use strict
qw(vars subs);
my ($pack, @imports) = @_;
if (($ch, $sym) = /^([\$\@\%\*\&])(.+)/) {
# time for a more-detailed check-up
if ($sym =~ /^\w+[[{].*[]}]$/) {
Carp
::croak
("Can't declare individual elements of hash or array");
} elsif (warnings
::enabled
() and length($sym) == 1 and $sym !~ tr/a-zA-Z//) {
warnings
::warn("No need to declare built-in vars");
} elsif (($^H
&= strict
::bits
('vars'))) {
Carp
::croak
("'$_' is not a valid variable name under strict vars");
$sym = "${callpack}::$sym" unless $sym =~ /::/;
Carp
::croak
("'$_' is not a valid variable name");
Carp
::croak
("'$_' is not a valid variable name");
vars - Perl pragma to predeclare global variable names (obsolete)
use vars qw($frob @mung %seen);
NOTE: For variables in the current package, the functionality provided
by this pragma has been superseded by C<our> declarations, available
in Perl v5.6.0 or later. See L<perlfunc/our>.
This will predeclare all the variables whose names are
in the list, allowing you to use them under "use strict", and
disabling any typo warnings.
Unlike pragmas that affect the C<$^H> hints variable, the C<use vars> and
C<use subs> declarations are not BLOCK-scoped. They are thus effective
for the entire file in which they appear. You may not rescind such
declarations with C<no vars> or C<no subs>.
Packages such as the B<AutoLoader> and B<SelfLoader> that delay
loading of subroutines within packages can create problems with
package lexicals defined using C<my()>. While the B<vars> pragma
cannot duplicate the effect of package lexicals (total transparency
outside of the package), it can act as an acceptable substitute by
pre-declaring global symbols, ensuring their availability to the
See L<perlmodlib/Pragmatic Modules>.