How to inherit from Ref properly?

@Greenhouse wrote:

What is the common pattern to derive from Ref without leaks?

Is the following snippet safe?

class Derived : public cocos2d::Ref
{
public:
    Derived () : x(0), y(0), z(nullptr) {}

    size_t                          x;    
    size_t                          y;  
    cocos2d::Sprite*                z;
};

Should I add destructor to Derived as well:

~Derived () 
{
    if (this->getReferenceCount() > 0)
        this->release();
}

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