perldoc UNIVERSAL will help; for example, you missed VERSION.

I realize samtregar mentioned BEGIN, CHECK, INIT, and END as not being subroutines. That is, in fact, not the case. They are all special subroutines, and attempting to define one by that name will cause it to trigger as if you had left out the "sub" keyword. So, you were on the right track with them. 

package Foo;
sub BEGIN { print "I am Foo, called in BEGIN!\n" }

[download]
The print statement is run even if BEGIN is not called. You can't even call BEGIN yourself after that.

Personally I'd avoid any subroutine name in all caps. For example, you missed all of the tie hooks (see perltie). I have seen modules (Class::InsideOut springs to mind) that will call all-caps subroutines in your modules, but it's chancy; the subroutine name may get hijacked by Perl at some point.

In reply to Re: Which are perl-internal subroutines? by Somni
in thread Which are perl-internal subroutines? by Tobiwan

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.