package stdune

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stdune
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stdune.filesystem_stubs
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Library
Module
Module type
Parameter
Class
Class type

This functor extends the basic definition of a commutative monoid by adding a convenient operator synonym ( @ ) = combine, as well as derived functions reduce and map_reduce.

Parameters

module M : Basic

Signature

val empty : M.t

Must be the identity of combine:

combine empty t = t
combine t empty = t

val combine : M.t -> M.t -> M.t

Must be associative:

combine a (combine b c) = combine (combine a b) c

module O : sig ... end

val reduce : M.t list -> M.t

val map_reduce : f:('a -> M.t) -> 'a list -> M.t

type combine_is_commutative = unit