Unity3D，如何为运算符编写扩展方法？

Question

我正在尝试扩展 Vector3，这是一个 Unity3D 功能。它没有小于运算符，所以我正在尝试创建一个。但是，当我为其编写扩展方法时，我的 IDE 告诉我 "Identifier expected, 'this' is a keyword".

如何使用运算符编写扩展方法？这是我的尝试，没想到没有成功：

using UnityEngine;
using System.Collections;

public static class Vector3Extensions
{
    public static bool operator <(this Vector3 vector3, Vector3 other)
    {
        if (vector3.x < other.x)
        {
            return true;
        }
        else if (vector3.x > other.x)
        {
            return false;
        }
        else if (vector3.y < other.y)
        {
            return true;
        }
        else if (vector3.y > other.y)
        {
            return false;
        }
        else if (vector3.z < other.z)
        {
            return true;
        }
        return false;
    }
}

Answer 1

您不能使用扩展方法重载运算符。也许您可以添加 .LessThan.

Answer 2

这不是扩展方法而是运算符重载。请参阅此 MSDN documentation，其中指出：

==, !=, <, >, <=, >= The comparison operators can be overloaded (but see note below). Note The comparison operators, if overloaded, must be overloaded in pairs; that is, if == is overloaded, != must also be overloaded. The reverse is also true, and similar for < and >, and for <= and >=.

完成文档here。

Unity3D，如何为运算符编写扩展方法？

Unity3D, how can I write an extension method for operators?

c#

unity3d

operator-overloading

extension-methods