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NOTE: For variables in the current package, the functionality provided by this pragma has been superseded by

declarations, available in Perl v5.6.0 or later. See our in perlfunc.

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

hints variable, the
use vars
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
no subs

Packages such as the AutoLoader and SelfLoader that delay loading of subroutines within packages can create problems with package lexicals defined using

. 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 Pragmatic Modules in perlmodlib.

openSUSE Logo