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42e73e1c | 1 | =head1 NAME |
2 | ||
3 | perlexperiment - A listing of experimental features in Perl | |
4 | ||
5 | =head1 DESCRIPTION | |
6 | ||
7 | This document lists the current and past experimental features in the perl | |
d1558b3e | 8 | core. Although all of these are documented with their appropriate topics, |
42e73e1c | 9 | this succinct listing gives you an overview and basic facts about their |
10 | status. | |
11 | ||
fe8d2675 | 12 | So far we've merely tried to find and list the experimental features and infer |
d1558b3e | 13 | their inception, versions, etc. There's a lot of speculation here. |
42e73e1c | 14 | |
15 | =head2 Current experiments | |
16 | ||
17 | =over 8 | |
18 | ||
42e73e1c | 19 | =item C<our> can now have an experimental optional attribute C<unique> |
20 | ||
21 | Introduced in Perl 5.8.0 | |
22 | ||
d1558b3e FC |
23 | Deprecated in Perl 5.10.0 |
24 | ||
02ba9cac RS |
25 | The ticket for this feature is |
26 | L<[perl #119313]|https://rt.perl.org/rt3/Ticket/Display.html?id=119313>. | |
27 | ||
51c34fa4 RS |
28 | =item Smart match (C<~~>) |
29 | ||
30 | Introduced in Perl 5.10.0 | |
31 | ||
32 | Modified in Perl 5.10.1, 5.12.0 | |
33 | ||
34 | Using this feature triggers warnings in the category | |
35 | C<experimental::smartmatch>. | |
36 | ||
c77be11b RS |
37 | The ticket for this feature is |
38 | L<[perl #119317]|https://rt.perl.org/rt3/Ticket/Display.html?id=119317>. | |
39 | ||
51c34fa4 RS |
40 | =item Lexical C<$_> |
41 | ||
42 | Introduced in Perl 5.10.0 | |
43 | ||
44 | Using this feature triggers warnings in the category | |
45 | C<experimental::lexical_topic>. | |
46 | ||
a291f3c5 RS |
47 | The ticket for this feature is |
48 | L<[perl #119315]|https://rt.perl.org/rt3/Ticket/Display.html?id=119315>. | |
49 | ||
51c34fa4 RS |
50 | =item Pluggable keywords |
51 | ||
57b503da RS |
52 | The ticket for this feature is |
53 | L<[perl #119455]|https://rt.perl.org/rt3/Ticket/Display.html?id=119455>. | |
54 | ||
51c34fa4 RS |
55 | See L<perlapi/PL_keyword_plugin> for the mechanism. |
56 | ||
57 | Introduced in: Perl 5.11.2 | |
58 | ||
59 | =item Array and hash container functions accept references | |
60 | ||
61 | Introduced in Perl 5.14.0 | |
62 | ||
3ae5c8a2 RS |
63 | The ticket for this feature is |
64 | L<[perl #119437]|https://rt.perl.org/rt3/Ticket/Display.html?id=119437>. | |
65 | ||
51c34fa4 RS |
66 | =item Lexical subroutines |
67 | ||
68 | Introduced in: Perl 5.18 | |
69 | ||
70 | See also: L<perlsub/Lexical Subroutines> | |
71 | ||
72 | Using this feature triggers warnings in the category | |
73 | C<experimental::lexical_subs>. | |
74 | ||
bd5908dd RS |
75 | The ticket for this feature is |
76 | L<[perl #120085]|https://rt.perl.org/rt3/Ticket/Display.html?id=120085>. | |
77 | ||
51c34fa4 RS |
78 | =item Regular Expression Set Operations |
79 | ||
80 | Introduced in: Perl 5.18 | |
81 | ||
ca888027 RS |
82 | The ticket for this feature is |
83 | L<[perl #119451]|https://rt.perl.org/rt3/Ticket/Display.html?id=119451>. | |
84 | ||
51c34fa4 RS |
85 | See also: L<perlrecharclass/Extended Bracketed Character Classes> |
86 | ||
87 | Using this feature triggers warnings in the category | |
88 | C<experimental::regex_sets>. | |
89 | ||
3602d7b6 RS |
90 | =item C<\s> in regexp matches vertical tab |
91 | ||
92 | Introduced in Perl 5.18 | |
51c34fa4 | 93 | |
afdb3b14 RS |
94 | =item Subroutine signatures |
95 | ||
96 | Introduced in Perl 5.20.0 | |
97 | ||
98 | Using this feature triggers warnings in the category | |
99 | C<experimental::signatures>. | |
100 | ||
