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/*
* ion/ioncore/region-iter.h
*
* Copyright (c) Tuomo Valkonen 1999-2007.
*
* See the included file LICENSE for details.
*/
#ifndef ION_IONCORE_REGION_ITER_H
#define ION_IONCORE_REGION_ITER_H
#define REGION_FIRST_CHILD(PAR) (((WRegion*)(PAR))->children)
#define REGION_LAST_CHILD(PAR) \
(REGION_FIRST_CHILD(PAR)==NULL ? NULL \
: REGION_PREV_CHILD_WRAP(REGION_FIRST_CHILD(PAR), REGION_FIRST_CHILD(PAR)))
#define REGION_NEXT_CHILD(PAR, REG) (((WRegion*)(REG))->p_next)
#define REGION_PREV_CHILD(PAR, REG) ((((WRegion*)(REG))->p_prev->p_next) ? \
(((WRegion*)(REG))->p_prev) : NULL)
#define REGION_NEXT_CHILD_WRAP(PAR, REG) \
(((REG) && ((WRegion*)(REG))->p_next) \
? ((WRegion*)(REG))->p_next : REGION_FIRST_CHILD(PAR))
#define REGION_PREV_CHILD_WRAP(PAR, REG) \
((REG) ? ((WRegion*)(REG))->p_prev \
: REGION_FIRST_CHILD(PAR))
#define FOR_ALL_CHILDREN(PAR, REG) \
for((REG)=((WRegion*)(PAR))->children; (REG)!=NULL; (REG)=(REG)->p_next)
#define FOR_ALL_CHILDREN_W_NEXT(PAR, REG, NEXT) \
for((REG)=((WRegion*)(PAR))->children, (NEXT)=((REG)==NULL ? NULL : (REG)->p_next);\
(REG)!=NULL; \
(REG)=(NEXT), (NEXT)=((REG)==NULL ? NULL : (REG)->p_next))
#endif /* ION_IONCORE_REGION_ITER_H */
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