package monads

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package monads
Legend:
Library
Module
Module type
Parameter
Class
Class type

Parameters

module M : Monad

Signature

include Trans.S with type 'a t := 'a T(M).t with type 'a m := 'a T(M).m with type 'a e := 'a T(M).e
val lift : 'a T(M).m -> 'a T(M).t

lifts inner monad into the resulting monad

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

runs the computation

include Monad with type 'a t := 'a T(M).t
val void : 'a T(M).t -> unit T(M).t

void m computes m and discrards the result.

val sequence : unit T(M).t list -> unit T(M).t

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

val forever : 'a T(M).t -> 'b T(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.S interface for lists

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

The Monad.Collection.S interface for sequences

include Syntax.S with type 'a t := 'a T(M).t
val (>=>) : ('a -> 'b T(M).t) -> ('b -> 'c T(M).t) -> 'a -> 'c T(M).t

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

val (!!) : 'a -> 'a T(M).t

!!x is return x

val (!$) : ('a -> 'b) -> 'a T(M).t -> 'b T(M).t

!$f is Lift.unary f

val (!$$) : ('a -> 'b -> 'c) -> 'a T(M).t -> 'b T(M).t -> 'c T(M).t

!$$f is Lift.binary f

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

!$$$f is Lift.ternary f

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

!$$$$f is Lift.quaternary f

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

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

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

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

include Fail.S with type 'a t := 'a T(M).t with type 'a error = exn
type 'a error = exn

a type of error

val fail : _ error -> 'a T(M).t

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

val catch : 'a T(M).t -> (_ error -> 'a T(M).t) -> 'a T(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.

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