From: Robert Klemme <shortcutter@...>
Date: 2007-10-04T22:52:23+09:00
Subject: Re: File scope variable

2007/10/3, Martin Martinos <chabotm@yahoo.com>:
> 7stud -- wrote:
> > Martin Martinos wrote:
> >> A
> >> variable that I can access in each function of each class but which is
> >> private to my .rb file.
> >>
> >> Does anybody has a idea?
> >
> > Yes.  Don't do it.  That's a horrible idea.  If a method in your class
> > needs a value, pass the value as an argument.
>
>
> I agree with you on this point, but in some circumstance it would be
> interesting to have file scoped variables.   There are at least one
> built-in variable that is local to the current file and it's the
> __FILE__ variable.  In fact in my require function I would use a local
> variable that tells me what is the current file folder path.  I would
> also use it to localize the path of the binary files that my script
> uses. I don't think in that case its a bad idea since __FILE__ has also
> a file scope.
>
> example:
>
> require 'pathname'
> my_path = Pathname.new(__FILE__).realpath.dirname
>
> require my_path +'mylib'
>
> def exec_my_bin()
>   `#{my_path + 'bin/mybin'}`
> end

What is wrong with this solution?  my_path *is* visible in the current
file only as far as I can see.  Btw, what are you trying to achieve?

Kind regards

robert