[fpc-devel] "Friend" classes?

Michael Van Canneyt michael.vancanneyt at wisa.be
Tue Mar 15 16:32:19 CET 2005

On Tue, 15 Mar 2005, DrDiettrich wrote:

> I just came about code that uses protected members of other classes,
> defined in other units. In Delphi this possible by a declaration like:
> type TFriendClass = class(TNotMyClass);

This is a simple descendent.

> After this declaration the protected (and private?) members of
> TNotMyClass are accessible, using TFriendClass as an type alias.
> Now my questions:
> 1) Is such behaviour also available with FPC? In non-Delphi modes?

Yes. Only protected.

> 2) How portable are such "friend" classes? Does there exist some (other)
> standard for this purpose?

The above is a simple descendent, so I'm not sure about this 'friend' ?

> 3) What alternatives could be used, so that not all class members must
> be made public, when they shall be used only in specific related units?

? Please explain.


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