How can I use macro as one of other macro parameters list

Question

Here is a dummy example:

#define DEFINE_STRUCTURE(Result, Structure, a, b, c)  int a;
#define MEMBER_INT(name, width)                       Int, name, width
         


        

Answer 1

You need to add one more step to the substitution process.

#define DEFINE_STRUCTURE(Result, Structure, a, b, c)  int a;
#define MEMBER_INT(name, width)                       Int, name, width

#define DEFINE_STRUCTURE2(Result, Structure, x) DEFINE_STRUCTURE(Result, Structure, x)
DEFINE_STRUCTURE2(Result, Structure,  MEMBER_INT(b, c))

Remember: on an invocation of a function-like macro, arguments are identified, then each argument is separately evaluated, then the parameters are substituted by the results of the evaluation.