From: Eric Jacoboni <jaco@...>
Date: 2006-02-11T01:03:25+09:00
Subject: Yet another question on exceptions

Hi,

If i use File::open to open/create a file objet, and if i use a block
with it, the file will be automatically close when the block ends:

Now, considering this buggy snippet:

begin
  File.open("my_file") do |fic|
    fic.puts("bla")
  end
rescue Exception => e
  STDERR.puts(e)
  exit(1)
end

Here, the "not opened for writing" exception will be raised, the block
end will never be reached and the file will remain opened, isn't it ?
To circumvent this, i have to make fic a global variable and put the
appropriate code in a ensure clause (or open a begin/ensure in the
File.open block to close the file... too bad)

So, my question is: what's the benefit of this idiom versus this one:

begin
 fd = File.new("my_file")
     ...
rescue Exception => e
  STDERR.puts(e)
  exit(1)
ensure
 fd.close if fd and not fd.closed?
end

Is there something i've missed?
-- 
Eric Jacoboni, ne il y a 1442972561 secondes