Beefy Boxes and Bandwidth Generously Provided by pair Networks
Problems? Is your data what you think it is?
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

The reason for your error is because the snippet

sub pr { print main::FO1; }

is compiled before the the snippet

use constant { FO1 => "value" };

(BTW braces for constant?? Weird.)

so perl has to apply some heuristics while parsing the former code. An all uppercase bareword ("FO1") as a first parameter to print, makes perl assume it's a filehandle.

So what you must do is one of the following:

  1. Mark up the print line so it's clear that you don't mean a filehandle. Unfortunately, this:

    sub pr { print +main::FO1; }
    still isn't enough.. (Why not? I really expected that this would work.)

    But even if it did work, that probably would still leave you with a prototype mismatch error

  2. compile the constant definition for before you use pq;

BTW It's considered best practice to start package (and module) names with an uppercase letter.

Seeing the trouble with the former attempt at a solution, the latter definitely looks like the best option.


In reply to Re: Accessing main::Constant by bart
in thread Accessing main::Constant by nagalenoj

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others drinking their drinks and smoking their pipes about the Monastery: (6)
    As of 2015-07-07 01:22 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (86 votes), past polls