From: Austin Ziegler <austin@...>
Date: 2002-07-09T23:36:57+09:00
Subject: Re: for ... else ... end

On Tue, 9 Jul 2002 18:10:01 +0900, Dirk Detering wrote:
> Regarding the 'ensure' .... I think I did not understand if it is
> a necessary part or only declarative sugar, as IMHO _every_ code
> after the end is run in either case.
> 
> So writing:
> 
> f = File.open("testfile")
> begin
> # .. process
> [...]
> ensure
> f.close
> end
> 
> or writing:
> 
> f = File.open("testfile")
> begin
> # .. process
> [...]
> end
> f.close

They're not, though. It's entirely possible that the begin ... end
block rethrows an exception or throws its own exception after
receiving an exception. The ensure clause requires that the code
within it be executed, even if the block is left because of a
thrown, uncaught, or rethrown exception.

-austin
-- Austin Ziegler, austin@halostatue.ca on 2002.07.09 at 10.34.47