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.\" ========================================================================
.\"
.IX Title "PERLEXPERIMENT 1"
.TH PERLEXPERIMENT 1 "2013-03-04" "perl v5.16.3" "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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.nh
.SH "NAME"
perlexperiment \- A listing of experimental features in Perl
.SH "DESCRIPTION"
.IX Header "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.
.PP
So far I've merely tried to find and list the experimental features and infer
their inception, versions, etc. There's a lot of speculation here.
.SS "Current experiments"
.IX Subsection "Current experiments"
.IP "\fIfork()\fR emulation" 8
.IX Item "fork() emulation"
Introduced in Perl 5.6.1
.Sp
See also perlfork
.IP "Weak references" 8
.IX Item "Weak references"
Introduced in Perl 5.6.0
.IP "Internal file glob" 8
.IX Item "Internal file glob"
Introduced in Perl 5.6.0
.Sp
Accepted in \s-1XXX\s0
.IP "64\-bit support" 8
.IX Item "64-bit support"
Introduced in Perl 5.005
.Sp
Accepted in \s-1XXX\s0
.IP "die accepts a reference" 8
.IX Item "die accepts a reference"
Introduced in Perl 5.005
.Sp
Accepted in Perl \s-1XXX\s0
.IP "Unicode support" 8
.IX Item "Unicode support"
Introduced in Perl 5.6.0
.Sp
Accepted in Perl 5.8.0 \s-1XXX\s0
.IP "\-Dusemultiplicity \-Dusethreads" 8
.IX Item "-Dusemultiplicity -Dusethreads"
Introduced in Perl 5.6.0
.IP "Long Doubles Still Don't Work In Solaris" 8
.IX Item "Long Doubles Still Don't Work In Solaris"
Introduced in Perl 5.7.0
.IP "GetOpt::Long Options can now take multiple values at once (experimental)" 8
.IX Item "GetOpt::Long Options can now take multiple values at once (experimental)"
\&\f(CW\*(C`Getopt::Long\*(C'\fR upgraded to version 2.35
.Sp
Removed in Perl 5.8.8
.IP "5.005\-style threading" 8
.IX Item "5.005-style threading"
Introduced in Perl 5.005
.Sp
Removed in Perl 5.10 \s-1XXX\s0
.IP "Test::Harness::Straps" 8
.IX Item "Test::Harness::Straps"
Removed in Perl 5.10.1
.IP "perlcc" 8
.IX Item "perlcc"
Introduced in Perl 5.005
.Sp
Removed in Perl 5.9.0
.ie n .IP """our"" can now have an experimental optional attribute ""unique""" 8
.el .IP "\f(CWour\fR can now have an experimental optional attribute \f(CWunique\fR" 8
.IX Item "our can now have an experimental optional attribute unique"
Introduced in Perl 5.8.0
.Sp
Deprecated in Perl 5.10.0
.IP "Assertions" 8
.IX Item "Assertions"
The \f(CW\*(C`\-A\*(C'\fR command line switch
.Sp
Introduced in Perl 5.9.0
.Sp
Removed in Perl 5.9.5
.IP "Linux abstract Unix domain sockets" 8
.IX Item "Linux abstract Unix domain sockets"
Introduced in Perl 5.9.2
.Sp
See also Socket
.IP "Pod::HTML2Pod" 8
.IX Item "Pod::HTML2Pod"
.PD 0
.IP "Pod::PXML" 8
.IX Item "Pod::PXML"
.IP "threads" 8
.IX Item "threads"
.IP "The <:pop> \s-1IO\s0 pseudolayer" 8
.IX Item "The <:pop> IO pseudolayer"
.PD
See also perlrun
.IP "The <:win32> \s-1IO\s0 pseudolayer" 8
.IX Item "The <:win32> IO pseudolayer"
See also perlrun
.IP "\s-1MLDBM\s0" 8
.IX Item "MLDBM"
See also perldsc
.IP "internal functions with M flag" 8
.IX Item "internal functions with M flag"
See also perlguts
.IP "lex_start \s-1API\s0" 8
.IX Item "lex_start API"
Introduced in Perl 5.13.7
.ie n .IP "internal \s-1API\s0 for %H" 8
.el .IP "internal \s-1API\s0 for \f(CW%H\fR" 8
.IX Item "internal API for %H"
Introduced in Perl 5.13.7
.Sp
See also \f(CW\*(C`cophh_\*(C'\fR in perlapi.
