package travesty

  1. Overview
  2. Docs
package travesty
Legend:
Library
Module
Module type
Parameter
Class
Class type
include Base.Monad.S2
type ('a, 'e) t
val (>>=) : ('a, 'e) t -> ('a -> ('b, 'e) t) -> ('b, 'e) t
val (>>|) : ('a, 'e) t -> ('a -> 'b) -> ('b, 'e) t
module Let_syntax : sig ... end
module Monad_infix : sig ... end
val bind : ('a, 'e) t -> f:('a -> ('b, 'e) t) -> ('b, 'e) t
val map : ('a, 'e) t -> f:('a -> 'b) -> ('b, 'e) t
val join : (('a, 'e) t, 'e) t -> ('a, 'e) t
val ignore_m : (_, 'e) t -> (unit, 'e) t
val all : ('a, 'e) t list -> ('a list, 'e) t
val all_unit : (unit, 'e) t list -> (unit, 'e) t
include State_types.Generic with type ('a, 's) t := ('a, 's) t and type 's state := 's and type 'a final := 'a

State monads share the signatures of their builder functions with state transformers...

include State_transform_types.Generic_builders with type ('a, 's) t := ('a, 's) t with type 's state := 's with type 'a final := 'a
include State_transform_types.Generic_types with type ('a, 's) t := ('a, 's) t with type 's state := 's with type 'a final := 'a
val make : ('s -> 's * 'a) -> ('a, 's) t

make creates a context-sensitive computation that can modify both the current context and the data passing through.

Specialised builders

val peek : ('s -> 'a) -> ('a, 's) t

peek creates a context-sensitive computation that can look at the current context, but not modify it.

val modify : ('s -> 's) -> (Base.unit, 's) t

modify creates a context-sensitive computation that can look at and modify the current context.

val return : 'a -> ('a, 's) t

return lifts a value or monad into a stateful computation.

...as well as their runner functions...

include State_transform_types.Generic_runners with type ('a, 's) t := ('a, 's) t and type 'a final := 'a and type 's state := 's
include State_transform_types.Generic_types with type ('a, 's) t := ('a, 's) t with type 'a final := 'a with type 's state := 's
val run' : ('a, 's) t -> 's -> 's * 'a

run' unfolds a t into a function from context to final state and result.

val run : ('a, 's) t -> 's -> 'a

run unfolds a t into a function from context to final result. To get the final context, use run' or call peek at the end of the computation.

...and fixed-point combinators.

include State_transform_types.Fix with type ('a, 's) t := ('a, 's) t
val fix : f:(('a -> ('a, 's) t) -> 'a -> ('a, 's) t) -> 'a -> ('a, 's) t

fix ~f init builds a fixed point on f.

At each step, f is passed a continuation mu and a value a. It may choose to return a recursive application of mu, or some value derived from a.

To begin with, f is applied to mu and init.

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