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|---|---|---|
| 7c673cae FG |
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 |