std::deque::emplace_front
From cppreference.com
                    
                                        
                    
                    
                                                            
                    
| template< class... Args > void emplace_front( Args&&... args ); | (since C++11) | |
Inserts a new element to the beginning of the container. The element is constructed in-place, i.e. no copy or move operations are performed. The constructor of the element is called with exactly the same arguments, as supplied to the function.
| Contents | 
[edit] Parameters
| args | - | arguments to forward to the constructor of the element | 
[edit] Return value
(none)
[edit] Complexity
Constant.
[edit] Exceptions
If an exception is thrown, this function has no effect (strong exception guarantee).
[edit] See also
| inserts elements to the beginning (public member function) | 


