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如何在f中使用其他方法创建接口#

typing interface f# .net

1

Jules · 技术社区 · 15 年前

我正在尝试创建一个接口,它需要IEvent之上的其他方法,如:

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)

我添加了 Get 和; Set 方法。问题是f编译器希望我实现抽象成员:

没有为“abstract member varying.addhandler:handler<'t>->Unit”提供任何实现

但这种类型的要点是成员是抽象的。我做错什么了?

1 回复 | 直到 15 年前

1

6

ssp 15 年前

您可以添加 [<AbstractClass>] 定义标签:

> [<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