T&       AddHead(T *newt)              { bv.AddHead(newt); return *newt; }
	T&       AddTail(T *newt)              { bv.AddTail(newt); return *newt; }
	template <class TT> TT& CreateHead()   { TT *q = new TT; bv.AddHead(q); return *q; }
	template <class TT> TT& CreateTail()   { TT *q = new TT; bv.AddTail(q); return *q; }
	T       *DetachHead()                  { T *q = (T*) bv.Head(); bv.DropHead(); return q; }
	T       *DetachTail()                  { T *q = (T*) bv.Tail(); bv.DropTail(); return q; }