package eio

  1. Overview
  2. Docs
Effect-based direct-style IO API for OCaml

Install 

dune-project
 Dependency

github.com Readme Changelog ISC License Edit opam file Versions (22)

Authors

  1. A
    Anil Madhavapeddy
  2. T
    Thomas Leonard

Maintainers

  1. A
    anil@recoil.org

Sources

eio-1.5.tbz
sha256=7d70d1f5fb2b7190bf1ab28fffeb272da51ffe6d6c9c7c94e0485fabdf3b3fda
sha512=4582ac2fb2f8616b3d8ae9670eb7913a78085899b14044408801b30a34fed6c4d32971ba72eedb0cbc3d82c057610cf81c482090e75e2985330fcde96478ac5e

doc/src/eio/resource.ml.html

Source file resource.ml

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type ('t, 'impl, 'tags) pi = ..
type _ binding = H : ('t, 'impl, 'tags) pi * 'impl -> 't binding
type 't ops = 't binding array
type ('t, 'tags) handler = 't ops
type -'a t = T : ('t * 't ops) -> 'a t

let not_supported () = failwith "Operation not supported!"

let handler = Array.of_list
let bindings = Array.to_list

let get : 't ops -> ('t, 'impl, 'tags) pi -> 'impl = fun ops op ->
  let rec aux i =
    if i = Array.length ops then not_supported ();
    let H (k, v) = ops.(i) in
    if Obj.repr k == Obj.repr op then Obj.magic v
    else aux (i + 1)
  in
  aux 0

let get_opt : 't ops -> ('t, 'impl, 'tags) pi -> 'impl option = fun ops op ->
  let rec aux i =
    if i = Array.length ops then None
    else (
      let H (k, v) = ops.(i) in
      if Obj.repr k == Obj.repr op then Some (Obj.magic v)
      else aux (i + 1)
    )
  in
  aux 0

type close_ty = [`Close]
type (_, _, _) pi += Close : ('t, 't -> unit, [> close_ty]) pi

let close (T (t, ops)) = get ops Close t