exception handling for int overflow

[mzimmers]

SIK: yes, that was the question.

[SIK]

Then will the following modification to Cubbis function also not work for you?

int mypow(int n, int p)
{
   if (p < 0)     throw std::runtime_error("negative powers not allowed");
   if (p == 0)    return 1;
   if (p == 1)    return n;

   double f = pow(n, p);
   int z = (int)f;

   if (f != (double)z)     throw std::overflow_error("result overflow error in int");
   return z;
}