std::stack::empty
From cppreference.com
                    
                                        
                    
                    
                                                            
                    
| bool empty() const; | ||
Checks if the underlying container has no elements, i.e. whether c.empty().
| Contents | 
[edit] Parameters
(none)
[edit] Return value
true if the underlying container is empty, false otherwise
[edit] Complexity
Constant
[edit] See also
| returns the number of elements (public member function) | 


