diff options
Diffstat (limited to 'Types/UUID.hs')
| -rw-r--r-- | Types/UUID.hs | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/Types/UUID.hs b/Types/UUID.hs index de7ddd65d..27d82b86c 100644 --- a/Types/UUID.hs +++ b/Types/UUID.hs @@ -5,6 +5,8 @@ - Licensed under the GNU GPL version 3 or higher. -} +{-# LANGUAGE TypeSynonymInstances, FlexibleInstances #-} + module Types.UUID where import qualified Data.Map as M @@ -19,9 +21,12 @@ fromUUID :: UUID -> String fromUUID (UUID u) = u fromUUID NoUUID = "" -toUUID :: String -> UUID -toUUID [] = NoUUID -toUUID s = UUID s +class ToUUID a where + toUUID :: a -> UUID + +instance ToUUID String where + toUUID [] = NoUUID + toUUID s = UUID s isUUID :: String -> Bool isUUID = isJust . U.fromString |