NAME¶

std::deque::emplace_front - std::deque::emplace_front

Synopsis¶

template< class... Args > (since C++11)
void emplace_front( Args&&... args ); (until C++17)
template< class... Args > (since C++17)
reference 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)....

All iterators (including the end() iterator) are invalidated. No references are
invalidated.

Parameters¶

args - arguments to forward to the constructor of the element

Type requirements¶

-
T (the container's element type) must meet the requirements of EmplaceConstructible.

Return value¶

(none) (until C++17)
A reference to the inserted element. (since C++17)

Complexity¶

Constant.

Exceptions¶

If an exception is thrown for any reason, this function has no effect (strong
exception safety guarantee).

See also¶

push_front inserts an element to the beginning
(public member function)