C++ Vector Library - operator=() Function

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Description

The C++ function std::vector::operator=() move the contents of one vector into another and modifies size if necessary.

Declaration

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

C++98

vector& operator= (vector&& x);

Parameters

x − another vector container 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 using move construct */
   v2 = move(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