Re: looking for an "inversion" pattern

Path	csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!aioe.org!feeder.news-service.com!de-l.enfer-du-nord.net!feeder1.enfer-du-nord.net!feeder2.enfer-du-nord.net!talisker.lacave.net!lacave.net!not-for-mail
From	Kevin Mahler <kevin.mahler@yahoo.com>
Newsgroups	comp.lang.ruby
Subject	Re: looking for an "inversion" pattern
Date	Fri, 15 Apr 2011 02:14:37 -0500
Organization	Service de news de lacave.net
Lines	47
Message-ID	<fe2a1539e193df32600e0c6768313e7e@ruby-forum.com> (permalink)
References	<d0c168880ff1c65dd84fc6d70778ddb2@ruby-forum.com>
NNTP-Posting-Host	bristol.highgroove.com
Content-Type	text/plain; charset=UTF-8
Content-Transfer-Encoding	7bit
X-Trace	talisker.lacave.net 1302851695 56891 65.111.164.187 (15 Apr 2011 07:14:55 GMT)
X-Complaints-To	abuse@lacave.net
NNTP-Posting-Date	Fri, 15 Apr 2011 07:14:55 +0000 (UTC)
In-Reply-To	<d0c168880ff1c65dd84fc6d70778ddb2@ruby-forum.com>
X-Received-From	This message has been automatically forwarded from the ruby-talk mailing list by a gateway at comp.lang.ruby. If it is SPAM, it did not originate at comp.lang.ruby. Please report the original sender, and not us. Thanks! For more details about this gateway, please visit: http://blog.grayproductions.net/categories/the_gateway
X-Mail-Count	381611
X-Ml-Name	ruby-talk
X-Rubymirror	Yes
X-Ruby-Talk	<fe2a1539e193df32600e0c6768313e7e@ruby-forum.com>
Xref	x330-a1.tempe.blueboxinc.net comp.lang.ruby:2921

Show key headers only | View raw

Fearless Fool wrote in post #992929:
> I'd like to create a method +foo+ that transforms:
>
>    my_obj.foo.some_method(*args)
>
> to
>
>   MyClass.some_method(my_obj, *args)

  class MyClass
    def self.some_method(obj, *args)
      puts "MyClass.some_method:"
      puts "obj: #{obj.inspect}"
      puts "args: #{args.inspect}"
    end
  end

  def define_foo(obj, clazz, method)
    obj.singleton_class.class_eval do
      define_method :foo do
        Class.new do
          define_method method do |*args|
            clazz.send(method, obj, *args)
          end
        end.new
      end
    end
  end

  my_obj = "my_obj thing"
  args = [1,2,3]
  define_foo(my_obj, MyClass, :some_method)
  my_obj.foo.some_method(*args)

  # =>
  # MyClass.some_method:
  # obj: "my_obj thing"
  # args: [1, 2, 3]

Returning facade or proxy objects like this can be an elegant solution 
to certain problems. It's rather high on the abstraction ladder, though, 
and without knowing the context I would wonder if more direct solutions 
are possible.

-- 
Posted via http://www.ruby-forum.com/.

Thread

looking for an "inversion" pattern Fearless Fool <r@alum.mit.edu> - 2011-04-15 00:16 -0500
  Re: looking for an "inversion" pattern Fearless Fool <r@alum.mit.edu> - 2011-04-15 01:27 -0500
    Re: looking for an "inversion" pattern Robert Klemme <shortcutter@googlemail.com> - 2011-04-15 04:24 -0500
      Re: looking for an "inversion" pattern Fearless Fool <r@alum.mit.edu> - 2011-04-15 10:40 -0500
        Re: looking for an "inversion" pattern Robert Klemme <shortcutter@googlemail.com> - 2011-04-16 15:29 +0200
  Re: looking for an "inversion" pattern Kevin Mahler <kevin.mahler@yahoo.com> - 2011-04-15 02:14 -0500
    Re: looking for an "inversion" pattern Fearless Fool <r@alum.mit.edu> - 2011-04-15 02:43 -0500
      Re: looking for an "inversion" pattern Kevin Mahler <kevin.mahler@yahoo.com> - 2011-04-15 08:44 -0500
    Re: looking for an "inversion" pattern 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-16 13:20 -0500
      Re: looking for an "inversion" pattern 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-16 13:43 -0500
  Re: looking for an "inversion" pattern Jesús Gabriel y Galán <jgabrielygalan@gmail.com> - 2011-04-15 02:45 -0500
  Re: looking for an "inversion" pattern Brian Candler <b.candler@pobox.com> - 2011-04-16 16:14 -0500
    Re: looking for an "inversion" pattern Robert Klemme <shortcutter@googlemail.com> - 2011-04-16 23:40 +0200

csiph-web