From: Ralph Shnelvar <ralphs@...32.com>
Date: 2012-02-21T15:31:53+09:00
Subject: Re: Metaprograming question about initialize

Bartosz,

Monday, February 20, 2012, 10:19:41 AM, you wrote:

BD> 2012/2/20 Ralph Shnelvar <ralphs@dos32.com>:
>>
>> What I want to do is not change the interface but the implementation.  That is, I want to get a list of the names of the arguments by introspection.

BD> It is much simpler and IMO makes much more sense not to figure out
BD> variable names while already having variables, but to figure out their
BD> contents while having names. Like this:

BD> class Class
BD>   def attr_accessor_init *meths
BD>     attr_accessor *meths
BD>     define_method :initialize do |*args|
BD>       meths.each_with_index do |m, i|
BD>         self.send :"#{m}=", args[i]
BD>       end
BD>     end
BD>   end
BD> end

irb(main):013:0>> class A
irb(main):014:1>> attr_accessor_init :a, :b, :c
irb(main):015:1>> end

irb(main):029:0>> A.new 4, 6, 8
=>> #<A:0xd6cb18 @a=4, @b=6, @c=8>


BD> (This is, essentially, what Struct class does.)

BD> -- Matma Rex

This is an elegant solution.

Not quite what I wanted .... but I learned a lot from it.

Thank you.