What is the name of this method?

Question

In the encoding in the Delphi book, an example of an interface restriction is given:

1    type
2      IStoppable  =  interface
3        procedure Stop;
4      end;
5
6      TWidget<T: IStoppable>  =  class
7        FProcess: T;
8        procedure StopProcess;
9      end;
10
11   { TWidget<T> }
12
13   procedure  TWidget<T>.StopProcess;
14   begin
15     FProcess.Stop;
16   end;

I don’t understand on line 15 what he calls the Stop method? isn't FProcess a shared variable? So how can it call a method from a variable?

Also, how can he call the Stop method directly from the interface? Shouldn't he call an implemented method?

Answer 1

FProcesshas a type Twhere it is Tlimited to an interface that is IStoppableeither one derived from IStoppable. Calling the method you are referencing calls the method Stop IStoppable.

Imagine being FProcessdeclared as a type IStoppable.

FProcess: IStoppable;

If that were the case, I think you will understand the code.

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Answer 2

FProcess T, IStoppable, : T IStoppable ( ) , IStoppable

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