[fpc-devel] type discussion

Hans-Peter Diettrich DrDiettrich at compuserve.de
Sun Jun 5 10:53:27 CEST 2005

Danny Milosavljevic wrote:

> > > > Garbage collection is largely no issue when using the Owner concept in TComponent, using TObjectList, etc.
> > >
> > > True and thats why I suggested ref counting Tobjects only so that no
> > > manual memory management is required. I tend to make heavy use of TList,
> > > Tstringlist and TFilestream objects so I cant do everything with
> > > tcomponents alas.
> I'd suggest creating tlist, tstringlist, tfilestream-like things with an
> optional owner (TComponent-like). I've been programming delphi for
> years, and trust me, I know how annoying keeping track of tlist memory
> is (and I mean _annoying like *@! hell_ :)). Of course having to cast
> around list content is even more annoying. But 'm trying to fix that
> now, in fpc.

I've implemented such classes years ago, and according list and tree
view controls for easy display. The classes are derived from TStrings,
widely compatible with the remainder of the VCL. I also use
bidirectional member/owner links, so that a destroyed member can inform
it's owner appropriately, and the display and navigation in trees
requires no further stacks or treeview structures. In fact it's
sufficient to pass a reference to some existing TStrings structure to my
controls, then that structure is displayed automagically, without the
need for hidden copies or other crap, as occurs with the traditional


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