objective c - How to treat NSArray of mixed content as of unified content? -

class b derived class a. class b overrides '- (nsstring *) description', overridden in class too. made new 'nsarray' of pointers instances, both class , class b.

is possible treat of them in cycle class instances, more precisely - possible use class '- (nsstring *) description' of them?

currently, use check if it's class b instance, , call initializer makes class instance in case. seems unnecessary, don't solution.

the following example may little easier on eyes solution in other thread mentioned in merlevede's answer.

for ( id item in array ) {     if ( [item ismemberofclass:[classa class]] )     {         nslog( @"%@", item );     }     else     {         struct objc_super parent = { item, [item superclass] };         nslog( @"%@", objc_msgsendsuper( &parent, @selector(description) ) );     } } 

the objc_msgsendsuper function can used call method returns id

edit - forgot mention need

#import <objc/message.h> 

edit 2 - based on feedback op in comments, here ultimate solution

for ( id item in array ) {     struct objc_super baseclass = { item, [classa class] };     nslog( @"%@", objc_msgsendsuper( &baseclass, @selector(description) ) ); }