EAbstractError = class(Exception);
class PASCALIMPLEMENTATION EAbstractError : public Exception
EAbstractError is the exception class for attempts to call an abstract method.
EAbstractError is raised when an application tries to call a Delphi abstract method. It is also raised at design time when a component with Delphi abstract method is placed on a form.
Delphi abstract methods are declared with the abstract directive and must be overridden in descendant classes before an instance object can be created.
C++ code can catch this error, but never throws it.