From: Markus <markus@...>
Date: 2004-10-02T02:42:02+09:00
Subject: Re: define_method, proc with block ?

On Fri, 2004-10-01 at 09:08, trans. (T. Onoma) wrote:
> A little help here. I'm trying to dynamically create a method that passes 
> through to another method but adds in a fixed argument. Unfortunately I can't 
> pass a block via a proc. 

     Why not?  Or more lucidly (asfter this post a swear I'm going for
tea): what problems are you having?  It seems like either of the methods
that Mauricio

http://www.talkaboutprogramming.com/group/comp.lang.ruby/messages/107894.html

or I (about half way down, search for "$observers") 

http://www.talkaboutprogramming.com/group/comp.lang.ruby/messages/107721.html, 
suggested on this thread should do the trick.

-- MarkusQ

> How does one handle this? I ended up having to 
> create two methods for each wrapped method. Yuk. Here's the code snip:
> 
>   # NOTE: wrap_advice is the method/proc used to wrap meth
>   # meth is defined in a subclass or singleton, c, to achieve wrapping
> 
>   # define the interceptor
>   c.class_eval {
>     define_method("advice___#{meth}",wrap_advice)
>   }
>   c.class_eval %Q{
>     def #{meth}(*args,&blk)
>       target = proc{super}  #proc{|*args,&blk| super(*args,&blk)}
>       advice___#{meth}(target,*args,&blk)
>     end
>   }
> 
> Notice also I can't pass the block via the proc'd super either. I want to just 
> do this:
> 
>   # define the interceptor
>   c.class_eval {
>     define_method(meth) {|*args,&blk|
>       target = proc{|*args,&blk| super(*args,&blk)}
>       wrap_advice.call(target,*args,&blk)
>     end
>   }
> 
> Any ideas?
> 
> Thanks,
> T.