On Fri, 27 Aug 2010, Nicolas Cellier wrote:
2010/8/27 Levente Uzonyi <[email protected]>:
On Thu, 26 Aug 2010, Lukas Renggli wrote:
I wonder why there is the need for a stack class at all?
OrderedCollection is the class designed to do Stacks and Queues
efficiently and portably, see #addFirst:, #addLast:, #first, #last,
#removeFirst, #removeLast.
If so, then there are some problems:
o := OrderedCollection new: 1000.
1 to: 1000 do: [ :each | o add: each ].
[ 100000 timesRepeat: [ o addFirst: o removeLast ] ] timeToRun. "===> 11660"
Levente
OrderedCollection could be implemented differently, like for example
having a circular array and maintaining a firstIndex and size instead
of lastIndex.
This issue is already fixed in Squeak 4.1. I tried the OrderedCollection
with a circular array just like you suggested, but it was a bit slower
than Squeak's OrderedCollection. Also note that this is an edge case.
Levente
The main drawback would be that fast copy/replace would have to be
split in two parts.
Nicolas
Lukas
2010/8/26 Bart Gauquie <[email protected]>:
Hi list,
is there a specific reason Stack is extending from LinkedList, instead of
using a LinkedList internally?
To me, it seems that the protocol that LinkedList,
SequenceableCollection,
... provides is not the protocol you expect from a Stack?
Any thoughts on this?
Kind regards,
Bart
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Lukas Renggli
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