[12] | 1 | // Boost Lambda Library -- switch.hpp ----------------------------------- |
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| 2 | // |
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| 3 | // Copyright (C) 2000 Gary Powell (powellg@amazon.com) |
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| 4 | // Copyright (C) 1999, 2000 Jaakko Järvi (jaakko.jarvi@cs.utu.fi) |
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| 5 | // |
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| 6 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 7 | // accompanying file LICENSE_1_0.txt or copy at |
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| 8 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 9 | // |
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| 10 | // For more information, see www.boost.org |
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| 11 | |
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| 12 | // -------------------------------------------------------------------------- |
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| 13 | |
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| 14 | #if !defined(BOOST_LAMBDA_SWITCH_HPP) |
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| 15 | #define BOOST_LAMBDA_SWITCH_HPP |
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| 16 | |
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| 17 | #include "boost/lambda/core.hpp" |
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| 18 | #include "boost/lambda/detail/control_constructs_common.hpp" |
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| 19 | |
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| 20 | #include "boost/preprocessor/enum_shifted_params.hpp" |
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| 21 | #include "boost/preprocessor/repeat_2nd.hpp" |
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| 22 | #include "boost/preprocessor/tuple.hpp" |
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| 23 | |
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| 24 | namespace boost { |
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| 25 | namespace lambda { |
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| 26 | |
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| 27 | // Switch actions |
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| 28 | template <int N, class Switch1 = null_type, class Switch2 = null_type, |
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| 29 | class Switch3 = null_type, class Switch4 = null_type, |
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| 30 | class Switch5 = null_type, class Switch6 = null_type, |
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| 31 | class Switch7 = null_type, class Switch8 = null_type, |
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| 32 | class Switch9 = null_type> |
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| 33 | struct switch_action {}; |
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| 34 | |
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| 35 | |
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| 36 | namespace detail { |
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| 37 | |
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| 38 | // templates to represent special lambda functors for the cases in |
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| 39 | // switch statements |
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| 40 | |
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| 41 | template <int Value> struct case_label {}; |
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| 42 | struct default_label {}; |
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| 43 | |
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| 44 | template<class Type> struct switch_case_tag {}; |
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| 45 | |
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| 46 | // a normal case is represented as: |
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| 47 | // tagged_lambda_functor<switch_case_tag<case_label<N> > >, LambdaFunctor> |
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| 48 | |
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| 49 | // the default case as: |
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| 50 | // tagged_lambda_functor<switch_case_tag<default_label> >, LambdaFunctor> |
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| 51 | |
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| 52 | |
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| 53 | } // end detail |
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| 54 | |
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| 55 | |
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| 56 | /// create switch_case_tag tagged_lambda_functors |
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| 57 | template <int CaseValue, class Arg> |
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| 58 | inline const |
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| 59 | tagged_lambda_functor< |
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| 60 | detail::switch_case_tag<detail::case_label<CaseValue> >, |
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| 61 | lambda_functor<Arg> |
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| 62 | > |
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| 63 | case_statement(const lambda_functor<Arg>& a) { |
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| 64 | return |
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| 65 | tagged_lambda_functor< |
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| 66 | detail::switch_case_tag<detail::case_label<CaseValue> >, |
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| 67 | lambda_functor<Arg> |
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| 68 | >(a); |
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| 69 | } |
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| 70 | |
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| 71 | // No case body case. |
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| 72 | template <int CaseValue> |
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| 73 | inline const |
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| 74 | tagged_lambda_functor< |
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| 75 | detail::switch_case_tag<detail::case_label<CaseValue> >, |
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| 76 | lambda_functor< |
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| 77 | lambda_functor_base< |
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| 78 | do_nothing_action, |
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| 79 | null_type |
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| 80 | > |
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| 81 | > |
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| 82 | > |
