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

C++ Vector Library - vector() Function

The C++ copy constructor std::vector::vector() constructs a container with copy of each elements present in existing container x.

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

vector (const vector& x);

vector (const 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 copy constructor std::vector::vector().

#include <iostream>
#include <vector>

using namespace std;

int main(void) {
   vector<int> v1(5);

   /* assign value to vector v1 */
   for (int i = 0; i < v1.size(); ++i)
      v1[i] = i + 1;

   /* create a copy constructor v2 from v1 */
   vector<int> v2(v1);

   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 −

1
2
3
4
5

vector.htm

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