std::stack<T,Container>::pop
From cppreference.com
                    
                                        
                    
                    
                                                            
                    
| void pop(); | ||
Removes the top element from the stack. Effectively calls c.pop_back()
Parameters
(none)
Return value
(none)
Complexity
Equal to the complexity of Container::pop_back.
See also
| (C++11) | constructs element in-place at the top (public member function) | 
| inserts element at the top (public member function) | |
| accesses the top element (public member function) |