session-services.hpp

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/*
  SESSION-SERVICES.hpp  -  accessing Steam-Layer internal session implementation services

  Copyright (C)         Lumiera.org
    2008,               Hermann Vosseler <Ichthyostega@web.de>

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of
  the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/


#ifndef MOBJECT_SESSION_SESSION_SERVICES_H
#define MOBJECT_SESSION_SESSION_SERVICES_H

#include "steam/mobject/session.hpp"
#include "lib/meta/generator.hpp"




namespace steam {
namespace mobject {
namespace session {
  
  using lib::meta::InstantiateChained;
  using lib::meta::Types;
  
  
  template<class API, class IMPL>
  struct ServiceAccessPoint;
  
  
  template< typename APIS
          , class FRONT
          , class SESS
          >
  class SessionServices
    : public InstantiateChained< typename APIS::List    // for each of the API types...
                               , ServiceAccessPoint    //  instantiate a service implementation
                               , SESS                 //   and stack all these on top of SessionImpl
                               >
    {
    public:
      static FRONT& current;                      
      
      template<class API>
      API& get() { return *this; }
    };
  
  
  
}}} // namespace steam::mobject::session
#endif