Hello,
While experimenting with distributed objects, I noticed that the count method can be
called on an id but I cannot just call any arbitrary method on id (e.g., a made-up
"countx" method).
Why doesn't calling count on an id generate a compiler
warning/error-when-using-ARC?
It seems the count method is accorded some special status compared to an arbitrary method
like "countx"... how does this work?
Code example including the somehow-working [id count] (but erroring other
cases, as expected) are shown below.
Thank you,
Patryk
#import <Foundation/Foundation.h>
int main() {
id one = [[NSObject alloc] init];
NSObject* two = [[NSObject alloc] init];
[one count];
[one countx];
[two count];
[two countx];
return 0;
}
When compiled with ARC:
blessed_methods.m:9:10: warning: instance method '-countx' not found (return
type defaults to 'id'); did you mean
'-count'? [-Wobjc-method-access]
[one countx];
^~~~~~
count
blessed_methods.m:10:10: warning: 'NSObject' may not respond to 'count'
[two count];
~~~ ^
blessed_methods.m:11:10: warning: instance method '-countx' not found (return
type defaults to 'id')
[-Wobjc-method-access]
[two countx];
^~~~~~
_______________________________________________
Discuss-gnustep mailing list
[email protected]
https://lists.gnu.org/mailman/listinfo/discuss-gnustep
