Edit: /usr/share/perl5/vars.pm (2458B)
package vars;
use 5.006;
our $VERSION = '1.05';
use warnings::register;
use strict qw(vars subs);
sub import {
my $callpack = caller;
my (undef, @imports) = @_;
my ($sym, $ch);
foreach (@imports) {
if (($ch, $sym) = /^([\$\@\%\*\&])(.+)/) {
if ($sym =~ /\W/) {
# time for a more-detailed check-up
if ($sym =~ /^\w+[[{].*[]}]$/) {
require Carp;
Carp::croak("Can't declare individual elements of hash or array");
} elsif (warnings::enabled() and length($sym) == 1 and $sym !~ tr/a-zA-Z//) {
warnings::warn("No need to declare built-in vars");
} elsif (($^H & strict::bits('vars'))) {
require Carp;
Carp::croak("'$_' is not a valid variable name under strict vars");
}
}
$sym = "${callpack}::$sym" unless $sym =~ /::/;
*$sym =
( $ch eq "\$" ? \$$sym
: $ch eq "\@" ? \@$sym
: $ch eq "\%" ? \%$sym
: $ch eq "\*" ? \*$sym
: $ch eq "\&" ? \&$sym
: do {
require Carp;
Carp::croak("'$_' is not a valid variable name");
});
} else {
require Carp;
Carp::croak("'$_' is not a valid variable name");
}
}
};
1;
__END__
=head1 NAME
vars - Perl pragma to predeclare global variable names
=head1 SYNOPSIS
use vars qw($frob @mung %seen);
=head1 DESCRIPTION
NOTE: For use with variables in the current package for a single scope, the
functionality provided by this pragma has been superseded by C
declarations, available in Perl v5.6.0 or later, and use of this pragma is
discouraged. See L.
This pragma will predeclare all the variables whose names are
in the list, allowing you to use them under C