On Sat, 20 Feb 2016, Michalis Kamburelis wrote:
Can you send little bit sample showing this degradation? I can inform him
to not send the patch because this problem. (I think that him isn't
registered here in the list yet)
There's no need for a sample. This degradation is the whole reason why the
non-generic classes TFPObjectList and TFPList exist compared to TObjectList
and TList which do have notifications.
Hm, two points.
1. I'm using FGL containers a lot (because I like type-safety given by
generics), and I agree that adding a notification mechanism there can
slow them down. Mostly at allocation (because a deallocation is
already burdened down by having to do Deref() on every item, so it
would probably not suffer *so much* with unassigned OnNotify).
2. But this should not stop us from making a "generic container with
notification" classes. Maybe as new classes, maybe as a boolean toggle
to existing classes (as Graeme nicely suggests).
Right now we only have "with notifications, and not type-safe"
containers (TObjectList/TList) and "without notifications, and
type-safe using generics" containers (TFPObjectList/TFPList).
These latter 2 are not generics based. There was some experimental code
which attempted to implement TFPObjectList/TFPList on top of generics,
but they were slower than the native implementation. That experiment is
unmaintained.
TFPGList is the one you meant, probably.
Michael.
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