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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 | =head1 NAME
perlexperiment - A listing of experimental features in Perl
=head1 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.
=head2 Current experiments
=over 8
=item C<our> can now have an experimental optional attribute C<unique>
Introduced in Perl 5.8.0
Deprecated in Perl 5.10.0
The ticket for this feature is
L<[perl #119313]|https://rt.perl.org/rt3/Ticket/Display.html?id=119313>.
=item Smart match (C<~~>)
Introduced in Perl 5.10.0
Modified in Perl 5.10.1, 5.12.0
Using this feature triggers warnings in the category
C<experimental::smartmatch>.
The ticket for this feature is
L<[perl #119317]|https://rt.perl.org/rt3/Ticket/Display.html?id=119317>.
=item Lexical C<$_>
Introduced in Perl 5.10.0
Using this feature triggers warnings in the category
C<experimental::lexical_topic>.
The ticket for this feature is
L<[perl #119315]|https://rt.perl.org/rt3/Ticket/Display.html?id=119315>.
=item Pluggable keywords
The ticket for this feature is
L<[perl #119455]|https://rt.perl.org/rt3/Ticket/Display.html?id=119455>.
See L<perlapi/PL_keyword_plugin> for the mechanism.
Introduced in: Perl 5.11.2
=item Array and hash container functions accept references
Introduced in Perl 5.14.0
The ticket for this feature is
L<[perl #119437]|https://rt.perl.org/rt3/Ticket/Display.html?id=119437>.
=item Lexical subroutines
Introduced in: Perl 5.18
See also: L<perlsub/Lexical Subroutines>
Using this feature triggers warnings in the category
C<experimental::lexical_subs>.
The ticket for this feature is
L<[perl #120085]|https://rt.perl.org/rt3/Ticket/Display.html?id=120085>.
=item Regular Expression Set Operations
Introduced in: Perl 5.18
The ticket for this feature is
L<[perl #119451]|https://rt.perl.org/rt3/Ticket/Display.html?id=119451>.
See also: L<perlrecharclass/Extended Bracketed Character Classes>
Using this feature triggers warnings in the category
C<experimental::regex_sets>.
=item Subroutine signatures
Introduced in Perl 5.20.0
Using this feature triggers warnings in the category
C<experimental::signatures>.
The ticket for this feature is
L<[perl #121481]|https://rt.perl.org/Ticket/Display.html?id=121481>.
=item Postfix dereference syntax
Introduced in Perl 5.20.0
Using this feature triggers warnings in the category
C<experimental::postderef>.
The ticket for this feature is
L<[perl #120162]|https://rt.perl.org:443/rt3/Ticket/Display.html?id=120162>.
=item Aliasing via reference
Introduced in Perl 5.22.0
Using this feature triggers warnings in the category
C<experimental::refaliasing>.
The ticket for this feature is
L<[perl #122947]|https://rt.perl.org/rt3/Ticket/Display.html?id=122947>.
See also: L<perlref/Assigning to References>
=item The "const" attribute
Introduced in Perl 5.22.0
Using this feature triggers warnings in the category
C<experimental::const_attr>.
The ticket for this feature is
L<[perl #123630]|https://rt.perl.org/rt3/Ticket/Display.html?id=123630>.
See also: L<perlsub/Constant Functions>
=item use re 'strict';
Introduced in Perl 5.22.0
Using this feature triggers warnings in the category
C<experimental::re_strict>.
See L<re/'strict' mode>
=item String- and number-specific bitwise operators
Introduced in: Perl 5.22.0
See also: L<perlop/Bitwise String Operators>
Using this feature triggers warnings in the category
C<experimental::bitwise>.
The ticket for this feature is
L<[perl #123707]|https://rt.perl.org/rt3/Ticket/Display.html?id=123707>.
=item The <:win32> IO pseudolayer
The ticket for this feature is
L<[perl #119453]|https://rt.perl.org/rt3/Ticket/Display.html?id=119453>.
See also L<perlrun>
=item There is an C<installhtml> target in the Makefile.
The ticket for this feature is
L<[perl #116487]|https://rt.perl.org/rt3/Ticket/Display.html?id=116487>.
=item Unicode in Perl on EBCDIC
=back
=head2 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.
=over 8
=item 64-bit support
Introduced in Perl 5.005
=item die accepts a reference
Introduced in Perl 5.005
=item DB module
Introduced in Perl 5.6.0
See also L<perldebug>, L<perldebtut>
=item Weak references
Introduced in Perl 5.6.0
=item Internal file glob
Introduced in Perl 5.6.0
=item fork() emulation
Introduced in Perl 5.6.1
See also L<perlfork>
=item -Dusemultiplicity -Duseithreads
Introduced in Perl 5.6.0
Accepted in Perl 5.8.0
=item Support for long doubles
Introduced in Perl 5.6.0
Accepted in Perl 5.8.1
=item The C<\N> regex character class
The C<\N> character class, not to be confused with the named character
sequence C<\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.
=item C<(?{code})> and C<(??{ code })>
Introduced in Perl 5.6.0
Accepted in Perl 5.20.0
See also L<perlre>
=item 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 L<Socket>
=item Lvalue subroutines
Introduced in Perl 5.6.0
Accepted in Perl 5.20.0
See also L<perlsub>
=item Backtracking control verbs
C<(*ACCEPT)>
Introduced in: Perl 5.10
Accepted in Perl 5.20.0
=item The <:pop> IO pseudolayer
See also L<perlrun>
Accepted in Perl 5.20.0
=item C<\s> in regexp matches vertical tab
Accepted in Perl 5.22.0
=back
=head2 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 L<perlpolicy>).
=over 8
=item 5.005-style threading
Introduced in Perl 5.005
Removed in Perl 5.10
=item perlcc
Introduced in Perl 5.005
Moved from Perl 5.9.0 to CPAN
=item The pseudo-hash data type
Introduced in Perl 5.6.0
Removed in Perl 5.9.0
=item GetOpt::Long Options can now take multiple values at once (experimental)
C<Getopt::Long> upgraded to version 2.35
Removed in Perl 5.8.8
=item Assertions
The C<-A> command line switch
Introduced in Perl 5.9.0
Removed in Perl 5.9.5
=item Test::Harness::Straps
Moved from Perl 5.10.1 to CPAN
=item C<legacy>
The experimental C<legacy> pragma was swallowed by the C<feature> pragma.
Introduced in: 5.11.2
Removed in: 5.11.3
=back
=head1 SEE ALSO
For a complete list of features check L<feature>.
=head1 AUTHORS
brian d foy C<< <brian.d.foy@gmail.com> >>
SE<eacute>bastien Aperghis-Tramoni C<< <saper@cpan.org> >>
=head1 COPYRIGHT
Copyright 2010, brian d foy C<< <brian.d.foy@gmail.com> >>
=head1 LICENSE
You can use and redistribute this document under the same terms as Perl
itself.
=cut
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