C++ Vector Library - operator=() Function


Advertisements

Description

The C++ function std::vector::operator=() assign new contents to the vector by replacing old ones and modifies size if necessary.

Declaration

Following is the declaration for std::vector::operator=() function form std::vector header.

C++98

vector& operator = (const vector& x);

C++11

vector& operator = (const vector& x);

Parameters

x − another vector object of same type

Return value

Returns this pointer

Exceptions

This member function never throws exception.

Time complexity

Linear i.e. O(n)

Example

The following example shows the usage of std::vector::operator=() function.

#include <iostream>
#include <vector>

using namespace std;

int main(void) {
   vector<int> v1 = {1, 2, 3, 4, 5};
   vector<int> v2;

  /* assignment operator */
   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
Advertisements