Mercurial > urweb

view lib/ur/option.urs @ 1564:da11f7b18067

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add an URWEB_PQ_CON environment variable, which overrides the PostgreSQL connection string.
author Austin Seipp <as@hacks.yi.org>
date Fri, 23 Sep 2011 23:11:59 -0500
parents a99b743a3087
children 36428d853c97
line wrap: on
line source
datatype t = datatype Basis.option

val monad : monad t

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