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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 | ||
afdb3b14 RS |
90 | =item Subroutine signatures |
91 | ||
92 | Introduced in Perl 5.20.0 | |
93 | ||
94 | Using this feature triggers warnings in the category | |
95 | C<experimental::signatures>. | |
96 | ||
97 | The ticket for this feature is | |
98 | L<[perl #121481]|https://rt.perl.org/Ticket/Display.html?id=121481>. | |
99 | ||
baabe3fb | 100 | =item Aliasing via reference |
82848c10 FC |
101 | |
102 | Introduced in Perl 5.22.0 | |
103 | ||
104 | Using this feature triggers warnings in the category | |
baabe3fb | 105 | C<experimental::refaliasing>. |
82848c10 FC |
106 | |
107 | The ticket for this feature is | |
108 | L<[perl #122947]|https://rt.perl.org/rt3/Ticket/Display.html?id=122947>. | |
109 | ||
110 | See also: L<perlref/Assigning to References> | |
111 | ||
99734069 FC |
112 | =item The "const" attribute |
113 | ||
114 | Introduced in Perl 5.22.0 | |
115 | ||
116 | Using this feature triggers warnings in the category | |
117 | C<experimental::const_attr>. | |
118 | ||
119 | The ticket for this feature is | |
1e50fc51 | 120 | L<[perl #123630]|https://rt.perl.org/rt3/Ticket/Display.html?id=123630>. |
99734069 FC |
121 | |
122 | See also: L<perlsub/Constant Functions> | |
123 | ||
1eac213a KW |
124 | =item use re 'strict'; |
125 | ||
126 | Introduced in Perl 5.22.0 | |
127 | ||
128 | Using this feature triggers warnings in the category | |
129 | C<experimental::re_strict>. | |
130 | ||
131 | See L<re/'strict' mode> | |
132 | ||
6207d112 FC |
133 | =item String- and number-specific bitwise operators |
134 | ||
135 | Introduced in: Perl 5.22.0 | |
136 | ||
137 | See also: L<perlop/Bitwise String Operators> | |
138 | ||
139 | Using this feature triggers warnings in the category | |
140 | C<experimental::bitwise>. | |
141 | ||
142 | The ticket for this feature is | |
0fe81779 | 143 | L<[perl #123707]|https://rt.perl.org/rt3/Ticket/Display.html?id=123707>. |
6207d112 | 144 | |
706c19b7 | 145 | =item The <:win32> IO pseudolayer |
42e73e1c | 146 | |
a532d4a5 RS |
147 | The ticket for this feature is |
148 | L<[perl #119453]|https://rt.perl.org/rt3/Ticket/Display.html?id=119453>. | |
149 | ||
42e73e1c | 150 | See also L<perlrun> |
151 | ||
42e73e1c | 152 | =item There is an C<installhtml> target in the Makefile. |
afb63838 RS |
153 | |
154 | The ticket for this feature is | |
155 | L<[perl #116487]|https://rt.perl.org/rt3/Ticket/Display.html?id=116487>. | |
42e73e1c | 156 | |
157 | =item Unicode in Perl on EBCDIC | |
158 | ||
42e73e1c | 159 | =back |
160 | ||
161 | =head2 Accepted features | |
162 | ||
163 | These features were so wildly successful and played so well with others that | |
164 | we decided to remove their experimental status and admit them as full, stable | |
51c34fa4 | 165 | features in the world of Perl, lavishing all the benefits and luxuries thereof. |
42e73e1c | 166 | They are also awarded +5 Stability and +3 Charisma. |
167 | ||
168 | =over 8 | |
169 | ||
51c34fa4 | 170 | =item 64-bit support |
42e73e1c | 171 | |
51c34fa4 | 172 | Introduced in Perl 5.005 |
fe8d2675 | 173 | |
51c34fa4 | 174 | =item die accepts a reference |
fe8d2675 | 175 | |
51c34fa4 | 176 | Introduced in Perl 5.005 |
fe8d2675 AT |
177 | |
178 | =item DB module | |
179 | ||
180 | Introduced in Perl 5.6.0 | |
181 | ||
182 | See also L<perldebug>, L<perldebtut> | |
183 | ||
184 | =item Weak references | |
185 | ||
186 | Introduced in Perl 5.6.0 | |
187 | ||
188 | =item Internal file glob | |
189 | ||
190 | Introduced in Perl 5.6.0 | |
191 | ||
51c34fa4 | 192 | =item fork() emulation |
fe8d2675 | 193 | |
51c34fa4 | 194 | Introduced in Perl 5.6.1 |
fe8d2675 | 195 | |
51c34fa4 | 196 | See also L<perlfork> |
fe8d2675 | 197 | |
3a0e7915 RS |
198 | =item -Dusemultiplicity -Duseithreads |
199 | ||
200 | Introduced in Perl 5.6.0 | |
201 | ||
202 | Accepted in Perl 5.8.0 | |
203 | ||
36d2f798 RS |
204 | =item Support for long doubles |
205 | ||
206 | Introduced in Perl 5.6.0 | |
207 | ||
208 | Accepted in Perl 5.8.1 | |
209 | ||
