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