std::deque::push_front

From cppreference.com
< cpp‎ | container‎ | deque

void push_front( const T& value );
void push_front( T&& value );
(since C++11)

Prepends the given element value to the beginning of the container.

All iterators, including the past-the-end iterator, are invalidated. No references are invalidated.

Parameters

value - the value of the element to prepend

Return value

(none)

Complexity

Constant.

Exceptions

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

See also

constructs an element in-place at the beginning
(public member function)
adds an element to the end
(public member function)
removes the first element
(public member function)