From: Chad Perrin <perrin@...>
Date: 2010-02-20T03:57:10+09:00
Subject: Re: Global variables usage

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On Fri, Feb 19, 2010 at 09:00:47PM +0900, Robert Klemme wrote:
> 2010/2/19 di vi <infibit@gmail.com>:
> > botp wrote:
> >> On Fri, Feb 19, 2010 at 3:02 PM, di vi <infibit@gmail.com> wrote:
> >>>
> >>> 2) to print the global variable (gprint.rb)
> >>>
> >>> Code:
> >>> =EF=BF=BD =EF=BF=BDloop do
> >>> =EF=BF=BD =EF=BF=BDputs $foo
> >>> =EF=BF=BD =EF=BF=BDend
> >>
> >> where in this code (gprint.rb) does it say that you are accessing the
> >> file var.rb ?
> >> read on require and load...
> >>
> >> best regards -botp
> >
> > Load and require execute the complete program..I want only the value of
> > global variables to change in the respective .rb file.
>=20
> Well, there's an obvious solution to that: place the global variable
> in a file on its own which you load from all places that need it.
> However, I am not sure that this is generally a good idea.  What do
> you need that for?

=2E . . or edit the file you're loading/requiring so that it will only
conditionally execute code in the file if the file is executed directly,
and not if it is called as a library using load or require.  For
instance:

    > cat included_file.rb
    #!/usr/bin/env ruby
    $foo =3D 'foo'
    $bar =3D 'bar'
    if $0 =3D=3D __FILE__
      # code to be executed if file
      # called directly for execution
    end

    > cat including_file.rb
    #!/usr/bin/env ruby
    load 'included_file.rb'
    if $0 =3D __FILE__
      # do stuff with $foo
      # do stuff with $bar
    end

Apologies if I'm off-base -- I haven't read the whole thread in detail,
because I just rejoined the list after a hiatus.

--=20
Chad Perrin [ original content licensed OWL: http://owl.apotheon.org ]

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