package preface

  1. Overview
  2. Docs
package preface
Legend:
Page
Library
Module
Module type
Parameter
Class
Class type
Source

Source file indexed_functor.ml

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
module type LAWS = sig
  type ('a, 'index) t

  val functor_1 : unit -> (('a, 'index) t, ('a, 'index) t) Law.t

  val functor_2 :
    unit -> ('a -> 'b, ('c -> 'a) -> ('c, 'index) t -> ('b, 'index) t) Law.t
end

module For (F : Preface_specs.INDEXED_FUNCTOR) :
  LAWS with type ('a, 'index) t := ('a, 'index) F.t = struct
  open Law

  let functor_1 () =
    let lhs x = F.map Fun.id x
    and rhs x = x in

    law ("map id" =~ lhs) ("id" =~ rhs)
  ;;

  let functor_2 () =
    let open Preface_core.Fun.Infix in
    let lhs f g = F.map (f % g)
    and rhs f g = F.(map f % map g) in

    law ("map (f % g)" =~ lhs) ("(map f) % (map g)" =~ rhs)
  ;;
end
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