CORE - Namespace for Perl's core routines
BEGIN { *CORE::GLOBAL::hex = sub { 1; };}print hex("0x50"),"\n";# prints 1print CORE::hex("0x50"),"\n";# prints 80CORE::say "yes";# prints yesBEGIN { *shove = \&CORE::push; }shove @array, 1,2,3;# pushes on to @arrayTheCORE namespace gives access to the original built-in functions of Perl. TheCORE package is built into Perl, and therefore you do not need to use or require a hypothetical "CORE" module prior to accessing routines in this namespace.
A list of the built-in functions in Perl can be found inperlfunc.
For all Perl keywords, aCORE:: prefix will force the built-in function to be used, even if it has been overridden or would normally require thefeature pragma. Despite appearances, this has nothing to do with the CORE package, but is part of Perl's syntax.
For many Perl functions, the CORE package contains real subroutines. This feature is new in Perl 5.16. You can take references to these and make aliases. However, some can only be called as barewords; i.e., you cannot use ampersand syntax (&foo) or call them through references. See theshove example above. These subroutines exist for all keywords except the following:
__DATA__,__END__,and,cmp,default,do,dump,else,elsif,eq,eval,for,foreach,format,ge,given,goto,grep,gt,if,last,le,local,lt,m,map,my,ne,next,no,or,our,package,print,printf,q,qq,qr,qw,qx,redo,require,return,s,say,sort,state,sub,tr,unless,until,use,when,while,x,xor,y
Calling with ampersand syntax and through references does not work for the following functions, as they have special syntax that cannot always be translated into a simple list (e.g.,eof vseof()):
chdir,chomp,chop,defined,delete,each,eof,exec,exists,keys,lstat,pop,push,shift,splice,split,stat,system,truncate,unlink,unshift,values
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 thesubs 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 theCORE::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 1In both cases, if you want access to the original, unaltered routine, use theCORE:: prefix:
print CORE::hex("0x50"),"\n";# prints 80This documentation provided by Tels <nospam-abuse@bloodgate.com> 2007.
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