# File lib/aws/collections.rb, line 85
      def in_groups_of size, options = {}, &block

        group = []

        each_batch(options) do |batch|
          batch.each do |item|
            group << item
            if group.size == size
              yield(group)
              group = []
            end
          end
        end

        yield(group) unless group.empty?

        nil

      end