#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

