index_of_var()

int FractionField::index_of_var ( const ring_elem a ) const

virtual

Reimplemented from Ring.

Definition at line 286 of file frac.cpp.

{
  const frac_elem *f = FRAC_VAL(a);
  if (!R_->is_unit(f->denom))
    // If so, a cannot be a variable, otherwise, by 'simplify', f->denom == 1.
    return -1;
  return R_->index_of_var(f->numer);
}

References frac_elem::denom, FRAC_VAL, frac_elem::numer, and R_.