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/**
Copyright (C) 2006 Free Software Foundation, Inc.
Written by: Matt Rice <ratmice@yahoo.com>
Date: 2006
This file is part of the Performance Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
*/
#import <Foundation/NSZone.h>
#define GSISLMaxNumberOfLevels 16
#define GSISLMaxLevel 15
/*
* attempt at caching the previously looked up index
* to reduce the search time required when wantedIndex > previousIndex
* this didn't seem to provide any benefit, actually negatively impacting
* performance though it was never thoroughly tested it
*/
#define GSISL_CACHE_OPT 0
typedef id GSISLValueType;
typedef struct GSISLNode_t *GSISLNode;
extern GSISLNode GSISLNil;
struct GSISLForward_t
{
unsigned delta;
GSISLNode next;
};
struct GSISLNode_t
{
GSISLValueType value;
struct GSISLForward_t forward[1];
};
typedef struct GSIndexedSkipList
{
int level; /* Maximum level of the list
(1 more than the number of levels in the list) */
GSISLNode header; /* pointer to header */
unsigned count;
NSZone *zone;
#if GSISL_CACHE_OPT
unsigned indexCache[GSISLMaxNumberOfLevels];
GSISLNode nodeCache[GSISLMaxNumberOfLevels];
#endif
} * GSISList;
void GSISLInitialize();
void GSISLFreeList(GSISList l);
GSISList GSISLInitList(NSZone *zone);
void GSISLInsertItemAtIndex(GSISList l,
GSISLValueType value,
unsigned index);
GSISLValueType GSISLItemAtIndex(GSISList l, unsigned index);
GSISLValueType GSISLRemoveItemAtIndex(GSISList l,
unsigned index);
GSISLValueType GSISLReplaceItemAtIndex(GSISList l,
GSISLValueType newVal,
unsigned index);
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