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Re: About iVars declaration and property
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Re: About iVars declaration and property


  • Subject: Re: About iVars declaration and property
  • From: David Duncan <email@hidden>
  • Date: Tue, 15 Nov 2011 10:37:00 -0800

On Nov 15, 2011, at 10:34 AM, Torsten Curdt wrote:

>> No it can't. @property only says "I have methods named -foo and -setFoo:". It implies absolutely nothing about storage.
>
> How does
>
> @property (nonatomic, assign) IBOutlet NSWindow *window;
>
> not have the information that there would need to be an ivar
>
> NSWindow *window;
>
> on 32-bit?


Because you could implement this property by doing something like this:

- (NSWindow *)window
{
	return [_internalDictionary objectForKey:@"window"];
}

- (void)setWindow:(NSWindow *)window
{
	[_internalDictionary setObject:window forKey:@"window"];
}

And thus not increase the size of the object at all (i.e. all properties could in theory be entries in a _internalDictionary if the class decided to).

Properties are only interfaces.
--
David Duncan

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References: 
 >Re: About iVars declaration and property (From: Matt Neuburg <email@hidden>)
 >Re: About iVars declaration and property (From: Torsten Curdt <email@hidden>)
 >Re: About iVars declaration and property (From: glenn andreas <email@hidden>)
 >Re: About iVars declaration and property (From: Torsten Curdt <email@hidden>)
 >Re: About iVars declaration and property (From: Kyle Sluder <email@hidden>)
 >Re: About iVars declaration and property (From: Torsten Curdt <email@hidden>)
 >Re: About iVars declaration and property (From: Kyle Sluder <email@hidden>)
 >Re: About iVars declaration and property (From: Torsten Curdt <email@hidden>)

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