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view lib/ur/option.urs @ 1419:00b79f39be25

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Allow 'alt' attribute of <img> (suggested by Karn Kallio)
author Adam Chlipala <adam@chlipala.net>
date Tue, 25 Jan 2011 06:59:29 -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