* Brian McCauley suggested that this answer use warnings instead of black magic
Index: perlfaq7.pod
===================================================================
RCS file: /cvs/public/perlfaq/perlfaq7.pod,v
retrieving revision 1.10
diff -u -d -r1.10 perlfaq7.pod
--- perlfaq7.pod 4 Sep 2002 22:33:45 -0000 1.10
+++ perlfaq7.pod 5 Nov 2002 02:16:45 -0000
@@ -675,31 +675,16 @@
print "No such command: $string\n";
}
-=head2 How can I catch accesses to undefined variables/functions/methods?
+=head2 How can I catch accesses to undefined variables, functions, or methods?
The AUTOLOAD method, discussed in L<perlsub/"Autoloading"> and
L<perltoot/"AUTOLOAD: Proxy Methods">, lets you capture calls to
undefined functions and methods.
When it comes to undefined variables that would trigger a warning
-under C<-w>, you can use a handler to trap the pseudo-signal
-C<__WARN__> like this:
-
- $SIG{__WARN__} = sub {
-
- for ( $_[0] ) { # voici un switch statement
-
- /Use of uninitialized value/ && do {
- # promote warning to a fatal
- die $_;
- };
-
- # other warning cases to catch could go here;
-
- warn $_;
- }
+under C<use warnings>, you can promote the warning to an error.
- };
+ use warnings FATAL => qw(uninitialized);
=head2 Why can't a method included in this same file be found?
