perl591delta.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 "PERL591DELTA 1"
.TH PERL591DELTA 1 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
perl591delta \- what is new for perl v5.9.1
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This document describes differences between the 5.9.0 and the 5.9.1
development releases. See perl590delta for the differences between
5.8.0 and 5.9.0.
.SH "Incompatible Changes"
.IX Header "Incompatible Changes"
.Sh "\fIsubstr()\fP lvalues are no longer fixed-length"
.IX Subsection "substr() lvalues are no longer fixed-length"
The lvalues returned by the three argument form of \fIsubstr()\fR used to be a
\&\*(L"fixed length window\*(R" on the original string. In some cases this could
cause surprising action at distance or other undefined behaviour. Now the
length of the window adjusts itself to the length of the string assigned to
it.
.ie n .Sh "The "":unique"" attribute is only meaningful for globals"
.el .Sh "The \f(CW:unique\fP attribute is only meaningful for globals"
.IX Subsection "The :unique attribute is only meaningful for globals"
Now applying \f(CW\*(C`:unique\*(C'\fR to lexical variables and to subroutines will
result in a compilation error.
.SH "Core Enhancements"
.IX Header "Core Enhancements"
.ie n .Sh "Lexical $_"
.el .Sh "Lexical \f(CW$_\fP"
.IX Subsection "Lexical $_"
The default variable \f(CW$_\fR can now be lexicalized, by declaring it like
any other lexical variable, with a simple
.PP
.Vb 1
\&    my $_;
.Ve
.PP
The operations that default on \f(CW$_\fR will use the lexically-scoped
version of \f(CW$_\fR when it exists, instead of the global \f(CW$_\fR.
.PP
In a \f(CW\*(C`map\*(C'\fR or a \f(CW\*(C`grep\*(C'\fR block, if \f(CW$_\fR was previously my'ed, then the
\&\f(CW$_\fR inside the block is lexical as well (and scoped to the block).
.PP
In a scope where \f(CW$_\fR has been lexicalized, you can still have access to
the global version of \f(CW$_\fR by using \f(CW$::_\fR, or, more simply, by
overriding the lexical declaration with \f(CW\*(C`our $_\*(C'\fR.
.Sh "Tied hashes in scalar context"
.IX Subsection "Tied hashes in scalar context"
As of perl 5.8.2/5.9.0, tied hashes did not return anything useful in
scalar context, for example when used as boolean tests:
.PP
.Vb 1
\&        if (%tied_hash) { ... }
.Ve
.PP
The old nonsensical behaviour was always to return false,
regardless of whether the hash is empty or has elements.
.PP
There is now an interface for the implementors of tied hashes to implement
the behaviour of a hash in scalar context, via the \s-1SCALAR\s0 method (see
perltie).  Without a \s-1SCALAR\s0 method, perl will try to guess whether
the hash is empty, by testing if it's inside an iteration (in this case
it can't be empty) or by calling \s-1FIRSTKEY\s0.
.Sh "Formats"
.IX Subsection "Formats"
Formats were improved in several ways. A new field, \f(CW\*(C`^*\*(C'\fR, can be used for
variable-width, one-line-at-a-time text. Null characters are now handled
correctly in picture lines. Using \f(CW\*(C`@#\*(C'\fR and \f(CW\*(C`~~\*(C'\fR together will now
produce a compile-time error, as those format fields are incompatible.
perlform has been improved, and miscellaneous bugs fixed.
.Sh "Stacked filetest operators"
.IX Subsection "Stacked filetest operators"
As a new form of syntactic sugar, it's now possible to stack up filetest
operators. You can now write \f(CW\*(C`\-f \-w \-x $file\*(C'\fR in a row to mean
\&\f(CW\*(C`\-x $file && \-w _ && \-f _\*(C'\fR. See \*(L"\-X\*(R" in perlfunc.
.SH "Modules and Pragmata"
.IX Header "Modules and Pragmata"
.IP "Benchmark" 4
.IX Item "Benchmark"
In \f(CW\*(C`Benchmark\*(C'\fR, \fIcmpthese()\fR and \fItimestr()\fR now use the time statistics of
children instead of parent when the selected style is 'nop'.
.IP "Carp" 4