struct ListItem
{
    ListItem*   GetPrev     () { return nullptr; }
    ListItem*   GetNext     () { return nullptr; }
    // ... and many more
};
 
template <typename T>
struct ListItemT : ListItem
{
    T*    GetPrev () { return static_cast<T*>(ListItem::GetPrev()); }
    T*    GetNext () { return static_cast<T*>(ListItem::GetNext()); }
};
 
struct One : ListItemT<One>
{
};
 
class Two : public ListItemT<Two>
{
};
 
class Object : public One, public Two
{
};
 
int main() {
	Object o;
	One* prev = o.One::GetPrev();
	// your code goes here
	return 0;
}

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