template< class... Args >
void emplace_front( Args&&... args );
Inserts a new element to the beginning of the container. The element is constructed through std::allocator_traits::construct, which typically uses placement-new to construct the element in-place at the location provided by the container. The arguments
args... are forwarded to the constructor as std::forward<Args>(args)....
|args||-||arguments to forward to the constructor of the element|
 Return value
If an exception is thrown, this function has no effect (strong exception guarantee).
 See also
| inserts elements to the beginning
(public member function)