Beefy Boxes and Bandwidth Generously Provided by pair Networks
We don't bite newbies here... much
 
PerlMonks  

Re^2: odd behavior with DATA section

by Nkuvu (Priest)
on Jul 25, 2005 at 17:28 UTC ( #477913=note: print w/replies, xml ) Need Help??


in reply to Re: odd behavior with DATA section
in thread odd behavior with DATA section

You really ought to be using __END__ instead of __DATA__. See the SelfLoader POD explanation of the way the __DATA__ is intended to be used.

Maybe you can explain this better. I read the SelfLoader POD, and it seems to indicate that __END__ indicates the end of any subroutines in the __DATA__ section. Sort of. It seems to be talking about using the __DATA__ section in packages other than main (I'm referring to sections of the POD that say "works just like __END__ in main"). So if I simply replace __DATA__ with __END__ I can't read from the section. while (my $line = <END>) doesn't work at all. If I add the __END__ token after the __DATA__ then __END__ is read in as a line.

The SelfLoader documentation, as far as I can tell, is used to replace the AutoLoader to be able to do something. I don't write packages, so I am not understanding a lot of the POD. But my best guess is that the __DATA__ section is used for subroutines that might not be called, so you can load them only when they are used. Which doesn't do anything for me, since I'm not writing packages, I'm tossing some input onto the end of my script. I could put the information into another file, and read that, but I don't really see the point of that.

So tell me what it is that I am missing, please.

Replies are listed 'Best First'.
Re^3: odd behavior with DATA section
by converter (Priest) on Jul 26, 2005 at 00:28 UTC

    The DATA filehandle is always used to access the text after the token, no matter if it is the __END__ or the __DATA__ token. The perldata man page gives a few important details that you should be aware of.

    I had always believed that __END__ should be used in the top-level script, with __DATA__ used only in code compiled via require or do. After re-reading the perldata man page I am of the opinion that the __DATA__ token is similar to the __END__ token but with extra features and that its use in the top-level script is fine.

    Someone please correct me if I'm wrong.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://477913]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others studying the Monastery: (2)
As of 2021-04-21 03:06 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found

    Notices?