ARB_ROOT
lb = (is32bit ? (void *)ARB_ROOT(ctd32tree) :
(void *)ARB_ROOT(ctd64tree));
ARB_COLOR(ARB_ROOT(head), field) = ARB_BLACK; \
elm != ARB_ROOT(head)) { \
elm = ARB_ROOT(head); \
elm = ARB_ROOT(head); \
tmp = ARB_ROOT(head); \
const struct type *tmp = ARB_ROOT(head); \
const struct type *tmp = ARB_ROOT(head); \
const struct type *tmp = ARB_EMPTY(head) ? NULL : ARB_ROOT(head);\
tmp = ARB_ROOT(root);