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| 83 | case_statement() { |
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| 84 | return |
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| 85 | tagged_lambda_functor< |
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| 86 | detail::switch_case_tag<detail::case_label<CaseValue> >, |
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| 87 | lambda_functor< |
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| 88 | lambda_functor_base< |
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| 89 | do_nothing_action, |
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| 90 | null_type |
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| 91 | > |
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| 92 | > |
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| 93 | > () ; |
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| 94 | } |
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| 95 | |
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| 96 | // default label |
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| 97 | template <class Arg> |
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| 98 | inline const |
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| 99 | tagged_lambda_functor< |
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| 100 | detail::switch_case_tag<detail::default_label>, |
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| 101 | lambda_functor<Arg> |
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| 102 | > |
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| 103 | default_statement(const lambda_functor<Arg>& a) { |
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| 104 | return |
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| 105 | tagged_lambda_functor< |
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| 106 | detail::switch_case_tag<detail::default_label>, |
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| 107 | lambda_functor<Arg> |
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| 108 | >(a); |
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| 109 | } |
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| 110 | |
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| 111 | // default lable, no case body case. |
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| 112 | inline const |
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| 113 | tagged_lambda_functor< |
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| 114 | detail::switch_case_tag<detail::default_label>, |
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| 115 | lambda_functor< |
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| 116 | lambda_functor_base< |
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| 117 | do_nothing_action, |
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| 118 | null_type |
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| 119 | > |
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| 120 | > |
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| 121 | > |
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| 122 | default_statement() { |
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| 123 | return |
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| 124 | lambda_functor_base< |
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| 125 | do_nothing_action, |
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| 126 | null_type |
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| 127 | > () ; |
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| 128 | } |
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| 129 | |
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| 130 | |
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| 131 | // Specializations for lambda_functor_base of case_statement ----------------- |
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| 132 | |
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| 133 | // 0 case type: |
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| 134 | // useless (just the condition part) but provided for completeness. |
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| 135 | template<class Args> |
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| 136 | class |
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| 137 | lambda_functor_base< |
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| 138 | switch_action<1>, |
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| 139 | Args |
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| 140 | > |
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| 141 | { |
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| 142 | public: |
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| 143 | Args args; |
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| 144 | template <class SigArgs> struct sig { typedef void type; }; |
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| 145 | public: |
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| 146 | explicit lambda_functor_base(const Args& a) : args(a) {} |
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| 147 | |
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| 148 | template<class RET, CALL_TEMPLATE_ARGS> |
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| 149 | RET call(CALL_FORMAL_ARGS) const { |
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| 150 | detail::select(::boost::tuples::get<1>(args), CALL_ACTUAL_ARGS); |
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| 151 | } |
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| 152 | }; |
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| 153 | |
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| 154 | // 1 case type: |
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| 155 | // template<class Args, int Case1> |
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| 156 | // class |
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| 157 | // lambda_functor_base< |
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| 158 | // action< |
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| 159 | // 2, |
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| 160 | // return_void_action<switch_action<detail::case_label<Case1> > > |
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| 161 | // >, |
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| 162 | // Args |
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| 163 | // > |
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| 164 | // { |
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| 165 | // Args args; |
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| 166 | // public: |
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| 167 | // explicit lambda_functor_base(const Args& a) : args(a) {} |
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| 168 | |
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| 169 | // template<class RET, class A, class B, class C> |
