boost/statechart/in_state_reaction.hpp
#ifndef BOOST_STATECHART_IN_STATE_REACTION_HPP_INCLUDED
#define BOOST_STATECHART_IN_STATE_REACTION_HPP_INCLUDED
//////////////////////////////////////////////////////////////////////////////
// Copyright 2005-2006 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
{
class event_base;
//////////////////////////////////////////////////////////////////////////////
template< class Event,
class ReactionContext,
void ( ReactionContext::*pAction )( const Event & ) >
class in_state_reaction
{
private:
//////////////////////////////////////////////////////////////////////////
struct react_base
{
template< class State, class EventBase, class IdType >
static detail::reaction_result react(
State & stt, const EventBase & evt, const IdType & )
{
( stt.template context< ReactionContext >().*pAction )( evt );
return detail::do_discard_event;
}
};
struct react_derived
{
template< class State, class EventBase, class IdType >
static detail::reaction_result react(
State & stt, const EventBase & evt, const IdType & eventType )
{
if ( eventType == Event::static_type() )
{
( stt.template context< ReactionContext >().*pAction )(
*polymorphic_downcast< const Event * >( &evt ) );
return detail::do_discard_event;
}
else
{
return detail::no_reaction;
}
}
};
public:
//////////////////////////////////////////////////////////////////////////
// The following declarations should be private.
// They are only public because many compilers lack template friends.
//////////////////////////////////////////////////////////////////////////
template< class State, class EventBase, class IdType >
static detail::reaction_result react(
State & stt, const EventBase & evt, const IdType & eventType )
{
typedef typename mpl::if_<
is_same< Event, event_base >, react_base, react_derived
>::type impl;
return impl::react( stt, evt, eventType );
}
};
} // namespace statechart
} // namespace boost
#endif