void (_fastcall *)() AbstractErrorProc;
AbstractErrorProc defines a callback routine for abstract method call errors.
An abstract method is a virtual or dynamic method that has no implementation in the class where it is declared. Its implementation is deferred to a descendant class. An EAbstractError exception will be thrown if a call is attempted to an abstact method.
You can define an AbstractErrorProc routine that will be called prior to the exception throw.