package monads

  1. Overview
  2. Docs
package monads
Legend:
Library
Module
Module type
Parameter
Class
Class type

Make2(M) composes the result monad with the monad M.

Parameters

module M : Monad

Signature

include Trans.S1 with type ('a, 'e) t := ('a, 'e) T2(M).t with type 'a m := 'a T2(M).m with type ('a, 'e) e := ('a, 'e) T2(M).e
val lift : 'a T2(M).m -> ('a, 'e) T2(M).t

lifts inner monad into the resulting monad

val run : ('a, 'e) T2(M).t -> ('a, 'e) T2(M).e

runs the computation

include Monad2 with type ('a, 'e) t := ('a, 'e) T2(M).t
val void : ('a, 'e) T2(M).t -> (unit, 'e) T2(M).t

void m computes m and discrards the result.

val sequence : (unit, 'e) T2(M).t list -> (unit, 'e) T2(M).t

sequence xs computes a sequence of computations xs in the left to right order.

val forever : ('a, 'e) T2(M).t -> ('b, 'e) T2(M).t

forever xs creates a computationt that never returns.

module Fn : sig ... end

Various function combinators lifted into the Kleisli category.

module Pair : sig ... end

The pair interface lifted into the monad.

module Triple : sig ... end

The triple interface lifted into a monad.

module Lift : sig ... end

Lifts functions into the monad.

module Exn : sig ... end

Interacting between monads and language exceptions

module Collection : sig ... end

Lifts collection interface into the monad.

module List : Collection.S with type 'a t := 'a list

The Monad.Collection.S2 interface for lists

module Seq : Collection.S with type 'a t := 'a Core_kernel.Sequence.t

The Monad.Collection.S2 interface for sequences

include Syntax.S2 with type ('a, 'e) t := ('a, 'e) T2(M).t
val (>=>) : ('a -> ('b, 'e) T2(M).t) -> ('b -> ('c, 'e) T2(M).t) -> 'a -> ('c, 'e) T2(M).t

f >=> g is fun x -> f x >>= g

val (!!) : 'a -> ('a, 'e) T2(M).t

!!x is return x

val (!$) : ('a -> 'b) -> ('a, 'e) T2(M).t -> ('b, 'e) T2(M).t

!$f is Lift.unary f

val (!$$) : ('a -> 'b -> 'c) -> ('a, 'e) T2(M).t -> ('b, 'e) T2(M).t -> ('c, 'e) T2(M).t

!$$f is Lift.binary f

val (!$$$) : ('a -> 'b -> 'c -> 'd) -> ('a, 'e) T2(M).t -> ('b, 'e) T2(M).t -> ('c, 'e) T2(M).t -> ('d, 'e) T2(M).t

!$$$f is Lift.ternary f

val (!$$$$) : ('a -> 'b -> 'c -> 'd -> 'e) -> ('a, 's) T2(M).t -> ('b, 's) T2(M).t -> ('c, 's) T2(M).t -> ('d, 's) T2(M).t -> ('e, 's) T2(M).t

!$$$$f is Lift.quaternary f

val (!$$$$$) : ('a -> 'b -> 'c -> 'd -> 'e -> 'f) -> ('a, 's) T2(M).t -> ('b, 's) T2(M).t -> ('c, 's) T2(M).t -> ('d, 's) T2(M).t -> ('e, 's) T2(M).t -> ('f, 's) T2(M).t

!$$$$$f is Lift.quinary f

include Core_kernel.Monad.S2 with type ('a, 'e) t := ('a, 'e) T2(M).t
val (>>=) : ('a, 'e) T2(M).t -> ('a -> ('b, 'e) T2(M).t) -> ('b, 'e) T2(M).t
val (>>|) : ('a, 'e) T2(M).t -> ('a -> 'b) -> ('b, 'e) T2(M).t
module Let_syntax : sig ... end
module Monad_infix : sig ... end
val bind : ('a, 'e) T2(M).t -> f:('a -> ('b, 'e) T2(M).t) -> ('b, 'e) T2(M).t
val return : 'a -> ('a, _) T2(M).t
val map : ('a, 'e) T2(M).t -> f:('a -> 'b) -> ('b, 'e) T2(M).t
val join : (('a, 'e) T2(M).t, 'e) T2(M).t -> ('a, 'e) T2(M).t
val ignore_m : (_, 'e) T2(M).t -> (unit, 'e) T2(M).t
val all : ('a, 'e) T2(M).t list -> ('a list, 'e) T2(M).t
val all_unit : (unit, 'e) T2(M).t list -> (unit, 'e) T2(M).t
val all_ignore : (unit, 'e) T2(M).t list -> (unit, 'e) T2(M).t
  • deprecated [since 2018-02] Use [all_unit]
module Syntax : Syntax.S2 with type ('a, 'e) t := ('a, 'e) T2(M).t

Monadic operators, see Monad.Syntax.S2 for more.

include Fail.S2 with type ('a, 'e) t := ('a, 'e) T2(M).t with type 'a error = 'a
type 'a error = 'a

a type of error

val fail : 'e error -> ('a, 'e) T2(M).t

fail err diverges the computation, possibly providing an extra information in a value of type 'e error.

val catch : ('a, 'e) T2(M).t -> ('e error -> ('a, 'e) T2(M).t) -> ('a, 'e) T2(M).t

catch m f if m diverges with some bottom value err, the f err is a result of the whole computation, otherwise returns m.

OCaml

Innovation. Community. Security.

GitHub Discord Twitter Peertube RSS
About
Changelog Releases Industrial Users Academic Users Why OCaml
Ecosystem
Packages Community Events OCaml Planet Jobs
Resources
Install OCaml Get Started Platform Tools Language Manual Standard Library API Books Exercises Papers OCaml Playground Logo
Policies
Carbon Footprint Governance Privacy Code of Conduct