Parameter Via_map_and_join.Req

type ('a, 'index) t

The type held by the Indexed Monad Plus.

include Preface_specs.Indexed_monad.WITH_RETURN with type ('a, 'index) t := ('a, 'index) t
val return : 'a -> ('a, 'index) t

Lift a value into a t.

include Preface_specs.Indexed_bind.WITH_MAP_AND_JOIN with type ('a, 'index) t := ('a, 'index) t
val map : ('a -> 'b) -> ('a, 'index) t -> ('b, 'index) t

Mapping over from 'a to 'b.

val join : (('a, 'index) t, 'index) t -> ('a, 'index) t

join remove one level of monadic structure, projecting its bound argument into the outer level.

val combine : ('a, 'index) t -> ('a, 'index) t -> ('a, 'index) t

Combine two values of t into one.

val neutral : ('a, 'index) t

The neutral element of the t.