package stdune

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package stdune
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Library
Module
Module type
Parameter
Class
Class type

The product of monoids where pairs are combined component-wise.

Parameters

module A : sig ... end
module B : sig ... end

Signature

type t = A.t * B.t
val empty : t

Must be the identity of combine:

  • combine empty t = t
  • combine t empty = t
val combine : t -> t -> t

Must be associative:

  • combine a (combine b c) = combine (combine a b) c
module O : sig ... end
val reduce : t list -> t
val map_reduce : f:('a -> t) -> 'a list -> t