Re: [Oorexx-devel] CSelf and mixin classes

[Mark M. <mie...@gm...>]

On Mon, Aug 24, 2009 at 3:52 PM, Rick McGuire<obj...@gm...> wrote:

> The code for CSELF searches through all of the scopes of the objects
> in inheritance order looking for the first occurrence of a CSELF
> variable in the object, and that occurrence is the value returned for
> all CSELF references.  This is essentially first one found wins, but
> it is the mechanism that allows subclasses to access the CSELF value
> defined by the base class.

Okay, that is pretty much what I understood.

So in this definition

::class 'WindowBase' public mixinclass object
::method init_windowBase external "LIBRARY oodialog wb_init_windowBase"
::attribute hwnd get external "LIBRARY oodialog wb_getHwnd"

::class 'DialogControl' public inherit WindowBase WindowExtensions

I expected that a CSELF in a DialogControl method would find the CSELF
I set in WindowBase, as long as I did not set a CSELF in
DialogControl.  Which is what we want, and does work that way.

> I suspect this really should have been defined by starting with the
> scope of the current method and searching back along that inheritance
> chain instead.  I would hesitate to call this a bug, but it is
> something we could add to trunk for the next release.  It really is
> bad for a mixin class to see a CSELF value for anything other than
> scopes along its own inheritance chain.

Now, if I add a CSELF to DialogControl, I expected my WindowBase code
to still pick up the WindowBase CSELF and the DialogControl code to
pick up the DialogControl CSELF.

We don't have to call it a bug, <grin>, but it does seem like a good
thing to change in trunk for the next release.

--
Mark Miesfeld