From: Mathieu Bouchard <matju@...>
Date: 2003-11-24T03:12:29+09:00
Subject: Re: open-uri patch, added progress_proc hook


On Wed, 19 Nov 2003, T. Onoma wrote:

> Tanaka Akira:
> > pbar = nil
> > open("http://...",
> >   :content_length_proc => lambda {|s|
> >     (pbar = ProgressBar.new("test", s)).file_transfer_mode if s
> >   },
> >   :progress_proc => lambda {|s|
> >     pbar.set s if pbar
> >   })
> > In Ruby2, `pbar = nil' can be dropped.
>
> yes, it seems almost bizarre that pbar is kept "on hand" by both
> lambdas. this is closure right? wow! this could have big effects on
> Ruby1 code running with Ruby2.

I'm puzzled by how this new behaviour would make anything actually easier
for anyone, while demanding significant workarounds for code that relies
on having separate locals for multiple activations of a closure.

Unless I'm really missing something big (please tell me!), it seems to be
about on the same level as my proposed merging of Module and Class, except
that my proposal didn't have such an obvious compatibility impact.

> p.s. if you don't mind me asking, what do you think of Structural
> Reflection?

never heard about it, though the words do sound familiar. what is it?

________________________________________________________________
Mathieu Bouchard                       http://artengine.ca/matju