1 #ifndef BOOST_STATECHART_CUSTOM_REACTION_HPP_INCLUDED
2 #define BOOST_STATECHART_CUSTOM_REACTION_HPP_INCLUDED
3 //////////////////////////////////////////////////////////////////////////////
4 // Copyright 2002-2006 Andreas Huber Doenni
5 // Distributed under the Boost Software License, Version 1.0. (See accompany-
6 // ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7 //////////////////////////////////////////////////////////////////////////////
8 
9 
10 
11 #include <boost/statechart/result.hpp>
12 
13 #include <boost/polymorphic_cast.hpp> // boost::polymorphic_downcast
14 
15 
16 
17 namespace boost
18 {
19 namespace statechart
20 {
21 
22 
23 
24 class event_base;
25 
26 //////////////////////////////////////////////////////////////////////////////
27 template< class Event >
28 class custom_reaction
29 {
30   public:
31     //////////////////////////////////////////////////////////////////////////
32     // The following declarations should be private.
33     // They are only public because many compilers lack template friends.
34     //////////////////////////////////////////////////////////////////////////
35     template< class State, class EventBase, class IdType >
react(State & stt,const EventBase & evt,const IdType & eventType)36     static detail::reaction_result react(
37       State & stt, const EventBase & evt, const IdType & eventType )
38     {
39       if ( eventType == Event::static_type() )
40       {
41         return detail::result_utility::get_result(
42           stt.react( *polymorphic_downcast< const Event * >( &evt ) ) );
43       }
44       else
45       {
46         return detail::no_reaction;
47       }
48     }
49 };
50 
51 template<>
52 class custom_reaction< event_base >
53 {
54   public:
55     //////////////////////////////////////////////////////////////////////////
56     // The following declarations should be private.
57     // They are only public because many compilers lack template friends.
58     //////////////////////////////////////////////////////////////////////////
59     template< class State, class EventBase, class IdType >
react(State & stt,const EventBase & evt,const IdType &)60     static detail::reaction_result react(
61       State & stt, const EventBase & evt, const IdType & )
62     {
63       return detail::result_utility::get_result( stt.react( evt ) );
64     }
65 };
66 
67 
68 
69 } // namespace statechart
70 } // namespace boost
71 
72 
73 
74 #endif
75