How to call a non-const function within a const function (C++)

Question

I have a legacy function that looks like this:

int Random() const
{
  return var_ ? 4 : 0;
}

and I need to call a function within that lega

Answer 1

int Random() const
{
  return var_ ? const_cast(this)->newCall(4) : 0;
}

But it's not a good idea. Avoid if it's possible!