diff options
Diffstat (limited to 'src/include/utils/hsearch.h')
| -rw-r--r-- | src/include/utils/hsearch.h | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/src/include/utils/hsearch.h b/src/include/utils/hsearch.h index 881327a3e03..5bd693063ac 100644 --- a/src/include/utils/hsearch.h +++ b/src/include/utils/hsearch.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/utils/hsearch.h,v 1.37 2005/06/08 23:02:05 tgl Exp $ + * $PostgreSQL: pgsql/src/include/utils/hsearch.h,v 1.38 2005/06/18 20:51:30 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -16,14 +16,25 @@ /* - * Hash and comparison functions must have these signatures. Comparison - * functions return zero for match, nonzero for no match. (The comparison - * function definition is designed to allow memcmp() and strncmp() to be - * used directly as key comparison functions.) + * Hash functions must have this signature. */ typedef uint32 (*HashValueFunc) (const void *key, Size keysize); + +/* + * Key comparison functions must have this signature. Comparison functions + * return zero for match, nonzero for no match. (The comparison function + * definition is designed to allow memcmp() and strncmp() to be used directly + * as key comparison functions.) + */ typedef int (*HashCompareFunc) (const void *key1, const void *key2, - Size keysize); + Size keysize); + +/* + * Key copying functions must have this signature. The return value is not + * used. (The definition is set up to allow memcpy() and strncpy() to be + * used directly.) + */ +typedef void *(*HashCopyFunc) (void *dest, const void *src, Size keysize); /* * Space allocation function for a hashtable --- designed to match malloc(). @@ -103,6 +114,7 @@ typedef struct HTAB HASHSEGMENT *dir; /* directory of segment starts */ HashValueFunc hash; /* hash function */ HashCompareFunc match; /* key comparison function */ + HashCopyFunc keycopy; /* key copying function */ HashAllocFunc alloc; /* memory allocator */ MemoryContext hcxt; /* memory context if default allocator * used */ @@ -123,6 +135,7 @@ typedef struct HASHCTL Size entrysize; /* total user element size in bytes */ HashValueFunc hash; /* hash function */ HashCompareFunc match; /* key comparison function */ + HashCopyFunc keycopy; /* key copying function */ HashAllocFunc alloc; /* memory allocator */ HASHSEGMENT *dir; /* directory of segment starts */ HASHHDR *hctl; /* location of header in shared mem */ @@ -140,6 +153,7 @@ typedef struct HASHCTL #define HASH_ALLOC 0x100 /* Set memory allocator */ #define HASH_CONTEXT 0x200 /* Set explicit memory context */ #define HASH_COMPARE 0x400 /* Set user defined comparison function */ +#define HASH_KEYCOPY 0x800 /* Set user defined key-copying function */ /* max_dsize value to indicate expansible directory */ |