
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| 97 | typedef A argument_type; |
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| 98 | }; |
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| 99 | |
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| 100 | template <class Operation> |
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| 101 | struct binary_traits |
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| 102 | { |
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| 103 | typedef typename detail::binary_traits_imp<Operation*>::function_type function_type; |
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| 104 | typedef typename detail::binary_traits_imp<Operation*>::param_type param_type; |
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| 105 | typedef typename detail::binary_traits_imp<Operation*>::result_type result_type; |
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| 106 | typedef typename detail::binary_traits_imp<Operation*>::first_argument_type first_argument_type; |
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| 107 | typedef typename detail::binary_traits_imp<Operation*>::second_argument_type second_argument_type; |
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| 108 | }; |
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| 109 | |
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| 110 | template <class R, class A1, class A2> |
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| 111 | struct binary_traits<R(*)(A1,A2)> |
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| 112 | { |
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| 113 | typedef R (*function_type)(A1,A2); |
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| 114 | typedef R (*param_type)(A1,A2); |
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| 115 | typedef R result_type; |
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| 116 | typedef A1 first_argument_type; |
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| 117 | typedef A2 second_argument_type; |
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| 118 | }; |
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| 119 | #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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| 120 | // -------------------------------------------------------------------------- |
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| 121 | // If we have no partial specialisation available, decay to a situation |
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| 122 | // that is no worse than in the Standard, i.e., ptr_fun will be required. |
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| 123 | // -------------------------------------------------------------------------- |
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| 124 | |
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| 125 | template <class Operation> |
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| 126 | struct unary_traits |
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| 127 | { |
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| 128 | typedef Operation function_type; |
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| 129 | typedef const Operation& param_type; |
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| 130 | typedef typename Operation::result_type result_type; |
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| 131 | typedef typename Operation::argument_type argument_type; |
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| 132 | }; |
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| 133 | |
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| 134 | template <class Operation> |
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| 135 | struct binary_traits |
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| 136 | { |
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| 137 | typedef Operation function_type; |
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| 138 | typedef const Operation & param_type; |
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| 139 | typedef typename Operation::result_type result_type; |
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| 140 | typedef typename Operation::first_argument_type first_argument_type; |
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| 141 | typedef typename Operation::second_argument_type second_argument_type; |
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| 142 | }; |
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| 143 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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| 144 | |
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| 145 | // -------------------------------------------------------------------------- |
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| 146 | // unary_negate, not1 |
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| 147 | // -------------------------------------------------------------------------- |
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| 148 | template <class Predicate> |
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| 149 | class unary_negate |
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| 150 | : public std::unary_function<typename unary_traits<Predicate>::argument_type,bool> |
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| 151 | { |
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| 152 | public: |
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| 153 | explicit unary_negate(typename unary_traits<Predicate>::param_type x) |
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| 154 | : |
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| 155 | pred(x) |
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| 156 | {} |
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| 157 | bool operator()(typename call_traits<typename unary_traits<Predicate>::argument_type>::param_type x) const |
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| 158 | { |
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| 159 | return !pred(x); |
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| 160 | } |
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| 161 | private: |
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| 162 | typename unary_traits<Predicate>::function_type pred; |
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| 163 | }; |
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| 164 | |
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| 165 | template <class Predicate> |
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| 166 | unary_negate<Predicate> not1(const Predicate &pred) |
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| 167 | { |
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| 168 | // The cast is to placate Borland C++Builder in certain circumstances. |
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| 169 | // I don't think it should be necessary. |
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| 170 | return unary_negate<Predicate>((typename unary_traits<Predicate>::param_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(Predicate &pred) |
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| 175 | { |
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| 176 | return unary_negate<Predicate>(pred); |
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| 177 | } |
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| 178 | |
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| 179 | // -------------------------------------------------------------------------- |
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| 180 | // binary_negate, not2 |
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| 181 | // -------------------------------------------------------------------------- |
