I want this protocol:

protocol AddsMoreCommands {
    /* ... */
}
only to be adopted by classes that inherit from the class UIViewController. This page tells me I can specify that it is only ado...

I find myself having trouble making code generic when using class-constrained protocols in contexts requiring AnyObject. Since a protocol used as a type does not conform to the protocols from which it inherits, the code snippets below do not compile.  A couple quick examples:  If we want to box an arbitrary value to hold a reference weakly, the boxed type must conform to AnyObject, but this prevents us from boxing instances class-constrained protocols:  struct WeakBox<T: AnyObject> {     weak va...