perl595delta.pod

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=item from_hex(), from_oct(), and from_bin()

=item as_oct()

=back

In addition, the default math-backend (Calc (Perl) and FastCalc (XS)) now
support storing numbers in parts with 9 digits instead of 7 on Perls with
either 64bit integer or long double support. This means math operations
scale better and are thus faster for really big numbers.

=head2 New Core Modules

=over 4

=item *

C<Locale::Maketext::Simple>, needed by CPANPLUS, is a simple wrapper around
C<Locale::Maketext::Lexicon>. Note that C<Locale::Maketext::Lexicon> isn't
included in the perl core; the behaviour of C<Locale::Maketext::Simple>
gracefully degrades when the later isn't present.

=item *

C<Params::Check> implements a generic input parsing/checking mechanism. It
is used by CPANPLUS.

=item *

C<Term::UI> simplifies the task to ask questions at a terminal prompt.

=item *

C<Object::Accessor> provides an interface to create per-object accessors.

=item *

C<Module::Pluggable> is a simple framework to create modules that accept
pluggable sub-modules.

=item *

C<Module::Load::Conditional> provides simple ways to query and possibly
load installed modules.

=item *

C<Time::Piece> provides an object oriented interface to time functions,
overriding the built-ins localtime() and gmtime().

=item *

C<IPC::Cmd> helps to find and run external commands, possibly
interactively.

=item *

C<File::Fetch> provide a simple generic file fetching mechanism.

=item *

C<Log::Message> and C<Log::Message::Simple> are used by the log facility
of C<CPANPLUS>.

=item *

C<Archive::Extract> is a generic archive extraction mechanism
for F<.tar> (plain, gziped or bzipped) or F<.zip> files.

=item *

C<CPANPLUS> provides an API and a command-line tool to access the CPAN
mirrors.

=back

=head2 Module changes

=over 4

=item C<assertions>

The C<assertions> pragma, its submodules C<assertions::activate> and
C<assertions::compat> and the B<-A> command-line switch have been removed.
The interface was not judged mature enough for inclusion in a stable
release.

=item C<base>

The C<base> pragma now warns if a class tries to inherit from itself.
(Curtis "Ovid" Poe)

=item C<strict> and C<warnings>

C<strict> and C<warnings> will now complain loudly if they are loaded via
incorrect casing (as in C<use Strict;>). (Johan Vromans)

=item C<warnings>

The C<warnings> pragma doesn't load C<Carp> anymore. That means that code
that used C<Carp> routines without having loaded it at compile time might
need to be adjusted; typically, the following (faulty) code won't work
anymore, and will require parentheses to be added after the function name:

    use warnings;
    require Carp;
    Carp::confess "argh";

=item C<less>

C<less> now does something useful (or at least it tries to). In fact, it
has been turned into a lexical pragma. So, in your modules, you can now
test whether your users have requested to use less CPU, or less memory,
less magic, or maybe even less fat. See L<less> for more. (Joshua ben
Jore)

=item C<Attribute::Handlers>

C<Attribute::Handlers> can now report the caller's file and line number.
(David Feldman)

=item C<B::Lint>

C<B::Lint> is now based on C<Module::Pluggable>, and so can be extended
with plugins. (Joshua ben Jore)

=item C<B>

It's now possible to access the lexical pragma hints (C<%^H>) by using the
method B::COP::hints_hash(). It returns a C<B::RHE> object, which in turn
can be used to get a hash reference via the method B::RHE::HASH(). (Joshua
ben Jore)

=for p5p XXX document this in B.pm too

=item C<Thread>

As the old 5005thread threading model has been removed, in favor of the
ithreads scheme, the C<Thread> module is now a compatibility wrapper, to
be used in old code only. It has been removed from the default list of
dynamic extensions.

=back

=head1 Utility Changes

=head2 C<cpanp>

C<cpanp>, the CPANPLUS shell, has been added. (C<cpanp-run-perl>, an
helper for CPANPLUS operation, has been added too, but isn't intended for
direct use).

=head2 C<cpan2dist>

C<cpan2dist> is a new utility, that comes with CPANPLUS. It's a tool to
create distributions (or packages) from CPAN modules.