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| 170 | // RET call(A& a, B& b, C& c) const { |
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| 171 | // switch( detail::select(::boost::tuples::get<0>(args), a, b, c) ) |
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| 172 | // { |
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| 173 | // case Case1: |
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| 174 | // detail::select(::boost::tuples::get<1>(args), a, b, c); |
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| 175 | // break; |
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| 176 | // } |
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| 177 | // } |
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| 178 | // }; |
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| 179 | |
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| 180 | // switch with default being the sole label - doesn't make much sense but |
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| 181 | // it is there for completeness |
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| 182 | // template<class Args> |
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| 183 | // class |
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| 184 | // lambda_functor_base< |
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| 185 | // action< |
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| 186 | // 2, |
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| 187 | // return_void_action<switch_action<detail::default_label> > |
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| 188 | // >, |
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| 189 | // Args |
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| 190 | // > |
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| 191 | // { |
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| 192 | // Args args; |
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| 193 | // public: |
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| 194 | // explicit lambda_functor_base(const Args& a) : args(a) {} |
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| 195 | // |
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| 196 | // template<class RET, class A, class B, class C> |
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| 197 | // RET call(A& a, B& b, C& c) const { |
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| 198 | // switch( detail::select(::boost::tuples::get<0>(args), a, b, c) ) |
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| 199 | // { |
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| 200 | // default: |
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| 201 | // detail::select(::boost::tuples::get<1>(args), a, b, c); |
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| 202 | // break; |
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| 203 | // } |
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| 204 | // } |
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| 205 | // }; |
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| 206 | |
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| 207 | |
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| 208 | |
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| 209 | // // 2 case type: |
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| 210 | // The different specializations are generated with Vesa Karvonen's |
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| 211 | // preprocessor library. |
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| 212 | |
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| 213 | // This is just a comment to show what the generated classes look like |
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| 214 | |
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| 215 | // template<class Args, int Case1, int Case2> |
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| 216 | // class |
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| 217 | // lambda_functor_base< |
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| 218 | // action<3, |
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| 219 | // return_void_action< |
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| 220 | // switch_action< |
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| 221 | // detail::case_label<Case1>, |
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| 222 | // detail::case_label<Case2> |
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| 223 | // > |
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| 224 | // > |
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| 225 | // >, |
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| 226 | // Args |
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| 227 | // > |
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| 228 | // { |
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| 229 | // Args args; |
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| 230 | // public: |
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| 231 | // explicit lambda_functor_base(const Args& a) : args(a) {} |
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| 232 | |
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| 233 | // template<class RET, class A, class B, class C> |
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| 234 | // RET call(A& a, B& b, C& c) const { |
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| 235 | // switch( detail::select(::boost::tuples::get<0>(args), a, b, c) ) |
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| 236 | // { |
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| 237 | // case Case1: |
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| 238 | // detail::select(::boost::tuples::get<1>(args), a, b, c); |
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| 239 | // break; |
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| 240 | // case Case2: |
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| 241 | // detail::select(::boost::tuples::get<2>(args), a, b, c); |
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| 242 | // break; |
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| 243 | // } |
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| 244 | // } |
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| 245 | // }; |
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| 246 | |
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| 247 | // template<class Args, int Case1> |
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| 248 | // class |
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| 249 | // lambda_functor_base< |
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| 250 | // action<3, |
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| 251 | // return_void_action< |
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| 252 | // switch_action< |
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| 253 | // detail::case_label<Case1>, |
