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

C++ Vector Assign with Initializer List

The C++ function std::vector::assign() assign new values to the vector elements by replacing old ones. It modifies size of vector if necessary.

If memory allocation happens allocation is allocated by internal allocator.

New contents are the copies of values passed as initializer list, in the same order.

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

void assign (initializer_list<value_type> ilist);

ilist − Initializer list to assign values to vector.

None

This member function never throws exception.

Linear i.e. O(n)

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

#include <iostream>
#include <vector>

using namespace std;

int main(void) {
   /* Create empty vector */
   vector<int> v;
   /* create initializer list */
   auto il = {1, 2, 3, 4, 5};

   /* assign values from initializer list */
   v.assign(il);

  /* display vector elements */
  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

vector.htm

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