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

C++ Vector Library - vector() Function

The C++ initializer list constructor std::vector::vector() constructs a container from initializer list.

Following is the declaration for initializer list constructor std::vector::vector() form std::vector header.

vector (initializer_list<value_type> ilist, const allocator_type&
   alloc = allocator_type());

ilist − Initializer list to assign values to vector.

Constructor never returns value.

This member function never throws exception.

Linear i.e. O(n)

The following example shows the usage of initializer list constructor std::vector::vector().

#include <iostream>
#include <vector>

using namespace std;

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

vector.htm

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