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| 254 | // detail::default_label |
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| 255 | // > |
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| 256 | // > |
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| 257 | // >, |
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| 258 | // Args |
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| 259 | // > |
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| 260 | // { |
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| 261 | // Args args; |
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| 262 | // public: |
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| 263 | // explicit lambda_functor_base(const Args& a) : args(a) {} |
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| 264 | |
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| 265 | // template<class RET, class A, class B, class C> |
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| 266 | // RET call(A& a, B& b, C& c) const { |
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| 267 | // switch( detail::select(::boost::tuples::get<0>(args), a, b, c) ) |
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| 268 | // { |
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| 269 | // case Case1: |
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| 270 | // detail::select(::boost::tuples::get<1>(args), a, b, c); |
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| 271 | // break; |
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| 272 | // default: |
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| 273 | // detail::select(::boost::tuples::get<2>(args), a, b, c); |
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| 274 | // break; |
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| 275 | // } |
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| 276 | // } |
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| 277 | // }; |
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| 278 | // ------------------------- |
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| 279 | |
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| 280 | // Some helper preprocessor macros --------------------------------- |
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| 281 | |
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| 282 | // BOOST_LAMBDA_A_I_LIST(N, X) is a list of form X0, X1, ..., XN |
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| 283 | // BOOST_LAMBDA_A_I_B_LIST(N, X, Y) is a list of form X0 Y, X1 Y, ..., XN Y |
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| 284 | |
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| 285 | #define BOOST_LAMBDA_A_I(z, i, A) \ |
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| 286 | BOOST_PP_COMMA_IF(i) BOOST_PP_CAT(A,i) |
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| 287 | |
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| 288 | #define BOOST_LAMBDA_A_I_B(z, i, T) \ |
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| 289 | BOOST_PP_COMMA_IF(i) BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM(2,0,T),i) BOOST_PP_TUPLE_ELEM(2,1,T) |
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| 290 | |
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| 291 | #define BOOST_LAMBDA_A_I_LIST(i, A) \ |
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| 292 | BOOST_PP_REPEAT(i,BOOST_LAMBDA_A_I, A) |
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| 293 | |
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| 294 | #define BOOST_LAMBDA_A_I_B_LIST(i, A, B) \ |
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| 295 | BOOST_PP_REPEAT(i,BOOST_LAMBDA_A_I_B, (A,B)) |
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| 296 | |
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| 297 | |
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| 298 | // Switch related macros ------------------------------------------- |
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| 299 | #define BOOST_LAMBDA_SWITCH_CASE_BLOCK(z, N, A) \ |
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| 300 | case Case##N: \ |
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| 301 | detail::select(::boost::tuples::get<BOOST_PP_INC(N)>(args), CALL_ACTUAL_ARGS); \ |
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| 302 | break; |
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| 303 | |
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| 304 | #define BOOST_LAMBDA_SWITCH_CASE_BLOCK_LIST(N) \ |
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| 305 | BOOST_PP_REPEAT(N, BOOST_LAMBDA_SWITCH_CASE_BLOCK, FOO) |
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| 306 | // 2 case type: |
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| 307 | |
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| 308 | #define BOOST_LAMBDA_SWITCH_NO_DEFAULT_CASE(N) \ |
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| 309 | template<class Args, BOOST_LAMBDA_A_I_LIST(N, int Case)> \ |
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| 310 | class \ |
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| 311 | lambda_functor_base< \ |
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| 312 | switch_action<BOOST_PP_INC(N), \ |
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| 313 | BOOST_LAMBDA_A_I_B_LIST(N, detail::case_label<Case,>) \ |
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| 314 | >, \ |
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| 315 | Args \ |
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| 316 | > \ |
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| 317 | { \ |
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| 318 | public: \ |
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| 319 | Args args; \ |
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| 320 | template <class SigArgs> struct sig { typedef void type; }; \ |
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| 321 | public: \ |
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| 322 | explicit lambda_functor_base(const Args& a) : args(a) {} \ |
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| 323 | \ |
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| 324 | template<class RET, CALL_TEMPLATE_ARGS> \ |
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| 325 | RET call(CALL_FORMAL_ARGS) const { \ |
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| 326 | switch( detail::select(::boost::tuples::get<0>(args), CALL_ACTUAL_ARGS) ) \ |
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| 327 | { \ |
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| 328 | BOOST_LAMBDA_SWITCH_CASE_BLOCK_LIST(N) \ |
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| 329 | } \ |
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| 330 | } \ |
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| 331 | }; |
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| 332 | |
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| 333 | |
