    CImg<T> get_fill(const char *const expression, const bool repeat_values, const bool allow_formula=true,
                     CImgList<T> *const list_images=0) const {
      return (+*this).fill(expression,repeat_values,allow_formula?1:0,list_images);
    }
    CImg<T> get_fill(const char *const expression, const bool repeat_values, const bool allow_formula=true,
                     CImgList<T> *const list_images=0) const {
      return (+*this).fill(expression,repeat_values,allow_formula?1:0,list_images);
    }