is_unit()

bool RingZZ::is_unit ( const ring_elem f ) const

virtual

Implements Ring.

Definition at line 149 of file ZZ.cpp.

{
  mpz_srcptr a = f.get_mpz();
  return (mask_mpz_cmp_si(a, 1) == 0 || mask_mpz_cmp_si(a, -1) == 0);
}

References ring_elem::get_mpz(), and mask_mpz_cmp_si().

Referenced by invert(), and power().