Safe Haskell	None
Language	Haskell2010

Data.AssocList.ListLike.Concept

Contents

Synopsis

Association list type

type AssocList l a b = ListLike l (a, b) Source #

Related modules

Data.AssocList.ListLike.Eq - Functions that involve Eq constraints on the keys
Data.AssocList.ListLike.Equivalence - Most of the same functions as the Eq module, but with an Equivalence parameter instead of an Eq constraint
Data.AssocList.ListLike.Predicate - Most of the same functions as the Eq module, but specifying keys using a Predicate rather than a particular key
Data.AssocList.ListLike.Ord - Functions that involve Ord constraints on the keys
Data.AssocList.ListLike.Comparison - The same functions as the Ord module, but with a Comparison parameter instead of an Ord constraint.

This exception shows up when one attempts to retrieve a value by key from an association list using a partial function with a type signature such as

(!) :: (LikeLike l (a, b), Eq a) => l -> a -> b

but no result can be obtained because the requested key is not present exists in the mapping.

Constructors

Instances details

Eq MissingAssocListKey Source #
Instance details Defined in Data.AssocList.ListLike.Concept Methods (==) :: MissingAssocListKey -> MissingAssocListKey -> Bool # (/=) :: MissingAssocListKey -> MissingAssocListKey -> Bool #
Show MissingAssocListKey Source #
Instance details Defined in Data.AssocList.ListLike.Concept Methods showsPrec :: Int -> MissingAssocListKey -> ShowS # show :: MissingAssocListKey -> String # showList :: [MissingAssocListKey] -> ShowS #
Exception MissingAssocListKey Source #
Instance details Defined in Data.AssocList.ListLike.Concept Methods toException :: MissingAssocListKey -> SomeException # fromException :: SomeException -> Maybe MissingAssocListKey # displayException :: MissingAssocListKey -> String #