Mercurial > urweb

annotate lib/ur/option.ur @ 844:74a1e3bdf430

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Fix datatype import bug in Elaborate; fix server-side source setting; more standard library stuff
author Adam Chlipala <adamc@hcoop.net>
date Sun, 07 Jun 2009 16:45:00 -0400
parents 44c2c089ca15
children 0d30e6338c65
rev   line source
adamc@841 1 datatype t = datatype Basis.option
adamc@841 2
adamc@841 3 fun isSome [a] x =
adamc@841 4 case x of
adamc@841 5 None => False
adamc@841 6 | Some _ => True
adamc@844 7
adamc@844 8 fun mp [a] [b] f x =
adamc@844 9 case x of
adamc@844 10 None => None
adamc@844 11 | Some y => Some (f y)