特定通用类型的扩展方法 [英] Extension methods for specific generic types

问题描述

我尝试在F＃中为泛型绑定到特定泛型类型参数创建各种扩展方法，但该语言似乎并不允许我：

I'm attempting to create various extension method for a generic type bound to specific generic type parameters in F#, but the language does not seem to be allowing me:

我想要做的是如下所示：

What I want to do is something like the following:

type IEnumerable<int> with
    member this.foo =
        this.ToString()

然而，给出了编译器错误（在 int 关键字下面加上下划线）：

Yet it gives me the compiler error (underlining the int keyword):

类型名称。

Unexpected identifier in type name. Expected infix operator, quote symbol or other token.

以下确实可以起作用，虽然它并没有特别指出将泛型类型参数绑定到 int ，如我所愿：

The following does work, though it does not specifically bind the generic type parameter to int, as I want:

type IEnumerable<'a> with
    member this.foo =
        this.ToString()

任何方式来完成这个目标在F＃ - 我可能只是使用错误的语法？如果没有，我会很感激，如果有人可以建议一种解决方法，也许在某处使用类型约束。

Is there any way to accomplish this aim in F# - am I perhaps just using the wrong syntax? If not, I would appreciate if someone could suggest a workaround, perhaps using type constraints somewhere.

推荐答案

这是不可能的不幸的是，当前版本的F＃。请参阅相关问题此处。

This isn't possible in the current version of F#, unfortunately. See related question here.

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