18.1. Modifying Hash Table Keys

18.1. Modifying Hash Table Keys
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18.1. Modifying Hash Table Keys [sec_18-1-2]

If you "visibly modify" a key, consequences are unpredictable:

(LET ((hash-table (MAKE-HASH-TABLE :test 'EQUALP)))
 (SETF (GETHASH hash-table hash-table) T)
 (GETHASH hash-table hash-table))
⇒ NIL  ;
⇒ NIL

because (SETF GETHASH) modifies hash-table, the very next GETHASH does not find it in itself.

	These notes document CLISP version 2.49	Last modified: 2010年07月07日

Chapter 18. Hash Tables Home 18.2. Function MAKE-HASH-TABLE