Commit | Line | Data |
94b19069 |
1 | |
2 | package Class::MOP; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
5a2932cf |
7 | use 5.008; |
8 | |
3cf322a0 |
9 | use MRO::Compat; |
10 | |
4c105333 |
11 | use Carp 'confess'; |
12 | use Scalar::Util 'weaken'; |
8b978dd5 |
13 | |
0531f510 |
14 | use Sub::Identify 'get_code_info'; |
15 | |
fc4f8f91 |
16 | BEGIN { |
17 | local $@; |
18 | eval { |
19 | require Sub::Name; |
20 | Sub::Name->import(qw(subname)); |
21 | 1 |
22 | } or eval 'sub subname { $_[1] }'; |
23 | |
24 | # this is either part of core or set up appropriately by MRO::Compat |
25 | *check_package_cache_flag = \&mro::get_pkg_gen; |
712ecd18 |
26 | |
27 | eval { |
28 | require Devel::GlobalDestruction; |
29 | Devel::GlobalDestruction->import("in_global_destruction"); |
30 | 1; |
31 | } or *in_global_destruction = sub () { '' }; |
fc4f8f91 |
32 | } |
33 | |
34 | |
0531f510 |
35 | use Class::MOP::Class; |
36 | use Class::MOP::Attribute; |
37 | use Class::MOP::Method; |
38 | |
39 | use Class::MOP::Immutable; |
40 | |
b1f5f41d |
41 | BEGIN { |
11b56828 |
42 | *IS_RUNNING_ON_5_10 = ($] < 5.009_005) |
43 | ? sub () { 0 } |
4c105333 |
44 | : sub () { 1 }; |
46b23b44 |
45 | |
9efe16ca |
46 | *HAVE_ISAREV = defined(&mro::get_isarev) |
47 | ? sub () { 1 } |
48 | : sub () { 1 }; |
b1f5f41d |
49 | } |
e0e4674a |
50 | |
d519662a |
51 | our $VERSION = '0.64_01'; |
52 | $VERSION = eval $VERSION; |
fc4f8f91 |
53 | our $AUTHORITY = 'cpan:STEVAN'; |
54 | |
0531f510 |
55 | # after that everything is loaded, if we're allowed try to load faster XS |
56 | # versions of various things |
57 | unless ($ENV{CLASS_MOP_NO_XS}) { |
58 | my $e = do { |
59 | local $@; |
60 | eval { |
61 | require XSLoader; |
fc4f8f91 |
62 | __PACKAGE__->XSLoader::load($VERSION); |
0531f510 |
63 | }; |
64 | $@; |
65 | }; |
15273f3c |
66 | |
0531f510 |
67 | die $e if $e && $e !~ /object version|loadable object/; |
68 | } |
15273f3c |
69 | |
be7677c7 |
70 | { |
71 | # Metaclasses are singletons, so we cache them here. |
72 | # there is no need to worry about destruction though |
73 | # because they should die only when the program dies. |
74 | # After all, do package definitions even get reaped? |
1d68af04 |
75 | my %METAS; |
76 | |
77 | # means of accessing all the metaclasses that have |
be7677c7 |
78 | # been initialized thus far (for mugwumps obj browser) |
1d68af04 |
79 | sub get_all_metaclasses { %METAS } |
80 | sub get_all_metaclass_instances { values %METAS } |
81 | sub get_all_metaclass_names { keys %METAS } |
be7677c7 |
82 | sub get_metaclass_by_name { $METAS{$_[0]} } |
1d68af04 |
83 | sub store_metaclass_by_name { $METAS{$_[0]} = $_[1] } |
84 | sub weaken_metaclass { weaken($METAS{$_[0]}) } |
be7677c7 |
85 | sub does_metaclass_exist { exists $METAS{$_[0]} && defined $METAS{$_[0]} } |
1d68af04 |
86 | sub remove_metaclass_by_name { $METAS{$_[0]} = undef } |
87 | |
be7677c7 |
88 | # NOTE: |
1d68af04 |
89 | # We only cache metaclasses, meaning instances of |
90 | # Class::MOP::Class. We do not cache instance of |
be7677c7 |
91 | # Class::MOP::Package or Class::MOP::Module. Mostly |
1d68af04 |
92 | # because I don't yet see a good reason to do so. |
be7677c7 |
93 | } |
94 | |
448b6e55 |
95 | sub load_class { |
96 | my $class = shift; |
ab5e2f48 |
97 | |
98 | if (ref($class) || !defined($class) || !length($class)) { |
99 | my $display = defined($class) ? $class : 'undef'; |
100 | confess "Invalid class name ($display)"; |
101 | } |
102 | |
07940968 |
103 | # if the class is not already loaded in the symbol table.. |
104 | unless (is_class_loaded($class)) { |
105 | # require it |
106 | my $file = $class . '.pm'; |
107 | $file =~ s{::}{/}g; |
1b8d9282 |
108 | my $e = do { local $@; eval { require($file) }; $@ }; |
109 | confess "Could not load class ($class) because : $e" if $e; |
07940968 |
110 | } |
111 | |
112 | # initialize a metaclass if necessary |
448b6e55 |
113 | unless (does_metaclass_exist($class)) { |
1b8d9282 |
114 | my $e = do { local $@; eval { Class::MOP::Class->initialize($class) }; $@ }; |
115 | confess "Could not initialize class ($class) because : $e" if $e; |
448b6e55 |
116 | } |
07940968 |
117 | |
1b8d9282 |
118 | return get_metaclass_by_name($class) if defined wantarray; |
448b6e55 |
119 | } |
120 | |
121 | sub is_class_loaded { |
c1d5345a |
122 | my $class = shift; |
26fcef27 |
123 | |
