[Development] implicit sharing and iterators in qt containers

[Mandeep Sandhu]

>
>
> Your OrderedMap should itself be implicitly shared and clone the linked
> list
> on detach.
>

Right now, I'm detaching the linked list during copy-construction (and
assignment). Detaching here means re-populating the LL with same entries
and then storing the new LL iterator's in the hash.

For implicit sharing, I'll have to this instead when a non-const function
is called for the first time on the copy. This will cause a penalty when
calling such a function as the hash has to be repopulated with all entries
(eg: calling remove on the copy will take linear time instead of constant,
although subsequent calls will have no penalty). Still thinking about it.

Thanks for your input.

-mandeep



>         Kevin Kofler
>
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