queue.h

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/*
 
Copyright (c) 2005-2008, Simon Howard
 
Permission to use, copy, modify, and/or distribute this software
for any purpose with or without fee is hereby granted, provided
that the above copyright notice and this permission notice appear
in all copies.
 
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 */

 
#ifndef ALGORITHM_QUEUE_H
#define ALGORITHM_QUEUE_H
 
#ifdef __cplusplus
extern "C" {
#endif

 
typedef struct _Queue Queue;

 
typedef void *QueueValue;

 
#define QUEUE_NULL ((void *) 0)

 
Queue *queue_new(void);

 
void queue_free(Queue *queue);

 
int queue_push_head(Queue *queue, QueueValue data);

 
QueueValue queue_pop_head(Queue *queue);

 
QueueValue queue_peek_head(Queue *queue);

 
int queue_push_tail(Queue *queue, QueueValue data);

 
QueueValue queue_pop_tail(Queue *queue);

 
QueueValue queue_peek_tail(Queue *queue);

 
int queue_is_empty(Queue *queue);
 
#ifdef __cplusplus
}
#endif
 
#endif /* #ifndef ALGORITHM_QUEUE_H */