} voidacc;
int voidacc_ctor(voidacc*); /* the ctor, returning 0 for success */
int voidacc_acc(voidacc*, void*); /* Accumulate an element into result,
} voidacc;
int voidacc_ctor(voidacc*); /* the ctor, returning 0 for success */
int voidacc_acc(voidacc*, void*); /* Accumulate an element into result,