Template class and inheritance

"Mr. Croup" <simon.hamelin@gmail.com>
14 May 2006 15:57:42 -0700
Hi, maybe someone can help with this one...

I have a templated singleton class from which some manager derives

    template<class S> class Singleton
        static S * SingletonInstance;
        static S* Instance()
            if (SingletonInstance == NULL)
                SingletonInstance = new S();

            return SingletonInstance;

Let's say I have one AbstractManager that derives from this singleton,
and a ConcreteManager that derives from AbstractManager. The only way
I found to make this work is having the AbstractManager be a template
class, like this :

    template<class R> class AbstractManager: public Singleton<R>
        friend class Singleton<R>;


    class ConcreteManager : public AbstractManager<OpenGLRenderer>
        friend class Singleton<OpenGLRenderer>;

Which is unfortunate because I can't declare non abstract virtual
methods in AbstractManager. I can't also have pointers to the base
AbstractManager class on the ConcreteClass. For example, with code
like this :

Core::AbstractManager<ConcreteManager> * Mgr =

The compiler complains with :

unresolved external symbol "public: void __thiscall

Even if the method was declared and implemented in AbstractManager.

So, how should I handle multi-level inheritance from a classe that is

Thanks! :)

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