From: Daniel Schierbeck <daniel.schierbeck@...>
Date: 2005-11-26T01:47:27+09:00
Subject: Re: `finalize' method?

Hugh Sasse wrote:
> On Sat, 26 Nov 2005, Daniel Schierbeck wrote:
> 
>> Hugh Sasse wrote:
>>> On Sat, 26 Nov 2005, Daniel Schierbeck wrote:
>>>
>>>> I just think it's weird that PHP has destructors and Ruby doesn't ;)
>>>>
>>>>   http://www.php.net/manual/en/language.oop5.decon.php
>>> I find this tricky too: the only model I can think of is that where
>>> you need destructors, your constructor desstructs, and you get at
>>> the object with a block, in the style of open("file"){|f| ...}; if
>>> you see what I mean.
>> No, not really. I really can't stretch enough that I'm a noob... :)
> 
> The braces, curly brackets, are a block.  The CS people will tell
> you it is a closure.  What it means is: In the current scope (local
> variables defined, etc) execute open("file") to open the file for
> reading, and then [when inside open it effectively calls yield] you
> will have a parameter which we'll call f, and we'll do something
> with it in the local scope until the closing brace of the block.  On
> the closing brace, open will close the file for us.   The oft' used
> each method behaves in a similar way.

Oh, sorry, I misunderstood you: You mean something like this:

   class Klass
     def initialize
       yield self
       finalize
     end

     def finalize
       # do something
     end
   end

Sorry, I'm kinda groggy ;)


Cheers,
Daniel