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Posted by onlineviewer on August 28, 2006, 9:06 pm
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thx,
John W. Krahn wrote:
> onlineviewer wrote:
> >
> > John W. Krahn wrote:
> >>
> >>onlineviewer wrote:
> >>>Can someone please explain this code section to me. This is from the
> >>>O'reilly book. learning objects,references. I see the end result, but i
> >>>am not sure how and in what order it runs. I see that the $callback
> >>>variable is a reference to the subroutine,
> >>>'create_find_callback_that_sums_the_size'
> >>
> >>Wrong. $callback is a reference to an anonymous sub that is CREATED by
> >>'create_find_callback_that_sums_the_size'.
> >>
> >>perldoc -q closure
> >>
> >>>then the find method is
> >>>called with the $callback reference and the bin directory.
> >>
> >>Correct.
> >>
> >>>Then the
> >>>subroutine executes on each of the contents of the bin directory. Is
> >>>that right so far ?? Thanks...
> >>
> >>File::Find::find traverses the directory tree starting at 'bin' and for each
> >>entry it calls the subroutine supplied by you and puts the name of that entry
> >>in the $_ variable.
> >
> > Thanks for the replies, it is very helpful. One more question, is the
> > subroutine called for as many elements that there are in the bin
> > directory,
>
> Yes.
>
> > or is the subroutine being invoked only once and the
> > contents of bin are being copied into the subroutine to be worked on
>
> No.
>
>
> John
> --
> use Perl;
> program
> fulfillment
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