From: Robert Klemme <shortcutter@...>
Date: 2008-02-16T07:09:55+09:00
Subject: Re: closing files with abrupt interruptions

On 15.02.2008 14:39, Daniel Brumbaugh Keeney wrote:
> loop do
>   File.open somefile, 'r' do |io|
>     next
>   end
> end
> 
> Does somefile get closed?

Yes.  See also Peter's explanation.

> How would I test that?

Easily:

robert@fussel ~
$ echo 1 > x

irb(main):001:0> io = nil
=> nil
irb(main):002:0> File.open("x") {|io| p io, io.closed?}
#<File:x>
false
=> nil
irb(main):003:0> p io, io.closed?
#<File:x (closed)>
true
=> nil

> I have the same question if it raises an error (that gets rescued) or
> throws a symbol.

irb(main):004:0> File.open("x") {|io| p io, io.closed?; raise "E"}
#<File:x>
false
RuntimeError: E
         from (irb):4
         from (irb):4:in `open'
         from (irb):4
         from :0
irb(main):005:0> p io, io.closed?
#<File:x (closed)>
true
=> nil

Cheers

	robert