package monadlib

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Module type Monad.BasePlus

Monads with additional monoid structure.

include BatInterfaces.Monad
type 'a m
val bind : 'a m -> ('a -> 'b m) -> 'b m
val return : 'a -> 'a m
val zero : unit -> 'a m
val plus : 'a m -> 'a m -> 'a m
val null : 'a m -> bool

null x implies that x is zero. If you do not want to or cannot answer whether a given x is zero, then null x should be false. I have provided this so that streams can be implemented more efficiently.