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Showing content from https://cplusplus.com/reference/deque/deque/deque/ below:

public member function

<deque>

std::deque::deque default (1)

explicit deque (const allocator_type& alloc = allocator_type());

fill (2)

explicit deque (size_type n, const value_type& val = value_type(),                const allocator_type& alloc = allocator_type());

range (3)

template <class InputIterator>  deque (InputIterator first, InputIterator last,         const allocator_type& alloc = allocator_type());

copy (4)

deque (const deque& x);

default (1)

explicit deque (const allocator_type& alloc = allocator_type());

fill (2)

explicit deque (size_type n);         deque (size_type n, const value_type& val,                const allocator_type& alloc = allocator_type());

range (3)

template <class InputIterator>  deque (InputIterator first, InputIterator last,         const allocator_type& alloc = allocator_type());

copy (4)

deque (const deque& x);deque (const deque& x, const allocator_type& alloc);

move (5)

deque (deque&& x);deque (deque&& x, const allocator_type& alloc);

initializer list (6)

deque (initializer_list<value_type> il,       const allocator_type& alloc = allocator_type());

default (1)

deque();explicit deque (const allocator_type& alloc);

fill (2)

explicit deque (size_type n, const allocator_type& alloc = allocator_type());         deque (size_type n, const value_type& val,                const allocator_type& alloc = allocator_type());

range (3)

template <class InputIterator>  deque (InputIterator first, InputIterator last,         const allocator_type& alloc = allocator_type());

copy (4)

deque (const deque& x);deque (const deque& x, const allocator_type& alloc);

move (5)

deque (deque&& x);deque (deque&& x, const allocator_type& alloc);

initializer list (6)

deque (initializer_list<value_type> il,       const allocator_type& alloc = allocator_type());

Construct deque container

Constructs a deque container object, initializing its contents depending on the constructor version used:

(1) empty container constructor (default constructor): Constructs an empty container, with no elements.
(2) fill constructor: Constructs a container with n elements. Each element is a copy if val.
(3) range constructor: Constructs a container with as many elements as the range [first,last), with each element constructed from its corresponding element in that range, in the same order.
(4) copy constructor: Constructs a container with a copy of each of the elements in x, in the same order.

The container keeps an internal copy of

alloc

, which is used to allocate storage throughout its lifetime. If no

alloc

argument is passed to the constructor, a default-constructed allocator is used, except in the following case:

- The copy constructor

(4)

creates a container that keeps and uses a copy of

's allocator.

The storage for the elements is allocated using this internal allocator.

(1) empty container constructor (default constructor): Constructs an empty container, with no elements.
(2) fill constructor: Constructs a container with n elements. Each element is a copy of val (if provided).
(3) range constructor: Constructs a container with as many elements as the range [first,last), with each element emplace-constructed from its corresponding element in that range, in the same order.
(4) copy constructor (and copying with allocator): Constructs a container with a copy of each of the elements in x, in the same order.
(5) move constructor (and moving with allocator): Constructs a container that acquires the elements of x.
If alloc is specified and is different from x's allocator, the elements are moved. Otherwise, no elements are constructed (their ownership is directly transferred).
x is left in an unspecified but valid state.
(6) initializer list constructor: Constructs a container with a copy of each of the elements in il, in the same order.

The container keeps an internal copy of

alloc

, which is used to allocate and deallocate storage for its elements, and to construct and destroy them (as specified by its

allocator_traits

). If no

alloc

argument is passed to the constructor, a default-constructed allocator is used, except in the following cases:

- The copy constructor

(4, first signature)

creates a container that keeps and uses a copy of the allocator returned by calling the appropriate

selected_on_container_copy_construction

trait on

's allocator.

- The move constructor

(5, first signature)

acquires

's allocator.

All elements are copied, moved or otherwise constructed by calling allocator_traits::construct with the appropriate arguments.

Parameters

alloc: Allocator object.
The container keeps and uses an internal copy of this allocator.
Member type allocator_type is the internal allocator type used by the container, defined in deque as an alias of its second template parameter (Alloc).
If allocator_type is an instantiation of the default allocator (which has no state), this is not relevant.
n: Initial container size (i.e., the number of elements in the container at construction).
Member type size_type is an unsigned integral type.
val: Value to fill the container with. Each of the n elements in the container will be initialized to a copy of this value.
Member type value_type is the type of the elements in the container, defined in deque as an alias of its first template parameter (T).
first, last: Input iterators to the initial and final positions in a range. The range used is [first,last), which includes all the elements between first and last, including the element pointed by first but not the element pointed by last.
The function template argument InputIterator shall be an input iterator type that points to elements of a type from which value_type objects can be constructed.
x: Another deque object of the same type (with the same class template arguments T and Alloc), whose contents are either copied or acquired.
il: An initializer_list object.
These objects are automatically constructed from initializer list declarators.
Member type value_type is the type of the elements in the container, defined in deque as an alias of its first template parameter (T).

Example

// constructing deques
#include <iostream>
#include <deque>

int main ()
{
  unsigned int i;

  // constructors used in the same order as described above:
  std::deque<int> first;                                // empty deque of ints
  std::deque<int> second (4,100);                       // four ints with value 100
  std::deque<int> third (second.begin(),second.end());  // iterating through second
  std::deque<int> fourth (third);                       // a copy of third

  // the iterator constructor can be used to copy arrays:
  int myints[] = {16,2,77,29};
  std::deque<int> fifth (myints, myints + sizeof(myints) / sizeof(int) );

  std::cout << "The contents of fifth are:";
  for (std::deque<int>::iterator it = fifth.begin(); it!=fifth.end(); ++it)
    std::cout << ' ' << *it;

  std::cout << '\n';

  return 0;
}

Output:

The contents of fifth are: 16 2 77 29

Complexity Constant for the default constructor (1), and for the move constructors (5) (unless alloc is different from x's allocator).
For all other cases, linear in the resulting container size.

Iterator validity The move constructors (5), invalidate all iterators, pointers and references related to x if the elements are moved.

Data races All copied elements are accessed.
The move constructors (5) modify x.

Exception safetyStrong guarantee: no effects in case an exception is thrown.
If allocator_traits::construct is not supported with the appropriate arguments for the element constructions, or if the range specified by [first,last) is not valid, it causes undefined behavior.

See also

deque::operator=: Assign content (public member function)

deque::assign: Assign container content (public member function)

deque::resize: Change size (public member function)

deque::clear: Clear content (public member function)

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