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PERLEXPERIMENT
Section: Perl Programmers Reference Guide (1) Updated: 2017-06-30 Index
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NAME
perlexperiment - A listing of experimental features in Perl
DESCRIPTION
This document lists the current and past experimental features in the perl
core. Although all of these are documented with their appropriate topics,
this succinct listing gives you an overview and basic facts about their
status.
So far we've merely tried to find and list the experimental features and infer
their inception, versions, etc. There's a lot of speculation here.
Current experiments
- our can now have an experimental optional attribute unique
-
Introduced in Perl 5.8.0
Deprecated in Perl 5.10.0
The ticket for this feature is
[perl #119313] <https://rt.perl.org/rt3/Ticket/Display.html?id=119313>.
- Smart match (~~)
-
Introduced in Perl 5.10.0
Modified in Perl 5.10.1, 5.12.0
Using this feature triggers warnings in the category
"experimental::smartmatch".
The ticket for this feature is
[perl #119317] <https://rt.perl.org/rt3/Ticket/Display.html?id=119317>.
- Pluggable keywords
-
The ticket for this feature is
[perl #119455] <https://rt.perl.org/rt3/Ticket/Display.html?id=119455>.
See ``PL_keyword_plugin'' in perlapi for the mechanism.
Introduced in Perl 5.11.2
- Lexical subroutines
-
Introduced in Perl 5.18
See also: ``Lexical Subroutines'' in perlsub
Using this feature triggers warnings in the category
"experimental::lexical_subs".
The ticket for this feature is
[perl #120085] <https://rt.perl.org/rt3/Ticket/Display.html?id=120085>.
- Regular Expression Set Operations
-
Introduced in Perl 5.18
The ticket for this feature is
[perl #119451] <https://rt.perl.org/rt3/Ticket/Display.html?id=119451>.
See also: ``Extended Bracketed Character Classes'' in perlrecharclass
Using this feature triggers warnings in the category
"experimental::regex_sets".
- Subroutine signatures
-
Introduced in Perl 5.20.0
Using this feature triggers warnings in the category
"experimental::signatures".
The ticket for this feature is
[perl #121481] <https://rt.perl.org/Ticket/Display.html?id=121481>.
- Aliasing via reference
-
Introduced in Perl 5.22.0
Using this feature triggers warnings in the category
"experimental::refaliasing".
The ticket for this feature is
[perl #122947] <https://rt.perl.org/rt3/Ticket/Display.html?id=122947>.
See also: ``Assigning to References'' in perlref
- The const attribute
-
Introduced in Perl 5.22.0
Using this feature triggers warnings in the category
"experimental::const_attr".
The ticket for this feature is
[perl #123630] <https://rt.perl.org/rt3/Ticket/Display.html?id=123630>.
See also: ``Constant Functions'' in perlsub
- use re 'strict';
-
Introduced in Perl 5.22.0
Using this feature triggers warnings in the category
"experimental::re_strict".
See ``'strict' mode'' in re
- String- and number-specific bitwise operators
-
Introduced in Perl 5.22.0
See also: ``Bitwise String Operators'' in perlop
Using this feature triggers warnings in the category
"experimental::bitwise".
The ticket for this feature is
[perl #123707] <https://rt.perl.org/rt3/Ticket/Display.html?id=123707>.
- The <:win32> IO pseudolayer
-
The ticket for this feature is
[perl #119453] <https://rt.perl.org/rt3/Ticket/Display.html?id=119453>.
See also perlrun
- There is an installhtml target in the Makefile.
-
The ticket for this feature is
[perl #116487] <https://rt.perl.org/rt3/Ticket/Display.html?id=116487>.
- Unicode in Perl on EBCDIC
-
Accepted features
These features were so wildly successful and played so well with others that
we decided to remove their experimental status and admit them as full, stable
features in the world of Perl, lavishing all the benefits and luxuries thereof.
They are also awarded +5 Stability and +3 Charisma.
- 64-bit support
-
Introduced in Perl 5.005
- die accepts a reference
-
Introduced in Perl 5.005
- DB module
-
Introduced in Perl 5.6.0
See also perldebug, perldebtut
- Weak references
-
Introduced in Perl 5.6.0
- Internal file glob
-
Introduced in Perl 5.6.0
- fork() emulation
-
Introduced in Perl 5.6.1
See also perlfork
- -Dusemultiplicity -Duseithreads
-
Introduced in Perl 5.6.0
Accepted in Perl 5.8.0
- Support for long doubles
-
Introduced in Perl 5.6.0
Accepted in Perl 5.8.1
- The \N regex character class
-
The "\N" character class, not to be confused with the named character
sequence "\N{NAME}", denotes any non-newline character in a regular
expression.
Introduced in Perl 5.12
Exact version of acceptance unclear, but no later than Perl 5.18.
- (?{code}) and (??{ code })
-
Introduced in Perl 5.6.0
Accepted in Perl 5.20.0
See also perlre
- Linux abstract Unix domain sockets
-
Introduced in Perl 5.9.2
Accepted before Perl 5.20.0. The Socket library is now primarily maintained
on CPAN, rather than in the perl core.
See also Socket
- Lvalue subroutines
-
Introduced in Perl 5.6.0
Accepted in Perl 5.20.0
See also perlsub
- Backtracking control verbs
-
"(*ACCEPT)"
Introduced in Perl 5.10
Accepted in Perl 5.20.0
- The <:pop> IO pseudolayer
-
See also perlrun
Accepted in Perl 5.20.0
- \s in regexp matches vertical tab
-
Accepted in Perl 5.22.0
- Postfix dereference syntax
-
Introduced in Perl 5.20.0
Accepted in Perl 5.24.0
Removed features
These features are no longer considered experimental and their functionality
has disappeared. It's your own fault if you wrote production programs using
these features after we explicitly told you not to (see perlpolicy).
- 5.005-style threading
-
Introduced in Perl 5.005
Removed in Perl 5.10
- perlcc
-
Introduced in Perl 5.005
Moved from Perl 5.9.0 to CPAN
- The pseudo-hash data type
-
Introduced in Perl 5.6.0
Removed in Perl 5.9.0
- GetOpt::Long Options can now take multiple values at once (experimental)
-
"Getopt::Long" upgraded to version 2.35
Removed in Perl 5.8.8
- Assertions
-
The "-A" command line switch
Introduced in Perl 5.9.0
Removed in Perl 5.9.5
- Test::Harness::Straps
-
Moved from Perl 5.10.1 to CPAN
- legacy
-
The experimental "legacy" pragma was swallowed by the "feature" pragma.
Introduced in Perl 5.11.2
Removed in Perl 5.11.3
- Lexical $_
-
Using this feature triggered warnings in the category
"experimental::lexical_topic".
Introduced in Perl 5.10.0
Removed in Perl 5.24.0
- Array and hash container functions accept references
-
Using this feature triggered warnings in the category
"experimental::autoderef".
Superseded by ``Postfix dereference syntax''.
Introduced in Perl 5.14.0
Removed in Perl 5.24.0
SEE ALSO
For a complete list of features check feature.
AUTHORS
brian d foy "<brian.d.foy@gmail.com>"
Sebastien Aperghis-Tramoni "<saper@cpan.org>"
COPYRIGHT
Copyright 2010, brian d foy "<brian.d.foy@gmail.com>"
LICENSE
You can use and redistribute this document under the same terms as Perl
itself.
Index
- NAME
-
- DESCRIPTION
-
- Current experiments
-
- Accepted features
-
- Removed features
-
- SEE ALSO
-
- AUTHORS
-
- COPYRIGHT
-
- LICENSE
-
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