Damn, Xmacros in C are awesome.
Why didn't I know about this before.

Gesundheit.

Looks like a fast way to make simple things complicated. Maybe they have good uses somewhere.

@electrineer
I use them to have the members of a config struct and their default values for the init function, all in one place.

Wait, what did I miss out on ?

ssssss...

@dder
It's essentially

#define X(A, B, C) BOILERPLATE
#include “x.h“
#undef X

x.h contains lines like
X(int, a)
X(char, b)

You move the stuff that changes into it's own section and let a short-lived macro generate the boilerplate.
This is especially useful, when used across multiple files.

Eg,

--x.h--
X(int, a, 1)
X(int, b, 7)

--types.h--
typeset struct {
#define X(A,B,X) A B;
#include “x.h“
#undef X
} extype;

--types.c--
void exinit(extype *e) {
#define X(A,B,C) e->A = C;
#include “x.h“
#undef X
}

@metamourge why is this called an Xmacro? Looks just like normal macros except someone decided to call all of them X instead of something like INIT() or something. Is that it?