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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_vector_move_constructor.htm below:

C++ Vector Library - vector() Function

The C++ move constructor std::vector::vector() constructs the container with the contents of other using move semantics.

If alloc is not provided, allocator is obtained by move-construction from the allocator belonging to other.

Following is the declaration for move costructor std::vector::vector() form std::vector header.

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

x − Another vector container of same type.

Constructor never returns value.

This member function never throws exception.

Linear i.e. O(n)

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

#include <iostream>
#include <vector>

using namespace std;

int main(void) {
   /* create fill constructor */
   vector<int> v1(5, 123);

   cout << "Elements of vector v1 before move constructor" << endl;
   for (int i = 0; i < v1.size(); ++i)
      cout << v1[i] << endl;

   /* create constructor using move semantics */
   vector<int> v2(move(v1));

   cout << "Elements of vector v1 after move constructor" << endl;
   for (int i = 0; i < v1.size(); ++i)
      cout << v1[i] << endl;

   cout << "Element of vector v2" << endl;
   for (int i = 0; i < v2.size(); ++i)
      cout << v2[i] << endl;

   return 0;
}

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

Elements of vector v1 before move constructor
123
123
123
123
123
Elements of vector v1 after move constructor
Element of vector v2
123
123
123
123
123

vector.htm

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