grid (Prawn::Document)

    # File lib/prawn/layout/grid.rb, line 16
        def grid(*args)
          @boxes ||= {}
          @boxes[args] ||= if args.empty?
            @grid
          else
            g1, g2 = args
            if(g1.class == Array && g2.class == Array &&
              g1.length == 2 && g2.length == 2)
              multi_box(single_box(*g1), single_box(*g2))
            else
              single_box(g1, g2)
            end
          end
        end