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| 182 | template <class Predicate> |
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| 183 | class binary_negate |
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| 184 | : public std::binary_function<typename binary_traits<Predicate>::first_argument_type, |
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| 185 | typename binary_traits<Predicate>::second_argument_type, |
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| 186 | bool> |
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| 187 | { |
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| 188 | public: |
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| 189 | explicit binary_negate(typename binary_traits<Predicate>::param_type x) |
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| 190 | : |
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| 191 | pred(x) |
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| 192 | {} |
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| 193 | bool operator()(typename call_traits<typename binary_traits<Predicate>::first_argument_type>::param_type x, |
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| 194 | typename call_traits<typename binary_traits<Predicate>::second_argument_type>::param_type y) const |
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| 195 | { |
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| 196 | return !pred(x,y); |
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| 197 | } |
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| 198 | private: |
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| 199 | typename binary_traits<Predicate>::function_type pred; |
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| 200 | }; |
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| 201 | |
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| 202 | template <class Predicate> |
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| 203 | binary_negate<Predicate> not2(const Predicate &pred) |
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| 204 | { |
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| 205 | // The cast is to placate Borland C++Builder in certain circumstances. |
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| 206 | // I don't think it should be necessary. |
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| 207 | return binary_negate<Predicate>((typename binary_traits<Predicate>::param_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(Predicate &pred) |
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| 212 | { |
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| 213 | return binary_negate<Predicate>(pred); |
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| 214 | } |
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| 215 | |
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| 216 | // -------------------------------------------------------------------------- |
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| 217 | // binder1st, bind1st |
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| 218 | // -------------------------------------------------------------------------- |
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| 219 | template <class Operation> |
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| 220 | class binder1st |
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| 221 | : public std::unary_function<typename binary_traits<Operation>::second_argument_type, |
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| 222 | typename binary_traits<Operation>::result_type> |
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| 223 | { |
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| 224 | public: |
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| 225 | binder1st(typename binary_traits<Operation>::param_type x, |
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| 226 | typename call_traits<typename binary_traits<Operation>::first_argument_type>::param_type y) |
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| 227 | : |
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| 228 | op(x), value(y) |
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| 229 | {} |
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| 230 | |
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| 231 | typename binary_traits<Operation>::result_type |
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| 232 | operator()(typename call_traits<typename binary_traits<Operation>::second_argument_type>::param_type x) const |
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| 233 | { |
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| 234 | return op(value, x); |
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| 235 | } |
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| 236 | |
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| 237 | protected: |
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| 238 | typename binary_traits<Operation>::function_type op; |
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| 239 | typename binary_traits<Operation>::first_argument_type value; |
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| 240 | }; |
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| 241 | |
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| 242 | template <class Operation> |
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| 243 | inline binder1st<Operation> bind1st(const Operation &op, |
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| 244 | typename call_traits< |
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| 245 | typename binary_traits<Operation>::first_argument_type |
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| 246 | >::param_type x) |
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| 247 | { |
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| 248 | // The cast is to placate Borland C++Builder in certain circumstances. |
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| 249 | // I don't think it should be necessary. |
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| 250 | return binder1st<Operation>((typename binary_traits<Operation>::param_type)op, x); |
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| 251 | } |
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| 252 | |
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| 253 | template <class Operation> |
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| 254 | inline binder1st<Operation> bind1st(Operation &op, |
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| 255 | typename call_traits< |
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| 256 | typename binary_traits<Operation>::first_argument_type |
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| 257 | >::param_type x) |
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| 258 | { |
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| 259 | return binder1st<Operation>(op, x); |
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| 260 | } |
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| 261 | |
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| 262 | // -------------------------------------------------------------------------- |
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| 263 | // binder2nd, bind2nd |
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| 264 | // -------------------------------------------------------------------------- |
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| 265 | template <class Operation> |
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| 266 | class binder2nd |
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| 267 | : public std::unary_function<typename binary_traits<Operation>::first_argument_type, |
