Question

I was looking at enums in cocoa frameworks and I saw this:

enum {  
    NSNetServiceNoAutoRename = 1UL << 0  
}; 

typedef NSUInteger NSNetServiceOptions;

and my question is how is this possible?

How is NSNetServiceOptions tied to that enum?

And is it only possible in objective c or also in c?

Answer 1

NSNetServiceOptions tied to that enum in the context that the enum is going to hold an integer value anyway. In the above example you will create a variable for the enum as,

NSNetServiceOptions _netServiceOptions;

You can even ignore the typedef and directly use,

NSUIInteger _netServiceOptions;