Mercurial > urweb
view lib/ur/option.urs @ 1918:c3c84fd38815
Postgres: remove DML error code logging and (hopefully) fix the real problem, not checking for concurrency faults on SELECTs
author | Adam Chlipala <adam@chlipala.net> |
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date | Fri, 29 Nov 2013 08:12:57 -0500 |
parents | 36428d853c97 |
children |
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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 val unsafeGet : a ::: Type -> option a -> a