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Showing content from https://en.cppreference.com/w/cpp/algorithm/../ranges/../../cpp/container/deque/emplace_front.html below:

std::deque<T,Allocator>::emplace_front - cppreference.com

template< class... Args >
void emplace_front( Args&&... args );

(since C++11)
(until C++17)

template< class... Args >
reference emplace_front( Args&&... args );

(since C++17)
(constexpr since C++26)

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.

[edit] Parameters args - arguments to forward to the constructor of the element Type requirements -If T is not EmplaceConstructible into deque from args..., the behavior is undefined. [edit] Return value (none) (until C++17) A reference to the inserted element. (since C++17) [edit] Complexity

Constant.

[edit] Exceptions

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

[edit] See also

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