C++ (Cpp) CGAL_error Examples

Example #1

File: test_p2t2_triangulation_point_location.cpp Project: grzjab/cgal

Face_handle test_point_location(const Triangulation &t,
                                const Point &query,
                                const Triangulation::Locate_type &lt_in)
{
  Triangulation::Locate_type lt, lt2;
  int li, li2;
  Face_handle fh;
  CGAL::Bounded_side bs;
  CGAL::Oriented_side os;

  fh = t.locate(query, lt, li);
  CGAL_assertion(lt == lt_in);
  if (lt_in == Triangulation::EMPTY) {
    CGAL_assertion(fh == Face_handle());
    return fh;
  }

  bs = t.side_of_face(query, fh, lt2, li2);
  os = t.oriented_side(fh, query);
  CGAL_USE(bs);
  CGAL_USE(os);
  
  CGAL_assertion(lt2 == lt_in);

  switch (lt_in)
    {
    case Triangulation::VERTEX:
    case Triangulation::EDGE:
    {
      CGAL_assertion(fh != Face_handle());
      CGAL_assertion(bs == CGAL::ON_BOUNDARY);
      CGAL_assertion(os == CGAL::ON_ORIENTED_BOUNDARY);

      CGAL_assertion(li == li2);
      break;
    }
    case Triangulation::FACE:
    {
      CGAL_assertion(fh != Face_handle());
      CGAL_assertion(bs == CGAL::ON_BOUNDED_SIDE);
      CGAL_assertion(os == CGAL::ON_POSITIVE_SIDE);
      break;
    }
    case Triangulation::EMPTY:
    {
      // Handled above
      CGAL_assertion(false);
      break;
    }
    case Triangulation::OUTSIDE_CONVEX_HULL: CGAL_error();
    case Triangulation::OUTSIDE_AFFINE_HULL: CGAL_error();
    }

  return fh;
}

Example #2

File: MP_Float.cpp Project: mvdan/geoc-viewer

// Squaring simplifies things and is faster, so we specialize it.
MP_Float
INTERN_MP_FLOAT::square(const MP_Float &a)
{
  // There is a bug here (see test-case in test/NT/MP_Float.C).
  // For now, I disable this small optimization.
  // See also the comment code in operator*().
  return a*a;
#if 0
  typedef MP_Float::limb limb;
  typedef MP_Float::limb2 limb2;

  if (a.is_zero())
    return MP_Float();

  MP_Float r;
  r.exp = 2*a.exp;
  r.v.assign(2*a.v.size(), 0);
  for(unsigned i=0; i<a.v.size(); i++)
  {
    unsigned j;
    limb2 carry = 0;
    limb carry2 = 0;
    for(j=0; j<i; j++)
    {
      // There is a risk of overflow here :(
      // It can only happen when a.v[i] == a.v[j] == -2^15 (log_limb...)
      limb2 tmp0 = std::multiplies<limb2>()(a.v[i], a.v[j]);
      limb2 tmp1 = carry + (limb2) r.v[i+j] + tmp0;
      limb2 tmp = tmp0 + tmp1;

      limb tmpcarry;
      MP_Float::split(tmp, tmpcarry, r.v[i+j]);
      carry = tmpcarry + (limb2) carry2;

      // Is there a more efficient way to handle this carry ?
      if (tmp > 0 && tmp0 < 0 && tmp1 < 0)
      {
        // If my calculations are correct, this case should never happen.
	CGAL_error();
      }
      else if (tmp < 0 && tmp0 > 0 && tmp1 > 0)
        carry2 = 1;
      else
        carry2 = 0;
    }
    // last round for j=i :
    limb2 tmp0 = carry + (limb2) r.v[i+i]
                       + std::multiplies<limb2>()(a.v[i], a.v[i]);
    MP_Float::split(tmp0, r.v[i+i+1], r.v[i+i]);
    r.v[i+i+1] += carry2;
  }
  r.canonicalize();
  return r;
#endif
}