Why won't this compile and how can it be implemented so that it does?

Question

Here is some C++ code I\'m playing around with:

#include 
#include 

#define IN ,
#define FOREACH(x,y) for(unsigned int i=0;i&l         


        

Answer 1

The preprocessor doesn't expand the IN to a comma until after it reads the arguments to FOREACH.

I'm pretty sure that the c++ preprocessor is one pass only, so you'll have to use:

FOREACH(int item, ints)
    cout << item;
ENDFOREACH