From: Gavin Sinclair <gsinclair@...>
Date: 2003-01-13T00:08:24+09:00
Subject: Re: Instance vars as arguments to initialize()?

On Monday, January 13, 2003, 12:11:34 AM, Gavin wrote:

> Now, even though it's untested, I'm pretty sure it wouldn't work, cos
> I left a hole for you to fill :)  (i.e. I started it and it became too
> hard)

OK, I've done it.  Run this:

   class Class

     # Define initialize in terms of the symbols contained in *syms.
     # e.g. autoinit :a, :b   =>
     #   def initialize(a, b)
     #     @a = a
     #     @b = b
     #   end
     def autoinit(*syms)
       vars = syms.map { |s| s.to_s }
       params = vars.join ","
       body = vars.map { |v| "@#{v} = #{v}"}.join "; "
       code = <<-EOF
         def initialize(#{params})
           #{body}
         end
       EOF

       module_eval code
     end

   end


   class Example
     autoinit :a, :b, :c
   end

   p Example.new(1,2,3)



And then check out www.ruby-talk.org/11663, where I've just realised
Avi has done the same thing but better.

Gavin