C++ Queues

The C++ Queue is a container adapter that gives the programmer a FIFO (first-in, first-out) data structure.

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Queue constructor construct a new queue
back returns a reference to last element of a queue
empty true if the queue has no elements
front returns a reference to the first element of a queue
pop removes the first element of a queue
push adds an element to the end of the queue
size returns the number of items in the queue