51c34fa4 RS |
210 | =item The C<\N> regex character class |
211 | ||
212 | The C<\N> character class, not to be confused with the named character | |
213 | sequence C<\N{NAME}>, denotes any non-newline character in a regular | |
214 | expression. | |
215 | ||
3cb3bd66 RS |
216 | Introduced in Perl 5.12 |
217 | ||
218 | Exact version of acceptance unclear, but no later than Perl 5.18. | |
fe8d2675 | 219 | |
83f32aba RS |
220 | =item C<(?{code})> and C<(??{ code })> |
221 | ||
222 | Introduced in Perl 5.6.0 | |
223 | ||
224 | Accepted in Perl 5.20.0 | |
225 | ||
226 | See also L<perlre> | |
227 | ||
e48e70eb RS |
228 | =item Linux abstract Unix domain sockets |
229 | ||
230 | Introduced in Perl 5.9.2 | |
231 | ||
232 | Accepted before Perl 5.20.0. The Socket library is now primarily maintained | |
233 | on CPAN, rather than in the perl core. | |
234 | ||
235 | See also L<Socket> | |
236 | ||
af7c9f88 RS |
237 | =item Lvalue subroutines |
238 | ||
239 | Introduced in Perl 5.6.0 | |
240 | ||
241 | Accepted in Perl 5.20.0 | |
242 | ||
243 | See also L<perlsub> | |
244 | ||
b387afbc RS |
245 | =item Backtracking control verbs |
246 | ||
247 | C<(*ACCEPT)> | |
248 | ||
249 | Introduced in: Perl 5.10 | |
250 | ||
251 | Accepted in Perl 5.20.0 | |
252 | ||
8a7bc862 RS |
253 | =item The <:pop> IO pseudolayer |
254 | ||
255 | See also L<perlrun> | |
256 | ||
257 | Accepted in Perl 5.20.0 | |
258 | ||
779cf272 KW |
259 | =item C<\s> in regexp matches vertical tab |
260 | ||
261 | Accepted in Perl 5.22.0 | |
262 | ||
2ad792cd AC |
263 | =item Postfix dereference syntax |
264 | ||
265 | Introduced in Perl 5.20.0 | |
266 | ||
267 | Accepted in Perl 5.24.0 | |
268 | ||
42e73e1c | 269 | =back |
270 | ||
271 | =head2 Removed features | |
272 | ||
273 | These features are no longer considered experimental and their functionality | |
274 | has disappeared. It's your own fault if you wrote production programs using | |
275 | these features after we explicitly told you not to (see L<perlpolicy>). | |
276 | ||
277 | =over 8 | |
278 | ||
51c34fa4 | 279 | =item 5.005-style threading |
42e73e1c | 280 | |
51c34fa4 | 281 | Introduced in Perl 5.005 |
42e73e1c | 282 | |
51c34fa4 | 283 | Removed in Perl 5.10 |
42e73e1c | 284 | |
51c34fa4 | 285 | =item perlcc |
fe8d2675 | 286 | |
51c34fa4 | 287 | Introduced in Perl 5.005 |
fe8d2675 | 288 | |
51c34fa4 | 289 | Moved from Perl 5.9.0 to CPAN |
fe8d2675 | 290 | |
51c34fa4 | 291 | =item The pseudo-hash data type |
fe8d2675 | 292 | |
51c34fa4 | 293 | Introduced in Perl 5.6.0 |
fe8d2675 | 294 | |
51c34fa4 | 295 | Removed in Perl 5.9.0 |
fe8d2675 AT |
296 | |
297 | =item GetOpt::Long Options can now take multiple values at once (experimental) | |
298 | ||
299 | C<Getopt::Long> upgraded to version 2.35 | |
300 | ||
301 | Removed in Perl 5.8.8 | |
302 | ||
51c34fa4 | 303 | =item Assertions |
fe8d2675 | 304 | |
51c34fa4 | 305 | The C<-A> command line switch |
fe8d2675 | 306 | |
51c34fa4 | 307 | Introduced in Perl 5.9.0 |
fe8d2675 | 308 | |
51c34fa4 | 309 | Removed in Perl 5.9.5 |
fe8d2675 | 310 | |
51c34fa4 | 311 | =item Test::Harness::Straps |
fe8d2675 | 312 | |
51c34fa4 | 313 | Moved from Perl 5.10.1 to CPAN |
fe8d2675 | 314 | |
51c34fa4 | 315 | =item C<legacy> |
fe8d2675 | 316 | |
51c34fa4 | 317 | The experimental C<legacy> pragma was swallowed by the C<feature> pragma. |
fe8d2675 | 318 | |
51c34fa4 RS |
319 | Introduced in: 5.11.2 |
320 | ||
321 | Removed in: 5.11.3 | |
fe8d2675 | 322 | |
42e73e1c | 323 | =back |
324 | ||
2b0121e1 AS |
325 | =head1 SEE ALSO |
326 | ||
327 | For a complete list of features check L<feature>. | |
328 | ||
42e73e1c | 329 | =head1 AUTHORS |
330 | ||
331 | brian d foy C<< <brian.d.foy@gmail.com> >> | |
332 | ||
fe8d2675 AT |
333 | SE<eacute>bastien Aperghis-Tramoni C<< <saper@cpan.org> >> |
334 | ||
42e73e1c | 335 | =head1 COPYRIGHT |
336 | ||
337 | Copyright 2010, brian d foy C<< <brian.d.foy@gmail.com> >> | |
338 | ||
339 | =head1 LICENSE | |
340 | ||
341 | You can use and redistribute this document under the same terms as Perl | |
342 | itself. | |
343 | ||
344 | =cut |