// // Instantiator.h // // $Id: //poco/1.4/Foundation/include/Poco/Instantiator.h#1 $ // // Library: Foundation // Package: Core // Module: Instantiator // // Definition of the Instantiator class. // // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. // and Contributors. // // Permission is hereby granted, free of charge, to any person or organization // obtaining a copy of the software and accompanying documentation covered by // this license (the "Software") to use, reproduce, display, distribute, // execute, and transmit the Software, and to prepare derivative works of the // Software, and to permit third-parties to whom the Software is furnished to // do so, all subject to the following: // // The copyright notices in the Software and this entire statement, including // the above license grant, this restriction and the following disclaimer, // must be included in all copies of the Software, in whole or in part, and // all derivative works of the Software, unless such copies or derivative // works are solely in the form of machine-executable object code generated by // a source language processor. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER // DEALINGS IN THE SOFTWARE. // #ifndef Foundation_Instantiator_INCLUDED #define Foundation_Instantiator_INCLUDED #include "Poco/Foundation.h" namespace Poco { template class AbstractInstantiator /// The common base class for all Instantiator instantiations. /// Used by DynamicFactory. { public: AbstractInstantiator() /// Creates the AbstractInstantiator. { } virtual ~AbstractInstantiator() /// Destroys the AbstractInstantiator. { } virtual Base* createInstance() const = 0; /// Creates an instance of a concrete subclass of Base. private: AbstractInstantiator(const AbstractInstantiator&); AbstractInstantiator& operator = (const AbstractInstantiator&); }; template class Instantiator: public AbstractInstantiator /// A template class for the easy instantiation of /// instantiators. /// /// For the Instantiator to work, the class of which /// instances are to be instantiated must have a no-argument /// constructor. { public: Instantiator() /// Creates the Instantiator. { } virtual ~Instantiator() /// Destroys the Instantiator. { } Base* createInstance() const { return new C; } }; } // namespace Poco #endif // Foundation_Instantiator_INCLUDED