124 | return 0 if ref($class) || !defined($class) || !length($class); |
125 | |
126 | # walk the symbol table tree to avoid autovififying |
127 | # \*{${main::}{"Foo::"}} == \*main::Foo:: |
128 | |
129 | my $pack = \*::; |
130 | foreach my $part (split('::', $class)) { |
131 | return 0 unless exists ${$$pack}{"${part}::"}; |
132 | $pack = \*{${$$pack}{"${part}::"}}; |
c1d5345a |
133 | } |
26fcef27 |
134 | |
135 | # check for $VERSION or @ISA |
136 | return 1 if exists ${$$pack}{VERSION} |
137 | && defined *{${$$pack}{VERSION}}{SCALAR}; |
138 | return 1 if exists ${$$pack}{ISA} |
139 | && defined *{${$$pack}{ISA}}{ARRAY}; |
140 | |
141 | # check for any method |
142 | foreach ( keys %{$$pack} ) { |
143 | next if substr($_, -2, 2) eq '::'; |
d5be3722 |
144 | |
145 | my $glob = ${$$pack}{$_} || next; |
146 | |
9e275e86 |
147 | # constant subs |
d5be3722 |
148 | if ( IS_RUNNING_ON_5_10 ) { |
149 | return 1 if ref $glob eq 'SCALAR'; |
150 | } |
151 | |
152 | return 1 if defined *{$glob}{CODE}; |
26fcef27 |
153 | } |
154 | |
155 | # fail |
c1d5345a |
156 | return 0; |
448b6e55 |
157 | } |
158 | |
159 | |
aa448b16 |
160 | ## ---------------------------------------------------------------------------- |
161 | ## Setting up our environment ... |
162 | ## ---------------------------------------------------------------------------- |
1d68af04 |
163 | ## Class::MOP needs to have a few things in the global perl environment so |
aa448b16 |
164 | ## that it can operate effectively. Those things are done here. |
165 | ## ---------------------------------------------------------------------------- |
166 | |
3bf7644b |
167 | # ... nothing yet actually ;) |
8b978dd5 |
168 | |
b51af7f9 |
169 | ## ---------------------------------------------------------------------------- |
1d68af04 |
170 | ## Bootstrapping |
b51af7f9 |
171 | ## ---------------------------------------------------------------------------- |
1d68af04 |
172 | ## The code below here is to bootstrap our MOP with itself. This is also |
b51af7f9 |
173 | ## sometimes called "tying the knot". By doing this, we make it much easier |
174 | ## to extend the MOP through subclassing and such since now you can use the |
1d68af04 |
175 | ## MOP itself to extend itself. |
176 | ## |
b51af7f9 |
177 | ## Yes, I know, thats weird and insane, but it's a good thing, trust me :) |
1d68af04 |
178 | ## ---------------------------------------------------------------------------- |
727919c5 |
179 | |
1d68af04 |
180 | # We need to add in the meta-attributes here so that |
181 | # any subclass of Class::MOP::* will be able to |
727919c5 |
182 | # inherit them using &construct_instance |
183 | |
f0480c45 |
184 | ## -------------------------------------------------------- |
6d5355c3 |
185 | ## Class::MOP::Package |
727919c5 |
186 | |
6d5355c3 |
187 | Class::MOP::Package->meta->add_attribute( |
8683db0e |
188 | Class::MOP::Attribute->new('package' => ( |
b880e0de |
189 | reader => { |
1d68af04 |
190 | # NOTE: we need to do this in order |
191 | # for the instance meta-object to |
b880e0de |
192 | # not fall into meta-circular death |
1d68af04 |
193 | # |
ce2ae40f |
194 | # we just alias the original method |
1d68af04 |
195 | # rather than re-produce it here |
ce2ae40f |
196 | 'name' => \&Class::MOP::Package::name |
b880e0de |
197 | }, |
727919c5 |
198 | )) |
199 | ); |
200 | |
a5e51f0b |
201 | Class::MOP::Package->meta->add_attribute( |
8683db0e |
202 | Class::MOP::Attribute->new('namespace' => ( |
a5e51f0b |
203 | reader => { |
56dcfc1a |
204 | # NOTE: |
ce2ae40f |
205 | # we just alias the original method |
206 | # rather than re-produce it here |
207 | 'namespace' => \&Class::MOP::Package::namespace |
a5e51f0b |
208 | }, |
2e877f58 |
209 | init_arg => undef, |
c4260b45 |
210 | default => sub { \undef } |
a5e51f0b |
211 | )) |
212 | ); |
213 | |
f0480c45 |
214 | ## -------------------------------------------------------- |
215 | ## Class::MOP::Module |
216 | |
217 | # NOTE: |
1d68af04 |
218 | # yeah this is kind of stretching things a bit, |
f0480c45 |
219 | # but truthfully the version should be an attribute |
1d68af04 |
220 | # of the Module, the weirdness comes from having to |
221 | # stick to Perl 5 convention and store it in the |
222 | # $VERSION package variable. Basically if you just |
223 | # squint at it, it will look how you want it to look. |
f0480c45 |
