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122 lines
3.0 KiB
C++
122 lines
3.0 KiB
C++
#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/polymorphic_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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