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CORE(3)		       Perl Programmers Reference Guide		       CORE(3)

       CORE - Pseudo-namespace for Perl's core routines

	   BEGIN {
	       *CORE::GLOBAL::hex = sub { 1; };

	   print hex("0x50"),"\n";		       # prints 1
	   print CORE::hex("0x50"),"\n";	       # prints 80

       The "CORE" namespace gives access to the original built-in functions of
       Perl. There is no "CORE" package, and therefore you do not need to use
       or require an hypothetical "CORE" module prior to accessing routines in
       this namespace.

       A list of the built-in functions in Perl can be found in perlfunc.

       To override a Perl built-in routine with your own version, you need to
       import it at compile-time. This can be conveniently achieved with the
       "subs" pragma. This will affect only the package in which you've
       imported the said subroutine:

	   use subs 'chdir';
	   sub chdir { ... }
	   chdir $somewhere;

       To override a built-in globally (that is, in all namespaces), you need
       to import your function into the "CORE::GLOBAL" pseudo-namespace at
       compile time:

	   BEGIN {
	       *CORE::GLOBAL::hex = sub {
		   # ... your code here

       The new routine will be called whenever a built-in function is called
       without a qualifying package:

	   print hex("0x50"),"\n";		       # prints 1

       In both cases, if you want access to the original, unaltered routine,
       use the "CORE::" prefix:

	   print CORE::hex("0x50"),"\n";	       # prints 80

       This documentation provided by Tels <> 2007.

       perlsub, perlfunc.

perl v5.10.1			  2009-02-12			       CORE(3)

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