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/*
* A generic structure queue (a queue for fixed length
* (generally small) structures.
*
* $Id$
*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL LICENSE BLOCK *****
*/
#ifndef BLI_GSQUEUE_H
#define BLI_GSQUEUE_H
typedef struct _GSQueue GSQueue;
/**
* Create a new GSQueue.
*
* @param elem_size The size of the structures in the queue.
* @retval The new queue
*/
GSQueue* BLI_gsqueue_new (int elem_size);
/**
* Query if the queue is empty
*/
int BLI_gsqueue_is_empty(GSQueue *gq);
/**
* Query number elements in the queue
*/
int BLI_gsqueue_size(GSQueue *gq);
/**
* Access the item at the head of the queue
* without removing it.
*
* @param item_r A pointer to an appropriatly
* sized structure (the size passed to BLI_gsqueue_new)
*/
void BLI_gsqueue_peek (GSQueue *gq, void *item_r);
/**
* Access the item at the head of the queue
* and remove it.
*
* @param item_r A pointer to an appropriatly
* sized structure (the size passed to BLI_gsqueue_new).
* Can be NULL if desired.
*/
void BLI_gsqueue_pop (GSQueue *gq, void *item_r);
/**
* Push an element onto the tail of the queue.
*
* @param item A pointer to an appropriatly
* sized structure (the size passed to BLI_gsqueue_new).
*/
void BLI_gsqueue_push (GSQueue *gq, void *item);
/**
* Push an element back onto the head of the queue (so
* it would be returned from the next call to BLI_gsqueue_pop).
*
* @param item A pointer to an appropriatly
* sized structure (the size passed to BLI_gsqueue_new).
*/
void BLI_gsqueue_pushback (GSQueue *gq, void *item);
/**
* Free the queue
*/
void BLI_gsqueue_free (GSQueue *gq);
#endif /* BLI_GSQUEUE_H */
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