Class-level objectForKeyedSubscript:

Question

I get an error when I use objectForKeyedSubscript: as a class level method, so in my class "MyExample.h/.m" I have something like the following:

+ (id)objectForKeyedSubscript:(NSString*)key;

and I want to do MyExample[@"key"], I initialize a static dictionary in a class method.

Are objectForKeyedSubscript: and the brackets meant to only be used with objects? Is there an alternative way to do it on a class level?