What is wrong with this Macro?

Question

#define mySynthesize(op) @synthesize op = _op;

So rather than typing

@synthesize someVar=_someVar;
@synthesize otherVar=_otherVar;
         


        

Answer 1

When you prefix the op with an underscore, the preprocessor treats it as a different token, so it doesn't get replaced. You need to use ## to concatenate the underscore to the front so that the replacement occurs first.

#define mySynthesize(op) @synthesize op = _ ## op