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- #ifndef __FLAG_H__
- #define __FLAG_H__
- /* a set of routines that allow the programmer to "flag" cells in a
- * raster map. A flag is of type unsigned char, i.e. 8 bits can be set.
- *
- * int flag_set(flag, bitno)
- * sets the flag at position bitno to one.
- *
- * int flag_unset(flag, bitno)
- * sets the flag at position bitno to zero.
- *
- * int flag_get(flag, bitno)
- * checks if the flag is set at postion bitno.
- *
- * Examples:
- * set flag at position 0: FLAG_SET(flag, 0)
- * unset (clear) flag at position 7: FLAG_UNSET(flag, 7)
- * check flag at position 5: is_set_at_5 = FLAG_GET(flag, 5)
- */
- /* flag positions */
- #define NULLFLAG 0 /* elevation is NULL */
- #define EDGEFLAG 1 /* edge cell */
- #define INLISTFLAG 2 /* in open A* list */
- #define WORKEDFLAG 3 /* in closed A* list/ accumulation done */
- #define STREAMFLAG 4 /* stream */
- #define DEPRFLAG 5 /* real depression */
- #define WORKED2FLAG 6 /* extraction done */
- /* last bit is unused */
- #define FLAG_SET(flag,bitno) ((flag) |= (1 << (bitno)))
- #define FLAG_UNSET(flag,bitno) ((flag) &= ~(1 << (bitno)))
- #define FLAG_GET(flag,bitno) ((flag) & (1 << (bitno)))
- #endif /* __FLAG_H__ */
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