#ifndef HAVE_USEFUL_FUNCTIONS_HH
#define HAVE_USEFUL_FUNCTIONS_HH

template <class T>
inline T max (const T &x1, const T &x2)
{
  return (x1 >= x2) ? x1 : (x2 < x1) ? x2 : 0;
}

sign (T x)
{
  return
    (0 < x) ? +1 :
    (0 > x) ? -1 :
    0;
}

#endif // HAVE_USEFUL_FUNCTIONS_HH