[英]Adding StructLayout attribute to F# type with implicit constructor
我有:
type Package =
abstract member Date : int
abstract member Save : unit -> unit
[<type:StructLayout(LayoutKind.Sequential, Pack=1, CharSet=CharSet.Ansi)>]
type Instant(date : int, value : int) =
let mutable _date = date
let mutable _value = value
member X.Value : int = _value
interface Package with
member X.Date : int = _date
member X.Save() = ...
但是獲得錯誤: 只有沒有隱式構造函數的結構和類可以被賦予'StructLayout'屬性
所以我意識到它必須是相似的東西:
type Instant =
struct
val Date : byte array
...
但是這樣我丟失了界面。 在C#中,例如添加type:StructLayout
對於這種類型的類,我可以使用type:StructLayout
(我認為)。 我如何重構代碼以避免此錯誤?
正如錯誤消息所述, StructLayout
應該與顯式構造函數一起使用 :
type Package =
abstract member Date : int
abstract member Save : unit -> unit
[<type:StructLayout(LayoutKind.Sequential, Pack=1, CharSet=CharSet.Ansi)>]
type Instant =
val mutable Date: int
val mutable Value: int
new(date, value) = {Date = date; Value = value}
interface Package with
member x.Date = x.Date
member x.Save() = x.Value |> ignore
如果您對FieldOffset
有任何進一步的問題,請在此處查看代碼示例。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.