package monadlib

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package monadlib

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Module type `Monad.Writer`

A writer allows an additional output value to be written during computations and accumulated into a final result.

type t

include BatInterfaces.Monad

type 'a m

val bind : 'a m -> ('a -> 'b m) -> 'b m

val return : 'a -> 'a m

val listen : 'a m -> (t * 'a) m

Listen to the written value.

val run : 'a m -> t * 'a

Run the writer, extracting both outputs.

val write : t -> unit m

Write a value.