From: Igor Pirnovar <lists@...>
Date: 2013-04-01T03:19:12+09:00
Subject: Re: Private setters can be called by self, why not getters?

You have to define setters and getters in ruby more carefully, when you
intend to use them as private methods! You have to separate what is
getter and what is setter, especially, when one and the same symbol can
be used for both operations simultaneously as is the case in combined
assignment operators such as +=, -=, *=, /= ...


Here is how you manage the getters and setters when setter but not
getter should be private:

  ---------------------------------------------------
  #!/usr/bin/env ruby
  class Counter
    attr_reader :count
    attr_writer :count
    private :count=

    def initialize; self.count = 0; end
    def show_count; puts "Count=#{count}"; end
    def increment1; self.count = count + 1; end
    def increment2; self.count = self.count + 1; end
    def increment3; self.count += 1; rescue; end
  end

  o = Counter.new
  o.show_count
  o.increment1
  o.show_count  #=> Count=0
  o.increment2
  o.show_count  #=> Count=1
  o.increment3
  o.show_count  #=> Count=2

  puts "Explicit get: Count=#{o.count}"  #=> Explicit get: Count=2
  o.count=1234
  ----------------------------------------------------

Indeed, if you do not care or are ignorant of oo, you can resort to
devices like the underscore as suggested above.

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