=head1 NAME
-perldelta - what is new for perl v5.9.5
+perl595delta - what is new for perl v5.9.5
=head1 DESCRIPTION
The regular expression construct C<(?p{})>, which was deprecated in perl
5.8, has been removed. Use C<(??{})> instead. (Rafael)
+=head2 Pseudo-hashes have been removed
+
+Support for pseudo-hashes has been removed from Perl 5.9. (The C<fields>
+pragma remains here, but uses an alternate implementation.)
+
=head2 Removal of the bytecode compiler and of perlcc
C<perlcc>, the byteloader and the supporting modules (B::C, B::CC,
The JPL (Java-Perl Linguo) has been removed from the perl sources tarball.
+=head2 Recursive inheritance detected earlier
+
+Perl will now immediately throw an exception if you modify any package's
+C<@ISA> in such a way that it would cause recursive inheritance.
+
+Previously, the exception would not occur until Perl attempted to make
+use of the recursive inheritance while resolving a method or doing a
+C<$foo-E<gt>isa($bar)> lookup.
+
=head1 Core Enhancements
=head2 Regular expressions
which is much more efficient. (Yves Orton)
+=item Vertical and horizontal whitespace, and linebreak
+
+Regular expressions now recognize the C<\v> and C<\h> escapes, that match
+vertical and horizontal whitespace, respectively. C<\V> and C<\H>
+logically match their complements.
+
+C<\R> matches a generic linebreak, that is, vertical whitespace, plus
+the multi-character sequence C<"\x0D\x0A">.
+
=back
=head2 The C<_> prototype
A new pragma, C<mro> (for Method Resolution Order) has been added. It
permits to switch, on a per-class basis, the algorithm that perl uses to
-find inherited methods in case of a mutiple inheritance hierachy. The
+find inherited methods in case of a multiple inheritance hierarchy. The
default MRO hasn't changed (DFS, for Depth First Search). Another MRO is
available: the C3 algorithm. See L<mro> for more information.
(Brandon Black)
+Note that, due to changes in the implementation of class hierarchy search,
+code that used to undef the C<*ISA> glob will most probably break. Anyway,
+undef'ing C<*ISA> had the side-effect of removing the magic on the @ISA
+array and should not have been done in the first place.
+
+=head2 bignum, bigint, bigrat
+
+The three numeric pragmas C<bignum>, C<bigint> and C<bigrat> are now
+lexically scoped. (Tels)
+
+=head2 Math::BigInt/Math::BigFloat
+
+Many bugs have been fixed; noteworthy are comparisons with NaN, which
+no longer warn about undef values.
+
+The following things are new:
+
+=over 4
+
+=item config()
+
+The config() method now also supports the calling-style
+C<< config('lib') >> in addition to C<< config()->{'lib'} >>.
+
+=item import()
+
+Upon import, using C<< lib => 'Foo' >> now warns if the low-level library
+cannot be found. To suppress the warning, you can use C<< try => 'Foo' >>
+instead. To convert the warning into a die, use C<< only => 'Foo' >>
+instead.
+
+=item roundmode common
+
+A rounding mode of C<common> is now supported.
+
+=back
+
+Also, support for the following methods has been added:
+
+=over 4
+
+=item bpi(), bcos(), bsin(), batan(), batan2()
+
+=item bmuladd()
+
+=item bexp(), bnok()
+
+=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<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.
=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.
=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
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
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
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,
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
=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
https://perl5.git.perl.org / perl5.git / blobdiff