101 | The ticket for this feature is | |
102 | L<[perl #121481]|https://rt.perl.org/Ticket/Display.html?id=121481>. | |
103 | ||
01582e5c RS |
104 | =item Postfix dereference syntax |
105 | ||
106 | Introduced in Perl 5.20.0 | |
107 | ||
108 | Using this feature triggers warnings in the category | |
109 | C<experimental::postderef>. | |
110 | ||
111 | The ticket for this feature is | |
112 | L<[perl #120162]|https://rt.perl.org:443/rt3/Ticket/Display.html?id=120162>. | |
113 | ||
baabe3fb | 114 | =item Aliasing via reference |
82848c10 FC |
115 | |
116 | Introduced in Perl 5.22.0 | |
117 | ||
118 | Using this feature triggers warnings in the category | |
baabe3fb | 119 | C<experimental::refaliasing>. |
82848c10 FC |
120 | |
121 | The ticket for this feature is | |
122 | L<[perl #122947]|https://rt.perl.org/rt3/Ticket/Display.html?id=122947>. | |
123 | ||
124 | See also: L<perlref/Assigning to References> | |
125 | ||
99734069 FC |
126 | =item The "const" attribute |
127 | ||
128 | Introduced in Perl 5.22.0 | |
129 | ||
130 | Using this feature triggers warnings in the category | |
131 | C<experimental::const_attr>. | |
132 | ||
133 | The ticket for this feature is | |
1e50fc51 | 134 | L<[perl #123630]|https://rt.perl.org/rt3/Ticket/Display.html?id=123630>. |
99734069 FC |
135 | |
136 | See also: L<perlsub/Constant Functions> | |
137 | ||
706c19b7 | 138 | =item The <:win32> IO pseudolayer |
42e73e1c | 139 | |
a532d4a5 RS |
140 | The ticket for this feature is |
141 | L<[perl #119453]|https://rt.perl.org/rt3/Ticket/Display.html?id=119453>. | |
142 | ||
42e73e1c | 143 | See also L<perlrun> |
144 | ||
42e73e1c | 145 | =item There is an C<installhtml> target in the Makefile. |
afb63838 RS |
146 | |
147 | The ticket for this feature is | |
148 | L<[perl #116487]|https://rt.perl.org/rt3/Ticket/Display.html?id=116487>. | |
42e73e1c | 149 | |
150 | =item Unicode in Perl on EBCDIC | |
151 | ||
42e73e1c | 152 | =back |
153 | ||
154 | =head2 Accepted features | |
155 | ||
156 | These features were so wildly successful and played so well with others that | |
157 | we decided to remove their experimental status and admit them as full, stable | |
51c34fa4 | 158 | features in the world of Perl, lavishing all the benefits and luxuries thereof. |
42e73e1c | 159 | They are also awarded +5 Stability and +3 Charisma. |
160 | ||
161 | =over 8 | |
162 | ||
51c34fa4 | 163 | =item 64-bit support |
42e73e1c | 164 | |
51c34fa4 | 165 | Introduced in Perl 5.005 |
fe8d2675 | 166 | |
51c34fa4 | 167 | =item die accepts a reference |
fe8d2675 | 168 | |
51c34fa4 | 169 | Introduced in Perl 5.005 |
fe8d2675 AT |
170 | |
171 | =item DB module | |
172 | ||
173 | Introduced in Perl 5.6.0 | |
174 | ||
175 | See also L<perldebug>, L<perldebtut> | |
176 | ||
177 | =item Weak references | |
178 | ||
179 | Introduced in Perl 5.6.0 | |
180 | ||
181 | =item Internal file glob | |
182 | ||
183 | Introduced in Perl 5.6.0 | |
184 | ||
51c34fa4 | 185 | =item fork() emulation |
fe8d2675 | 186 | |
51c34fa4 | 187 | Introduced in Perl 5.6.1 |
fe8d2675 | 188 | |
51c34fa4 | 189 | See also L<perlfork> |
fe8d2675 | 190 | |
3a0e7915 RS |
191 | =item -Dusemultiplicity -Duseithreads |
192 | ||
193 | Introduced in Perl 5.6.0 | |
194 | ||
195 | Accepted in Perl 5.8.0 | |
196 | ||
36d2f798 RS |
197 | =item Support for long doubles |
198 | ||
199 | Introduced in Perl 5.6.0 | |
200 | ||
201 | Accepted in Perl 5.8.1 | |
202 | ||
51c34fa4 RS |
203 | =item The C<\N> regex character class |
204 | ||
205 | The C<\N> character class, not to be confused with the named character | |
206 | sequence C<\N{NAME}>, denotes any non-newline character in a regular | |
