Out of scope - close/finalizers

ruby-talk
1

The last week I have been browsing compl.lang.ruby at google, on how to
ensure that a resource gets closed correctly.

The destructor[blocks, finalizers] subject has been pretty well covered
on this NG I think. Finalizers should be avoided, because it does stuff
behind peoples bag. People are encouraged to use "block"s. I think I got it.

Is it correct there does’nt exist any “out-of-scope” feature?

Well, I do not think so! I just want to be 100% sure :slight_smile:

···

–
Simon Strandgaard

2

“Simon Strandgaard” 0bz63fz3m1qt3001@sneakemail.com wrote in message
news:pan.2003.04.07.19.46.06.878571@sneakemail.com…

Is it correct there does’nt exist any “out-of-scope” feature?

http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/6966

but I suspect the C-API will allow you to hook into finalize.

Mikkel

3

“MikkelFJ” mikkelfj-anti-spam@bigfoot.com wrote in message
news:3e921047$0$136$edfadb0f@dtext01.news.tele.dk…

Is it correct there does’nt exist any “out-of-scope” feature?

http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/6966

and then again:
http://www.eng.dmu.ac.uk/~hgs/ruby/RUBY_SNAPSHOT_RDOC/classes/Finalizer.html
http://www.eng.dmu.ac.uk/~hgs/ruby/RUBY_SNAPSHOT_RDOC/files/lib/ruby/1_8/fin
alize_rb.html

4

I know you can do like this:

def use(resource)
resource.open
yield
ensure
resource.close
end

use(alien_connection) do
# do somethine
end

In order to use it, you must supply a block.

Finalizers gets invoked when a object is being garbage collected. This is
not necessarily when the object goes out-of-scope. Thus finalizers cannot
be used to get notify on “out-of-scope”. Am I right here?

What I wanna make sure is that “blocks” is the one-and-only way to get
notify on “out-of-scope”?

Or is there other options, which im not aware of?

···

On Tue, 08 Apr 2003 03:06:32 +0200, MikkelFJ wrote:

“MikkelFJ” mikkelfj-anti-spam@bigfoot.com wrote in message
news:3e921047$0$136$edfadb0f@dtext01.news.tele.dk…

Is it correct there does’nt exist any “out-of-scope” feature?

http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/6966

and then again:
http://www.eng.dmu.ac.uk/~hgs/ruby/RUBY_SNAPSHOT_RDOC/classes/Finalizer.html
http://www.eng.dmu.ac.uk/~hgs/ruby/RUBY_SNAPSHOT_RDOC/files/lib/ruby/1_8/finalize_rb.html

–
Simon Strandgaard

BTW. The reason why im asking is that im writing a text on how to embed
ruby into c++. I don’t wanna write incorrect stuff :slight_smile:
http://metaeditor.sf.net/embed/