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vars - Perl pragma to predeclare global variable names |
vars - Perl pragma to predeclare global variable names (obsolete)
use vars qw($frob @mung %seen);
NOTE: The functionality provided by this pragma has been superseded
by our declarations, available in Perl v5.6.0 or later. See
our in the perlfunc manpage.
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 Pragmatic Modules in the perlmodlib manpage.
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vars - Perl pragma to predeclare global variable names |