Pass an array pointer as an input to a function C++.

That's a really short post, but that's the second time I find it useful so I decided to keep it on my blog for future reference.

So let's assume that you have pointer to an array and you would like to use this array into a function. Here is an example of how to correctly send the pointers to avoid memory leaks:

#include < iostream >

void modifyData(unsigned int **i_array,unsigned int short i_len)
{
    (*i_array)[0] = 1;
    (*i_array)[2] = 2;
}

int main(int /*argc*/, char **/*argv*/)
{
  unsigned int short len = 5;
  unsigned int *mydata = new unsigned int[len];
  // initialise the values of the array
  for(unsigned int i=0; i < len; ++i)
  {
      mydata[i] = 0;
  }
  // print the original values of the array
  for(unsigned int i = 0; i < len; ++i)
  {
      std::cout << mydata[i] << " ";
  }
  std::cout << "\n";
  // call function that will modify the data
  modifyData(&mydata,len);
  // print the new values of the array
  for(unsigned int i = 0; i < len; ++i)
  {
      std::cout << mydata[i] << " ";
  }
  std::cout << "\n";
  delete []mydata;

  return 0;
}