224 | # Either as a package variable, or as a attribute of |
225 | # the metaclass, isn't abstraction great :) |
226 | |
227 | Class::MOP::Module->meta->add_attribute( |
8683db0e |
228 | Class::MOP::Attribute->new('version' => ( |
f0480c45 |
229 | reader => { |
ce2ae40f |
230 | # NOTE: |
231 | # we just alias the original method |
1d68af04 |
232 | # rather than re-produce it here |
ce2ae40f |
233 | 'version' => \&Class::MOP::Module::version |
f0480c45 |
234 | }, |
2e877f58 |
235 | init_arg => undef, |
c4260b45 |
236 | default => sub { \undef } |
f0480c45 |
237 | )) |
238 | ); |
239 | |
240 | # NOTE: |
1d68af04 |
241 | # By following the same conventions as version here, |
242 | # we are opening up the possibility that people can |
243 | # use the $AUTHORITY in non-Class::MOP modules as |
244 | # well. |
f0480c45 |
245 | |
246 | Class::MOP::Module->meta->add_attribute( |
8683db0e |
247 | Class::MOP::Attribute->new('authority' => ( |
f0480c45 |
248 | reader => { |
ce2ae40f |
249 | # NOTE: |
250 | # we just alias the original method |
1d68af04 |
251 | # rather than re-produce it here |
ce2ae40f |
252 | 'authority' => \&Class::MOP::Module::authority |
1d68af04 |
253 | }, |
2e877f58 |
254 | init_arg => undef, |
c4260b45 |
255 | default => sub { \undef } |
f0480c45 |
256 | )) |
257 | ); |
258 | |
259 | ## -------------------------------------------------------- |
6d5355c3 |
260 | ## Class::MOP::Class |
261 | |
727919c5 |
262 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
263 | Class::MOP::Attribute->new('attributes' => ( |
f7259199 |
264 | reader => { |
1d68af04 |
265 | # NOTE: we need to do this in order |
266 | # for the instance meta-object to |
267 | # not fall into meta-circular death |
268 | # |
ce2ae40f |
269 | # we just alias the original method |
1d68af04 |
270 | # rather than re-produce it here |
ce2ae40f |
271 | 'get_attribute_map' => \&Class::MOP::Class::get_attribute_map |
f7259199 |
272 | }, |
727919c5 |
273 | default => sub { {} } |
274 | )) |
275 | ); |
276 | |
351bd7d4 |
277 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
278 | Class::MOP::Attribute->new('methods' => ( |
1d68af04 |
279 | reader => { |
ce2ae40f |
280 | # NOTE: |
281 | # we just alias the original method |
1d68af04 |
282 | # rather than re-produce it here |
ce2ae40f |
283 | 'get_method_map' => \&Class::MOP::Class::get_method_map |
92330ee2 |
284 | }, |
7855ddba |
285 | default => sub { {} } |
c4260b45 |
286 | )) |
287 | ); |
288 | |
289 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
290 | Class::MOP::Attribute->new('superclasses' => ( |
c23184fc |
291 | accessor => { |
292 | # NOTE: |
293 | # we just alias the original method |
1d68af04 |
294 | # rather than re-produce it here |
c23184fc |
295 | 'superclasses' => \&Class::MOP::Class::superclasses |
296 | }, |
2e877f58 |
297 | init_arg => undef, |
c23184fc |
298 | default => sub { \undef } |
299 | )) |
300 | ); |
301 | |
302 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
303 | Class::MOP::Attribute->new('attribute_metaclass' => ( |
1d68af04 |
304 | reader => { |
6d2118a4 |
305 | # NOTE: |
306 | # we just alias the original method |
1d68af04 |
307 | # rather than re-produce it here |
6d2118a4 |
308 | 'attribute_metaclass' => \&Class::MOP::Class::attribute_metaclass |
1d68af04 |
309 | }, |
351bd7d4 |
310 | default => 'Class::MOP::Attribute', |
311 | )) |
312 | ); |
313 | |
314 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
315 | Class::MOP::Attribute->new('method_metaclass' => ( |
1d68af04 |
316 | reader => { |
6d2118a4 |
317 | # NOTE: |
318 | # we just alias the original method |
1d68af04 |
319 | # rather than re-produce it here |
6d2118a4 |
320 | 'method_metaclass' => \&Class::MOP::Class::method_metaclass |
321 | }, |
1d68af04 |
322 | default => 'Class::MOP::Method', |
351bd7d4 |
323 | )) |
324 | ); |
325 | |
2bab2be6 |
326 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
327 | Class::MOP::Attribute->new('instance_metaclass' => ( |
b880e0de |
328 | reader => { |
1d68af04 |
329 | # NOTE: we need to do this in order |
330 | # for the instance meta-object to |
331 | # not fall into meta-circular death |
332 | # |
ce2ae40f |
333 | # we just alias the original method |
1d68af04 |
334 | # rather than re-produce it here |
ce2ae40f |
335 | 'instance_metaclass' => \&Class::MOP::Class::instance_metaclass |
b880e0de |
336 | }, |
