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panda/src/putil/factory.h

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// Filename: factory.h
// Created by:  drose (08May00)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://www.panda3d.org/license.txt .
//
// To contact the maintainers of this program write to
// panda3d@yahoogroups.com .
//
////////////////////////////////////////////////////////////////////

#ifndef FACTORY_H
#define FACTORY_H

#include <pandabase.h>

#include "factoryBase.h"

////////////////////////////////////////////////////////////////////
//       Class : Factory
// Description : A Factory can be used to create an instance of a
//               particular subclass of some general base class.  Each
//               subclass registers itself with the Factory, supplying
//               a function that will construct an instance of that
//               subclass; the Factory can later choose a suitable
//               subclass and return a newly-constructed pointer to an
//               object of that type on the user's demand.  This is
//               used, for instance, to manage the set of
//               GraphicsPipes available to the user.
//
//               This is a thin template wrapper around FactoryBase.
//               All it does is ensure the types are correctly cast.
//               All of its methods are inline, and it has no data
//               members, so it is not necessary to export the class
//               from the DLL.
////////////////////////////////////////////////////////////////////
template<class Type>
class Factory : public FactoryBase {
public:
  typedef Type *CreateFunc(const FactoryParams &params);

  INLINE Type *make_instance(TypeHandle handle,
                             const FactoryParams &params = FactoryParams());

  INLINE Type *make_instance(const string &type_name,
                             const FactoryParams &params = FactoryParams());

  INLINE Type *
  make_instance_more_general(TypeHandle handle,
                             const FactoryParams &params = FactoryParams());

  INLINE Type *
  make_instance_more_general(const string &type_name,
                             const FactoryParams &params = FactoryParams());

  INLINE void register_factory(TypeHandle handle, CreateFunc *func);
};

#include "factory.I"

#endif

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