24 Containers library [containers]

24.3 Sequence containers [sequences]

24.3.9 Class template deque [deque]

24.3.9.2 Constructors, copy, and assignment [deque.cons]

explicit deque(const Allocator&);
Effects: Constructs an empty deque, using the specified allocator.
Complexity: Constant.
explicit deque(size_type n, const Allocator& = Allocator());
Preconditions: T is Cpp17DefaultInsertable into deque.
Effects: Constructs a deque with n default-inserted elements using the specified allocator.
Complexity: Linear in n.
deque(size_type n, const T& value, const Allocator& = Allocator());
Preconditions: T is Cpp17CopyInsertable into deque.
Effects: Constructs a deque with n copies of value, using the specified allocator.
Complexity: Linear in n.
template<class InputIterator> deque(InputIterator first, InputIterator last, const Allocator& = Allocator());
Effects: Constructs a deque equal to the range [first, last), using the specified allocator.
Complexity: Linear in distance(first, last).
template<container-compatible-range<T> R> deque(from_range_t, R&& rg, const Allocator& = Allocator());
Effects: Constructs a deque with the elements of the range rg, using the specified allocator.
Complexity: Linear in ranges​::​distance(rg).