Make a protocol conform to another protocol

Question

I have two protocols: Pen and InstrumentForProfessional. I\'d like to make any Pen to be an InstrumentForProfessional:

protoc         


        

Answer 1

I think if you check over at this SO answer, it solves the same problem.

https://stackoverflow.com/a/37353146/1070718

@paper1111 was close to what you're looking for, but I think you really want to do :

extension InstrumentForProfessional where Self: Pen {}

Since Pen already conforms to InstrumentForProfessional then you just need to extend InstrumentForProfessional when it is a Pen.

Sometimes I forget how protocol inheritance works in Swift but thanks to SO for refreshing my memory.