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More type safety on string types?

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Mats Rauhala
2021-01-03 00:16:36 +02:00
parent 9048581ea1
commit 7bae9ca92e
1 changed files with 4 additions and 4 deletions
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8
src/Data/Query.hs
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@@ -29,18 +29,18 @@ data Field a where
Title :: Field String Title :: Field String
data QueryF f where data QueryF f where
StartsWith :: Field a -> a -> QueryF f StartsWith :: Field String -> String -> QueryF f
EndsWith :: Field a -> a -> QueryF f EndsWith :: Field String -> String -> QueryF f
And :: f -> f -> QueryF f And :: f -> f -> QueryF f
deriving instance Functor QueryF deriving instance Functor QueryF
type Query = Fix QueryF type Query = Fix QueryF
startsWith :: Field a -> a -> Query startsWith :: Field String -> String -> Query
startsWith field x = Fix (StartsWith field x) startsWith field x = Fix (StartsWith field x)
endsWith :: Field a -> a -> Query endsWith :: Field String -> String -> Query
endsWith field x = Fix (EndsWith field x) endsWith field x = Fix (EndsWith field x)
(.&&.) :: Query -> Query -> Query (.&&.) :: Query -> Query -> Query