fast enumeration for array containing different types of objects

Question

If I have an NSMutableArray where I added objects of different classes (e.g. NSString, NSMutableString, NSProcessInfo, NSURL, NSMutableDictionary etc.) Now I want to fast enumerate this array, so I tried:

for (id *element in mutableArray){
   NSLog (@"Class Name: %@", [element class]);
   //do something else
}

I am getting a warning in Xcode saying

warning: invalid receiver type "id*"

How can I avoid this warning?

pgb · Accepted Answer · 2009-08-12 12:12:04Z

11

The code is almost correct. When you use id, it's already implied to be a pointer, so you should write it as:

for (id element in mutableArray){
   NSLog (@"Class Name: %@", [element class]);
   //do something else
}

answered Aug 12, 2009 at 12:12

pgb

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3 Comments

Dave DeLong Over a year ago

and you'd also probably want [element className] and not [element class].

Dev Over a year ago

well class is also printing out the name correctly, however className makes more sense while reading the code ... thanks for the tip!

kperryua Over a year ago

Actually, -className is not meant for this purpose. That method is meant for scripting integration in Cocoa. -[Class description] should provide the correct result, but if you want to be pedantic, NSStringFromClass([element class]) is more correct

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