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| 334 | |
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| 335 | #define BOOST_LAMBDA_SWITCH_WITH_DEFAULT_CASE(N) \ |
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| 336 | template< \ |
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| 337 | class Args BOOST_PP_COMMA_IF(BOOST_PP_DEC(N)) \ |
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| 338 | BOOST_LAMBDA_A_I_LIST(BOOST_PP_DEC(N), int Case) \ |
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| 339 | > \ |
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| 340 | class \ |
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| 341 | lambda_functor_base< \ |
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| 342 | switch_action<BOOST_PP_INC(N), \ |
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| 343 | BOOST_LAMBDA_A_I_B_LIST(BOOST_PP_DEC(N), \ |
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| 344 | detail::case_label<Case, >) \ |
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| 345 | BOOST_PP_COMMA_IF(BOOST_PP_DEC(N)) \ |
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| 346 | detail::default_label \ |
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| 347 | >, \ |
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| 348 | Args \ |
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| 349 | > \ |
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| 350 | { \ |
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| 351 | public: \ |
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| 352 | Args args; \ |
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| 353 | template <class SigArgs> struct sig { typedef void type; }; \ |
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| 354 | public: \ |
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| 355 | explicit lambda_functor_base(const Args& a) : args(a) {} \ |
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| 356 | \ |
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| 357 | template<class RET, CALL_TEMPLATE_ARGS> \ |
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| 358 | RET call(CALL_FORMAL_ARGS) const { \ |
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| 359 | switch( detail::select(::boost::tuples::get<0>(args), CALL_ACTUAL_ARGS) ) \ |
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| 360 | { \ |
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| 361 | BOOST_LAMBDA_SWITCH_CASE_BLOCK_LIST(BOOST_PP_DEC(N)) \ |
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| 362 | default: \ |
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| 363 | detail::select(::boost::tuples::get<N>(args), CALL_ACTUAL_ARGS); \ |
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| 364 | break; \ |
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| 365 | } \ |
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| 366 | } \ |
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| 367 | }; |
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| 368 | |
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| 369 | |
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| 370 | |
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| 371 | |
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| 372 | |
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| 373 | |
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| 374 | // switch_statement bind functions ------------------------------------- |
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| 375 | |
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| 376 | // The zero argument case, for completeness sake |
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| 377 | inline const |
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| 378 | lambda_functor< |
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| 379 | lambda_functor_base< |
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| 380 | do_nothing_action, |
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| 381 | null_type |
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| 382 | > |
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| 383 | > |
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| 384 | switch_statement() { |
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| 385 | return |
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| 386 | lambda_functor_base< |
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| 387 | do_nothing_action, |
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| 388 | null_type |
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| 389 | > |
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| 390 | (); |
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| 391 | } |
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| 392 | |
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| 393 | // 1 argument case, this is useless as well, just the condition part |
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| 394 | template <class TestArg> |
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| 395 | inline const |
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| 396 | lambda_functor< |
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| 397 | lambda_functor_base< |
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| 398 | switch_action<1>, |
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| 399 | tuple<lambda_functor<TestArg> > |
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| 400 | > |
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| 401 | > |
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| 402 | switch_statement(const lambda_functor<TestArg>& a1) { |
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| 403 | return |
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| 404 | lambda_functor_base< |
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| 405 | switch_action<1>, |
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| 406 | tuple< lambda_functor<TestArg> > |
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| 407 | > |
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| 408 | ( tuple<lambda_functor<TestArg> >(a1)); |
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| 409 | } |
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| 410 | |
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| 411 | |
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| 412 | #define HELPER(z, N, FOO) \ |
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| 413 | BOOST_PP_COMMA_IF(N) \ |
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| 414 | BOOST_PP_CAT( \ |
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| 415 | const tagged_lambda_functor<detail::switch_case_tag<TagData, \ |
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| 416 | N>) \ |
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| 417 | BOOST_PP_COMMA() Arg##N>& a##N |
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| 418 | |
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| 419 | #define HELPER_LIST(N) BOOST_PP_REPEAT(N, HELPER, FOO) |
