Safe Haskell	Safe
Language	Haskell98

Control.Monad.TagShare

Contents

Dynamic map
Sharing monad

Description

A monad for binding values to tags to ensure sharing, with the added twist that the value can be polymorphic and each monomorphic instance is bound separately.

Synopsis

data DynMap tag
dynEmpty :: DynMap tag
dynInsert :: (Typeable a, Ord tag) => tag -> a -> DynMap tag -> DynMap tag
dynLookup :: (Typeable a, Ord tag) => tag -> DynMap tag -> Maybe a
type Sharing tag a = State (DynMap tag) a
runSharing :: Sharing tag a -> a
share :: (Typeable a, Ord tag) => tag -> Sharing tag a -> Sharing tag a

Dynamic map

data DynMap tag Source #

A dynamic map with type safe insertion and lookup.

Instances

Instances details

Show tag => Show (DynMap tag) Source #
Instance details Defined in Control.Monad.TagShare Methods showsPrec :: Int -> DynMap tag -> ShowS show :: DynMap tag -> String showList :: [DynMap tag] -> ShowS

dynEmpty :: DynMap tag Source #

dynInsert :: (Typeable a, Ord tag) => tag -> a -> DynMap tag -> DynMap tag Source #

dynLookup :: (Typeable a, Ord tag) => tag -> DynMap tag -> Maybe a Source #

Sharing monad

type Sharing tag a = State (DynMap tag) a Source #

A sharing monad with a function that binds a tag to a value.

runSharing :: Sharing tag a -> a Source #

share :: (Typeable a, Ord tag) => tag -> Sharing tag a -> Sharing tag a Source #