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From: eps@toaster.SFSU.EDU (Eric P. Scott)
Newsgroups: comp.sys.next
Subject: How do I sort a list?
Summary: It's late, I'm tired, and this is probably a stupid question
Keywords: ObjC,AppKit
Message-ID: <1645@toaster.SFSU.EDU>
Date: 3 Jun 91 09:19:24 GMT
Article-I.D.: toaster.1645
Reply-To: eps@cs.SFSU.EDU (Eric P. Scott)
Organization: San Francisco State University
Lines: 44

Assume I have a list of objects, and I want to sort them
according to some arbitrary criteria.  As far as I can tell, the
least unpleasant approach is to subclass List and use poseAs:
to add a sort method:

--- SortableList.h
| #import <objc/List.h>
|
| @interface SortableList:List
| {
| }
|
| - sortUsing:(int (*)(const void *, const void *))compar;
|
| @end
---
--- SortableList.m
| #import "SortableList.h"
| #import <stdlib.h>
|
| @implementation SortableList
|
| - sortUsing:(int (*)(const void *, const void *))compar
| {
|     if (numElements>1) (void)qsort((void *)dataPtr, numElements,
|         sizeof (id), compar);
|     return self;
| }
|
|
| @end
---

(Where do I invoke the poseAs:?  appDidInit:?)

Now suppose my list of objects is the cellList of a one-
dimensional matrix.  Does that change things, and if so, how?
What if one or more cells are selected before I perform the sort?

What if the matrix is an argument to browser:fillMatrix:inColumn:?

Am I missing something obvious?  (i.e. is there a better way?)

					-=EPS=-