CLHS: Function HASH-TABLE-REHASH-SIZE

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Function HASH-TABLE-REHASH-SIZE

Syntax:

hash-table-rehash-size hash-table => rehash-size

Arguments and Values:

hash-table---a hash table.

rehash-size---a real of type `(or (integer 1 *) (float (1.0) *))`.

Description:

Returns the current rehash size of hash-table, suitable for use in a call to make-hash-table in order to produce a hash table with state corresponding to the current state of the hash-table.

Examples:

     (setq table (make-hash-table :size 100 :rehash-size 1.4))
    =>  #<HASH-TABLE EQL 0/100 2556371>
     (hash-table-rehash-size table) =>  1.4

Side Effects: None.

Affected By: None.

Exceptional Situations:

Should signal an error of type type-error if hash-table is not a hash table.

See Also:

make-hash-table, hash-table-rehash-threshold

Notes:

If the hash table was created with an integer rehash size, the result is an integer, indicating that the rate of growth of the hash-table when rehashed is intended to be additive; otherwise, the result is a float, indicating that the rate of growth of the hash-table when rehashed is intended to be multiplicative. However, this value is only advice to the implementation; the actual amount by which the hash-table will grow upon rehash is implementation-dependent.

The following X3J13 cleanup issues, not part of the specification, apply to this section:

- HASH-TABLE-REHASH-SIZE-INTEGER
- HASH-TABLE-ACCESS:X3J13-MAR-89

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