23 Containers library [containers]

23.3 Sequence containers [sequences]

23.3.5 Class template deque [deque]

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

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