[857] | 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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