Cringe Oop

oop.c

#include <stdlib.h>
#include <assert.h>

#define CLASS(class$_name, class$_fields, class$_constr_args, class$_constr_body) \
    typedef struct class$_name \
    class$_fields \
    class$_name; \
    class$_name *class$_name ## _init class$_constr_args \
    { \
        class$_name *self = malloc(sizeof(class$_name)); \
        class$_constr_body \
        return self; \
    } \

#define new(TYPE, ...) TYPE ## _init(__VA_ARGS__);

CLASS(IntClass, {int n;}, (int n), {self->n = n;})

int main(void)
{
    IntClass *i = new(IntClass, 42);
    assert(i->n == 42);
    return 0;
}