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[Caml-list] List.sort
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Date: 2002-06-19 (15:15)
From: Stefano Zacchiroli <zack@c...>
Subject: Re: [Caml-list] List.sort
On Wed, Jun 19, 2002 at 10:54:54AM +0200, Johann Spies wrote:
> I am trying to figure out how to use List.sort.

Look at the List.sort type:

  ('a -> 'a -> int) -> 'a list -> 'a list

the first "argument" required by List.sort have type "function that
takes two arguments of the same type and return an int".
The type of compare is:

  'a -> 'a -> int

you then have to pass the function compare itself without applying it
(as I saw in one of your example).
This is a sample usage:

  List.sort compare [3;2;1]

Indeed "List.sort compare" have type

  'a list -> 'a list


Stefano Zacchiroli - undergraduate student of CS @ Univ. Bologna, Italy
zack@cs.unibo.it | ICQ# 33538863 | http://www.cs.unibo.it/~zacchiro
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