How can I generate a list via the C preprocessor (cpp)?

Question

I would like to do something like the following:

F_BEGIN

F(f1) {some code}
F(f2) {some code}
...
F(fn) {some code}

F_END

and have it gene

Answer 1

This is sort of abuse of CPP but a common type of abuse. I handle situations like this by defining dummy macros

#define FUNCTIONS \
 foo(a,b,c,d) \
 foo(a,b,c,d) \
 foo(a,b,c,d)

now, 

#define foo(a,b,c,d) \
 a+b ;

FUNCTIONS

#undef foo

later, when you want something different done with the same list

#define foo(a,b,c,d) \
 a: c+d ;

FUNCTIONS

#undef foo

It's a bit ugly and cumbersome, but it works.