Loading class by "<name>"
Posted on 1997-04-03
I am about to write an ISAPI extension, and can't work out how to dynamically load an instance of a named class whose name is discovered at run-time. All my loaded classes will be derived from the same base class, and I will only be calling the base class methods, so I only need to have the base header (I think) in my 'loader'. All my loaded instances will be implementing these base business methods differently. But I get stuck in thinking this through, as there seems to be no way of saying Declare_Dyncreate("MyClass"), only Declare_Dyncreate(MyClass), which means my loader has to know all the possibles beforehand and have a ginormous switch, and adding a new derived class will mean regenerating my loader.
Am I being naive here in thinking I can dynamically load instances of a common base class, or is there a well-known design pattern that solves this problem?