Re: Template<void>

In another thread, someone asked about code like this:

[begin]
class callbackbase {
public:
    virtual void operator()() const { };
    virtual ~callbackbase() = 0;
};
callbackbase::~callbackbase() { }

template < class T >
class callback : public callbackbase {
public:
    typedef void (T::*Func)();
    callback( T& t, Func func ) : object(&t), f(func) { }
    void operator()() const { (object->*f)(); }
private:
    T* object;
    Func f;
};
[end]

The name "callbackbase" is used for the base class,
just to factor out the non-template parts.