Chris@16: // Copyright 2008 Christophe Henry
Chris@16: // henry UNDERSCORE christophe AT hotmail DOT com
Chris@16: // This is an extended version of the state machine available in the boost::mpl library
Chris@16: // Distributed under the same license as the original.
Chris@16: // Copyright for the original version:
Chris@16: // Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed
Chris@16: // under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_MSM_BACK_ARGS_H
Chris@16: #define BOOST_MSM_BACK_ARGS_H
Chris@16: 
Chris@16: #include <boost/preprocessor/repetition/enum_params.hpp>
Chris@16: #include <boost/preprocessor/arithmetic/sub.hpp>
Chris@16: #include <boost/preprocessor/punctuation/comma_if.hpp>
Chris@16: #include <boost/preprocessor/control/expr_if.hpp> 
Chris@16: #include <boost/preprocessor/punctuation/comma.hpp>
Chris@16: #include <boost/preprocessor/arithmetic/add.hpp>
Chris@16: #include <boost/preprocessor/cat.hpp>
Chris@16: #include <boost/preprocessor/comparison/less.hpp>
Chris@16: #include <boost/preprocessor/arithmetic/dec.hpp>
Chris@16: #include <boost/function.hpp>
Chris@16: 
Chris@16: #ifndef BOOST_MSM_VISITOR_ARG_SIZE
Chris@16: #define BOOST_MSM_VISITOR_ARG_SIZE 2 // default max number of arguments
Chris@16: #endif
Chris@16: 
Chris@16: namespace boost { namespace msm { namespace back
Chris@16: {
Chris@16: struct no_args {};
Chris@16: #define MSM_ARGS_TYPEDEF_SUB(z, n, unused) typedef ARG ## n argument ## n ;
Chris@16: #define MSM_ARGS_PRINT(z, n, data) data
Chris@16: #define MSM_ARGS_NONE_PRINT(z, n, data) class data ## n = no_args                          \
Chris@16:     BOOST_PP_COMMA_IF( BOOST_PP_LESS(n, BOOST_PP_DEC(BOOST_MSM_VISITOR_ARG_SIZE) ) )                  
Chris@16: 
Chris@16: #define MSM_VISITOR_MAIN_ARGS(n)                                                        \
Chris@16:     template <class RES,                                                                \
Chris@16:               BOOST_PP_REPEAT(BOOST_MSM_VISITOR_ARG_SIZE, MSM_ARGS_NONE_PRINT, ARG)>    \
Chris@16:     struct args                                                                         \
Chris@16:     {                                                                                   \
Chris@16:         typedef ::boost::function<RES(BOOST_PP_ENUM_PARAMS(n, ARG))> type;              \
Chris@16:         enum {args_number=n};                                                           \
Chris@16:         BOOST_PP_REPEAT(n, MSM_ARGS_TYPEDEF_SUB, ~ )                                    \
Chris@16:     };
Chris@16: 
Chris@16: #define MSM_VISITOR_ARGS(z, n, unused)                                                              \
Chris@16:     template <class RES BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n, class ARG)>                    \
Chris@16:     struct args<RES,                                                                                \
Chris@16:                 BOOST_PP_ENUM_PARAMS(n,ARG)                                                         \
Chris@16:                 BOOST_PP_COMMA_IF(n)                                                                \
Chris@16:                 BOOST_PP_ENUM(BOOST_PP_SUB(BOOST_MSM_VISITOR_ARG_SIZE,n), MSM_ARGS_PRINT, no_args)     \
Chris@16:                 >                                                                                   \
Chris@16:     {                                                                                               \
Chris@16:         typedef ::boost::function<RES(BOOST_PP_ENUM_PARAMS(n, ARG))> type;                          \
Chris@16:         enum {args_number=n};                                                                       \
Chris@16:         BOOST_PP_REPEAT(n, MSM_ARGS_TYPEDEF_SUB, ~ )                                                \
Chris@16:     };
Chris@16: MSM_VISITOR_MAIN_ARGS(BOOST_MSM_VISITOR_ARG_SIZE)
Chris@16: BOOST_PP_REPEAT(BOOST_MSM_VISITOR_ARG_SIZE, MSM_VISITOR_ARGS, ~)
Chris@16: 
Chris@16: #undef MSM_VISITOR_ARGS
Chris@16: #undef MSM_ARGS_PRINT
Chris@16: 
Chris@16: }}}
Chris@16: 
Chris@16: #endif //BOOST_MSM_BACK_ARGS_H
Chris@16: