[fpc-devel] Proof of Concept ARC implementation

[Sven Barth]

Am 27.10.2014 21:00, schrieb Hans-Peter Diettrich:
> Sven Barth schrieb:
>> Am 27.10.2014 17:20 schrieb "Hans-Peter Diettrich" 
>> <DrDiettrich1 at aol.com <mailto:DrDiettrich1 at aol.com>>:
>
>>  > Something like ShortString and AnsiString?
>>
>> With the difference that Short- and AnsiString are assignable to 
>> eachother while Jonas does not want that for reference counted and 
>> ordinary classes.
>
> Where would this matter? When TObject and TManagedObject are different 
> (base) types, a direct assignment of references is impossible.
Take unit Typinfo for example where quite some methods take a TObject 
instance. Or all those classes (TStrings, TObjectList, TComponent, etc.) 
that somewhere take a TObject as parameter.
>
>> What do you mean with "virtual counting methods"?
>
> Overriding these methods can enable/disable refcounting for a class, 
> and all classes derived from it. The default then can be to do nothing 
> (no counting).
But then it's the same reference counting as the COM one, because 
without the COM reference counting those virtual methods would not be 
called.
>> The main reason I decided not to introduce reference counting for 
>> every class was that some people feared the performance impact of the 
>> reference counting. Though Florian said that it shouldn't be that bad 
>> on today's CPUs...
>
> Did you ever benchmark your model?
Nope. Was glad to have gotten it out to the public with all those 
distractions I have in my free time ;)

Regards,
Sven