From: nobu.nokada@...
Date: 2002-03-16T00:35:46+09:00
Subject: Re: language addition: automatic 'new'

Hi,

At Fri, 15 Mar 2002 23:08:45 +0900,
Paul Brannan wrote:
> >  I wrote my first >1K ruby program over the week,
> > and it occured to me, it would be great if
> >    Klass(param)
> >  be converted to 
> >    Klass.new(param)
> >   Automagically ...
> >   or may be Klass.__default_ctor(param), where __default_ctor defaults to
> > new,
> >   and can be ressigned if required ...
> 
> I'm not sure if this is a good idea, but it sounded like a challenge, so
> here goes:
> 
>   module New_Shortcuts
>     def self.undefined_method(obj, name)
>       raise NameError, "undefined method `#{name}' for <#{obj.type}:0x#{'%x'%(obj.id)}>"
>     end
>   
>     def self.recreate
>       ObjectSpace.each_object(Object) do |obj|
>         case obj
>         when Class
>           class_name = obj.inspect
>           if obj.respond_to?(:new) then
>             Object.instance_eval do
>               define_method class_name.intern, obj.method(:new).to_proc
>             end
>           end
>         end
>       end
>     end

It's too expensive to scan all objects, and a nested class name
cannot be used as a method name.  Also already defined methods
shoudn't be overridden.

      Object.constants.each do |name|
        obj = Object.const_get(name)
        if Class === obj and defined?(obj.new) and
           !eval("defined? #{name}()", TOPLEVEL_BINDING)
          Object.instance_eval do
            define_method name, obj.method(:new).to_proc
          end
        end
      end

-- 
Nobu Nakada