=head1 NAME
-perldelta - what's new for perl v5.6.0
+perl56delta - what's new for perl v5.6.0
=head1 DESCRIPTION
# new features supported
}
-C<require> and C<use> also have some special magic to support such literals.
-They will be interpreted as a version rather than as a module name:
+C<require> and C<use> also have some special magic to support such
+literals, but this particular usage should be avoided because it leads to
+misleading error messages under versions of Perl which don't support vector
+strings. Using a true version number will ensure correct behavior in all
+versions of Perl:
- require v5.6.0; # croak if $^V lt v5.6.0
- use v5.6.0; # same, but croaks at compile-time
-
-Alternatively, the C<v> may be omitted if there is more than one dot:
-
- require 5.6.0;
- use 5.6.0;
+ require 5.006; # run time check for v5.6
+ use 5.006_001; # compile time check for v5.6.1
Also, C<sprintf> and C<printf> support the Perl-specific format flag C<%v>
to print ordinals of characters in arbitrary strings:
Send us a report via perlbug if you are affected by this.)
The v1.2.3 syntax is also now legal in Perl.
-See L<Support for strings represented as a vector of ordinals> for more on that.
+See L</Support for strings represented as a vector of ordinals> for more on that.
To cope with the new versioning system's use of at least three significant
digits for each version component, the method used for incrementing the
that with a C<use attrs> pragma in the body of the subroutine.
That can now be accomplished with declaration syntax, like this:
- sub mymethod : locked method ;
+ sub mymethod : locked method;
...
sub mymethod : locked method {
...
}
- sub othermethod :locked :method ;
+ sub othermethod :locked :method;
...
sub othermethod :locked :method {
...
is destroyed and all the weak references to the object are
automatically undef-ed.
-To use this feature, you need the WeakRef package from CPAN, which
+To use this feature, you need the Devel::WeakRef package from CPAN, which
contains additional documentation.
NOTE: This is an experimental feature. Details are subject to change.
This warns you that C<"fred@example.com"> is going to turn into
C<fred.com> if you don't backslash the C<@>.
-See http://www.plover.com/~mjd/perl/at-error.html for more details
+See http://perl.plover.com/at-error.html for more details
about the history here.
+=head2 @- and @+ provide starting/ending offsets of regex matches
+
+The new magic variables @- and @+ provide the starting and ending
+offsets, respectively, of $&, $1, $2, etc. See L<perlvar> for
+details.
+
=head1 Modules and Pragmata
=head2 Modules
=item B
The Perl Compiler suite has been extensively reworked for this
-release. More of the standard Perl testsuite passes when run
+release. More of the standard Perl test suite passes when run
under the Compiler, but there is still a significant way to
go to achieve production quality compiled executables.
=head1 NAME
- sample - Using GetOpt::Long and Pod::Usage
+ sample - Using Getopt::Long and Pod::Usage
=head1 SYNOPSIS
necessary APIs and datatypes, you should be able just to go ahead and
use them, for threads by Configure -Dusethreads, and for 64 bits
either explicitly by Configure -Duse64bitint or implicitly if your
-system has 64-bit wide datatypes. See also L<"64-bit support">.
+system has 64-bit wide datatypes. See also L</"64-bit support">.
=head2 Long Doubles
=head2 -Dusemorebits
You can enable both -Duse64bitint and -Duselongdouble with -Dusemorebits.
-See also L<"64-bit support">.
+See also L</"64-bit support">.
=head2 -Duselargefiles
(typically, files larger than two gigabytes). Perl will try to use these
APIs if you ask for -Duselargefiles.
-See L<"Large file support"> for more information.
+See L</"Large file support"> for more information.
=head2 installusrbinperl
The C<use attrs> pragma is now obsolete, and is only provided for
backward-compatibility. See L<perlsub/"Subroutine Attributes">.
-
=item Premature end of script headers
See Server error.
In Perl 5.6.0 and later, C<"$$1"> always means C<"${$1}">.
-=item
+=item delete(), each(), values() and C<\(%h)>
-delete(), values() and C<\(%h)> operate on aliases to values, not copies
+operate on aliases to values, not copies
-delete(), each(), values() and hashes in a list context return the actual
+delete(), each(), values() and hashes (e.g. C<\(%h)>)
+in a list context return the actual
values in the hash, instead of copies (as they used to in earlier
versions). Typical idioms for using these constructs copy the
returned values, but this can make a significant difference when
Perl, whose interfaces continue to match those of prior versions
(but subject to the other options described here).
-See L<perlguts/"The Perl API"> for detailed information on the
+
+See L<perlguts/Background and PERL_IMPLICIT_CONTEXT> for detailed information on the
ramifications of building Perl with this option.
NOTE: PERL_IMPLICIT_CONTEXT is automatically enabled whenever Perl is built
=item The DB module
-=item The regular expression constructs C<(?{ code })> and C<(??{ code })>
+=item The regular expression code constructs:
+
+C<(?{ code })> and C<(??{ code })>
=back
If you find what you think is a bug, you might check the
articles recently posted to the comp.lang.perl.misc newsgroup.
-There may also be information at http://www.perl.com/perl/, the Perl
+There may also be information at http://www.perl.com/perl/ , the Perl
Home Page.
If you believe you have an unreported bug, please run the B<perlbug>
https://perl5.git.perl.org / perl5.git / blobdiff