Macro fun with define method

macros_with_define_method.rb

#
# Ted Price
# Fun demo using define_method
#
class Base
  def self.has_a(*attrs)
    attrs.each do |attr|
      define_method(attr) do
        instance_variable_get("@#{attr}")
      end

      define_method("#{attr}=") do |val|
        instance_variable_set("@#{attr}", val)
      end
    end
  end
end

class Person < Base
  has_a :name
end

p = Person.new
p.name = "Ted"

p1 = Person.new
p1.name = "Greg"

# Anon
anon = Class.new(Base) { has_a :name, :age }.new
anon.name = "Jeah!"
anon.age = 35

puts p.name
puts p1.name
puts anon.name
puts anon.age