I've been having some unexpected results trying to compile code using
Objective-C's Dot Syntax. I realize that this may be due to an
important question that I didn't find the answer to when I read about
Objective-C 2.0 Properties is: Can you use the dot syntax for
"regular" messages that take 0 arguments?
To test, I did this:
NSURL* urlIn = [NSURL fileURLWithPath:@"/Hello/World.txt"] ;
NSSet* set = [NSSet setWithObjects:urlIn, nil] ;
And now I want to access those values:
NSString* path ;
NSURL* url ;
And I find that this works:
url = set.anyObject ;
path = url.path ;
So, it looks like the dot syntax is OK with regular messages that take
0 arguments.
But then, either of these do not compile:
path = set.anyObject.path ;
path = (set.anyObject).path ;
In either case,
error: request for member 'path' in something not a structure or
union
Then why did it work fine when in url.path by itself?
Is this limitation in the Objective-C language, or is it in the
current gcc/Xcode 3.1 version which I am using?
Regarding gcc, certainly that error message should be updated to say
"...in something not a structure or union, nor a property".
And Xcode doesn't line up my colons when I paste in a multi-line
statement with mix dot syntax and square-brackets mixed. (Please view
in monospaced font):
NSMutableDictionary* dic = [NSMutableDictionary dictionary] ;
NSSet* set = [NSSet setWithObject:dic] ;
[set.anyObject setObject:@"parrot"
forKey:@"bird"] ;
NSLog([set.anyObject objectForKey:@"bird"]) ;
The above compiles and runs as expected, logging "parrot". But the
third and fourth lines are ugly. Xcode should line up the colons like
this:
[set.anyObject setObject:@"parrot"
forKey:@"bird"] ;
And, of course, this is definitely an issue with Xcode because it does
the same thing even if, instead of set.anyObject, I use foo.bar where
'bar' is declared with @property.
Does anyone know exactly what the rules are here?
Jerry Krinock
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