1

次のように、IEvent の上に追加のメソッドを必要とするインターフェイスを作成しようとしています。

type Varying<'t> = 
    abstract member Get : unit -> 't
    abstract member Set : 't -> unit
    abstract member AddHandler : Handler<'t> -> unit
    abstract member RemoveHandler : Handler<'t> -> unit
    member v.Add(f) = v.AddHandler(new Handler<_>(fun _ x -> f x))
    interface IEvent<'t> with
        member c.AddHandler(h) = c.AddHandler(h)
        member c.RemoveHandler(h) = c.RemoveHandler(h)
        member c.Add(f) = c.Add(f)

Get&Setメソッドを追加しました。問題は、F# コンパイラが抽象メンバーの実装を要求していることです。

「抽象メンバー Varying.AddHandler : Handler<'t> -> unit」の実装は指定されていません

しかし、このタイプのポイントは、メンバーが抽象的であることです。私は何を間違っていますか？

4

1 に答える 1

6

定義にラベルを追加でき[<AbstractClass>]ます。

> [<AbstractClass>]
- type Varying<'t> =
-     abstract member Get : unit -> 't
-     abstract member Set : 't -> unit
-     abstract member AddHandler : Handler<'t> -> unit
-     abstract member RemoveHandler : Handler<'t> -> unit
-     member v.Add(f) = v.AddHandler(new Handler<_>(fun _ x -> f x))
-     interface IEvent<'t> with
-         member c.AddHandler(h) = c.AddHandler(h)
-         member c.RemoveHandler(h) = c.RemoveHandler(h)
-         member c.Add(f) = c.Add(f)
- ;;

type Varying<'t> =
  class
    abstract member AddHandler : Handler<'t> -> unit
    abstract member Get : unit -> 't
    abstract member RemoveHandler : Handler<'t> -> unit
    abstract member Set : 't -> unit
    interface IEvent<'t>
    member Add : f:('t -> unit) -> unit
  end
于 2009-07-21T19:11:52.380 に答える