207 | expression. | |
208 | ||
3cb3bd66 RS |
209 | Introduced in Perl 5.12 |
210 | ||
211 | Exact version of acceptance unclear, but no later than Perl 5.18. | |
fe8d2675 | 212 | |
83f32aba RS |
213 | =item C<(?{code})> and C<(??{ code })> |
214 | ||
215 | Introduced in Perl 5.6.0 | |
216 | ||
217 | Accepted in Perl 5.20.0 | |
218 | ||
219 | See also L<perlre> | |
220 | ||
e48e70eb RS |
221 | =item Linux abstract Unix domain sockets |
222 | ||
223 | Introduced in Perl 5.9.2 | |
224 | ||
225 | Accepted before Perl 5.20.0. The Socket library is now primarily maintained | |
226 | on CPAN, rather than in the perl core. | |
227 | ||
228 | See also L<Socket> | |
229 | ||
af7c9f88 RS |
230 | =item Lvalue subroutines |
231 | ||
232 | Introduced in Perl 5.6.0 | |
233 | ||
234 | Accepted in Perl 5.20.0 | |
235 | ||
236 | See also L<perlsub> | |
237 | ||
b387afbc RS |
238 | =item Backtracking control verbs |
239 | ||
240 | C<(*ACCEPT)> | |
241 | ||
242 | Introduced in: Perl 5.10 | |
243 | ||
244 | Accepted in Perl 5.20.0 | |
245 | ||
8a7bc862 RS |
246 | =item The <:pop> IO pseudolayer |
247 | ||
248 | See also L<perlrun> | |
249 | ||
250 | Accepted in Perl 5.20.0 | |
251 | ||
42e73e1c | 252 | =back |
253 | ||
254 | =head2 Removed features | |
255 | ||
256 | These features are no longer considered experimental and their functionality | |
257 | has disappeared. It's your own fault if you wrote production programs using | |
258 | these features after we explicitly told you not to (see L<perlpolicy>). | |
259 | ||
260 | =over 8 | |
261 | ||
51c34fa4 | 262 | =item 5.005-style threading |
42e73e1c | 263 | |
51c34fa4 | 264 | Introduced in Perl 5.005 |
42e73e1c | 265 | |
51c34fa4 | 266 | Removed in Perl 5.10 |
42e73e1c | 267 | |
51c34fa4 | 268 | =item perlcc |
fe8d2675 | 269 | |
51c34fa4 | 270 | Introduced in Perl 5.005 |
fe8d2675 | 271 | |
51c34fa4 | 272 | Moved from Perl 5.9.0 to CPAN |
fe8d2675 | 273 | |
51c34fa4 | 274 | =item The pseudo-hash data type |
fe8d2675 | 275 | |
51c34fa4 | 276 | Introduced in Perl 5.6.0 |
fe8d2675 | 277 | |
51c34fa4 | 278 | Removed in Perl 5.9.0 |
fe8d2675 AT |
279 | |
280 | =item GetOpt::Long Options can now take multiple values at once (experimental) | |
281 | ||
282 | C<Getopt::Long> upgraded to version 2.35 | |
283 | ||
284 | Removed in Perl 5.8.8 | |
285 | ||
51c34fa4 | 286 | =item Assertions |
fe8d2675 | 287 | |
51c34fa4 | 288 | The C<-A> command line switch |
fe8d2675 | 289 | |
51c34fa4 | 290 | Introduced in Perl 5.9.0 |
fe8d2675 | 291 | |
51c34fa4 | 292 | Removed in Perl 5.9.5 |
fe8d2675 | 293 | |
51c34fa4 | 294 | =item Test::Harness::Straps |
fe8d2675 | 295 | |
51c34fa4 | 296 | Moved from Perl 5.10.1 to CPAN |
fe8d2675 | 297 | |
51c34fa4 | 298 | =item C<legacy> |
fe8d2675 | 299 | |
51c34fa4 | 300 | The experimental C<legacy> pragma was swallowed by the C<feature> pragma. |
fe8d2675 | 301 | |
51c34fa4 RS |
302 | Introduced in: 5.11.2 |
303 | ||
304 | Removed in: 5.11.3 | |
fe8d2675 | 305 | |
42e73e1c | 306 | =back |
307 | ||
2b0121e1 AS |
308 | =head1 SEE ALSO |
309 | ||
310 | For a complete list of features check L<feature>. | |
311 | ||
42e73e1c | 312 | =head1 AUTHORS |
313 | ||
314 | brian d foy C<< <brian.d.foy@gmail.com> >> | |
315 | ||
fe8d2675 AT |
316 | SE<eacute>bastien Aperghis-Tramoni C<< <saper@cpan.org> >> |
317 | ||
42e73e1c | 318 | =head1 COPYRIGHT |
319 | ||
320 | Copyright 2010, brian d foy C<< <brian.d.foy@gmail.com> >> | |
321 | ||
322 | =head1 LICENSE | |
323 | ||
324 | You can use and redistribute this document under the same terms as Perl | |
325 | itself. | |
326 | ||
327 | =cut |