NetNews Usenet Archive 1992 #16/NN_1992_16.iso/spool/comp/sys/next/programm/5224

Internet Message Format | 1992-07-25 | 1.6 KB

Path: sparky!uunet!dtix!darwin.sura.net!jvnc.net!mitl.com!news
From: [e-mail] (Ed Lau)
Newsgroups: comp.sys.next.programmer
Subject: freeing an object--when?
Message-ID: <[e-mail]>
Date: 24 Jul 92 18:05:35 GMT
Sender: [e-mail]
Distribution: na
Organization: Matsushita Information Technology Laboratory
Lines: 42
Nntp-Posting-Host: chaos.mitl.com



I am writing an application that loads a document from a file and displays it
in a window. My app has a controller object and document objects. Both
controller and document are instances of Object subclasses. Each document
instance has an outlet to its respective window and is the delegate for that
window.

Here's my problem: I want to free my document object when the user closes its
respective window. To do this, I have the following code in my windowWillClose:
method in Document.m:

- windowWillClose:sender
{
    [controller rmDoc:self];

    ...
}

in my -rmDoc method in Controller.m, I do:

- rmDoc:aDoc
{
    // docList is a List containing my document objects
    [[docList removeObject:aDoc] free];

    ...
}

However, since my document object is freed, its window is left without a
delegate. What to do?

I suppose I can have the controller be each window's delegate, but I prefer to
have each document be the delegate instead. The reason is mainly because each
window may have different max and min sizes--information the document instance
knows about.

What are possible solutions to this problem? Any suggestions appreciated. Thank
you in advance.

--Edward Lau
[e-mail]