Hi Wolfgang,
nice to read you.
Wolfgang Lux wrote:
Come on Riccardo, before accusing Apple of lying, you should better check the
facts first.:-)
well.. I checked what the code does when "compiled" not only the
documentation.
on 10.13 XCode indeed has:
+ (NSMutableCharacterSet
<apple-reference-documentation://hcbtoad_se>*)characterSetWithCharactersInString:(NSString
<apple-reference-documentation://hcdPnFRdoM>*)aString;
in the documentation box, so as you suppose, perhaps they just
subclassed and implemented it.
If you use any of the character set class methods, Xcode says that they return
a NSCharacterSet *, which is what you’d expect. It‘s only when you use them for
NSMutableCharacterSet that Xcode says that they return a NSMutableCharacterSet
*. And that is correct as well, as a quick look at either the online
documentation for class NSMutableCharacterSet or at the header NSCharacterSet.h
in any recent version of the OS would have revealed: Apple simply has chosen to
redeclare (and likely reimplement) all of the class methods In
NSMutableCharacterSet to return a NSMutableCharacterSet.
I think I got confused by the class being NSCFCharacterSet
Execution of this code:
NSMutableCharacterSet *cs;
cs = [NSMutableCharacterSet characterSetWithCharactersInString:@"a"];
NSLog(@"class of cs %@ is %@", cs, NSStringFromClass([cs class]));
if ([cs isKindOfClass:[NSCharacterSet class]])
NSLog(@"is NSCharacterSet");
if ([cs isKindOfClass:[NSMutableCharacterSet class]])
NSLog(@"is NSMutableCharacterSet");
yields this:
2025-07-22 13:21:52.461091+0200 CSTest[606:9532] class of cs
<__NSCFCharacterSet: 0x1020049b0> is __NSCFCharacterSet
2025-07-22 13:21:52.461141+0200 CSTest[606:9532] is NSCharacterSet
2025-07-22 13:21:52.461165+0200 CSTest[606:9532] is NSMutableCharacterSet
so... it is a NSMutableCharacterSet
and it also means I need to redo the test on 10.4, I got confused by the
class name __NSCFCharacterSet
Riccardo
