Counter of mixed base

array_counter.rb

class RolloverIndex
  attr_accessor :max, :count
  
  def initialize max, start = 0
    self.max = max
    self.count = start
  end
	
  def inc
    if (self.count + 1) == max
      self.count = 0
      true
    else
      self.count = self.count + 1
      false
    end
  end
	
  def to_i
    count
  end

end

class ArrayCounter	
  attr_accessor :indices
	
  def initialize max_array
    self.indices = max_array.map{|max| RolloverIndex.new max }
  end
	
  def inc
    indices.length.times do |i|
      return indices unless indices[i].inc
    end
  end
	
end


@acounter = ArrayCounter.new [2,5]

	

10.times do |variable|
  puts @acounter.indices.map(&:to_i).inspect
  @acounter.inc
end

# => 
#[0, 0]
#[1, 0]
#[0, 1]
#[1, 1]
#[0, 2]
#[1, 2]
#[0, 3]
#[1, 3]
#[0, 4]
#[1, 4]