1d68af04 |
337 | default => 'Class::MOP::Instance', |
2bab2be6 |
338 | )) |
339 | ); |
340 | |
9d6dce77 |
341 | # NOTE: |
1d68af04 |
342 | # we don't actually need to tie the knot with |
343 | # Class::MOP::Class here, it is actually handled |
344 | # within Class::MOP::Class itself in the |
345 | # construct_class_instance method. |
9d6dce77 |
346 | |
f0480c45 |
347 | ## -------------------------------------------------------- |
727919c5 |
348 | ## Class::MOP::Attribute |
349 | |
7b31baf4 |
350 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
351 | Class::MOP::Attribute->new('name' => ( |
c23184fc |
352 | reader => { |
1d68af04 |
353 | # NOTE: we need to do this in order |
354 | # for the instance meta-object to |
355 | # not fall into meta-circular death |
356 | # |
ce2ae40f |
357 | # we just alias the original method |
1d68af04 |
358 | # rather than re-produce it here |
ce2ae40f |
359 | 'name' => \&Class::MOP::Attribute::name |
b880e0de |
360 | } |
7b31baf4 |
361 | )) |
362 | ); |
363 | |
364 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
365 | Class::MOP::Attribute->new('associated_class' => ( |
c23184fc |
366 | reader => { |
1d68af04 |
367 | # NOTE: we need to do this in order |
368 | # for the instance meta-object to |
369 | # not fall into meta-circular death |
370 | # |
ce2ae40f |
371 | # we just alias the original method |
1d68af04 |
372 | # rather than re-produce it here |
ce2ae40f |
373 | 'associated_class' => \&Class::MOP::Attribute::associated_class |
b880e0de |
374 | } |
7b31baf4 |
375 | )) |
376 | ); |
377 | |
378 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
379 | Class::MOP::Attribute->new('accessor' => ( |
6d2118a4 |
380 | reader => { 'accessor' => \&Class::MOP::Attribute::accessor }, |
381 | predicate => { 'has_accessor' => \&Class::MOP::Attribute::has_accessor }, |
7b31baf4 |
382 | )) |
383 | ); |
384 | |
385 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
386 | Class::MOP::Attribute->new('reader' => ( |
6d2118a4 |
387 | reader => { 'reader' => \&Class::MOP::Attribute::reader }, |
388 | predicate => { 'has_reader' => \&Class::MOP::Attribute::has_reader }, |
7b31baf4 |
389 | )) |
390 | ); |
391 | |
392 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
393 | Class::MOP::Attribute->new('initializer' => ( |
8ee74136 |
394 | reader => { 'initializer' => \&Class::MOP::Attribute::initializer }, |
395 | predicate => { 'has_initializer' => \&Class::MOP::Attribute::has_initializer }, |
0ab65f99 |
396 | )) |
397 | ); |
398 | |
399 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
400 | Class::MOP::Attribute->new('writer' => ( |
6d2118a4 |
401 | reader => { 'writer' => \&Class::MOP::Attribute::writer }, |
402 | predicate => { 'has_writer' => \&Class::MOP::Attribute::has_writer }, |
7b31baf4 |
403 | )) |
404 | ); |
405 | |
406 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
407 | Class::MOP::Attribute->new('predicate' => ( |
6d2118a4 |
408 | reader => { 'predicate' => \&Class::MOP::Attribute::predicate }, |
409 | predicate => { 'has_predicate' => \&Class::MOP::Attribute::has_predicate }, |
7b31baf4 |
410 | )) |
411 | ); |
412 | |
413 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
414 | Class::MOP::Attribute->new('clearer' => ( |
6d2118a4 |
415 | reader => { 'clearer' => \&Class::MOP::Attribute::clearer }, |
416 | predicate => { 'has_clearer' => \&Class::MOP::Attribute::has_clearer }, |
7d28758b |
417 | )) |
418 | ); |
419 | |
420 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
421 | Class::MOP::Attribute->new('builder' => ( |
1d68af04 |
422 | reader => { 'builder' => \&Class::MOP::Attribute::builder }, |
423 | predicate => { 'has_builder' => \&Class::MOP::Attribute::has_builder }, |
424 | )) |
425 | ); |
426 | |
427 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
428 | Class::MOP::Attribute->new('init_arg' => ( |
6d2118a4 |
429 | reader => { 'init_arg' => \&Class::MOP::Attribute::init_arg }, |
430 | predicate => { 'has_init_arg' => \&Class::MOP::Attribute::has_init_arg }, |
7b31baf4 |
431 | )) |
432 | ); |
433 | |
434 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
435 | Class::MOP::Attribute->new('default' => ( |
7b31baf4 |
436 | # default has a custom 'reader' method ... |
1d68af04 |
437 | predicate => { 'has_default' => \&Class::MOP::Attribute::has_default }, |
7b31baf4 |
438 | )) |
439 | ); |
440 | |
3545c727 |
