69 lines
3.6 KiB
C++
69 lines
3.6 KiB
C++
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// Copyright 2008 Christophe Henry
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// henry UNDERSCORE christophe AT hotmail DOT com
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// This is an extended version of the state machine available in the boost::mpl library
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// Distributed under the same license as the original.
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// Copyright for the original version:
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// Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed
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// under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_MSM_BACK_ARGS_H
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#define BOOST_MSM_BACK_ARGS_H
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/arithmetic/sub.hpp>
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#include <boost/preprocessor/punctuation/comma_if.hpp>
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#include <boost/preprocessor/control/expr_if.hpp>
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#include <boost/preprocessor/punctuation/comma.hpp>
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#include <boost/preprocessor/arithmetic/add.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/comparison/less.hpp>
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#include <boost/preprocessor/arithmetic/dec.hpp>
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#include <boost/function.hpp>
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#ifndef BOOST_MSM_VISITOR_ARG_SIZE
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#define BOOST_MSM_VISITOR_ARG_SIZE 2 // default max number of arguments
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#endif
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namespace boost { namespace msm { namespace back
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{
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struct no_args {};
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#define MSM_ARGS_TYPEDEF_SUB(z, n, unused) typedef ARG ## n argument ## n ;
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#define MSM_ARGS_PRINT(z, n, data) data
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#define MSM_ARGS_NONE_PRINT(z, n, data) class data ## n = no_args \
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BOOST_PP_COMMA_IF( BOOST_PP_LESS(n, BOOST_PP_DEC(BOOST_MSM_VISITOR_ARG_SIZE) ) )
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#define MSM_VISITOR_MAIN_ARGS(n) \
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template <class RES, \
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BOOST_PP_REPEAT(BOOST_MSM_VISITOR_ARG_SIZE, MSM_ARGS_NONE_PRINT, ARG)> \
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struct args \
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{ \
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typedef ::boost::function<RES(BOOST_PP_ENUM_PARAMS(n, ARG))> type; \
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enum {args_number=n}; \
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BOOST_PP_REPEAT(n, MSM_ARGS_TYPEDEF_SUB, ~ ) \
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};
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#define MSM_VISITOR_ARGS(z, n, unused) \
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template <class RES BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n, class ARG)> \
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struct args<RES, \
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BOOST_PP_ENUM_PARAMS(n,ARG) \
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BOOST_PP_COMMA_IF(n) \
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BOOST_PP_ENUM(BOOST_PP_SUB(BOOST_MSM_VISITOR_ARG_SIZE,n), MSM_ARGS_PRINT, no_args) \
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> \
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{ \
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typedef ::boost::function<RES(BOOST_PP_ENUM_PARAMS(n, ARG))> type; \
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enum {args_number=n}; \
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BOOST_PP_REPEAT(n, MSM_ARGS_TYPEDEF_SUB, ~ ) \
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};
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MSM_VISITOR_MAIN_ARGS(BOOST_MSM_VISITOR_ARG_SIZE)
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BOOST_PP_REPEAT(BOOST_MSM_VISITOR_ARG_SIZE, MSM_VISITOR_ARGS, ~)
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#undef MSM_VISITOR_ARGS
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#undef MSM_ARGS_PRINT
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}}}
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#endif //BOOST_MSM_BACK_ARGS_H
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