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| 268 | typename binary_traits<Operation>::result_type> |
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| 269 | { |
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| 270 | public: |
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| 271 | binder2nd(typename binary_traits<Operation>::param_type x, |
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| 272 | typename call_traits<typename binary_traits<Operation>::second_argument_type>::param_type y) |
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| 273 | : |
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| 274 | op(x), value(y) |
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| 275 | {} |
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| 276 | |
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| 277 | typename binary_traits<Operation>::result_type |
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| 278 | operator()(typename call_traits<typename binary_traits<Operation>::first_argument_type>::param_type x) const |
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| 279 | { |
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| 280 | return op(x, value); |
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| 281 | } |
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| 282 | |
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| 283 | protected: |
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| 284 | typename binary_traits<Operation>::function_type op; |
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| 285 | typename binary_traits<Operation>::second_argument_type value; |
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| 286 | }; |
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| 287 | |
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| 288 | template <class Operation> |
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| 289 | inline binder2nd<Operation> bind2nd(const Operation &op, |
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| 290 | typename call_traits< |
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| 291 | typename binary_traits<Operation>::second_argument_type |
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| 292 | >::param_type x) |
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| 293 | { |
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| 294 | // The cast is to placate Borland C++Builder in certain circumstances. |
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| 295 | // I don't think it should be necessary. |
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| 296 | return binder2nd<Operation>((typename binary_traits<Operation>::param_type)op, x); |
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| 297 | } |
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| 298 | |
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| 299 | template <class Operation> |
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| 300 | inline binder2nd<Operation> bind2nd(Operation &op, |
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| 301 | typename call_traits< |
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| 302 | typename binary_traits<Operation>::second_argument_type |
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| 303 | >::param_type x) |
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| 304 | { |
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| 305 | return binder2nd<Operation>(op, x); |
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| 306 | } |
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| 307 | |
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| 308 | // -------------------------------------------------------------------------- |
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| 309 | // mem_fun, etc |
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| 310 | // -------------------------------------------------------------------------- |
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| 311 | template <class S, class T> |
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| 312 | class mem_fun_t : public std::unary_function<T*, S> |
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| 313 | { |
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| 314 | public: |
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| 315 | explicit mem_fun_t(S (T::*p)()) |
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| 316 | : |
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| 317 | ptr(p) |
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| 318 | {} |
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| 319 | S operator()(T* p) const |
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| 320 | { |
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| 321 | return (p->*ptr)(); |
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| 322 | } |
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| 323 | private: |
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| 324 | S (T::*ptr)(); |
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| 325 | }; |
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| 326 | |
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| 327 | template <class S, class T, class A> |
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| 328 | class mem_fun1_t : public std::binary_function<T*, A, S> |
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| 329 | { |
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| 330 | public: |
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| 331 | explicit mem_fun1_t(S (T::*p)(A)) |
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| 332 | : |
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| 333 | ptr(p) |
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| 334 | {} |
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| 335 | S operator()(T* p, typename call_traits<A>::param_type x) const |
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| 336 | { |
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| 337 | return (p->*ptr)(x); |
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| 338 | } |
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| 339 | private: |
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| 340 | S (T::*ptr)(A); |
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| 341 | }; |
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| 342 | |
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| 343 | template <class S, class T> |
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| 344 | class const_mem_fun_t : public std::unary_function<const T*, S> |
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| 345 | { |
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| 346 | public: |
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| 347 | explicit const_mem_fun_t(S (T::*p)() const) |
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| 348 | : |
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| 349 | ptr(p) |
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| 350 | {} |
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| 351 | S operator()(const T* p) const |
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| 352 | { |
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| 353 | return (p->*ptr)(); |
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| 354 | } |
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| 355 | private: |
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| 356 | S (T::*ptr)() const; |
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| 357 | }; |
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| 358 | |
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| 359 | template <class S, class T, class A> |
