From: Kent Dahl <kentda@...>
Date: 2003-05-17T03:20:55+09:00
Subject: Re: procs and context

repeatr wrote:
>   def live(&block)
>     instance_eval { Proc.new.call }

Why not just
     instance_eval( &block ) 
which appears to work fine for me. The variable block points to a Proc
of the external block already due to the &-prefix.

Or are you getting at something more complex? 

As for why it your original code doesn't work:
  instance_eval { Proc.new.call }
instance_eval only changes the context of the given block (which
contains Proc.new.call), but Proc.new.call fetches another block/Proc
(&block) from the outside of the method, and _that_ Proc does NOT get
its context changed by instance_eval. Why should it? It would make
recursive use of Procs a nightmare.

HTH

-- 
(\[ Kent Dahl ]/)_    _~_    __[ http://www.stud.ntnu.no/~kentda/ ]___/~
 ))\_student_/((  \__d L b__/  NTNU - graduate engineering - 5. year  )
( \__\_�|�_/__/ ) _)Industrial economics and technological management(
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