< cpp‎ | container‎ | deque
template< class... Args >
iterator emplace( const_iterator pos, Args&&... args );
(since C++11)

Inserts a new element into the container directly before pos. The element is constructed in-place, i.e. no copy or move operations are performed. The constructor of the element is called with the arguments std::forward<Args>(args).... The element type must be EmplaceConstructible, MoveInsertable and MoveAssignable.

All iterators, including the past-the-end iterator, are invalidated. References are invalidated too, unless pos == begin() or pos == end(), in which case they are not invalidated.


[edit] Parameters

pos - iterator before which the new element will be constructed
args - arguments to forward to the constructor of the element

[edit] Return value

Iterator pointing to the emplaced element.

[edit] Complexity

Linear in the lesser of the distances between pos and either of the ends of the container.

[edit] Exceptions

If an exception is thrown (e.g. by the constructor), the container is left unmodified, as if this function was never called (strong exception guarantee).

[edit] See also

inserts elements
(public member function) [edit]