Function Sign

Common/DataModel/vtkBoundingBox.cxx:22–26

namespace
{
inline double Sign(const double& a)
{
  // NOLINTNEXTLINE(readability-avoid-nested-conditional-operator)
  return a > 0.0 ? 1.0 : (a < 0 ? -1.0 : 0.0);
}
inline bool OppSign(const double& a, const double& b)
{
  return (a <= 0 && b >= 0) || (a >= 0 && b <= 0);