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/**********************************************************************
* $Id$
*
* Name: cpl_hash_set.h
* Project: CPL - Common Portability Library
* Purpose: Hash set functions.
* Author: Even Rouault, <even dot rouault at spatialys.com>
*
**********************************************************************
* Copyright (c) 2008-2009, Even Rouault <even dot rouault at spatialys.com>
*
* SPDX-License-Identifier: MIT
****************************************************************************/
#ifndef CPL_HASH_SET_H_INCLUDED
#define CPL_HASH_SET_H_INCLUDED
#include "cpl_port.h"
/**
* \file cpl_hash_set.h
*
* Hash set implementation.
*
* An hash set is a data structure that holds elements that are unique
* according to a comparison function. Operations on the hash set, such as
* insertion, removal or lookup, are supposed to be fast if an efficient
* "hash" function is provided.
*/
CPL_C_START
/* Types */
/** Opaque type for a hash set */
typedef struct _CPLHashSet CPLHashSet;
/** CPLHashSetHashFunc */
typedef unsigned long (*CPLHashSetHashFunc)(const void *elt);
/** CPLHashSetEqualFunc */
typedef int (*CPLHashSetEqualFunc)(const void *elt1, const void *elt2);
/** CPLHashSetFreeEltFunc */
typedef void (*CPLHashSetFreeEltFunc)(void *elt);
/** CPLHashSetIterEltFunc */
typedef int (*CPLHashSetIterEltFunc)(void *elt, void *user_data);
/* Functions */
CPLHashSet CPL_DLL *CPLHashSetNew(CPLHashSetHashFunc fnHashFunc,
CPLHashSetEqualFunc fnEqualFunc,
CPLHashSetFreeEltFunc fnFreeEltFunc);
void CPL_DLL CPLHashSetDestroy(CPLHashSet *set);
void CPL_DLL CPLHashSetClear(CPLHashSet *set);
int CPL_DLL CPLHashSetSize(const CPLHashSet *set);
void CPL_DLL CPLHashSetForeach(CPLHashSet *set,
CPLHashSetIterEltFunc fnIterFunc,
void *user_data);
int CPL_DLL CPLHashSetInsert(CPLHashSet *set, void *elt);
void CPL_DLL *CPLHashSetLookup(CPLHashSet *set, const void *elt);
int CPL_DLL CPLHashSetRemove(CPLHashSet *set, const void *elt);
int CPL_DLL CPLHashSetRemoveDeferRehash(CPLHashSet *set, const void *elt);
unsigned long CPL_DLL CPLHashSetHashPointer(const void *elt);
int CPL_DLL CPLHashSetEqualPointer(const void *elt1, const void *elt2);
unsigned long CPL_DLL CPLHashSetHashStr(const void *pszStr);
int CPL_DLL CPLHashSetEqualStr(const void *pszStr1, const void *pszStr2);
CPL_C_END
#endif /* CPL_HASH_SET_H_INCLUDED */
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