Den 25.08.2010 12:58, skrev Bart Gauquie: > > > On Wed, Aug 25, 2010 at 10:38 AM, Henrik Johansen > <henrik.s.johan...@veloxit.no <mailto:henrik.s.johan...@veloxit.no>> > wrote: > > > > Den 24.08.2010 17:58, skrev Nicolas Cellier: > > 2010/8/24 Schwab,Wilhelm K <bsch...@anest.ufl.edu > <mailto:bsch...@anest.ufl.edu>>: > > > >> This cropped up in Dolphin some years back. IIRC, OA's answer > was that streams historically worked on only Array and maybe > something else. Having said that, they relaxed a constraint > because it was harmless and a good idea. > >> > >> I'm not sure about streaming over a set; lack of order means > that it might be tricky to maintain a reasonable position?? > >> > >> > > Exactly, the Stream would hardly be positionable, unless you use a > > sort of OrderedSet... > > A ReadWriteStream would be problematic for the same reasons. > > > > What would be the interest of such a Stream ? > > (I mean something more than what just you can do with #do:or #add:) > > > > Nicolas > +1. > I don't quite see what use could would find in a stream of a > non-sequenced source that is not better served by using a different > abstraction, or the source itself.. > > Cheers, > Henry > > _______________________________________________ > Pharo-project mailing list > Pharo-project@lists.gforge.inria.fr > <mailto:Pharo-project@lists.gforge.inria.fr> > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > > > Ok, but why can you then do a collect:[] / select:[] / do: [] over a > set? It also iterates over all the elements. So why is it then > strange to have a readstream over a set? I'm not saying it should be a > positionable stream. > > But I also agree that is more logical to only do a ReadStream over a > SequenceableCollection if you take into account positions ... Maybe > change the code so that it only accepts a SequenceableCollection? > > Haven't tried Nile yet. > > Kind Regards, > > Bart Yes they iterate of the elements, but they don't really care about which. sequence the elements are in. Sure you can write a block to pass to them which does, but I doubt you'd want to use that with a Set or a Dictionary. #next, #nextPut:, #upTo: and the rest of the Stream protocol certainly do care what sequence the elements are in.
Cheers, Henry
_______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