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| 360 | class const_mem_fun1_t : public std::binary_function<const T*, A, S> |
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| 361 | { |
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| 362 | public: |
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| 363 | explicit const_mem_fun1_t(S (T::*p)(A) const) |
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| 364 | : |
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| 365 | ptr(p) |
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| 366 | {} |
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| 367 | S operator()(const T* p, typename call_traits<A>::param_type x) const |
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| 368 | { |
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| 369 | return (p->*ptr)(x); |
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| 370 | } |
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| 371 | private: |
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| 372 | S (T::*ptr)(A) const; |
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| 373 | }; |
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| 374 | |
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| 375 | template<class S, class T> |
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| 376 | inline mem_fun_t<S,T> mem_fun(S (T::*f)()) |
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| 377 | { |
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| 378 | return mem_fun_t<S,T>(f); |
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| 379 | } |
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| 380 | |
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| 381 | template<class S, class T, class A> |
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| 382 | inline mem_fun1_t<S,T,A> mem_fun(S (T::*f)(A)) |
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| 383 | { |
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| 384 | return mem_fun1_t<S,T,A>(f); |
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| 385 | } |
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| 386 | |
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| 387 | #ifndef BOOST_NO_POINTER_TO_MEMBER_CONST |
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| 388 | template<class S, class T> |
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| 389 | inline const_mem_fun_t<S,T> mem_fun(S (T::*f)() const) |
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| 390 | { |
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| 391 | return const_mem_fun_t<S,T>(f); |
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| 392 | } |
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| 393 | |
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| 394 | template<class S, class T, class A> |
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| 395 | inline const_mem_fun1_t<S,T,A> mem_fun(S (T::*f)(A) const) |
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| 396 | { |
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| 397 | return const_mem_fun1_t<S,T,A>(f); |
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| 398 | } |
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| 399 | #endif // BOOST_NO_POINTER_TO_MEMBER_CONST |
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| 400 | |
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| 401 | // -------------------------------------------------------------------------- |
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| 402 | // mem_fun_ref, etc |
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| 403 | // -------------------------------------------------------------------------- |
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| 404 | template <class S, class T> |
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| 405 | class mem_fun_ref_t : public std::unary_function<T&, S> |
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| 406 | { |
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| 407 | public: |
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| 408 | explicit mem_fun_ref_t(S (T::*p)()) |
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| 409 | : |
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| 410 | ptr(p) |
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| 411 | {} |
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| 412 | S operator()(T& p) const |
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| 413 | { |
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| 414 | return (p.*ptr)(); |
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| 415 | } |
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| 416 | private: |
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| 417 | S (T::*ptr)(); |
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| 418 | }; |
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| 419 | |
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| 420 | template <class S, class T, class A> |
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| 421 | class mem_fun1_ref_t : public std::binary_function<T&, A, S> |
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| 422 | { |
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| 423 | public: |
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| 424 | explicit mem_fun1_ref_t(S (T::*p)(A)) |
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| 425 | : |
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| 426 | ptr(p) |
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| 427 | {} |
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| 428 | S operator()(T& p, typename call_traits<A>::param_type x) const |
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| 429 | { |
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| 430 | return (p.*ptr)(x); |
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| 431 | } |
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| 432 | private: |
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| 433 | S (T::*ptr)(A); |
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| 434 | }; |
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| 435 | |
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| 436 | template <class S, class T> |
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| 437 | class const_mem_fun_ref_t : public std::unary_function<const T&, S> |
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| 438 | { |
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| 439 | public: |
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| 440 | explicit const_mem_fun_ref_t(S (T::*p)() const) |
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| 441 | : |
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| 442 | ptr(p) |
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| 443 | {} |
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| 444 | |
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| 445 | S operator()(const T &p) const |
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| 446 | { |
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| 447 | return (p.*ptr)(); |
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| 448 | } |
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| 449 | private: |
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| 450 | S (T::*ptr)() const; |
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| 451 | }; |
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| 452 | |
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| 453 | template <class S, class T, class A> |
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| 454 | class const_mem_fun1_ref_t : public std::binary_function<const T&, A, S> |
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| 455 | { |
