是F＃引用类型中的选项类型？

Question

是uint64选项类型的引用类型还是值类型？我遇到一些与此相关的性能问题。请澄清。

Answer 1

由于None被隐含地表示为null,Option是参考类型。

的F＃规范给出了需要的选项是一个引用类型定义如下：

[<DefaultAugmentation(false)>] 
[<CompilationRepresentation(CompilationRepresentationFlags.UseNullAsTrueValue)>]  
type 'T option = 
    | None 
    | Some of 'T 
    static member None : 'T option 
    static member Some : 'T -> 'T option 
    [<CompilationRepresentation(CompilationRepresentationFlags.Instance)>] 
    member Value : 'T 
    member IsSome : bool 
    member IsNone : bool  

Answer 2

type Option<'T> = 
     | None :  'T option 
     | Some : Value:'T -> 'T option 

从FSharp Source Code示出了被引用类型。