On 18 Apr 2008, at 05:56, Adam P Jenkins wrote:
On Apr 18, 2008, at 12:47 AM, Bill Bumgarner wrote:
On Apr 17, 2008, at 11:20 PM, Adam P Jenkins wrote:
Exactly. And now that the convention of methods returning self no
longer exists, it seems like there's no longer any advantage to
this behavior.
There are 10s of thousands invocations of methods on nil objects
during the normal, non-error-path, execution of your average Cocoa
application that indicate that this behavior is still, very much,
used to the advantage (where 'advantage == convenience') of Cocoa
programmers.
Can you give an example of where invoking methods on nil objects
would make sense in a non-error-path situation? I'm not trying to
be argumentative here, I'm really curious to know what Objective-C
idioms take advantage of the nil-swallows-messages behavior. Thank
you.
Do these count?
1.
// add user defined savepath to savepath menu
NSString * userpath = [[NSUserDefaults standardUserDefaults]
objectForKey:ZNCDRevPrefUserDefinedSavepathKey];
if (userpath) {
[savepathPopUpButton insertItemWithTitle:[[NSFileManager
defaultManager] displayNameAtPath:userpath] atIndex:2];
NSMenuItem * userDefinedMenuItem = [savepathPopUpButton itemAtIndex:2];
[userDefinedMenuItem setTag:CDRevPrefUserDefinedSaveMethod];
}
2.
- (BOOL) isPreEmphasisEnabledForSession:(int)aSession track:(int)aTrack;
{
return [[[[[[[self TOCPlist] objectForKey:ZNDiscTOCSessionsKey]
objectAtIndex:(aSession-1)]
objectForKey:ZNDiscTOCSessionTrackArrayKey] objectAtIndex:(aTrack-1)]
objectForKey:ZNDiscTOCTrackPreEmphasisEnabledFlagKey] boolValue];
}
If not nil messaging certainly makes life easier in these situations.
- Dave
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