Scala等价于C#的扩展方法? [英] Scala equivalent of C#’s extension methods?

问题描述

在C#中，您可以编写:

In C# you can write:

using System.Numerics;
namespace ExtensionTest {
public static class MyExtensions {
    public static BigInteger Square(this BigInteger n) {
        return n * n;
    }
    static void Main(string[] args) {
        BigInteger two = new BigInteger(2);
        System.Console.WriteLine("The square of 2 is " + two.Square());
    }
}}

这种简单的扩展方法在Scala中的外观如何?

How would this simple extension method look like in Scala?

推荐答案

皮条客我的图书馆模式是类似的构造:

object MyExtensions {
  implicit def richInt(i: Int) = new {
    def square = i * i
  }
}


object App extends Application {
  import MyExtensions._

  val two = 2
  println("The square of 2 is " + two.square)

}

---

根据@Daniel Spiewak的评论，这将避免对方法调用的反思，从而有助于提高性能:

---

Per @Daniel Spiewak's comments, this will avoid reflection on method invocation, aiding performance:

object MyExtensions {
  class RichInt(i: Int) {
    def square = i * i
  }
  implicit def richInt(i: Int) = new RichInt(i)
}

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