Mercurial > urweb

view lib/ur/option.urs @ 1128:e1cf925e2074

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Allow escaped backslashes in literals; conversion betwixt int and char
author Adam Chlipala <adamc@hcoop.net>
date Tue, 12 Jan 2010 16:09:13 -0500
parents 757dbac0454d
children a99b743a3087
line wrap: on
line source
datatype t = datatype Basis.option

val eq : a ::: Type -> eq a -> eq (t a)
val ord : a ::: Type -> ord a -> ord (t a)

val isNone : a ::: Type -> t a -> bool
val isSome : a ::: Type -> t a -> bool

val mp : a ::: Type -> b ::: Type -> (a -> b) -> t a -> t b
val bind : a ::: Type -> b ::: Type -> (a -> option b) -> t a -> t b

val get : a ::: Type -> a -> option a -> a