Re: Map, Set libraries
Serge D. Mechveliani wrote: > As Jens Fisseler notes, I have made a confusion about > > Set.elems, Set.toList, Set.setToList. There is even Set.toAscList (although one may argue that should be Set.toDistinctAscList) I think the right choice is Set.toList (replacing setToList) Is Set.elems just a (nicer?, useless?) synonym for Set.toList? There are also Map.assocs and Map.toList being synonyms. But Map.elems is different from Map.toList and Set.elems would only correspond to Map.elems for some identity maps (not for the old set implementation using maps with dummy elements "()") Cheers Christian P.S Map.insert indeed replaces existing values (and should be used instead of addToFM with changed argument position for the input map) ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Map, Set libraries
As Jens Fisseler notes, I have made a confusion about Set.elems, Set.toList, Set.setToList. Docs on setToList occurs all right (`Obsolete' item). And for some reason, Data.Set.html shows the pair > > " > > elems :: Set a -> [a] > > O(n). The elements of a set. > > > > toList :: Set a -> [a] > > O(n). Convert the set to a list elements. > > " Hm, let it be. I do not know, maybe the documentation could say why there are two of them. - Serge Mechveliani [EMAIL PROTECTED] ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Map, Set libraries
> I meant the description in the ghc-6.4 documentation. > Data.Set.html says > " > elems :: Set a -> [a] > O(n). The elements of a set. > > setToList :: Set a -> [a] > O(n). Convert the set to a list elements. > " > What is the difference? > If they are really equivalent, then, it is natural either to > remove `elems' or to follow the general GHC policy and to move > setToList to the `Obsolete' list section in documentation, like > it was done with many other functions for Set and FiniteMap. > - ? Well, seems like both of us have messed something up. The ghc-6.4 documentation for 'setToList' says "Obsolete equivalent of elems", whereas the documentation for 'toList' (that what I was referring to) says "O(n). Convert the set to a list of elements." But, by looking at the source code, one can easily see that 'setToList' if defined in terms of 'elems' setToList :: Set a -> [a] setToList = elems which in turn is defined as elems :: Set a -> [a] elems s = toList s So, both 'setToList' and 'elems' do the same, and 'setToList' is marked as obsolete, so use 'elems'. Regards, Jens ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