441 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
442 | Class::MOP::Attribute->new('associated_methods' => ( |
c23184fc |
443 | reader => { 'associated_methods' => \&Class::MOP::Attribute::associated_methods }, |
1d68af04 |
444 | default => sub { [] } |
3545c727 |
445 | )) |
446 | ); |
727919c5 |
447 | |
5659d76e |
448 | Class::MOP::Attribute->meta->add_method('clone' => sub { |
a740253a |
449 | my $self = shift; |
1d68af04 |
450 | $self->meta->clone_object($self, @_); |
727919c5 |
451 | }); |
452 | |
f0480c45 |
453 | ## -------------------------------------------------------- |
b6164407 |
454 | ## Class::MOP::Method |
b6164407 |
455 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
456 | Class::MOP::Attribute->new('body' => ( |
c23184fc |
457 | reader => { 'body' => \&Class::MOP::Method::body }, |
b6164407 |
458 | )) |
459 | ); |
460 | |
4c105333 |
461 | Class::MOP::Method->meta->add_attribute( |
5e607260 |
462 | Class::MOP::Attribute->new('associated_metaclass' => ( |
5e607260 |
463 | reader => { 'associated_metaclass' => \&Class::MOP::Method::associated_metaclass }, |
464 | )) |
465 | ); |
466 | |
467 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
468 | Class::MOP::Attribute->new('package_name' => ( |
4c105333 |
469 | reader => { 'package_name' => \&Class::MOP::Method::package_name }, |
470 | )) |
471 | ); |
472 | |
473 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
474 | Class::MOP::Attribute->new('name' => ( |
4c105333 |
475 | reader => { 'name' => \&Class::MOP::Method::name }, |
476 | )) |
477 | ); |
478 | |
4c105333 |
479 | Class::MOP::Method->meta->add_method('clone' => sub { |
480 | my $self = shift; |
481 | $self->meta->clone_object($self, @_); |
482 | }); |
483 | |
b6164407 |
484 | ## -------------------------------------------------------- |
485 | ## Class::MOP::Method::Wrapped |
486 | |
487 | # NOTE: |
1d68af04 |
488 | # the way this item is initialized, this |
489 | # really does not follow the standard |
490 | # practices of attributes, but we put |
b6164407 |
491 | # it here for completeness |
492 | Class::MOP::Method::Wrapped->meta->add_attribute( |
8683db0e |
493 | Class::MOP::Attribute->new('modifier_table') |
b6164407 |
494 | ); |
495 | |
496 | ## -------------------------------------------------------- |
565f0cbb |
497 | ## Class::MOP::Method::Generated |
498 | |
499 | Class::MOP::Method::Generated->meta->add_attribute( |
8683db0e |
500 | Class::MOP::Attribute->new('is_inline' => ( |
565f0cbb |
501 | reader => { 'is_inline' => \&Class::MOP::Method::Generated::is_inline }, |
4c105333 |
502 | default => 0, |
1d68af04 |
503 | )) |
565f0cbb |
504 | ); |
505 | |
506 | ## -------------------------------------------------------- |
d90b42a6 |
507 | ## Class::MOP::Method::Accessor |
508 | |
509 | Class::MOP::Method::Accessor->meta->add_attribute( |
8683db0e |
510 | Class::MOP::Attribute->new('attribute' => ( |
1d68af04 |
511 | reader => { |
512 | 'associated_attribute' => \&Class::MOP::Method::Accessor::associated_attribute |
d90b42a6 |
513 | }, |
1d68af04 |
514 | )) |
d90b42a6 |
515 | ); |
516 | |
517 | Class::MOP::Method::Accessor->meta->add_attribute( |
8683db0e |
518 | Class::MOP::Attribute->new('accessor_type' => ( |
c23184fc |
519 | reader => { 'accessor_type' => \&Class::MOP::Method::Accessor::accessor_type }, |
1d68af04 |
520 | )) |
d90b42a6 |
521 | ); |
522 | |
d90b42a6 |
523 | ## -------------------------------------------------------- |
524 | ## Class::MOP::Method::Constructor |
525 | |
526 | Class::MOP::Method::Constructor->meta->add_attribute( |
8683db0e |
527 | Class::MOP::Attribute->new('options' => ( |
1d68af04 |
528 | reader => { |
529 | 'options' => \&Class::MOP::Method::Constructor::options |
d90b42a6 |
530 | }, |
4c105333 |
531 | default => sub { +{} } |
1d68af04 |
532 | )) |
d90b42a6 |
533 | ); |
534 | |
535 | Class::MOP::Method::Constructor->meta->add_attribute( |
8683db0e |
536 | Class::MOP::Attribute->new('associated_metaclass' => ( |
e8a38403 |
537 | init_arg => "metaclass", # FIXME alias and rename |
1d68af04 |
538 | reader => { |
539 | 'associated_metaclass' => \&Class::MOP::Method::Constructor::associated_metaclass |
540 | }, |
541 | )) |
d90b42a6 |
542 | ); |
543 | |
544 | ## -------------------------------------------------------- |
86482605 |
545 | ## Class::MOP::Instance |
546 | |
547 | # NOTE: |
1d68af04 |
