power() [1/2]

ring_elem LocalRing::power ( const ring_elem f, int n ) const

virtual

Reimplemented from Ring.

Definition at line 543 of file localring.cpp.

{
  const local_elem *f = a.get_local_elem();
  ring_elem top, bottom;
  if (n >= 0)
    {
      top = mRing->power(f->numer, n);
      bottom = mRing->power(f->denom, n);
 
      if (mRing->is_zero(bottom)) return set_non_unit_frac(f->denom);
    }
  else
    {
      if (is_unit(a))
        {
          top = mRing->power(f->denom, -n);
          bottom = mRing->power(f->numer, -n);
        }
      else
        {
          throw exc::engine_error("attempt to divide by a non-unit");
        }
 
      if (mRing->is_zero(bottom)) return set_non_unit_frac(f->numer);
    }
  return ring_elem(make_elem(top, bottom));
}

References local_elem::denom, ring_elem::get_local_elem(), is_unit(), make_elem(), mRing, local_elem::numer, and set_non_unit_frac().