Question

Is it possible to define a macro called IPHONE_ONLY for conditional compilation that looks like this:

IPHONE_ONLY -(void)myMethod {
    //method body
}

or

IPHONE_ONLY( -(void)myMethod {
    //method body
})

Answer 1

Even though normally you would surround the function with #ifdef, I tested with gcc and indeed the following also works. I don’t know if it is standard:

#ifdef IPHONE
# define IPHONE_ONLY(...) __VA_ARGS__
#else
# define IPHONE_ONLY(...)
#endif

IPHONE_ONLY(int func(void)
{
    return 12;
})

I have never seen anyone code like that though. It is quite common to write such a function like this:

#ifdef IPHONE
int func(void)
{
    return 12;
}
#endif

Your editor also would be much happier with this, since it understands functions, but not function body used as a macro parameter!