[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() = ...
但是获得错误: 只有没有隐式构造函数的结构和类可以被赋予'StructLayout'属性
所以我意识到它必须是相似的东西:
type Instant =
struct
val Date : byte array
...
但是这样我丢失了界面。 在C#中,例如添加type:StructLayout
对于这种类型的类,我可以使用type:StructLayout
(我认为)。 我如何重构代码以避免此错误?
正如错误消息所述, StructLayout
应该与显式构造函数一起使用 :
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
如果您对FieldOffset
有任何进一步的问题,请在此处查看代码示例。
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