.net - 如何在F#中具有两个相互递归的结构类型？

Question

以下代码无法编译:

[<Struct>]
type Point(x:int, y:int) =
    member __.X = x
    member __.Y = y
    member __.Edges = ArrayList<Edge>()
[<Struct>]
and Edge(target:Point, cost:int) =
    member __.Target = target
    member __.Cost = cost

问题出在 [<Struct>]属性上，该属性似乎与“and”结构冲突。

我应该怎么做呢？我知道我可以选择完成以下任务

type Point(x:int, y:int) =
    struct
        member __.X = x
        member __.Y = y
        member __.Edges = new ArrayList<Edge>()
    end
and Edge(target:Point, cost:int) =
    struct
        member __.Target = target
        member __.Cost = cost
    end

但我喜欢 [<Struct>]简洁。

谢谢

Answer 1

将属性定义移到and token 之后

and [<Struct>] Edge(target:Point, cost:int) =