I have this macro:

#define DO_SOMETHING(N, a,b,c,...)

my goal is to write such macro that expands to:

DO_SOMETHING(1, a,b,c,...) DO_SOMETHING(2, a,b,c,...) DO_SOMETHING(3, a,b,c,...)

Here’s my approach:

#define REP_3(D, A) D(1, A) D(2, A) D(3, A) 
#define GENERATE(a,b,c, ...) REP_3(DO_SOMETHING, (a,b,c,__VA_ARGS__))

however, this expands to:

DO_SOMETHING(1, (a,b,c,...)) DO_SOMETHING(2, (a,b,c,...)) DO_SOMETHING(3, (a,b,c,...))

Perhaps, I need something like:

REP_3(DO_SOMETHING2, (a,b,c,__VA_ARGS__))
#define DO_SOMETHING2(N, A) DO_SOMETHING(N, unroll(A)) //??

How can I unroll that list of args represented by A?