如何在C++中编码乔恩?斯基特的Singleton?

论乔恩 site 他在C有一个非常优雅的设计,看起来像这样:

public sealed class Singleton
{
    Singleton()
    {
    }

    public static Singleton Instance
    {
        get
        {
            return Nested.instance;
        }
    }

    class Nested
    {
        // Explicit static constructor to tell C# compiler
        // not to mark type as beforefieldinit
        static Nested()
        {
        }

        internal static readonly Singleton instance = new Singleton();
    }
}

我想知道如何在C++中编写等价的代码?我有这个,但我不确定它是否真的有相同的功能,从乔恩。(顺便说一句,这只是周五的练习,不需要任何特别的练习)。

class Nested;

class Singleton
{
public:
  Singleton() {;}
  static Singleton& Instance() { return Nested::instance(); }

  class Nested
  { 
  public:
    Nested() {;}
    static Singleton& instance() { static Singleton inst; return inst; }
  };
};

...


Singleton S = Singleton::Instance();