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ANSI Common Lisp  18 Hash Tables 18.2 Dictionary of Hash Tables
| 18.2.4 hash-table-count |
Function |
- Syntax:
-
hash-table-count
hash-table
 count
- Arguments and Values:
-
hash-table - a hash table.
count - a non-negative integer.
- Description:
-
Returns the number of entries in the hash-table.
If hash-table has just been created
or newly cleared (see clrhash)
the entry count is 0.
- Examples:
-
(setq table (make-hash-table)) #<HASH-TABLE EQL 0/120 32115135>
(hash-table-count table) 0
(setf (gethash 57 table) "fifty-seven") "fifty-seven"
(hash-table-count table) 1
(dotimes (i 100) (setf (gethash i table) i)) NIL
(hash-table-count table) 100
- Affected By:
-
clrhash,
remhash,
setf of gethash
- See Also:
-
hash-table-size
- Notes:
-
The following relationships are functionally correct, although in practice
using hash-table-count is probably much faster:
(hash-table-count table) ==
(loop for value being the hash-values of table count t) ==
(let ((total 0))
(maphash #'(lambda (key value)
(declare (ignore key value))
(incf total))
table)
total)
- Allegro CL Implementation Details:
-
None.
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