C++ Deque Library - deque() Function

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Description

The C++ move constructor std::deque::deque() constructs a deque with the contents of other using move semantics. Storage requirement for this container is fulfilled by internal allocator.

Declaration

Following is the declaration for std::deque::deque() constructor form std::deque header.

C++11

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

Parameters

• alloc − The allocator object.

• x − Another deque object of same type.

Return value

Constructor never returns value.

Exceptions

This member function never throws exception.

Time complexity

Linear i.e. O(n)

Example

The following example shows the usage of std::deque::deque() constructor.

#include <iostream>
#include <deque>

using namespace std;

int main(void) {

   deque<int> d1 = {1, 2, 3, 4, 5};
   deque<int> d2(move(d1));

   cout << "Size of deque d1 = " << d1.size() << endl;
   cout << endl;

   cout << "Contents of deque are" << endl;

   for (int i = 0; i < d2.size(); ++i)
      cout << d2[i] << endl; 

   return 0;
}

Let us compile and run the above program, this will produce the following result −

Size of deque d1 = 0

Contents of deque are
1
2
3
4
5