SystemVerilog OOP Mastery · All levels
Polymorphism and Dispatch Semantics: Interview Questions
Interview Questions for Polymorphism and Dispatch Semantics.
Interview questions
Q1. What two conditions must hold for polymorphism to change runtime behavior in SV?
Answer: A base handle must reference a derived object, and the called method must be virtual in the base declaration.
Q2. Why is $cast preferred over direct assignment for downcast?
Answer: $cast provides explicit runtime type checking and a success/fail result, so code can branch safely instead of dereferencing an invalid derived handle.
Q3. How does polymorphism help UVM architecture quality?
Answer: It lets framework and infrastructure code stay generic while concrete behavior changes via factory-selected derived classes, reducing protocol-specific duplication.