Re: [Caml-list] Map + Set

[Brian Hurt <bhurt@spnz.org>]

On Sun, 25 Jul 2004, Martin Jambon wrote:

> Hi,
> 
> I need a functional data structure that has a decent efficiency (i.e.
> not lists) and can represent `sets of named containers' so that I can
> find a container in a set, remove it from the set, update it and put it
> back into the set.
> Normally the Map module should be suitable, but it doesn't
> provide set operations over the keys (union, inter, diff, ...).
> The Set module is almost enough except that it doesn't provide a find
> function:
> 
> val find : elt -> t -> elt  (* yes! *)

A better interface might be:

val find: (elt -> int) -> t -> elt

There is a lot of functionality I'd like to be able to add to map and set.  
I find myself reimplementing them on a regular basis myself (and no, I
haven't thought of a better solution).  Many people on this list don't
like modules, however.


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Brian

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