548 | # these don't yet do much of anything, but are just |
86482605 |
549 | # included for completeness |
550 | |
551 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
552 | Class::MOP::Attribute->new('associated_metaclass', |
553 | reader => { associated_metaclass => \&Class::MOP::Instance::associated_metaclass }, |
554 | ), |
86482605 |
555 | ); |
556 | |
557 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
558 | Class::MOP::Attribute->new('_class_name', |
559 | init_arg => undef, |
560 | reader => { _class_name => \&Class::MOP::Instance::_class_name }, |
561 | #lazy => 1, # not yet supported by Class::MOP but out our version does it anyway |
562 | #default => sub { $_[0]->associated_metaclass->name }, |
563 | ), |
564 | ); |
565 | |
566 | Class::MOP::Instance->meta->add_attribute( |
567 | Class::MOP::Attribute->new('attributes', |
0b5d46da |
568 | reader => { attributes => \&Class::MOP::Instance::get_all_attributes }, |
74890687 |
569 | ), |
32bfc810 |
570 | ); |
571 | |
572 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
573 | Class::MOP::Attribute->new('slots', |
574 | reader => { slots => \&Class::MOP::Instance::slots }, |
575 | ), |
86482605 |
576 | ); |
577 | |
63d08a9e |
578 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
579 | Class::MOP::Attribute->new('slot_hash', |
580 | reader => { slot_hash => \&Class::MOP::Instance::slot_hash }, |
581 | ), |
63d08a9e |
582 | ); |
583 | |
584 | |
caa051fa |
585 | # we need the meta instance of the meta instance to be created now, in order |
586 | # for the constructor to be able to use it |
587 | Class::MOP::Instance->meta->get_meta_instance; |
588 | |
caa051fa |
589 | # pretend the add_method never happenned. it hasn't yet affected anything |
590 | undef Class::MOP::Instance->meta->{_package_cache_flag}; |
591 | |
86482605 |
592 | ## -------------------------------------------------------- |
f0480c45 |
593 | ## Now close all the Class::MOP::* classes |
4d47b77f |
594 | |
0b9372a2 |
595 | # NOTE: |
1d68af04 |
596 | # we don't need to inline the |
597 | # constructors or the accessors |
598 | # this only lengthens the compile |
599 | # time of the MOP, and gives us |
0b9372a2 |
600 | # no actual benefits. |
601 | |
602 | $_->meta->make_immutable( |
6c2f6b5c |
603 | inline_constructor => 1, |
604 | replace_constructor => 1, |
605 | constructor_name => "_new", |
45582002 |
606 | inline_accessors => 0, |
0b9372a2 |
607 | ) for qw/ |
1d68af04 |
608 | Class::MOP::Package |
609 | Class::MOP::Module |
610 | Class::MOP::Class |
611 | |
0b9372a2 |
612 | Class::MOP::Attribute |
1d68af04 |
613 | Class::MOP::Method |
614 | Class::MOP::Instance |
615 | |
616 | Class::MOP::Object |
0b9372a2 |
617 | |
565f0cbb |
618 | Class::MOP::Method::Generated |
1d68af04 |
619 | |
ba38bf08 |
620 | Class::MOP::Method::Accessor |
1d68af04 |
621 | Class::MOP::Method::Constructor |
622 | Class::MOP::Method::Wrapped |
0b9372a2 |
623 | /; |
b6164407 |
624 | |
94b19069 |
625 | 1; |
626 | |
627 | __END__ |
628 | |
629 | =pod |
630 | |
1d68af04 |
631 | =head1 NAME |
94b19069 |
632 | |
633 | Class::MOP - A Meta Object Protocol for Perl 5 |
634 | |
94b19069 |
635 | =head1 DESCRIPTON |
636 | |
127d39a7 |
637 | This module is a fully functioning meta object protocol for the |
1d68af04 |
638 | Perl 5 object system. It makes no attempt to change the behavior or |
639 | characteristics of the Perl 5 object system, only to create a |
27e31eaf |
640 | protocol for its manipulation and introspection. |
94b19069 |
641 | |
1d68af04 |
642 | That said, it does attempt to create the tools for building a rich |
643 | set of extensions to the Perl 5 object system. Every attempt has been |
644 | made for these tools to keep to the spirit of the Perl 5 object |
94b19069 |
645 | system that we all know and love. |
646 | |
1d68af04 |
647 | This documentation is admittedly sparse on details, as time permits |
648 | I will try to improve them. For now, I suggest looking at the items |
649 | listed in the L<SEE ALSO> section for more information. In particular |
650 | the book "The Art of the Meta Object Protocol" was very influential |
40483095 |
651 | in the development of this system. |
652 | |
bfe4d0fc |
653 | =head2 What is a Meta Object Protocol? |
654 | |
1d68af04 |
655 | A meta object protocol is an API to an object system. |
bfe4d0fc |
656 | |
1d68af04 |
657 | To be more specific, it is a set of abstractions of the components of |
658 | an object system (typically things like; classes, object, methods, |
659 | object attributes, etc.). These abstractions can then be used to both |
bfe4d0fc |
660 | inspect and manipulate the object system which they describe. |
661 | |
1d68af04 |
662 | It can be said that there are two MOPs for any object system; the |
663 | implicit MOP, and the explicit MOP. The implicit MOP handles things |
664 | like method dispatch or inheritance, which happen automatically as |
665 | part of how the object system works. The explicit MOP typically |
666 | handles the introspection/reflection features of the object system. |
667 | All object systems have implicit MOPs, without one, they would not |
668 | work. Explict MOPs however as less common, and depending on the |
669 | language can vary from restrictive (Reflection in Java or C#) to |
670 | wide open (CLOS is a perfect example). |
bfe4d0fc |
671 | |
e16da3e6 |
672 | =head2 Yet Another Class Builder!! Why? |
673 | |
1d68af04 |
674 | This is B<not> a class builder so much as it is a I<class builder |
675 | B<builder>>. My intent is that an end user does not use this module |
676 | directly, but instead this module is used by module authors to |
677 | build extensions and features onto the Perl 5 object system. |
e16da3e6 |
678 | |
94b19069 |
679 | =head2 Who is this module for? |
680 | |
1d68af04 |
681 | This module is specifically for anyone who has ever created or |
682 | wanted to create a module for the Class:: namespace. The tools which |
683 | this module will provide will hopefully make it easier to do more |
684 | complex things with Perl 5 classes by removing such barriers as |
685 | the need to hack the symbol tables, or understand the fine details |
686 | of method dispatch. |
94b19069 |
687 | |
bfe4d0fc |
688 | =head2 What changes do I have to make to use this module? |
689 | |
1d68af04 |
690 | This module was designed to be as unintrusive as possible. Many of |
691 | its features are accessible without B<any> change to your existsing |
692 | code at all. It is meant to be a compliment to your existing code and |
693 | not an intrusion on your code base. Unlike many other B<Class::> |
694 | modules, this module B<does not> require you subclass it, or even that |
695 | you C<use> it in within your module's package. |
bfe4d0fc |
696 | |
1d68af04 |
697 | The only features which requires additions to your code are the |
2eb717d5 |
698 | attribute handling and instance construction features, and these are |
1d68af04 |
699 | both completely optional features. The only reason for this is because |
700 | Perl 5's object system does not actually have these features built |
2eb717d5 |
701 | in. More information about this feature can be found below. |
bfe4d0fc |
702 | |
703 | =head2 A Note about Performance? |
704 | |
1d68af04 |
705 | It is a common misconception that explict MOPs are performance drains. |
706 | But this is not a universal truth at all, it is an side-effect of |
707 | specific implementations. For instance, using Java reflection is much |
708 | slower because the JVM cannot take advantage of any compiler |
709 | optimizations, and the JVM has to deal with much more runtime type |
710 | information as well. Reflection in C# is marginally better as it was |
711 | designed into the language and runtime (the CLR). In contrast, CLOS |
712 | (the Common Lisp Object System) was built to support an explicit MOP, |
713 | and so performance is tuned for it. |
714 | |
715 | This library in particular does it's absolute best to avoid putting |
716 | B<any> drain at all upon your code's performance. In fact, by itself |
717 | it does nothing to affect your existing code. So you only pay for |
2eb717d5 |
718 | what you actually use. |
bfe4d0fc |
719 | |
550d56db |
720 | =head2 About Metaclass compatibility |
721 | |
1d68af04 |
722 | This module makes sure that all metaclasses created are both upwards |
723 | and downwards compatible. The topic of metaclass compatibility is |
724 | highly esoteric and is something only encountered when doing deep and |
725 | involved metaclass hacking. There are two basic kinds of metaclass |
726 | incompatibility; upwards and downwards. |
550d56db |
727 | |
1d68af04 |
728 | Upwards metaclass compatibility means that the metaclass of a |
