- /* User-supplied function for freeing keys. It is specified in
- hash_initialize. If non-null, it is used by hash_free and
- hash_clear. You should specify `free' here only if you want
- these functions to free all of your `key' data. This is typically
- the case when your key is simply an auxilliary struct that you
- have malloc'd to aggregate several values. */
- Hash_key_freer_type hash_key_freer;
-
- /* User-supplied hash function that hashes entry E to an integer
- in the range 0..TABLE_SIZE-1. */
- unsigned int (*hash_hash) (const void *e, unsigned int table_size);
-
- /* User-supplied function that determines whether a new entry is
- unique by comparing the new entry to entries that hashed to the
- same bucket index. It should return zero for a pair of entries
- that compare equal, non-zero otherwise. */
-
- int (*hash_key_comparator) (const void *, const void *);
-
- HASH_ENT **hash_table;
- unsigned int hash_table_size;
- unsigned int hash_n_slots_used;
- unsigned int hash_max_chain_length;
-
- /* Gets set when an entry is deleted from a chain of length
- hash_max_chain_length. Indicates that hash_max_chain_length
- may no longer be valid. */
- unsigned int hash_dirty_max_chain_length;
-
- /* Sum of lengths of all chains (not counting any dummy
- header entries). */
- unsigned int hash_n_keys;
-
- /* A linked list of freed HASH_ENT structs.
- FIXME: Perhaps this is unnecessary and we should simply free
- and reallocate such structs. */
- HASH_ENT *hash_free_entry_list;
-
- /* FIXME: comment. */
-# ifdef USE_OBSTACK
- struct obstack ht_obstack;
-# endif
+ /* This structure is mainly used for `hash_initialize', see the block
+ documentation of `hash_reset_tuning' for more complete comments. */
+
+ float shrink_threshold; /* ratio of used buckets to trigger a shrink */
+ float shrink_factor; /* ratio of new smaller size to original size */
+ float growth_threshold; /* ratio of used buckets to trigger a growth */
+ float growth_factor; /* ratio of new bigger size to original size */
+ bool is_n_buckets; /* if CANDIDATE really means table size */