Accessors with class_eval

creating_an_accessor_with_class_eval.rb

module Accessor
  def my_attr_accessor(*names)
    names.each do |name|
      class_eval %{
        def #{name}
          @#{name}
        end

        def #{name}=(val)
          @#{name} = val
        end
      }
    end 
  end 
end

class Foo 
  extend Accessor

  my_attr_accessor :val, :bar
end

f = Foo.new
f.val = 1 
f.bar = 2 

puts "val: #{f.val}"
puts "bar: #{f.bar}"