Mercurial > urweb

view lib/ur/option.urs @ 1242:4ed556678214

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
At loop heads, havoc relations that might be changed by the loop
author Adam Chlipala <adamc@hcoop.net>
date Sat, 17 Apr 2010 14:26:52 -0400
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