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Alex Rivera
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I realize that this is similar to an existing post here, What's the Point of (NSError**)error? , but my question is a little different. I understand how the double pointer works, and how this is the common iOS API error pattern. My question is more around the single pointer, and why this code doesn't work: - (BOOL)someMethodWithError:(NSError *)error { ... if( errorOccured ) { NSError *e = [[[NSError alloc] initWithDomain:@"" code:1 userInfo:nil] autorelease]; error = e; return NO; } return YES; } implemented using: NSError *error = nil; if( ![someObj someMethodWithError:error] ) { NSLog(@"Error: %@", [error localizedDescription]); } Why doesn't the assignment in the method implementation reassign the pointer to the new NSError object?
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