vars.3

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

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.\" ========================================================================
.\"
.IX Title "vars 3"
.TH vars 3 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
vars \- Perl pragma to predeclare global variable names (obsolete)
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use vars qw($frob @mung %seen);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\s-1NOTE:\s0 For variables in the current package, the functionality provided
by this pragma has been superseded by \f(CW\*(C`our\*(C'\fR declarations, available
in Perl v5.6.0 or later.  See \*(L"our\*(R" in perlfunc.
.PP
This will predeclare all the variables whose names are 
in the list, allowing you to use them under \*(L"use strict\*(R", and
disabling any typo warnings.
.PP
Unlike pragmas that affect the \f(CW$^H\fR hints variable, the \f(CW\*(C`use vars\*(C'\fR and
\&\f(CW\*(C`use subs\*(C'\fR declarations are not BLOCK-scoped.  They are thus effective
for the entire file in which they appear.  You may not rescind such
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(CW\*(C`my()\*(C'\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 \*(L"Pragmatic Modules\*(R" in perlmodlib.