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// Instantiator.h
//
// $Id: //poco/1.3/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 Base>
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 C, class Base>
class Instantiator: public AbstractInstantiator<Base>
/// 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
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