On Thu, Sep 9, 2010 at 10:25, Jatin <daveyja...@gmail.com> wrote: > >> Hi Jatin, >> >> A callback is a reference to a subroutine. > > [Jatin] if a callback is a reference to a subroutine then it can be stored > in scalar variable to call that subroutine. Am i correct in my understanding > ?
Yes, all types of references can be stored in scalars. snip > [Jatin] So in actual terms the File::Find's find() method in turn invokes > our callback subroutine but i am confused at one point , what is > "File::Find::name" , > > how does it return the complete path of the filename ? snip $File::Find::name is a package variable from File::Find. File::Find::find (i.e. the find function) sets that value each time before it calls the callback. snip > If the File::Find's find method calls our subroutine , and we do not have > any lexical variable called as name then how come the execution of our > callback subroutine returns the complete path of the file name ? snip The callback is printing the value of $File::Find::name (which, again, is set by the File::Find::find function before the callback is called). File::Find's interface is through its package variables. It is a very bad design and is much regretted, but there is nothing to do about it now. -- Chas. Owens wonkden.net The most important skill a programmer can have is the ability to read. -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
