G'day dragonchild,

What your code is doing is calling the subroutine "$package::$funcName", and checking if it returns a defined value. This is certainly not what you want to be doing, because if the subroutine does not exist, you end up with a fatal errror.

If your subroutine does exist, you've just invoked it with no arguments, and it could return undef just to spite you anyway.

Rather than calling the subroutine, you instead want to use globs to access perl's symbol table. This is described in my reply above. It also happens to be a bit faster than methods using can(), since inheritance is not checked.

Cheers,
Paul


In reply to Re: Re: Checking if a subroutine has been defined in a package... by pjf
in thread Checking if a subroutine has been defined in a package... by dragonchild

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.