NetNews Usenet Archive 1993 #1/NN_1993_1.iso/spool/comp/lang/function/1484

Text File | 1993-01-05 | 1.6 KB | 41 lines

Newsgroups: comp.lang.functional
Path: sparky!uunet!newsflash.concordia.ca!nstn.ns.ca!cs.dal.ca!ug.cs.dal.ca!ssmith
From: [e-mail] (Susan E Smith)
Subject: Length of Arrays in SML
Message-ID: <[e-mail]>
Sender: [e-mail] (USENET News)
Nntp-Posting-Host: ug2.cs.dal.ca
Organization: Math, Stats & CS, Dalhousie University, Halifax, NS, Canada
Date: Tue, 5 Jan 1993 19:49:12 GMT
Lines: 29

PROBLEM:  I am using Standard ML (New Jersey), Version 0.66 and I am trying
to use the Array function "length" to get the length of an array.  I have
defined my array using arrayoflist:

    eg.    val My_Array = arrayoflist ["Hi","My","Name","Is","Bob"];

    Now I want to use "length My_Array" to return the integer 5.

The reference manual I am using, says that this can be done and that the
function length is one that takes an array and returns an int.

However, this gives me an error when I try it in my version of SML and when
I type "length;" it tells me that length accepts a list and returns an int,

    eg.    length My_List;  returns the length of the list, My_List.

    I have tested this and this is the case.

The discrepancy between my reference manual and my version of SML is not the
major concern here, what I really want to know is:  Is there a way to get
the length of an array in the version of SML I am using.  This is important
to my application because I have a statement that says My_Array sub i where
i is begin incremented; hence, once i is out of range for the array, I don't
want the function to continue executing.

Any help would be greatly appreciated.

Susan
[e-mail]