that @constants will contain numbers and that you'll be checking whether or not a constant by that name exists...which it won't.
Hmm, well maybe my function doesn't do what the OP requested (quite possible since it was written pre-1pm ;) but it will do what I intended - given a list of strings return if they exist in a given package e.g 
sub UNIVERSAL::which_constants {
  my($class, @constants) = @_;

  return grep exists $constant::declared{"$class\::$_"}, @constants;
}

use constant FOO => "a string";
use constant BAR => [ qw/ an array / ];
use constant BAZ => { qw/ a hash / };

print "constant exists - $_\n"
  for main->which_constants( qw/ ichi FOO bar BAZ one DEUX / );

__output__

constant exists - FOO
constant exists - BAZ

[download]
And if you want to go from constant values to constant names then check out chromatic's Devel::Constants module.
HTH

_________
broquaint

In reply to Re: Re: Re: managing constants created with constant.pm by broquaint
in thread managing constants created with constant.pm by bakunin

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!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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, details, 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, summary, 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.