C++ :: Singleton Base Class - How To Implement GetInstance Function

I'm playing with the idea of a singleton base class, but I'm having an issue with how to implement the GetInstance() function in the base class. Since I'm trying to make this ridiculously simple for the child, I'd like to handle that in the base.

class Singleton {
private:
static Singleton* instance;
Singleton() { Construct(); } // Private to avoid other instances

[Code] .....

It would be easy to use like so:

class Hello : public Singleton {
private:
std::string hello;
void Construct() { hello = "hello"; }
public:
std::string GetHello() const { return hello; }
};

Then the instance would be handled like so:
std::cout << Hello::GetInstance()->GetHello();