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.\" -*- mode: troff; coding: utf-8 -*- .\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>. .ie n \{\ . ds C` "" . ds C' "" 'br\} .el\{\ . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" ======================================================================== .\" .IX Title "vars 3" .TH vars 3 2019-02-18 "perl v5.38.0" "Perl Programmers Reference Guide" .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH NAME vars \- Perl pragma to predeclare global variable names .SH SYNOPSIS .IX Header "SYNOPSIS" .Vb 1 \& use vars qw($frob @mung %seen); .Ve .SH DESCRIPTION .IX Header "DESCRIPTION" NOTE: For use with variables in the current package for a single scope, the functionality provided by this pragma has been superseded by \f(CW\*(C`our\*(C'\fR declarations, available in Perl v5.6.0 or later, and use of this pragma is discouraged. See "our" in perlfunc. .PP This pragma will predeclare all the variables whose names are in the list, allowing you to use them under \f(CW\*(C`use strict\*(C'\fR, and disabling any typo warnings for them. .PP Unlike pragmas that affect the \f(CW$^H\fR hints variable, the \f(CW\*(C`use vars\*(C'\fR and \&\f(CW\*(C`use subs\*(C'\fR declarations are not lexically scoped to the block they appear in: they affect the entire package in which they appear. It is not possible to rescind these declarations with \f(CW\*(C`no vars\*(C'\fR or \f(CW\*(C`no subs\*(C'\fR. .PP Packages such as the \fBAutoLoader\fR and \fBSelfLoader\fR that delay loading of subroutines within packages can create problems with package lexicals defined using \f(CWmy()\fR. While the \fBvars\fR 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. .PP See "Pragmatic Modules" in perlmodlib.