Return an array in c++

Question

Suppose I have an array

int arr[] = {...};
arr = function(arr);

I have the function as

 int& function(int arr[])
 {
//         


        

Answer 1

Use std:: vector like this.

std::vector function(const std::vector& arr)
{
  return arr;
}

An array like

int arr[] = {...};

is not useful to be returned from a function because its not able to copy itself.