Search code examples
swiftgeneric-programming

Generic class which generic is itself a generic

So I have a generic class FirstClass<T: SomeProtocol>, and I have a second class (which inherit from NSObject) where it contains an array of FirstClass, and have functions that return element of the array (so returning a FirstClass<T>).

Actually I am having some trouble with the syntax.

SecondClass<F>: NSObject where F == FirstCall<S>, S: SomeProtocol {} I think this is the declaration which illustrate the best what I want to achieve.

Here I have an error: Use of undeclared type 'T'.

I would like to know if this could be achieve with a specific syntax or if I take a bad path.

Thank you

Solution

  • I think you want to do something like this

    protocol SomeProtocol {

}

class FirstClass<T: SomeProtocol> {

}

class SecondClass<F,T:SomeProtocol>:NSObject where F:FirstClass<T> {

}