Re: Crash when calling custom methods in custom subclass.

• Subject: Re: Crash when calling custom methods in custom subclass.
• From: mmalcolm crawford <email@hidden>
• Date: Sat, 30 Jul 2005 22:23:18 -0700
• Delivered-to: email@hidden
• Delivered-to: email@hidden

- (id) init
{
        [super init];
        if (self) {
                _format = [NSString string];
                _content = [NSString string];
                _answers = [NSMutableArray array];
                _isHeader = NO;
        }
        return self;
}

When I remove the setAnswers: method call, the addHeaderRow: method
completes with no problem. When the setAnswers: call included, the
entire addHeaderRow: method completes (the setAnswers: works as
expected), then I get the "EXC_BAD_ACCESS" error and the program
crashes.

- (void) setAnswers: (NSArray *)newAnswers
{
    if (newAnswers != _answers) {
        [_answers autorelease];
        _answers = [newAnswers copy];
    }
}

... so _answers receives two release messages and causes the crash.

    [self setFormat:[NSString string]];
    [self setContet:[NSString string]];
    [self setAnswers:[NSMutableArray array]];

    NSString *newString = [[NSString alloc] init];
    [self setFormat:newString];
    [newString release];

That said, premature optimisation is also a bad thing:

I can get AROUND this problem by making the array mutable, and using
addObject: calls, but I have read that Mutable Arrays create more
memory overhead and are less effecient.

mmalc

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