perlfaq nodetype
faq_monk
<P>
The
<FONT SIZE=-1>AUTOLOAD</FONT> method, discussed in [perlman:perlsub|Autoloading] and
[perlman:perltoot|AUTOLOAD: Proxy Methods], lets you capture calls to undefined functions and methods.
<P>
When it comes to undefined variables that would trigger a warning under <CODE>-w</CODE>, you can use a handler to trap the pseudo-signal
<CODE>__WARN__</CODE> like this:
<P>
<PRE> $SIG{__WARN__} = sub {
</PRE>
<P>
<PRE> for ( $_[0] ) { # voici un switch statement
</PRE>
<P>
<PRE> /Use of uninitialized value/ && do {
# promote warning to a fatal
die $_;
};
</PRE>
<P>
<PRE> # other warning cases to catch could go here;
</PRE>
<P>
<PRE> warn $_;
}
</PRE>
<P>
<PRE> };
</PRE>
<P>