objectfactory.h

来自「This software aims to create an applet a」· C头文件 代码 · 共 116 行

//
// ObjectFactory.h
//
// $Id: //poco/Main/Foundation/include/Foundation/ObjectFactory.h#1 $
//
// Definition of the ObjectFactory class.
//
// Copyright (c) 2004-2005, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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//


#ifndef Foundation_ObjectFactory_INCLUDED
#define Foundation_ObjectFactory_INCLUDED


#ifndef Foundation_Foundation_INCLUDED
#include "Foundation/Foundation.h"
#endif


Foundation_BEGIN


template <class Base>
class AbstractObjectFactory
	/// The common base class for all ObjectFactory instantiations.
	/// Used by DynamicFactory.
{
public:
	AbstractObjectFactory()
		/// Creates the AbstractObjectFactory.
	{
	}
	
	virtual ~AbstractObjectFactory()
		/// Destroys the AbstractObjectFactory.
	{
	}
	
	virtual Base* createInstance() const = 0;
		/// Creates an instance of a concrete subclass of Base.	

private:
	AbstractObjectFactory(const AbstractObjectFactory&);
	AbstractObjectFactory& operator = (const AbstractObjectFactory&);
};


template <class C, class Base>
class ObjectFactory: public AbstractObjectFactory<Base>
	/// A template class for the easy instantiation of object
	/// factories. 
	///
	/// For this factory to work, the class of which
	/// instances are to be instantiated must have a no-argument
	/// constructor.
{
public:
	ObjectFactory()
		/// Creates the ObjectFactory.
	{
	}
	
	virtual ~ObjectFactory()
		/// Destroys the ObjectFactory.
	{
	}

	Base* createInstance() const
	{
		return new C;
	}
};


Foundation_END


#endif // Foundation_ObjectFactory_INCLUDED