From: Daniel Schierbeck <daniel.schierbeck@...>
Date: 2005-10-27T03:27:06+09:00
Subject: Re: A comparison by example of keyword argument styles

Eric Mahurin wrote:
> --- Yukihiro Matsumoto <matz@ruby-lang.org> wrote:
> 
> 
>>Hi,
>>
>>In message "Re: A comparison by example of keyword argument
>>styles"
>>    on Tue, 25 Oct 2005 00:15:35 +0900, Eric Mahurin
>><eric_mahurin@yahoo.com> writes:
>>
>>|> otherwise we
>>|> must change the code as
>>|> 
>>|>   def foo(*args, **keys)
>>|>     bar(*args, **keys)
>>|>   end
>>|> 
>>|> everywhere, to just do delegation.
>>|
>>|or rather:
>>|
>>|def foo(*args, **keys, &block)
>>|  bar(*args, **keys, &block)
>>|end
>>|
>>|What's wrong with having to do that?
>>
>>It's longer than it is really needed.  I want to delegate
>>everything
>>I've passed, that's all.  I'd rather delegate blocks as well
>>when I
>>write bar(*args).
>>
>>							matz.
> 
> 
> Actually, I think the best way to do delegation would be to
> have a #define_method that didn't change self.  If you wanted
> to delegate obj.bar to #foo (in the current class), it would be
> nice to be able to do something like this:
> 
> # Proc/Method arg instead of block will leave self alone
> define_method(:foo,obj.method(:bar))
> 
> Right now (only in v1.9 - where a block can be a block
> argument), you'd do it like this:
> 
> define_method(:foo) { |*args,&block|
>   obj.bar(*args,&block)
> }
> 
> or:
> 
> meth = obj.method(:bar)
> define_method(:foo) { |*args,&block|
>   meth.call(*args,&block)
> }
> 
> 
> 
> 
> 		
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> 


Why not simply this:

   def foo(*args, &block)
     deletegate_to obj, :meth1, :meth2
     # same as
     obj.meth1.meth2(*args, &block)
   end


Cheers,
Daniel