From: David Alan Black <dblack@...>
Date: 2002-02-20T03:15:58+09:00
Subject: Re: Anonymous class support

Hello --

On Wed, 20 Feb 2002, Christoph wrote:

> <nobu.nokada@softhome.net> wrote in message
> news:200202190622.g1J6MqX18863@sharui.nakada.kanuma.tochigi.jp...
>
> >   Class.new(superclass).class_eval do
> >     def foo
> >     end
> >   end
> >
> > In 1.7, .class_eval isn't necessary.
>
> Unfortunately you cannot use the ladder idiom within method bodies - for
> example ..
>
> ----
> class A
>   def foo(&body)
>     Class.new(type,&body)
>   end
>    def goo(&body)
>      res = Class.new(type)
>      res.class_eval &body  #  this works because &body is a string!
>      res
>    end
>   #
> end
>
>
> anon =A.new.foo { Pointless = "okay" }
> puts anon.const_get :Pointless    # => okay
> # A.new.foo { def annoying_parse_error() end }
>
>
> anon.new.goo { def okay(); puts "okay" end }.new.okay  # => okay


Playing around with this example, I can't seem to get the parse error
(1.7.1).  Where does it happen exactly?

Also, isn't body a proc, rather than a string (inside method goo)?


David

-- 
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav