f#覆盖数组访问运算符.[]

Question

在F#,我想打一个类型索引数组,所以我可以通过访问该元素.[i]或.[index_names]通过与指数切片标志..是否有可能改写.[]这个样子？谢谢.

Answer 1

在您的类型中定义重载的索引器:

type MyIndexedArray<'T>() = 
    member this.Item(i : int) : 'T = Unchecked.defaultof<_>
    member this.Item(name : string) : 'T = Unchecked.defaultof<_>
    member this.GetSlice(a : int option, b : int option) : 'T = Unchecked.defaultof<_>

let arr = new MyIndexedArray<int>()
let a = arr.[1]
let b = arr.["name"]
let c = arr.[1..2]
let d = arr.[1..]
let e = arr.[..3]
let f = arr.[*]