custom_reaction.hpp

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#ifndef BOOST_STATECHART_CUSTOM_REACTION_HPP_INCLUDED
#define BOOST_STATECHART_CUSTOM_REACTION_HPP_INCLUDED
// Copyright 2002-2006 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/polymorphic_cast.hpp> // boost::polymorphic_downcast
 
 
 
namespace boost
{
namespace statechart
{
 
 
 
class event_base;
 
template< class Event >
class custom_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 )
    {
      if ( eventType == Event::static_type() )
      {
        return detail::result_utility::get_result( 
          stt.react( *polymorphic_downcast< const Event * >( &evt ) ) );
      }
      else
      {
        return detail::no_reaction;
      }
    }
};
 
template<>
class custom_reaction< event_base >
{
  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 & )
    {
      return detail::result_utility::get_result( stt.react( evt ) );
    }
};
 
 
 
} // namespace statechart
} // namespace boost
 
 
 
#endif