queues.h
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上传日期:2007-01-02
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- /* Copyright Abandoned 1996 TCX DataKonsult AB & Monty Program KB & Detron HB
- This file is public domain and comes with NO WARRANTY of any kind */
- /*
- Code for generell handling of priority Queues.
- Implemention of queues from "Algoritms in C" by Robert Sedgewick.
- Copyright Monty Program KB.
- By monty.
- */
- #ifndef _queues_h
- #define _queues_h
- #ifdef __cplusplus
- extern "C" {
- #endif
- typedef struct st_queue {
- byte **root;
- uint elements;
- uint max_elements;
- uint offset_to_key; /* compare is done on element+offset */
- int max_at_top; /* Set if queue_top gives max */
- int (*compare)(byte *,byte *);
- } QUEUE;
- #define queue_top(queue) ((queue)->root[1])
- #define queue_element(queue,index) ((queue)->root[index+1])
- #define queue_end(queue) ((queue)->root[(queue)->elements])
- #define queue_replaced(queue) _downheap(queue,1)
- int init_queue(QUEUE *queue,uint max_elements,uint offset_to_key,
- pbool max_at_top, int (*compare)(byte *,byte *));
- void delete_queue(QUEUE *queue);
- void queue_insert(QUEUE *queue,byte *element);
- byte *queue_remove(QUEUE *queue,uint index);
- void _downheap(QUEUE *queue,uint index);
- #ifdef __cplusplus
- }
- #endif
- #endif