# File lib/RMagick.rb, line 1721
    def partition(&block)
      a = @images.partition(&block)
      t = self.class.new
      a[0].each { |img| t << img}
      t.set_current nil
      f = self.class.new
      a[1].each { |img| f << img}
      f.set_current nil
      [t, f]
    end