NAME¶
CORE - Pseudo-namespace for Perl's core routines
SYNOPSIS¶
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.