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| 456 | public: |
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| 457 | explicit const_mem_fun1_ref_t(S (T::*p)(A) const) |
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| 458 | : |
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| 459 | ptr(p) |
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| 460 | {} |
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| 461 | |
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| 462 | S operator()(const T& p, typename call_traits<A>::param_type x) const |
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| 463 | { |
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| 464 | return (p.*ptr)(x); |
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| 465 | } |
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| 466 | private: |
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| 467 | S (T::*ptr)(A) const; |
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| 468 | }; |
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| 469 | |
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| 470 | template<class S, class T> |
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| 471 | inline mem_fun_ref_t<S,T> mem_fun_ref(S (T::*f)()) |
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| 472 | { |
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| 473 | return mem_fun_ref_t<S,T>(f); |
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| 474 | } |
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| 475 | |
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| 476 | template<class S, class T, class A> |
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| 477 | inline mem_fun1_ref_t<S,T,A> mem_fun_ref(S (T::*f)(A)) |
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| 478 | { |
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| 479 | return mem_fun1_ref_t<S,T,A>(f); |
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| 480 | } |
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| 481 | |
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| 482 | #ifndef BOOST_NO_POINTER_TO_MEMBER_CONST |
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| 483 | template<class S, class T> |
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| 484 | inline const_mem_fun_ref_t<S,T> mem_fun_ref(S (T::*f)() const) |
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| 485 | { |
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| 486 | return const_mem_fun_ref_t<S,T>(f); |
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| 487 | } |
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| 488 | |
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| 489 | template<class S, class T, class A> |
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| 490 | inline const_mem_fun1_ref_t<S,T,A> mem_fun_ref(S (T::*f)(A) const) |
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| 491 | { |
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| 492 | return const_mem_fun1_ref_t<S,T,A>(f); |
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| 493 | } |
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| 494 | #endif // BOOST_NO_POINTER_TO_MEMBER_CONST |
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| 495 | |
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| 496 | // -------------------------------------------------------------------------- |
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| 497 | // ptr_fun |
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| 498 | // -------------------------------------------------------------------------- |
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| 499 | template <class Arg, class Result> |
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| 500 | class pointer_to_unary_function : public std::unary_function<Arg,Result> |
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| 501 | { |
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| 502 | public: |
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| 503 | explicit pointer_to_unary_function(Result (*f)(Arg)) |
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| 504 | : |
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| 505 | func(f) |
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| 506 | {} |
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| 507 | |
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| 508 | Result operator()(typename call_traits<Arg>::param_type x) const |
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| 509 | { |
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| 510 | return func(x); |
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| 511 | } |
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| 512 | |
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| 513 | private: |
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| 514 | Result (*func)(Arg); |
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| 515 | }; |
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| 516 | |
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| 517 | template <class Arg, class Result> |
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| 518 | inline pointer_to_unary_function<Arg,Result> ptr_fun(Result (*f)(Arg)) |
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| 519 | { |
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| 520 | return pointer_to_unary_function<Arg,Result>(f); |
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| 521 | } |
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| 522 | |
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| 523 | template <class Arg1, class Arg2, class Result> |
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| 524 | class pointer_to_binary_function : public std::binary_function<Arg1,Arg2,Result> |
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| 525 | { |
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| 526 | public: |
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| 527 | explicit pointer_to_binary_function(Result (*f)(Arg1, Arg2)) |
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| 528 | : |
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| 529 | func(f) |
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| 530 | {} |
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| 531 | |
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| 532 | Result operator()(typename call_traits<Arg1>::param_type x, typename call_traits<Arg2>::param_type y) const |
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| 533 | { |
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| 534 | return func(x,y); |
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| 535 | } |
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| 536 | |
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| 537 | private: |
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| 538 | Result (*func)(Arg1, Arg2); |
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| 539 | }; |
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| 540 | |
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| 541 | template <class Arg1, class Arg2, class Result> |
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| 542 | inline pointer_to_binary_function<Arg1,Arg2,Result> ptr_fun(Result (*f)(Arg1, Arg2)) |
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| 543 | { |
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| 544 | return pointer_to_binary_function<Arg1,Arg2,Result>(f); |
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| 545 | } |
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| 546 | } // namespace boost |
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| 547 | |
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| 548 | #endif |
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