ghc-stateref

Abstraction for things that work like IORef

A collection of type-classes generalizing the read/write/modify operations for stateful variables provided by things like IORef, TVar,&c. Note that The interface has changed a bit from the 0.2.* version. "*Ref" functions are now called "*Reference" and new "*Ref" function exist with simpler signatures. The new 'Ref' existential type provides a convenient monad-indexed reference type, and the HasRef class indicates monads for which there is a default reference type for every referent.

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