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1 | #ifndef BOOST_STATECHART_REACTION_DISPATCHER_HPP_INCLUDED |
2 | #define BOOST_STATECHART_REACTION_DISPATCHER_HPP_INCLUDED | |
3 | ////////////////////////////////////////////////////////////////////////////// | |
4 | // Copyright 2008 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/mpl/if.hpp> | |
14 | ||
15 | #include <boost/polymorphic_cast.hpp> // boost::polymorphic_downcast | |
16 | #include <boost/type_traits/is_same.hpp> | |
17 | ||
18 | ||
19 | ||
20 | namespace boost | |
21 | { | |
22 | namespace statechart | |
23 | { | |
24 | namespace detail | |
25 | { | |
26 | ||
27 | ||
28 | ||
29 | ////////////////////////////////////////////////////////////////////////////// | |
30 | template< class Event > | |
31 | struct no_context | |
32 | { | |
33 | void no_function( const Event & ); | |
34 | }; | |
35 | ||
36 | ////////////////////////////////////////////////////////////////////////////// | |
37 | template< | |
38 | class Reactions, class State, class EventBase, class Event, | |
39 | class ActionContext, class IdType > | |
40 | class reaction_dispatcher | |
41 | { | |
42 | private: | |
43 | struct without_action | |
44 | { | |
45 | static result react( State & stt, const EventBase & ) | |
46 | { | |
47 | return Reactions::react_without_action( stt ); | |
48 | } | |
49 | }; | |
50 | ||
51 | struct base_with_action | |
52 | { | |
53 | static result react( State & stt, const EventBase & evt ) | |
54 | { | |
55 | return Reactions::react_with_action( stt, evt ); | |
56 | } | |
57 | }; | |
58 | ||
59 | struct base | |
60 | { | |
61 | static result react( | |
62 | State & stt, const EventBase & evt, const IdType & ) | |
63 | { | |
64 | typedef typename mpl::if_< | |
65 | is_same< ActionContext, detail::no_context< Event > >, | |
66 | without_action, base_with_action | |
67 | >::type reaction; | |
68 | return reaction::react( stt, evt ); | |
69 | } | |
70 | }; | |
71 | ||
72 | struct derived_with_action | |
73 | { | |
74 | static result react( State & stt, const EventBase & evt ) | |
75 | { | |
76 | return Reactions::react_with_action( | |
77 | stt, *polymorphic_downcast< const Event * >( &evt ) ); | |
78 | } | |
79 | }; | |
80 | ||
81 | struct derived | |
82 | { | |
83 | static result react( | |
84 | State & stt, const EventBase & evt, const IdType & eventType ) | |
85 | { | |
86 | if ( eventType == Event::static_type() ) | |
87 | { | |
88 | typedef typename mpl::if_< | |
89 | is_same< ActionContext, detail::no_context< Event > >, | |
90 | without_action, derived_with_action | |
91 | >::type reaction; | |
92 | return reaction::react( stt, evt ); | |
93 | } | |
94 | else | |
95 | { | |
96 | return detail::result_utility::make_result( detail::no_reaction ); | |
97 | } | |
98 | } | |
99 | }; | |
100 | ||
101 | public: | |
102 | static reaction_result react( | |
103 | State & stt, const EventBase & evt, const IdType & eventType ) | |
104 | { | |
105 | typedef typename mpl::if_< | |
106 | is_same< Event, EventBase >, base, derived | |
107 | >::type reaction; | |
108 | return result_utility::get_result( | |
109 | reaction::react( stt, evt, eventType ) ); | |
110 | } | |
111 | }; | |
112 | ||
113 | ||
114 | ||
115 | } // namespace detail | |
116 | } // namespace statechart | |
117 | } // namespace boost | |
118 | ||
119 | ||
120 | ||
121 | #endif |