perl594delta.1

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 "PERL594DELTA 1"
.TH PERL594DELTA 1 "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"
perl594delta \- what is new for perl v5.9.4
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This document describes differences between the 5.9.3 and the 5.9.4
development releases. See perl590delta, perl591delta, perl592delta
and perl593delta for the differences between 5.8.0 and 5.9.3.
.SH "Incompatible Changes"
.IX Header "Incompatible Changes"
.Sh "chdir \s-1FOO\s0"
.IX Subsection "chdir FOO"
A bareword argument to \fIchdir()\fR is now recognized as a file handle.
Earlier releases interpreted the bareword as a directory name.
(Gisle Aas)
.Sh "Handling of pmc files"
.IX Subsection "Handling of pmc files"
An old feature of perl was that before \f(CW\*(C`require\*(C'\fR or \f(CW\*(C`use\*(C'\fR look for a
file with a \fI.pm\fR extension, they will first look for a similar filename
with a \fI.pmc\fR extension. If this file is found, it will be loaded in
place of any potentially existing file ending in a \fI.pm\fR extension.
.PP
Previously, \fI.pmc\fR files were loaded only if more recent than the
matching \fI.pm\fR file. Starting with 5.9.4, they'll be always loaded if
they exist. (This trick is used by Pugs.)
.Sh "@\- and @+ in patterns"
.IX Subsection "@- and @+ in patterns"
The special arrays \f(CW\*(C`@\-\*(C'\fR and \f(CW\*(C`@+\*(C'\fR are no longer interpolated in regular
expressions. (Sadahiro Tomoyuki)
.ie n .Sh "$AUTOLOAD can now be tainted"
.el .Sh "\f(CW$AUTOLOAD\fP can now be tainted"
.IX Subsection "$AUTOLOAD can now be tainted"
If you call a subroutine by a tainted name, and if it defers to an
\&\s-1AUTOLOAD\s0 function, then \f(CW$AUTOLOAD\fR will be (correctly) tainted.
(Rick Delaney)
.SH "Core Enhancements"
.IX Header "Core Enhancements"
.Sh "\fIstate()\fP variables"
.IX Subsection "state() variables"
A new class of variables has been introduced. State variables are similar
to \f(CW\*(C`my\*(C'\fR variables, but are declared with the \f(CW\*(C`state\*(C'\fR keyword in place of
\&\f(CW\*(C`my\*(C'\fR. They're visible only in their lexical scope, but their value is
persistent: unlike \f(CW\*(C`my\*(C'\fR variables, they're not undefined at scope entry,
but retain their previous value. (Rafael Garcia-Suarez)
.PP
To use state variables, one needs to enable them by using
.PP
.Vb 1
\&    use feature "state";
.Ve
.PP
or by using the \f(CW\*(C`\-E\*(C'\fR command-line switch in one-liners.
.PP
See \*(L"Persistent variables via \fIstate()\fR\*(R" in perlsub.
.Sh "\s-1\fIUNIVERSAL::DOES\s0()\fP"
.IX Subsection "UNIVERSAL::DOES()"
The \f(CW\*(C`UNIVERSAL\*(C'\fR class has a new method, \f(CW\*(C`DOES()\*(C'\fR. It has been added to
solve semantic problems with the \f(CW\*(C`isa()\*(C'\fR method. \f(CW\*(C`isa()\*(C'\fR checks for
inheritance, while \f(CW\*(C`DOES()\*(C'\fR has been designed to be overridden when
module authors use other types of relations between classes (in addition
to inheritance). (chromatic)
.PP
See \*(L"$obj\->\s-1DOES\s0( \s-1ROLE\s0 )\*(R" in \s-1UNIVERSAL\s0.
.Sh "Exceptions in constant folding"
.IX Subsection "Exceptions in constant folding"
The constant folding routine is now wrapped in an exception handler, and
if folding throws an exception (such as attempting to evaluate 0/0), perl
now retains the current optree, rather than aborting the whole program.
(Nicholas Clark, Dave Mitchell)
.ie n .Sh "Source filters in @INC"
.el .Sh "Source filters in \f(CW@INC\fP"
.IX Subsection "Source filters in @INC"
It's possible to enhance the mechanism of subroutine hooks in \f(CW@INC\fR by
adding a source filter on top of the filehandle opened and returned by the
hook. This feature was planned a long time ago, but wasn't quite working
until now. See \*(L"require\*(R" in perlfunc for details. (Nicholas Clark)
.Sh "\s-1MAD\s0"
.IX Subsection "MAD"
\&\s-1MAD\s0, which stands for \fIMisc Attribute Decoration\fR, is a
still-in-development work leading to a Perl 5 to Perl 6 converter. To
enable it, it's necessary to pass the argument \f(CW\*(C`\-Dmad\*(C'\fR to Configure. The
obtained perl isn't binary compatible with a regular perl 5.9.4, and has
space and speed penalties; moreover not all regression tests still pass
with it. (Larry Wall, Nicholas Clark)
.SH "Modules and Pragmas"
.IX Header "Modules and Pragmas"
.IP "\(bu" 4