argument-erasure.hpp

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/*
  ARGUMENT-ERASURE.hpp  -  helper for passing on a dynamic typed argument tuple

  Copyright (C)         Lumiera.org
    2009,               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 CONTROL_ARGUMENT_ERASURE_H
#define CONTROL_ARGUMENT_ERASURE_H

#include "lib/error.hpp"


namespace lumiera {
namespace error   {
  LUMIERA_ERROR_DECLARE (INVALID_ARGUMENTS);  
  LUMIERA_ERROR_DECLARE (UNBOUND_ARGUMENTS);  
}}

namespace steam   {
namespace control {
  namespace err = lumiera::error;
  
  
  struct Arguments;
  
  template<typename TUP>
  struct TypedArguments;
  
  
  struct Arguments
    {
      virtual ~Arguments() {}
     
      template<typename TUP>
      TUP const&
      get()
        {
          TypedArguments<TUP>* dest = dynamic_cast<TypedArguments<TUP>*> (this);
          if (not dest)
            throw err::Invalid{"Wrong type or number of arguments"
                              , LERR_(INVALID_ARGUMENTS)};
          return dest->args_;
        }
    };
  
  
  template<typename TUP>
  struct TypedArguments
    : Arguments
    {
      TUP const& args_;
      
      TypedArguments (TUP const& a)
        : args_(a)
        { }
    };
  
  
  
}} // namespace steam::control
#endif