Mercurial > urweb
annotate lib/ur/option.urs @ 1421:3dab4696d116
Subqueries may always return NULL
| author | Adam Chlipala <adam@chlipala.net> |
|---|---|
| date | Thu, 03 Feb 2011 21:04:12 -0500 |
| parents | 757dbac0454d |
| children | a99b743a3087 |
| rev | line source |
|---|---|
| adamc@841 | 1 datatype t = datatype Basis.option |
| adamc@841 | 2 |
| adamc@846 | 3 val eq : a ::: Type -> eq a -> eq (t a) |
| adamc@961 | 4 val ord : a ::: Type -> ord a -> ord (t a) |
| adamc@846 | 5 |
| adamc@944 | 6 val isNone : a ::: Type -> t a -> bool |
| adamc@841 | 7 val isSome : a ::: Type -> t a -> bool |
| adamc@844 | 8 |
| adamc@844 | 9 val mp : a ::: Type -> b ::: Type -> (a -> b) -> t a -> t b |
| adamc@846 | 10 val bind : a ::: Type -> b ::: Type -> (a -> option b) -> t a -> t b |
| adamc@1068 | 11 |
| adamc@1068 | 12 val get : a ::: Type -> a -> option a -> a |