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:
http://developer.apple.com/DOCUMENTATION/Cocoa/Conceptual/CocoaFundamentals/CocoaObjects/chapter_3_section_7.html
HTH
Joao Varela
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