Pops an element from the queue and returns a slice to that element. The value of the element must then be copied from the sliced location before the next push() or pop() is called.
pointer to the element popped from the queue or null if the queue is empty.
See Implementation
Pops an element from the queue and returns a slice to that element. The value of the element must then be copied from the sliced location before the next push() or pop() is called.