我如何重载运营商在C＃中的枚举？ [英] How do I overload an operator for an enumeration in C#?

问题描述

我有一个枚举类型，我想定义>，＆LT;，> =，和＆lt; =运营商。我知道，这些运营商正在implictly枚举类型的基础上创建（根据的文档），但我想显式定义这些运营商（为清楚起见，控制，要知道怎么办呢，等...）

I have an enumerated type that I would like to define the >, <, >=, and <= operators for. I know that these operators are implictly created on the basis of the enumerated type (as per the documentation) but I would like to explictly define these operators (for clarity, for control, to know how to do it, etc...)

我希望我可以做这样的事情：

I was hoping I could do something like:

public enum SizeType
{
    Small = 0,
    Medium = 1,
    Large = 2,
    ExtraLarge = 3
}

public SizeType operator >(SizeType x, SizeType y)
{

}

但是，这似乎并没有工作（意外托克）...这可能吗？现在看来似乎应该是因为有implictly定义操作。有什么建议？

But this doesn't seem to work ("unexpected toke") ... is this possible? It seems like it should be since there are implictly defined operators. Any suggestions?

推荐答案

您不能这样做。你可以只提供重载运算符类和定义结构 - 和参数至少有一个应该是类型的类的或结构本身。也就是说，你的可以的声明重载加法操作，增加了一个 MyClass的到 MyEnum ，但你永远无法做到这一点与两个 MyEnum 值。

You can't do that. You can only provide overloaded operators for classes and structs you define -- and at least one of the parameters should be of type of the class or struct itself. That is, you can declare an overloaded addition operator that adds a MyClass to MyEnum but you can never do that with two MyEnum values.

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