3 CORE - Pseudo-namespace for Perl's core routines
8 *CORE::GLOBAL::hex = sub { 1; };
11 print hex("0x50"),"\n"; # prints 1
12 print CORE::hex("0x50"),"\n"; # prints 80
13 CORE::say "yes"; # prints yes
17 The C<CORE> namespace gives access to the original built-in functions of
18 Perl. It also provides access to keywords normally available
19 only through the L<feature> pragma. There is no C<CORE>
20 package, and therefore you do not need to use or
21 require an hypothetical "CORE" module prior to accessing routines in this
24 A list of the built-in functions in Perl can be found in L<perlfunc>.
26 =head1 OVERRIDING CORE FUNCTIONS
28 To override a Perl built-in routine with your own version, you need to
29 import it at compile-time. This can be conveniently achieved with the
30 C<subs> pragma. This will affect only the package in which you've imported
37 To override a built-in globally (that is, in all namespaces), you need to
38 import your function into the C<CORE::GLOBAL> pseudo-namespace at compile
42 *CORE::GLOBAL::hex = sub {
47 The new routine will be called whenever a built-in function is called
48 without a qualifying package:
50 print hex("0x50"),"\n"; # prints 1
52 In both cases, if you want access to the original, unaltered routine, use
55 print CORE::hex("0x50"),"\n"; # prints 80
59 This documentation provided by Tels <nospam-abuse@bloodgate.com> 2007.
63 L<perlsub>, L<perlfunc>.