Re: crash in outlineView:isGroupItem:
Re: crash in outlineView:isGroupItem:
- Subject: Re: crash in outlineView:isGroupItem:
- From: "Joan Lluch (casa)" <email@hidden>
- Date: Sun, 8 Jun 2008 23:04:05 +0200
El 08/06/2008, a las 22:11, Kyle Sluder escribió:
On Sun, Jun 8, 2008 at 1:37 PM, Joan Lluch (casa) <email@hidden>
wrote:
return ( item && [[item representedObject] isKindOfClass:[GroupNode
class]] ) ;
Style note: you don't need to do this. [[item representedObject]
isKindOfClass:[GroupNode class]] will work just fine, because messages
to nil return zero or their logical equivalent. So if item == nil,
then [item representedObject] == nil, which means that [[item
representedObject] isKindOfClass:[GroupNode class]] == NO.
Of course, this all works only if the GroupNode class exists. ;-)
--Kyle Sluder
Yes, of course, objective-C allows you to send messages to nil but
coming from a c++ background I just am used to do check for nullity
first. On the other hand, checking an object for nil in an early stage
will in some cases give a performance improvement. Not in the above
code, obviously. :)_______________________________________________
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