歧视联盟结构/习惯平等

Question

我有以下歧视联盟:

type ActCard = Cellar of card list 
                | Chapel of (card option * card option* card option* card option) 
                | Smithy | Spy of (card -> bool * card -> bool)

它有结构平等,直到我添加card -> bool到Spy.此问题有助于如何为记录执行自定义相等.但是,我不确定在这种情况下如何最好地实现它.我宁愿不必列举每个案例ActCard:

override x.Equals(yobj) =
    match x, yobj with
    |  Spy _, Spy _ -> true
    |  Cellar cards, Cellar cards2 -> cards = cards2
    (* ... etc *)

这里有什么更好的方法？

Answer 1

没有更好的方法.如果你不打算使用默认的结构相等,那么你必须拼出相等的语义.

编辑

你可以这样做.

[<CustomEquality; CustomComparison>]
type SpyFunc = 
  | SpyFunc of (card -> bool * card -> bool) 
  override x.Equals(y) = (match y with :? SpyFunc -> true | _ -> false)
  override x.GetHashCode() = 0
  interface System.IComparable with
    member x.CompareTo(y) = (match y with :? SpyFunc -> 0 | _ -> failwith "wrong type")

type ActCard = 
  | Cellar of card list 
  | Chapel of (card option * card option * card option * card option) 
  | Smithy 
  | Spy of SpyFunc