F＃中的类型继承 [英] Type inheritance in F#

问题描述

我找不到合适的语法来编码类型D，该类型D继承了基类B（用C＃编写）及其除基类隐式构造函数之外的构造函数：

I can't find the proper syntax for coding a type D that inherits a base class B (written in C#) and his constructors other than the base class implicit constructor:

C＃代码：

public class B
{
    private int _i;
    private float _f;
    public B()
    {
        _i = 0;
        _f = 0.0f;
    }
    public B(int i)
    {
        _i = 0;
        _f = 0.0f;
    }
    public B(int i, float f)
    {
        _i = i;
        _f = f;
    }
}

F＃代码：

type D() =
    inherit B()
    //how to inherit from other constructors ?

谢谢

推荐答案

由于这个博客！

type D =
    class
        inherit B

        new () = {
            inherit B()
        }
        new (i : int) = {
            inherit B(i)
        }
        new ((i,f) : int*single) = {
            inherit B(i, f)
        }
    end

是的，这有点麻烦，但就像Brian所说的那样，并不是大多数情况。

Yes, it's a bit cumbersome, but like Brian said it's not the majority of the cases.

编辑：
实际上，class / end关键字不是强制性的（因此，我收回了我所说的麻烦）。
正如Brian在其博客此处所述， F＃通常会推断所定义的类型，使这些令牌不必要/多余。

Actually, class/end keywords are not mandatory for that (so I take back what i said about cumbersomeness). As Brian said on his blog here, F# normally infers the kind of type being defined, making these tokens unnecessary/redundant.

type D =
    inherit B

    new () = {
        inherit B()
    }
    new (i : int) = {
        inherit B(i)
    }
    new ((i,f) : int*single) = {
        inherit B(i, f)
    }

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