vars - Perl pragma to predeclare global variable names
use vars qw($frob @mung %seen);
NOTE: For use with variables in the current package for a single scope, the
functionality provided by this pragma has been superseded by our
declarations, available in Perl v5.6.0 or later, and use of this pragma is
discouraged. See 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 $^H hints variable, the use vars and
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 no vars or no subs .
Packages such as the AutoLoader and SelfLoader that delay
loading of subroutines within packages can create problems with
package lexicals defined using my() . While the 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
later-loaded routines.
See perlmodlib/Pragmatic Modules.
|