From: Austin Ziegler <halostatue@...>
Date: 2007-10-02T21:07:04+09:00
Subject: Re: canonical Array#append to hang hook

On 10/2/07, Lars Ticot <nicolas.rassat@free.fr> wrote:
> To Robert Klemme:
> Sure I can do this but this way I lose every benefit of inheritance! And
> I'll have to rewrite "accesor" function to access function to the
> instance variable array. That is not very DRY.

No you don't. #method_missing and #respond_to? are your friends. Or
you can use Delegator.

  class NRArray
    def initialize(*args, &block)
      @nrarray = if args.empty? and block.nil?
                   []
                 elsif args.empty?
                   Array.new &block
                 else
                   Array.new(*args, &block)
                 end
    end

    def respond_to?(sym)
      ok = super
      ok = @nrarray.respond_to?(sym) unless ok
      ok
    end

    def method_missing(sym, *args, &block)
      puts "#{sym}ing #{args.inspect}"
      @nrarray.send(sym, *args, &block)
    end
  end

(Note that NArray is a well-known numerical array extension, so Narray
is likely to be confusing if you need it.)

-austin
-- 
Austin Ziegler * halostatue@gmail.com * http://www.halostatue.ca/
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               * austin@zieglers.ca