[fpc-devel] Suggestion: reference counted objects

Hans-Peter Diettrich DrDiettrich1 at aol.com
Mon Sep 22 11:04:35 CEST 2014

Sven Barth schrieb:
> On 21.09.2014 21:09, Hans-Peter Diettrich wrote:
>> Sven Barth schrieb:
>> I'd add a _RefCount field to TObject, regardless of whether it's really
>> used later; this will fix the field offset - just like the VMT reference
>> is fixed in TObject, but not in Object types. This will eliminate
>> problems with class helpers.
> I've especially written that it's not part of *every* objects, because 
> people complained about the size increase for all instances.

That's why I also suggested an compiler option, useful for all people 
which care about program size or ARC at all.

In general I agree with your thoughts, I only wanted to add a few remarks.

>> Here the compiler would always insert _AddRef, just like with
>> interfaces, eventually optimized (inlined?) like:
>>    if Result._RefCounter <> -1 then
>>      Result._AddRef; //or InterlockedIncrement(Result._RefCounter);
> And that's another thing: people complained about having that reference 
> count overhead for *all* assignments.

See above :-)

> It. Was. Just. An. Example. To. Illustrate. The. Problem!
> I would implement that differently as well, but there's *no* point to do 
> that inside an example that's supposed to be as simple as possible!

Is it me, or what else makes you so angry today?
Sorry for that :-(


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