    **/
    bool is_inf() const {
      if (cimg::type<T>::is_float()) cimg_for(*this,p,T) if (cimg::type<T>::is_inf((float)*p)) return true;
      return false;
    **/
    bool is_inf() const {
      if (cimg::type<T>::is_float()) cimg_for(*this,p,T) if (cimg::type<T>::is_inf((float)*p)) return true;
      return false;