=head2 C<pod2html>

The output of C<pod2html> has been enhanced to be more customizable via
CSS. Some formatting problems were also corrected. (Jari Aalto)

=head1 Documentation

=head2 New manpage, perlunifaq

A new manual page, L<perlunifaq> (the Perl Unicode FAQ), has been added
(Juerd Waalboer).

=head1 Performance Enhancements

=head1 Installation and Configuration Improvements

=head2 C++ compatibility

Efforts have been made to make perl and the core XS modules compilable
with various C++ compilers (although the situation is not perfect with
some of the compilers on some of the platforms tested.)

=head2 Visual C++

Perl now can be compiled with Microsoft Visual C++ 2005.

=head2 Static build on Win32

It's now possible to build a C<perl-static.exe> that doesn't depend
on C<perl59.dll> on Win32. See the Win32 makefiles for details.
(Vadim Konovalov)

=head2 win32 builds

All win32 builds (MS-Win, WinCE) have been merged and cleaned up.

=head2 C<d_pseudofork> and C<d_printf_format_null>

A new configuration variable, available as C<$Config{d_pseudofork}> in
the L<Config> module, has been added, to distinguish real fork() support
from fake pseudofork used on Windows platforms.

A new configuration variable, C<d_printf_format_null>, has been added, 
to see if printf-like formats are allowed to be NULL.

=head2 Help

C<Configure -h> has been extended with the most used option.

Much less 'Whoa there' messages.

=head2 64bit systems

Better detection of 64bit(only) systems, and setting all the (library)
paths accordingly.

=head2 Ports

Perl has been reported to work on MidnightBSD.

Support for Cray XT4 Catamount/Qk has been added.

Vendor patches have been merged for RedHat and GenToo.

=head1 Selected Bug Fixes

PerlIO::scalar will now prevent writing to read-only scalars. Moreover,
seek() is now supported with PerlIO::scalar-based filehandles, the
underlying string being zero-filled as needed. (Rafael, Jarkko Hietaniemi)

study() never worked for UTF-8 strings, but could lead to false results.
It's now a no-op on UTF-8 data. (Yves Orton)

The signals SIGILL, SIGBUS and SIGSEGV are now always delivered in an
"unsafe" manner (contrary to other signals, that are deferred until the
perl interpreter reaches a reasonably stable state; see
L<perlipc/"Deferred Signals (Safe Signals)">). (Rafael)

When a module or a file is loaded through an @INC-hook, and when this hook
has set a filename entry in %INC, __FILE__ is now set for this module
accordingly to the contents of that %INC entry. (Rafael)

The C<-w> and C<-t> switches can now be used together without messing
up what categories of warnings are activated or not. (Rafael)

Duping a filehandle which has the C<:utf8> PerlIO layer set will now
properly carry that layer on the duped filehandle. (Rafael)

Localizing an hash element whose key was given as a variable didn't work
correctly if the variable was changed while the local() was in effect (as
in C<local $h{$x}; ++$x>). (Bo Lindbergh)

=head1 New or Changed Diagnostics

=head2 Deprecations

Two deprecation warnings have been added: (Rafael)

    Opening dirhandle %s also as a file
    Opening filehandle %s also as a directory

=head1 Changed Internals

The anonymous hash and array constructors now take 1 op in the optree
instead of 3, now that pp_anonhash and pp_anonlist return a reference to
an hash/array when the op is flagged with OPf_SPECIAL (Nicholas Clark).

=for p5p XXX have we some docs on how to create regexp engine plugins, since that's now possible ? (perlreguts)

=for p5p XXX new BIND SV type, #29544, #29642

=head1 Known Problems

=head2 Platform Specific Problems

=head1 Reporting Bugs

If you find what you think is a bug, you might check the articles
recently posted to the comp.lang.perl.misc newsgroup and the perl
bug database at http://rt.perl.org/rt3/ .  There may also be
information at http://www.perl.org/ , the Perl Home Page.

If you believe you have an unreported bug, please run the B<perlbug>
program included with your release.  Be sure to trim your bug down
to a tiny but sufficient test case.  Your bug report, along with the
output of C<perl -V>, will be sent off to [e-mail] to be
analysed by the Perl porting team.

=head1 SEE ALSO

The F<Changes> file for exhaustive details on what changed.

The F<INSTALL> file for how to build Perl.

The F<README> file for general stuff.

The F<Artistic> and F<Copying> files for copyright information.

=cut