Module type Wtr.DecoderSource

All user defined decoders conform to the module signature decoder.

For e.g.

  module Fruit = struct
    type t =
      | Apple
      | Orange
      | Pineapple

    let t : t Wtr.decoder =
      Wtr.create_decoder ~name:"fruit" ~decode:(function
        | "apple" -> Some Apple
        | "orange" -> Some Orange
        | "pineapple" -> Some Pineapple
        | _ -> None)
  end