==========C++ Stacks==========

The C++ Stack is a container adapter that gives the programmer the
functionality of a stack -- specifically, a FILO (first-in, last-out) data
structure.

|[[stack_constructors|Constructors]]|construct a new stack|
|[[empty]]|true if the stack has no elements|
|[[pop]]|removes the top element of a stack|
|[[push]]|adds an element to the top of the stack|
|[[size]]|returns the number of items in the stack|
|[[top]]|returns the top element of the stack|