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/*-----------------------------------------------------------------------------
*
* (c) The GHC Team, 1999
*
* Prototypes for Hash.c
*
* -------------------------------------------------------------------------- */
#ifndef HASH_H
#define HASH_H
#include "BeginPrivate.h"
typedef struct hashtable HashTable; /* abstract */
/* Hash table access where the keys are StgWords.
* Values are passed into the hash table and stored as `const void *` values,
* but when the value is looked up or removed, the value is returned without the
* `const` so that calling function can mutate what the pointer points to if it
* needs to.
*/
HashTable * allocHashTable ( void );
void insertHashTable ( HashTable *table, StgWord key, const void *data );
void * lookupHashTable ( const HashTable *table, StgWord key );
void * removeHashTable ( HashTable *table, StgWord key, const void *data );
int keyCountHashTable (HashTable *table);
// Puts up to szKeys keys of the hash table into the given array. Returns the
// actual amount of keys that have been retrieved.
//
// If the table is modified concurrently, the function behavior is undefined.
//
int keysHashTable(HashTable *table, StgWord keys[], int szKeys);
/* Hash table access where the keys are C strings (the strings are
* assumed to be allocated by the caller, and mustn't be deallocated
* until the corresponding hash table entry has been removed).
*/
HashTable * allocStrHashTable ( void );
#define lookupStrHashTable(table, key) \
(lookupHashTable(table, (StgWord)key))
#define insertStrHashTable(table, key, data) \
(insertHashTable(table, (StgWord)key, data))
#define removeStrHashTable(table, key, data) \
(removeHashTable(table, (StgWord)key, data))
/* Hash tables for arbitrary keys */
typedef int HashFunction(const HashTable *table, StgWord key);
typedef int CompareFunction(StgWord key1, StgWord key2);
HashTable * allocHashTable_(HashFunction *hash, CompareFunction *compare);
int hashWord(const HashTable *table, StgWord key);
int hashStr(const HashTable *table, char *key);
/* Freeing hash tables
*/
void freeHashTable ( HashTable *table, void (*freeDataFun)(void *) );
void exitHashTable ( void );
#include "EndPrivate.h"
#endif /* HASH_H */
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