Re: curiosity singleton pattern?

From:
"Alf P. Steinbach" <alfps@start.no>
Newsgroups:
comp.lang.c++
Date:
Wed, 01 Aug 2007 11:15:06 +0200
Message-ID:
<13b0jl2p6horaf6@corp.supernews.com>
* Chris Forone:

hello group,

cant understand the following:

Scene* Scene::sole(0); // in Scene.cpp

class Scene // singleton in Scene.h
{
  public:
    static Scene* Get()
    {
      //return sole ? sole : new (std::nothrow) Scene;
      return sole; // for testing purposes only
    }

    int Print(void) // normaly only with valid objects?!
    {
      return reinterpret_cast<unsigned int>(sole);
      // other values also possible (return 10;)
    }

  protected:
    Scene();
    ~Scene();

  private:
    static Scene* sole;
};

int main(void)
{
  std::cout << Scene::Get() << std::endl;
  std::cout << Scene::Get()->Print() << std::endl;
}

returns

0
0


What else did you expect, and why?

Have you tried, like, removing the out-commenting in Scene::Get?

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