On Dec 1, 2007, at 5:15 PM, Christiaan Hofman wrote:
> BTW, I was wondering about a compiler issue: what object do the ivars
> actually belong to, is it the receiver of the method, or the current
> value of self? So if I do:
>
> receiver = self;
> self = replacement;
> myIvar;
>
> Is myIvar now equivalent to receiver->myIvar or replacement->myIvar?
> This would be relevant in this case if super's init could replace the
> object, because it may make assigning ivare before [super init]
> unreliable.
That's a good question. Practically, it looks like that will only be
a problem if -[BDSKAsynchronousDOServer init] returns something other
than self, and we can guarantee that it won't do that.
I wrote a test program to play with this idea. There's some magic
that happens with ivar pointers here that I do not understand.
#import <Foundation/Foundation.h>
@interface StringSubclass1 : NSString
@end
@implementation StringSubclass1
- (id)init
{
[self release];
return (id)CFStringCreateCopy(NULL, CFSTR("CFString test"));
return [NSObject new];
}
@end
@interface StringSubclass : StringSubclass1
{
NSString *string;
}
@end
@implementation StringSubclass
- (id)init
{
string = [@"Test" copy];
id originalSelf = self;
NSLog(@"original self is %@ (%p)", originalSelf->isa,
originalSelf);
NSLog(@"string is %p", string);
self = [super init];
NSLog(@"original self is %@ (%p)", originalSelf->isa,
originalSelf);
NSLog(@"self is %@ (%p)", self->isa, self);
NSLog(@"string is %p", self->string);
return self;
}
- (unsigned)length { return [string length]; }
- (unichar)characterAtIndex:(unsigned)idx { return [string
characterAtIndex:idx]; }
- (void)dealloc
{
NSLog(@"dealloc StringSubclass %@, releasing string %@", self,
string);
//[string release];
//[super dealloc];
}
@end
int main (int argc, char const *argv[])
{
NSAutoreleasePool *pool = [NSAutoreleasePool new];
StringSubclass *c = [[StringSubclass alloc] init];
[c release];
[pool release];
return 0;
}
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