Why did I get the error “error C2259: … cannot instantiate abstract class”?

To fix the specific problem, you need to declare a destructor for ElectricGuitarComponentFactory because you have declared the destructor of the base class as a pure virtual function. Why you have declared the base class destructor as pure virtual, I don't know; it really doesn't make any sense to do that. The destructor should be declared virtual, but not as pure virtual.

In your derived ElectricGuitarComponentFactory you don't provide a destructor, hence it's still an abstract class.

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