A problem with GenLinearHierarchy from A

Hi,

I am studying Andrei Alexandrescu's Modern C++ Design book and cannot access the OnEvent(Button&, int) implementation of:

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using linear = Loki::GenLinearHierarchy<TYPELIST_3(Window, Button, Scrollbar), EventHandler >;
linear lin;

I can access for Window like this:

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Window win;
lin.OnEvent(win, 55);

but the other virtual functions generated in the hierarchy are not available...
Why? How can I access them?

Regards

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