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