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doc-src/Tutorial/Datatype/lookup
author wenzelm
Fri, 16 Jul 1999 22:24:42 +0200
changeset 7024 44bd3c094fd6
parent 5851 15ce4c1c8313
permissions -rw-r--r--
tuned;

consts   lookup :: ('a,'v)trie => 'a list => 'v option
primrec "lookup t [] = value t"
        "lookup t (a#as) = (case assoc (alist t) a of
                              None => None
                            | Some at => lookup at as)"
isabelle