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CORE.3pm
Langue: en
Version: 2007-12-18 (mandriva - 01/05/08)
Section: 3 (Bibliothèques de fonctions)
NAME
CORE - Pseudo-namespace for Perl's core routinesSYNOPSIS
BEGIN { *CORE::GLOBAL::hex = sub { 1; }; } print hex("0x50"),"\n"; # prints 1 print CORE::hex("0x50"),"\n"; # prints 80
DESCRIPTION
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.
OVERRIDING CORE FUNCTIONS
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
AUTHOR
This documentation provided by Tels <nospam-abuse@bloodgate.com> 2007.SEE ALSO
perlsub, perlfunc.Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre