From: cibercitizen1 <CiberCitizen1@...>
Date: 2008-11-25T06:40:36+09:00
Subject: my attr_accessor

I tried to

class Foo
   attr_accessor  :bar1, :bar2

  def initialize( &bloc )
   instance_eval( &bloc )
  end
end

and then

f = Foo.new {
 bar1 = 12345
 bar2 = 44444
}

but this doesn't work
unless you write @bar1=12345 in the block, as
Ruby does not consider bar1= a method call but an assignment.

Here's my solution. Any comments?

#--------------------------------
module MyAccessor
  def my_attr (nou, defval=nil)
    class_eval "
      def #{nou} (s=nil)
        @#{nou} = s || @#{nou} || '#{defval}'
      end
      "
  end # def my_attr
end # module

#--------------------------------
class Foo

  extend MyAccessor

  my_attr(:title, "default title")
  my_attr(:height, 100)
  my_attr(:color, 'black')

  def initialize( &bloc )
    instance_eval( &bloc )
  end # def

  def show
    puts "attributes ----------"
    puts "title="+ title.to_s
    puts "color="+ color.to_s
    puts "height="+ height.to_s
  end

end

#----------------------------------
#----------------------------------
fo = Foo.new() {
  color "red"
  height 50
}

puts "---------------------------"
fo.show

puts "---------------------------"
fo.color("blue")
puts fo.color

puts "---------------------------"
fo.show