Re: Simple question: Why does this work?
Re: Simple question: Why does this work?
- Subject: Re: Simple question: Why does this work?
- From: Andreas Mayer <email@hidden>
- Date: Thu, 21 Aug 2003 00:56:52 +0200
Am Donnerstag, 21.08.03 um 00:22 Uhr schrieb Nick Zitzmann:
NSMutableAttributedString* theString = [[[NSMutableAttributedString
alloc] init] autorelease];
[theString setString:@"Hello"];
[theString appendString:@"."];
// pass the theString off to be displayed ...
Why does this work? According to the docs, the setString: and
appendString: methods are instance methods for NSMutableString and I
should have to write:
It works because NSMutableAttributedString is a subclass of
NSAttributedString. So it inherits everything from
NSAttributedString...
Um. setString: and appendString: are not declared for
NSAttributedString either.
That's the reason _I_ get compiler warnings when trying to compile that:
MainWindowController.m:19: warning: `NSMutableAttributedString' does
not respond to `setString:'
MainWindowController.m:20: warning: `NSMutableAttributedString' does
not respond to `appendString:'
And runtime errors too:
2003-08-21 00:51:09.385 StringTest[2038] ***
-[NSConcreteMutableAttributedString setString:]: selector not recognized
2003-08-21 00:51:09.386 StringTest[2038] An uncaught exception was
raised
2003-08-21 00:51:09.386 StringTest[2038] ***
-[NSConcreteMutableAttributedString setString:]: selector not recognized
2003-08-21 00:51:09.386 StringTest[2038] *** Uncaught exception:
<NSInvalidArgumentException> *** -[NSConcreteMutableAttributedString
setString:]: selector not recognized
I'm using GCC 3.1 on Jaguar.
So maybe a bug in GCC 3.3 or an extension to the libraries for Panther?
bye. Andreas.
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