When is an integer<->pointer cast actually correct?

Question

The common folklore says that:

• The type system exists for a reason. Integers and pointers are distinct types, casting between them is a malpractice in the m

Answer 1

Storing a doubly linked list using half the space

A XOR Linked List combines the next and prev pointers into a single value of the same size. It does this by xor-ing the two pointers together, which requires treating them like integers.