FayRef

Documentation

data FayRef a

A mutable variable in the Fay monad.

newFayRef :: a -> Fay (FayRef a)

Build a new FayRef.

readFayRef :: FayRef a -> Fay a

Write a new value into a FayRef.

writeFayRef :: FayRef a -> a -> Fay ()

Write a new value into a FayRef.

modifyFayRef :: FayRef a -> (a -> a) -> Fay ()

Mutate the contents of a FayRef.

Be warned that modifyFayRef does not apply the function strictly. This means if the program calls modifyFayRef many times, but seldomly uses the value, thunks will pile up in memory resulting in a space leak.

modifyFayRef' :: FayRef a -> (a -> a) -> Fay ()

Strict version of modifyFayRef