Object Oriented Prime Generator

prime_generator.rb

class Prime
  def initialize()
    @value = 2
  end

  def value
    @value
  end

  def next
    i = @value
    while true
      i = i + 1
      break if is_prime?(i)
    end
    @value = i
    @value
  end

  private

  def is_prime?(n)
    (2..n/2).to_a.each do |divisor|
      return false if n % divisor == 0
    end
    true
  end
end