Factory Pattern: Polymorphism with Type and Instance Overrides: Exercises

Practice exercises

Exercise 1

You need parity checking only in `rx_agent` traffic, not `tx_agent`. Which override should you apply?

Solution

Use `set_inst_override` on the specific `rx_agent` path so only that instance switches to the parity-aware subtype.

Exercise 2

A teammate created transactions with `base_item req = new("req");` and override stopped working. How do you fix it?

Solution

Replace direct construction with `base_item::type_id::create("req")` so the factory can resolve override policy.

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