25     Pointers->Prev = P;  in addPointer()
27   P->Prev = nullptr;  in addPointer()
36   if (P->Prev)  in removePointer()
37     P->Prev->Next = P->Next;  in removePointer()
39     P->Next->Prev = P->Prev;  in removePointer()
50   To->Prev = From->Prev;  in movePointer()
51   if (To->Prev)  in movePointer()
52     To->Prev->Next = To;  in movePointer()
55     To->Next->Prev = To;  in movePointer()
59   From->Prev = nullptr;  in movePointer()
67     Root->Prev = this;  in DeadBlock()
70   Prev = nullptr;  in DeadBlock()
80   if (Prev)  in free()
81     Prev->Next = Next;  in free()
83     Next->Prev = Prev;  in free()