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/* table.h: Interface for a dictionary
 *
 * $Id: //info.ravenbrook.com/project/mps/custom/cet/main/code/table.h#3 $
 * Copyright (c) 2001-2014 Ravenbrook Limited.  See end of file for license.
 *
 * A table is a hashed mapping from keys to values.
 */

#ifndef table_h
#define table_h

#include "mpmtypes.h"
#include <stddef.h>


typedef struct TableStruct *Table;

typedef Word TableKey;
typedef void *TableValue;

typedef struct TableEntryStruct {
  TableKey key;
  TableValue value;
} TableEntryStruct, *TableEntry;

typedef void *(*TableAllocFunction)(void *closure, size_t size);
typedef void (*TableFreeFunction)(void *closure, void *p, size_t size);

#define TableSig        ((Sig)0x5192AB13) /* SIGnature TABLE */

typedef struct TableStruct {
  Sig sig;                      /* <design/sig/> */
  Count length;                 /* Number of slots in the array */
  Count count;                  /* Active entries in the table */
  TableEntry array;             /* Array of table slots */
  TableAllocFunction alloc;
  TableFreeFunction free;
  void *allocClosure;
  TableKey unusedKey;           /* key marking unused (undefined) entries */
  TableKey deletedKey;          /* key marking deleted entries */
} TableStruct;

extern Res TableCreate(Table *tableReturn,
                       Count length,
                       TableAllocFunction tableAlloc,
                       TableFreeFunction tableFree,
                       void *allocClosure,
                       TableKey unusedKey,
                       TableKey deletedKey);
extern void TableDestroy(Table table);
extern Bool TableCheck(Table table);
extern Res TableDefine(Table table, TableKey key, TableValue value);
extern Res TableRedefine(Table table, TableKey key, TableValue value);
extern Bool TableLookup(TableValue *valueReturn, Table table, TableKey key);
extern Res TableRemove(Table table, TableKey key);
extern Count TableCount(Table table);
extern void TableMap(Table table,
                     void(*fun)(void *closure, TableKey key, TableValue value),
                     void *closure);
extern Res TableGrow(Table table, Count extraCapacity);


#endif /* table_h */


/* C. COPYRIGHT AND LICENSE
 *
 * Copyright (C) 2001-2014 Ravenbrook Limited <http://www.ravenbrook.com/>.
 * All rights reserved.  This is an open source license.  Contact
 * Ravenbrook for commercial licensing options.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * 3. Redistributions in any form must be accompanied by information on how
 * to obtain complete source code for this software and any accompanying
 * software that uses this software.  The source code must either be
 * included in the distribution or be available for no more than the cost
 * of distribution plus a nominal fee, and must be freely redistributable
 * under reasonable conditions.  For an executable file, complete source
 * code means the source code for all modules it contains. It does not
 * include source code for modules or files that typically accompany the
 * major components of the operating system on which the executable file
 * runs.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */