C++ Vector Library - operator=() Function

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Description

The C++ function std::vector::operator=() copy elements from initializer list to vector.

Declaration

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

C++11

vector& operator= (initializer_list<value_type> il);

Parameters

il − Initializer list object

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> v = {1, 2, 3, 4, 5};
   auto il = {1, 2, 3, 4, 5};

   /* assignment using move construct */
   v = il;

   for (int i = 0; i < v.size(); ++i)
      cout << v[i] << endl;

   return 0;
}

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

1
2
3
4
5