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121 lines
2.9 KiB
121 lines
2.9 KiB
#ifndef BOOST_STATECHART_REACTION_DISPATCHER_HPP_INCLUDED |
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#define BOOST_STATECHART_REACTION_DISPATCHER_HPP_INCLUDED |
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////////////////////////////////////////////////////////////////////////////// |
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// Copyright 2008 Andreas Huber Doenni |
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// Distributed under the Boost Software License, Version 1.0. (See accompany- |
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// ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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////////////////////////////////////////////////////////////////////////////// |
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#include <boost/statechart/result.hpp> |
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#include <boost/mpl/if.hpp> |
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#include <boost/cast.hpp> // boost::polymorphic_downcast |
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#include <boost/type_traits/is_same.hpp> |
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namespace boost |
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{ |
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namespace statechart |
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{ |
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namespace detail |
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{ |
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////////////////////////////////////////////////////////////////////////////// |
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template< class Event > |
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struct no_context |
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{ |
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void no_function( const Event & ); |
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}; |
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////////////////////////////////////////////////////////////////////////////// |
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template< |
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class Reactions, class State, class EventBase, class Event, |
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class ActionContext, class IdType > |
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class reaction_dispatcher |
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{ |
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private: |
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struct without_action |
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{ |
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static result react( State & stt, const EventBase & ) |
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{ |
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return Reactions::react_without_action( stt ); |
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} |
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}; |
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struct base_with_action |
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{ |
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static result react( State & stt, const EventBase & evt ) |
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{ |
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return Reactions::react_with_action( stt, evt ); |
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} |
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}; |
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struct base |
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{ |
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static result react( |
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State & stt, const EventBase & evt, const IdType & ) |
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{ |
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typedef typename mpl::if_< |
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is_same< ActionContext, detail::no_context< Event > >, |
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without_action, base_with_action |
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>::type reaction; |
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return reaction::react( stt, evt ); |
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} |
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}; |
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struct derived_with_action |
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{ |
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static result react( State & stt, const EventBase & evt ) |
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{ |
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return Reactions::react_with_action( |
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stt, *polymorphic_downcast< const Event * >( &evt ) ); |
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} |
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}; |
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struct derived |
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{ |
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static result react( |
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State & stt, const EventBase & evt, const IdType & eventType ) |
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{ |
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if ( eventType == Event::static_type() ) |
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{ |
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typedef typename mpl::if_< |
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is_same< ActionContext, detail::no_context< Event > >, |
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without_action, derived_with_action |
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>::type reaction; |
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return reaction::react( stt, evt ); |
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} |
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else |
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{ |
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return detail::result_utility::make_result( detail::no_reaction ); |
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} |
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} |
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}; |
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public: |
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static reaction_result react( |
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State & stt, const EventBase & evt, const IdType & eventType ) |
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{ |
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typedef typename mpl::if_< |
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is_same< Event, EventBase >, base, derived |
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>::type reaction; |
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return result_utility::get_result( |
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reaction::react( stt, evt, eventType ) ); |
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} |
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}; |
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} // namespace detail |
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} // namespace statechart |
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} // namespace boost |
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#endif
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