• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Re: What to use observeValueForKeyPath: context
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: What to use observeValueForKeyPath: context


  • Subject: Re: What to use observeValueForKeyPath: context
  • From: Chris Kane <email@hidden>
  • Date: Fri, 29 Aug 2008 16:16:12 -0700

On Aug 29, 2008, at 10:23, j o a r wrote:
If you use a constant string, you should make sure that the
string *contents* are unique, in order to ensure uniqueness of the
pointer to it. So don't call it @"context", use @"MyFunkyClass KVO
observer context". After all there's no penalty for being verbose in
this case. Of course using a pointer to a global solves this too.


The penalty for using constant strings is that they will end up wasting space in your binary...
Rons suggestion is probably optimal.


Even more optimal than...

static NSString *ABCFooPropertyObservingContext;

is this:

static char ABCFooPropertyObservingContext;

and then still using &ABCFooPropertyObservingContext as the context value. If nothing ends up being packed up tight right after that char, due to data alignment, well then you still haven't lost anything.


Chris Kane Cocoa Frameworks, Apple


_______________________________________________

Cocoa-dev mailing list (email@hidden)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden


References: 
 >What to use observeValueForKeyPath: context (From: Dave Dribin <email@hidden>)
 >Re: What to use observeValueForKeyPath: context (From: "Michael Ash" <email@hidden>)
 >Re: What to use observeValueForKeyPath: context (From: Dave Dribin <email@hidden>)
 >Re: What to use observeValueForKeyPath: context (From: "Michael Ash" <email@hidden>)
 >Re: What to use observeValueForKeyPath: context (From: j o a r <email@hidden>)

  • Prev by Date: Re: Connecting NSToolbar and NSTabView
  • Next by Date: Target change problem
  • Previous by thread: Re: What to use observeValueForKeyPath: context
  • Next by thread: Re: What to use observeValueForKeyPath: context
  • Index(es):
    • Date
    • Thread