From: "Brian Schröder" <ruby.brian@...>
Date: 2005-08-13T00:22:33+09:00
Subject: Re: eval, attr_* like methods

On 12/08/05, Patrick Gundlach <clr7.10.randomuser@spamgourmet.com> wrote:
> Dear all,
> 
> I'd like to create methods similar to the attr_* way. I'd like to
> write
> 
> class Foo
>   lookup_meth :bar, :baz
> 
>   def some_other_methods
>       ....
>   end
> 
> end
> 
> The lookup_meth should define for class Foo methods such as
> 
> def bar
>   # tricky lookup stuff
>   return value
> end
> def bar=(obj)
>   @bar=obj
> end
> 
> 
> How would I write such lookup_meth? I've been playing a bit with eval,
> but I didn't get it quite right.
> 
> Patrick
> 
> 

class Object
  def self.lookup_meth(*args)
    args.each do | name |
      eval %(
      def #{name}
	@#{name} ||= '24'
      end

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

class Test
  lookup_meth :test1, :test2

  def testme
    p self.test1
    self.test1 = 42
    p self.test1
  end
end

Test.new.testme
=> 
"24"
42

Hope that helps,

Brian

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