Le 25 janv. 09 à 14:50, João Varela a écrit :
Olá António I think your method must be corrected like this: On 2009/01/25, at 07:28, cocoa-dev-requ...@lists.apple.com wrote:@implementation PDFDocument (PDFDocument_Alloc) + (id)replacementAllocWithZone:(NSZone *)zone { if ([self class] == [PDFDocument class]) { return [ANPDFDocument replacementAllocWithZone:zone]; } else { return [super allocWithZone:zone]; } }Note that you have to invoke the class method of self in order to compare it properly. Otherwise you are comparing a pointer to a class and the class name, which is the same as comparing apples with oranges. For further information read the introspection chapter in the Cocoa Fundamentals Guide:
'self' is a Class object as it's a class method, and +[NSObject Class] also return a Class (and not a class name).
I don't understand the issues and saw nothing about it in the link you provide.
http://developer.apple.com/DOCUMENTATION/Cocoa/Conceptual/CocoaFundamentals/CocoaObjects/chapter_3_section_7.html
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