Stack and Queue Adaptor Requirements

• Stack

PushBack(t) // used to define Push(t)
PopBack()   // used to define Pop()
Back()      // used to define Top()
Empty()     // used to define Empty()
Size()      // used to define Size()

• Queue

PushBack(t) // used to define Push(t)
PopFront()  // used to define Pop()
Front()     // used to define Front()
Empty()     // used to define Empty()
Size()      // used to define Size()