C++ Vector Library - vector() Function

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Description

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

Declaration

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

C++11

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

Parameters

ilist − Initializer list to assign values to vector.

Return value

Constructor never returns value.

Exceptions

This member function never throws exception.

Time complexity

Linear i.e. O(n)

Example

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