If you're worried about polluting other's namespaces, why don't you just override the function locally? I started with japhy's modification and produced this:
BEGIN {
use subs 'length';
sub length(;$) {
my $arg = @_ ? $_[0] : $_;
defined($arg) ? CORE::length($arg) : undef;
}
}
You could even modularize this pretty easily:
package Func::Smarter;
require Exporter;
use vars qw'@ISA @EXPORT @EXPORT_OK';
use subs qw 'length'
@ISA = 'Exporter';
@EXPORT_OK = qw'length';
sub length (;$) {
my $arg = @_ ? $_[0] : $_;
defined($arg) ? CORE::length($arg) : undef;
}
1;
Then you could just use Func::Smarter 'length';, yes?
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