Hello, World!

Initial State:
Size:  0
Empty: true
Valid: true
Front: 0 (0)
Back:  0 (0)
Data:

pop_back() on empty deque
Size:  0
Empty: true
Valid: true
Front: 0 (0)
Back:  0 (0)
Data:

pop_front() on empty deque
Size:  0
Empty: true
Valid: true
Front: 0 (0)
Back:  0 (0)
Data:

push_front() on empty deque
Size:  1
Empty: false
Valid: true
Front: 1 (0x6000128b0)
Back:  1 (0x6000128b0)
Data:  [(1)]

pop_back() on deque of size 1
Size:  0
Empty: true
Valid: true
Front: 0 (0)
Back:  0 (0)
Data:

push_front() on empty deque (again)
Size:  1
Empty: false
Valid: true
Front: 1 (0x6000128c0)
Back:  1 (0x6000128c0)
Data:  [(1)]

push_front() on deque of size 1
Size:  2
Empty: false
Valid: true
Front: 2 (0x600012920)
Back:  1 (0x6000128c0)
Data:  [2] (1)

adding extra entries using push_front()
Size:  3
Empty: false
Valid: true
Front: 3 (0x6000128e0)
Back:  1 (0x6000128c0)
Data:  [3] 2 (1)

pop_front() on deque with a size greater than 1
Size:  2
Empty: false
Valid: true
Front: 2 (0x600012920)
Back:  1 (0x6000128c0)
Data:  [2] (1)

pop_back() on deque with a size greater than 1
Size:  1
Empty: false
Valid: true
Front: 2 (0x600012920)
Back:  2 (0x600012920)
Data:  [(2)]

reset deque to be empty
Size:  0
Empty: true
Valid: true
Front: 0 (0)
Back:  0 (0)
Data:

push_back() on empty deque
Size:  1
Empty: false
Valid: true
Front: 1 (0x6000128b0)
Back:  1 (0x6000128b0)
Data:  [(1)]

push_back() on deque of size 1
Size:  2
Empty: false
Valid: true
Front: 1 (0x6000128b0)
Back:  2 (0x6000128d0)
Data:  [1] (2)

push_back() on deque with a size greater than 1
Size:  3
Empty: false
Valid: true
Front: 1 (0x6000128b0)
Back:  3 (0x6000128f0)
Data:  [1] 2 (3)