ruby_simple_delegate.rb

require 'delegate'

class Person
  attr_accessor :fname, :lname

  def category
    'manav'
  end
end

class Male < Person
  def category
    'vale'
  end
end

class Female < Person
  def category
    'pothi'
  end
end

class DecoratedPerson < SimpleDelegator
  def initialize
    @sexes = [Male.new, Female.new].cycle
    super(Person.new)
  end

  def full_name
    fname.to_s + ' ' + lname.to_s
  end

  def change_sex
    __setobj__ @sexes.next
  end

end

p = DecoratedPerson.new
puts p.category # 'manav'
p.change_sex
puts p.category # 'vale'
p.change_sex
puts p.category # 'pothi'
p.change_sex
puts p.category # 'vale'