I think that constants are not object-oriented, at least not the way that Moo thinks, and thus they are not exported.

I think the somewhat hacky, but somewhat yet established way to get at the constants would be to call them as (class) methods, just like Java implements some constants:

    $self->INDEX_FOO

# or

    MyClass->INDEX_FOO

[download]

Of course, you then incur the penalty of making a method call where a real constant could even have been inlined.

I'm not sure how well Moo (and Moo::Role) and Exporter mix, but maybe you can implicitly export your constants to all modules using your role:

package MyRole;
use Moo::Role;
use constant INDEX_FOO => 42;
use Exporter 'import';

our @EXPORT = ('INDEX_FOO');

[download]

If all else fails, you'll have to create a special module that just contains the constants...

In reply to Re: Exporting constants from a Moo role by Corion
in thread Exporting constants from a Moo role by 1nickt

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.