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The Instantiator Class Template<br />
> An instantiator for a class C must always be a subclass of<br />
<strong>Poco</strong>::AbstractInstantiator, where Base is a base class of C.<br />
> <strong>Poco</strong>::Instantiator is a template for a factory for a given class.<br />
> It basically defines a method createInstance() that creates a new<br />
instance of a class, using the new operator.<br />
> To work with class hierarchies, an Instantiator always inherits<br />
from <strong>Poco</strong>::AbstractInstantiator, which defines createInstance()<br />
for the base class.
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