From: Gregory Brown <gregory.t.brown@...>
Date: 2009-01-27T01:18:32+09:00
Subject: Re: Question about BlankSlate.reveal

On Mon, Jan 26, 2009 at 8:55 AM, Robert Klemme
<shortcutter@googlemail.com> wrote:

> I do not really see caching that extends the instance on which #reveal
> was invoked.  There is actually one closure per instance (more
> correctly: one closure per call of reveal) and so no global cache.
>
> Where exactly is your problem?

I think you missed that the local variable was at the class level.

>> class A
>>   a = nil
>>   define_method :foo do
?>     a ||= self
>>   end
>> end
=> #<Proc:0x000585d4@(irb):11>
>> A.new.foo
=> #<A:0x57030>
>> A.new.foo
=> #<A:0x57030>
>> A.new.foo
=> #<A:0x57030>
>> A.new.foo
=> #<A:0x57030>

But I think I have a suitable fix:
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/325826

What do you think?

-greg

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