Interfaces and TFPGMaps

[Чебурашка]

Good evening,
I have this

Code: Pascal  [Select][+][-]

1. unit sample
2.  
3. interface
4.  
5. type
6.   IIntf = interface
7.         ['{00000000-0000-0000-0000-000000000000}']
8.      function MakeSomething(inputValue: Integer): Integer;
9.   end;
10.  
11.   TImpl = class(TInterfacedObject, IIntf)
12.      // Implementation of IIntf
13.      function MakeSomething(inputValue: Integer): Integer;
14.      // Other methods
15.      function MakeSomethingElse(inputValue: Integer): Integer;
16.   end;
17.  
18. implementation
19.  
20. procedure TImpl.MakeSomething(inputValue: Integer): Integer;
21. begin
22.   Result := inputValue + 1;
23. end;
24.  
25. procedure TImpl.MakeSomethingElse(inputValue: Integer): Integer;
26. begin
27.   Result := inputValue + 2;
28. end;
29.  
30. end.
31.  

Then I have a situation in which I need a generic map <string, IIntf>, because I need using clients not to see the extra methods available on the implementations of IIntf.

Reading the documentation I understand that in this case I must use a TFPGMapInterfacedObjectData (because I am dealing with refcounted material) not a TFPGMap. Is this correct?

Then I also have another situation in which I need a generic map <string, TImpl>, because I need using clients to see all methods available on TImpl.

In this case should I use a TFPGMap<string, TImpl> or should I use a TFPGMapInterfacedObjectData<string, TImpl>?

The point is: is TFPGMapInterfacedObjectData necessary everytime we are using TInterfacedObject as a base class? or does it depend on what we put in the data part of the map?

Thanks

[Чебурашка]

Reading more carefully documentation

https://www.freepascal.org/docs-html/current/rtl/fgl/tfpgmapinterfacedobjectdata.html

seems that I must use in both cases TFPGMapInterfacedObjectData.

Just please some guru to confirm.