.IP "av_create_and_push" 8
.IX Item "av_create_and_push"
.PD 0
.IP "av_create_and_unshift_one" 8
.IX Item "av_create_and_unshift_one"
.IP "av_create_and_unshift_one" 8
.IX Item "av_create_and_unshift_one"
.IP "PL_keyword_plugin" 8
.IX Item "PL_keyword_plugin"
.IP "hv_iternext_flags" 8
.IX Item "hv_iternext_flags"
.IP "lex_bufutf8" 8
.IX Item "lex_bufutf8"
.IP "lex_discard_to" 8
.IX Item "lex_discard_to"
.IP "lex_grow_linestr" 8
.IX Item "lex_grow_linestr"
.IP "lex_next_chunk" 8
.IX Item "lex_next_chunk"
.IP "lex_peek_unichar" 8
.IX Item "lex_peek_unichar"
.IP "lex_read_space" 8
.IX Item "lex_read_space"
.IP "lex_read_to" 8
.IX Item "lex_read_to"
.IP "lex_read_unichar" 8
.IX Item "lex_read_unichar"
.IP "lex_stuff_pv" 8
.IX Item "lex_stuff_pv"
.IP "lex_stuff_pvn" 8
.IX Item "lex_stuff_pvn"
.IP "lex_stuff_pvs" 8
.IX Item "lex_stuff_pvs"
.IP "lex_stuff_sv" 8
.IX Item "lex_stuff_sv"
.IP "lex_unstuff" 8
.IX Item "lex_unstuff"
.IP "parse_fullstmt" 8
.IX Item "parse_fullstmt"
.IP "parse_stmtseq" 8
.IX Item "parse_stmtseq"
.IP "PL_parser\->bufend" 8
.IX Item "PL_parser->bufend"
.IP "PL_parser\->bufptr" 8
.IX Item "PL_parser->bufptr"
.IP "PL_parser\->linestart" 8
.IX Item "PL_parser->linestart"
.IP "PL_parser\->linestr" 8
.IX Item "PL_parser->linestr"
.IP "Perl_signbit" 8
.IX Item "Perl_signbit"
.IP "pad_findmy" 8
.IX Item "pad_findmy"
.IP "sv_utf8_decode" 8
.IX Item "sv_utf8_decode"
.IP "sv_utf8_downgrade" 8
.IX Item "sv_utf8_downgrade"
.IP "bytes_from_utf8" 8
.IX Item "bytes_from_utf8"
.IP "bytes_to_utf8" 8
.IX Item "bytes_to_utf8"
.IP "utf8_to_bytes" 8
.IX Item "utf8_to_bytes"
.IP "\s-1DB\s0 module" 8
.IX Item "DB module"
.PD
Introduced in Perl 5.6.0
.Sp
See also perldebug, perldebtut
.IP "The pseudo-hash data type" 8
.IX Item "The pseudo-hash data type"
Introduced in Perl 5.6.0
.IP "Lvalue subroutines" 8
.IX Item "Lvalue subroutines"
Introduced in Perl 5.6.0
.Sp
See also perlsub
.ie n .IP "There is an ""installhtml"" target in the Makefile." 8
.el .IP "There is an \f(CWinstallhtml\fR target in the Makefile." 8
.IX Item "There is an installhtml target in the Makefile."
.PD 0
.IP "Unicode in Perl on \s-1EBCDIC\s0" 8
.IX Item "Unicode in Perl on EBCDIC"
.ie n .IP """(?{code})""" 8
.el .IP "\f(CW(?{code})\fR" 8
.IX Item "(?{code})"
.PD
See also perlre
.ie n .IP """(??{ code })""" 8
.el .IP "\f(CW(??{ code })\fR" 8
.IX Item "(??{ code })"
See also perlre
.IP "Backtracking control verbs" 8
.IX Item "Backtracking control verbs"
\&\f(CW\*(C`(*ACCEPT)\*(C'\fR
.Sp
Introduced in: Perl 5.10
.Sp
See also: \*(L"Special Backtracking Control Verbs\*(R" in perlre
.IP "Code expressions, conditional expressions, and independent expressions in regexes" 8
.IX Item "Code expressions, conditional expressions, and independent expressions in regexes"
.PD 0
.ie n .IP "The ""\eN"" regex character class" 8
.el .IP "The \f(CW\eN\fR regex character class" 8
.IX Item "The N regex character class"
.PD
The \f(CW\*(C`\eN\*(C'\fR character class, not to be confused with the named character
sequence \f(CW\*(C`\eN{NAME}\*(C'\fR, denotes any non-newline character in a regular
expression.
.Sp
Introduced in: Perl 5.12
.Sp
See also:
.IP "gv_try_downgrade" 8
.IX Item "gv_try_downgrade"
See also perlintern
.IP "Experimental Support for Sun Studio Compilers for Linux \s-1OS\s0" 8
.IX Item "Experimental Support for Sun Studio Compilers for Linux OS"
See also perllinux
.IP "Pluggable keywords" 8
.IX Item "Pluggable keywords"
See \*(L"PL_keyword_plugin\*(R" in perlapi for the mechanism.
.Sp
Introduced in: Perl 5.11.2
.SS "Accepted features"
.IX Subsection "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.
.IP "(none yet identified)" 8
.IX Item "(none yet identified)"
.SS "Removed features"
.IX Subsection "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).
.ie n .IP """legacy""" 8
.el .IP "\f(CWlegacy\fR" 8
.IX Item "legacy"
The experimental \f(CW\*(C`legacy\*(C'\fR pragma was swallowed by the \f(CW\*(C`feature\*(C'\fR pragma.
.Sp
Introduced in: 5.11.2
.Sp
Removed in: 5.11.3
.SH "AUTHORS"
.IX Header "AUTHORS"
brian d foy \f(CW\*(C`<brian.d.foy@gmail.com>\*(C'\fR
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2010, brian d foy \f(CW\*(C`<brian.d.foy@gmail.com>\*(C'\fR
.SH "LICENSE"
.IX Header "LICENSE"
You can use and redistribute this document under the same terms as Perl
itself.
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