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chapter: private types #11

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mimoo opened this issue Jul 28, 2022 · 0 comments

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mimoo commented Jul 28, 2022 •

edited

can't construct the type manually (it's abstract)
but you can deconstruct it (it's not fully abstract)

module M : sig type t = private { a : int } val create : unit -> t end = struct type t = { a : int } let create () = { a = 5 } end
(* let a = { M.a = 5 }  <-- not gonna work *)
let a = M.create ();;
(* val a : M.t = {M.a = 5} *)
let M.{ a = b } = a
(* val b : int = 5 *)

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