FAQ 7.24 How can I catch accesses to undefined variables, functions, or methods?

This is an excerpt from the latest version perlfaq7.pod, which
comes with the standard Perl distribution. These postings aim to
reduce the number of repeated questions as well as allow the community
to review and update the answers. The latest version of the complete
perlfaq is at http://faq.perl.org .

------------------------------------------------------------ --------

7.24: How can I catch accesses to undefined variables, functions, or methods?

The AUTOLOAD method, discussed in "Autoloading" in perlsub and
"AUTOLOAD: Proxy Methods" in perltoot, lets you capture calls to
undefined functions and methods.

When it comes to undefined variables that would trigger a warning under
"use warnings", you can promote the warning to an error.

use warnings FATAL => qw(uninitialized);



------------------------------------------------------------ --------

The perlfaq-workers, a group of volunteers, maintain the perlfaq. They
are not necessarily experts in every domain where Perl might show up,
so please include as much information as possible and relevant in any
corrections. The perlfaq-workers also don't have access to every
operating system or platform, so please include relevant details for
corrections to examples that do not work on particular platforms.
Working code is greatly appreciated.

If you'd like to help maintain the perlfaq, see the details in
perlfaq.pod.