Re: Why does this leak memory?
Re: Why does this leak memory?
- Subject: Re: Why does this leak memory?
- From: Bob Ippolito <email@hidden>
- Date: Mon, 11 Jul 2005 13:12:24 -1000
On Jul 11, 2005, at 1:08 PM, Bob Ippolito wrote:
On Jul 11, 2005, at 5:51 AM, glenn andreas wrote:
On Jul 11, 2005, at 10:40 AM, Matt Ball wrote:
Interface:
#import <Cocoa/Cocoa.h>
@interface LayerCell : NSTextFieldCell
{
NSImage *image;
}
- (NSImage *)image;
@end
Implementation of NSCopying:
- (id)copyWithZone:(NSZone *)zone
{
NSCell *copy = [[[self class] alloc] init];
return copy;
}
This does not implement copy correctly - the results are a new
object that doesn't have an image, so it's not a copy of the
original.
You'll need to do something more like:
- (id)copyWithZone:(NSZone *)zone
{
LayerCell *copy = [[[self class] alloc] init];
[copy setImage: [self image]];
return copy;
}
I'm pretty sure you want to be calling the super implementation of
copyWithZone:, but then you have another problem (probably,
anyway). See here:
http://www.mulle-kybernetik.com/weblog/archives/000472.html
And of course, reading the official documentation that tells you how
to correctly implement NSCopying indispensable:
http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/
Tasks/ImplementCopy.html
-bob
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