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copied!<p>No, not really.</p> <p>Things you can do are:</p> <p>Sprinkle your code with debug code.</p> <pre><code>use constant DEBUG => 1; ...; debug_function($var) if DEBUG; </code></pre> <p>Once you unset the <code>DEBUG</code> constant for deployment, you won't have any extra runtime costs (the statements are optimized away), and you can re-activate them whenever neccessary.</p> <p>You can even say evil things like</p> <pre><code>BEGIN {require Data::Dumper if DEBUG} </code></pre> <p>to conditionally load debugging modules.</p> <p>If you want to override Core functions, why not add debug handlers? That's not evil patching, thats augmenting…</p> <pre><code>BEGIN { if (DEBUG) { my $oldfunction = \&CORE::function; *CORE::function = sub { # add prototypes if you like them debug_handler(@_); &$oldfunction; }; } } </code></pre> <p>Use this technique to log your calls to your database.</p> <p>You can re-open <code>STDERR</code> to some special file (or pipe, or terminal, or…)</p> <pre><code>BEGIN { if (DEBUG) { close STDERR or die "STDERR hates me and doesn't want to be closed."; open STDERR, '>', "/path/to/my/error/log.file" or die "couldn't open error log"; } } </code></pre> <p>You can define your <code>DIE</code> and <code>WARN</code> handlers to do something <em>you</em> want:</p> <pre><code>$SIG{__WARN__} = sub { print MYERRORS "There was a warning: $!"; # do additional error handling unless you're paranoid } </code></pre> <p>The <code>warnings</code> pragma can help you to make important warnings fatal:</p> <pre><code>use warnings qw(FATAL importantWarning); </code></pre> <p>or to create your own warnings, just see the documentation</p> <p>And to get call stack traces, look into the numerous possibilities of the <code>caller</code> function. Essentially, you might want to build your personal interpretation of the <code>Carp</code> module as <code>CGI::Carp</code> may not meet your needs.</p>

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