copy constructor for vector c++
// C++ code to demonstrate copy of vector
// by constructor method.
#include<bits/stdc++.h>
using namespace std;
int main()
{
// Initializing vector with values
vector<int> vect1{1, 2, 3, 4};
// Declaring new vector and copying
// element of old vector
// constructor method, Deep copy
vector<int> vect2(vect1);
cout << "Old vector elements are : ";
for (int i=0; i<vect1.size(); i++)
cout << vect1[i] << " ";
cout << endl;
cout << "New vector elements are : ";
for (int i=0; i<vect2.size(); i++)
cout << vect2[i] << " ";
cout<< endl;
// Changing value of vector to show that a new
// copy is created.
vect1[0] = 2;
cout << "The first element of old vector is :";
cout << vect1[0] << endl;
cout << "The first element of new vector is :";
cout << vect2[0] <<endl;
return 0;
}