Re: [Caml-list] Map + Set

[Brian Hurt <bhurt@spnz.org>]

On Mon, 26 Jul 2004, Martin Jambon wrote:

> > > > val find: (elt -> int) -> t -> elt
>                 ^^^^^^^^^^^^
> This is a little unsafe, isn't it? What if you don't respect the ordering
> of your set?

Then the function throws Not_found when it shouldn't.

If you already have the object you're looking for, why are you looking for 
it?  Either that or you're using a set to really implement a map- use a 
map instead.

> I think Brian and Matthieu are talking about 2 different things:
> (1) Martin and Brian were talking of an O(log n) find just like mem.
> (2) Matthieu and others are talking of a search using an
> arbitrary predicate just like List.find, in O(n) steps.
> 

What's the advantage of doing the search in O(n) time when you can do it 
in O(log n) time?

A function that finds *all* elements that fit a certain criteria I can 
understand- but that's pretty easy to implement with fold.

-- 
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                                - Gene Spafford 
Brian

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