From: Brian Candler <B.Candler@...>
Date: 2003-02-22T21:38:17+09:00
Subject: Re: Style question: using 'block_given?'

Here's another one while we're on the subject of "consistent and
predictable" :-)

  class Tree
    @count = 0
    @@count = 50
    def Tree.inc
      @count += 1
    end
    def Tree.inc2
      @@count += 1
    end
  end

  def Tree.dec
    @count -= 1
  end
  def Tree.dec2
    @@count -= 1
  end

  puts Tree.inc    #>> 1
  puts Tree.inc2   #>> 51
  puts Tree.dec    #>> 0
  puts Tree.dec2   #>> uninitialized class variable @@count in Object (NameError)

(but in this case it's class variables, not class instance variables, which
appear to be behaving inconsistently)

Regards,

Brian.