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105 lines
2.8 KiB
C++
105 lines
2.8 KiB
C++
//
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// Instantiator.h
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//
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// $Id: //poco/Main/Foundation/include/Poco/Instantiator.h#2 $
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//
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// Library: Foundation
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// Package: Core
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// Module: Instantiator
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//
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// Definition of the Instantiator class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef Foundation_Instantiator_INCLUDED
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#define Foundation_Instantiator_INCLUDED
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#include "Poco/Foundation.h"
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namespace Poco {
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template <class Base>
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class AbstractInstantiator
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/// The common base class for all Instantiator instantiations.
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/// Used by DynamicFactory.
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{
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public:
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AbstractInstantiator()
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/// Creates the AbstractInstantiator.
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{
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}
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virtual ~AbstractInstantiator()
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/// Destroys the AbstractInstantiator.
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{
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}
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virtual Base* createInstance() const = 0;
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/// Creates an instance of a concrete subclass of Base.
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private:
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AbstractInstantiator(const AbstractInstantiator&);
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AbstractInstantiator& operator = (const AbstractInstantiator&);
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};
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template <class C, class Base>
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class Instantiator: public AbstractInstantiator<Base>
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/// A template class for the easy instantiation of
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/// instantiators.
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///
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/// For the Instantiator to work, the class of which
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/// instances are to be instantiated must have a no-argument
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/// constructor.
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{
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public:
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Instantiator()
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/// Creates the Instantiator.
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{
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}
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virtual ~Instantiator()
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/// Destroys the Instantiator.
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{
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}
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Base* createInstance() const
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{
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return new C;
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}
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};
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} // namespace Poco
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#endif // Foundation_Instantiator_INCLUDED
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