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| 420 | |
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| 421 | |
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| 422 | #define BOOST_LAMBDA_SWITCH_STATEMENT(N) \ |
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| 423 | template <class TestArg, \ |
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| 424 | BOOST_LAMBDA_A_I_LIST(N, class TagData), \ |
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| 425 | BOOST_LAMBDA_A_I_LIST(N, class Arg)> \ |
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| 426 | inline const \ |
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| 427 | lambda_functor< \ |
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| 428 | lambda_functor_base< \ |
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| 429 | switch_action<BOOST_PP_INC(N), \ |
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| 430 | BOOST_LAMBDA_A_I_LIST(N, TagData) \ |
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| 431 | >, \ |
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| 432 | tuple<lambda_functor<TestArg>, BOOST_LAMBDA_A_I_LIST(N, Arg)> \ |
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| 433 | > \ |
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| 434 | > \ |
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| 435 | switch_statement( \ |
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| 436 | const lambda_functor<TestArg>& ta, \ |
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| 437 | HELPER_LIST(N) \ |
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| 438 | ) \ |
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| 439 | { \ |
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| 440 | return \ |
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| 441 | lambda_functor_base< \ |
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| 442 | switch_action<BOOST_PP_INC(N), \ |
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| 443 | BOOST_LAMBDA_A_I_LIST(N, TagData) \ |
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| 444 | >, \ |
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| 445 | tuple<lambda_functor<TestArg>, BOOST_LAMBDA_A_I_LIST(N, Arg)> \ |
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| 446 | > \ |
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| 447 | ( tuple<lambda_functor<TestArg>, BOOST_LAMBDA_A_I_LIST(N, Arg)> \ |
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| 448 | (ta, BOOST_LAMBDA_A_I_LIST(N, a) )); \ |
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| 449 | } |
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| 450 | |
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| 451 | |
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| 452 | |
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| 453 | |
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| 454 | // Here's the actual generation |
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| 455 | |
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| 456 | #define BOOST_LAMBDA_SWITCH(N) \ |
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| 457 | BOOST_LAMBDA_SWITCH_NO_DEFAULT_CASE(N) \ |
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| 458 | BOOST_LAMBDA_SWITCH_WITH_DEFAULT_CASE(N) |
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| 459 | |
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| 460 | // Use this to avoid case 0, these macros work only from case 1 upwards |
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| 461 | #define BOOST_LAMBDA_SWITCH_HELPER(z, N, A) \ |
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| 462 | BOOST_LAMBDA_SWITCH( BOOST_PP_INC(N) ) |
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| 463 | |
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| 464 | // Use this to avoid cases 0 and 1, these macros work only from case 2 upwards |
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| 465 | #define BOOST_LAMBDA_SWITCH_STATEMENT_HELPER(z, N, A) \ |
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| 466 | BOOST_LAMBDA_SWITCH_STATEMENT(BOOST_PP_INC(N)) |
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| 467 | |
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| 468 | |
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| 469 | |
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| 470 | // up to 9 cases supported (counting default:) |
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| 471 | BOOST_PP_REPEAT_2ND(9,BOOST_LAMBDA_SWITCH_HELPER,FOO) |
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| 472 | BOOST_PP_REPEAT_2ND(9,BOOST_LAMBDA_SWITCH_STATEMENT_HELPER,FOO) |
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| 473 | |
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| 474 | |
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| 475 | } // namespace lambda |
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| 476 | } // namespace boost |
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| 477 | |
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| 478 | |
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| 479 | #undef HELPER |
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| 480 | #undef HELPER_LIST |
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| 481 | |
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| 482 | #undef BOOST_LAMBDA_SWITCH_HELPER |
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| 483 | #undef BOOST_LAMBDA_SWITCH |
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| 484 | #undef BOOST_LAMBDA_SWITCH_NO_DEFAULT_CASE |
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| 485 | #undef BOOST_LAMBDA_SWITCH_WITH_DEFAULT_CASE |
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| 486 | |
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| 487 | #undef BOOST_LAMBDA_SWITCH_CASE_BLOCK |
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| 488 | #undef BOOST_LAMBDA_SWITCH_CASE_BLOCK_LIST |
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| 489 | |
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| 490 | #undef BOOST_LAMBDA_SWITCH_STATEMENT |
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| 491 | #undef BOOST_LAMBDA_SWITCH_STATEMENT_HELPER |
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| 492 | |
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| 493 | |
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| 494 | |
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| 495 | #endif |
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| 496 | |
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| 497 | |
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| 498 | |
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| 499 | |
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| 500 | |
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| 501 | |
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| 502 | |
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