729 | given class is either the same as (or a subclass of) all of the |
550d56db |
730 | class's ancestors. |
731 | |
1d68af04 |
732 | Downward metaclass compatibility means that the metaclasses of a |
733 | given class's anscestors are all either the same as (or a subclass |
550d56db |
734 | of) that metaclass. |
735 | |
1d68af04 |
736 | Here is a diagram showing a set of two classes (C<A> and C<B>) and |
737 | two metaclasses (C<Meta::A> and C<Meta::B>) which have correct |
550d56db |
738 | metaclass compatibility both upwards and downwards. |
739 | |
740 | +---------+ +---------+ |
741 | | Meta::A |<----| Meta::B | <....... (instance of ) |
1d68af04 |
742 | +---------+ +---------+ <------- (inherits from) |
550d56db |
743 | ^ ^ |
744 | : : |
745 | +---------+ +---------+ |
746 | | A |<----| B | |
747 | +---------+ +---------+ |
748 | |
1d68af04 |
749 | As I said this is a highly esoteric topic and one you will only run |
750 | into if you do a lot of subclassing of B<Class::MOP::Class>. If you |
751 | are interested in why this is an issue see the paper |
752 | I<Uniform and safe metaclass composition> linked to in the |
550d56db |
753 | L<SEE ALSO> section of this document. |
754 | |
aa448b16 |
755 | =head2 Using custom metaclasses |
756 | |
1d68af04 |
757 | Always use the metaclass pragma when using a custom metaclass, this |
758 | will ensure the proper initialization order and not accidentely |
759 | create an incorrect type of metaclass for you. This is a very rare |
760 | problem, and one which can only occur if you are doing deep metaclass |
aa448b16 |
761 | programming. So in other words, don't worry about it. |
762 | |
94b19069 |
763 | =head1 PROTOCOLS |
764 | |
127d39a7 |
765 | The protocol is divided into 4 main sub-protocols: |
94b19069 |
766 | |
767 | =over 4 |
768 | |
769 | =item The Class protocol |
770 | |
1d68af04 |
771 | This provides a means of manipulating and introspecting a Perl 5 |
772 | class. It handles all of symbol table hacking for you, and provides |
94b19069 |
773 | a rich set of methods that go beyond simple package introspection. |
774 | |
552e3d24 |
775 | See L<Class::MOP::Class> for more details. |
776 | |
94b19069 |
777 | =item The Attribute protocol |
778 | |
1d68af04 |
779 | This provides a consistent represenation for an attribute of a |
780 | Perl 5 class. Since there are so many ways to create and handle |
127d39a7 |
781 | attributes in Perl 5 OO, this attempts to provide as much of a |
1d68af04 |
782 | unified approach as possible, while giving the freedom and |
94b19069 |
783 | flexibility to subclass for specialization. |
784 | |
552e3d24 |
785 | See L<Class::MOP::Attribute> for more details. |
786 | |
94b19069 |
787 | =item The Method protocol |
788 | |
1d68af04 |
789 | This provides a means of manipulating and introspecting methods in |
790 | the Perl 5 object system. As with attributes, there are many ways to |
791 | approach this topic, so we try to keep it pretty basic, while still |
94b19069 |
792 | making it possible to extend the system in many ways. |
793 | |
552e3d24 |
794 | See L<Class::MOP::Method> for more details. |
94b19069 |
795 | |
127d39a7 |
796 | =item The Instance protocol |
797 | |
798 | This provides a layer of abstraction for creating object instances. |
799 | Since the other layers use this protocol, it is relatively easy to |
800 | change the type of your instances from the default HASH ref to other |
801 | types of references. Several examples are provided in the F<examples/> |
802 | directory included in this distribution. |
803 | |
804 | See L<Class::MOP::Instance> for more details. |
805 | |
94b19069 |
806 | =back |
807 | |
be7677c7 |
808 | =head1 FUNCTIONS |
809 | |
c1d5345a |
810 | =head2 Constants |
811 | |
812 | =over 4 |
813 | |
814 | =item I<IS_RUNNING_ON_5_10> |
815 | |
816 | We set this constant depending on what version perl we are on, this |
817 | allows us to take advantage of new 5.10 features and stay backwards |
818 | compat. |
819 | |
9efe16ca |
820 | =item I<HAVE_ISAREV> |
821 | |
822 | Whether or not C<mro> provides C<get_isarev>, a much faster way to get all the |
823 | subclasses of a certain class. |
824 | |
c1d5345a |
825 | =back |
826 | |
448b6e55 |
827 | =head2 Utility functions |
828 | |
829 | =over 4 |
830 | |
831 | =item B<load_class ($class_name)> |
832 | |
1d68af04 |
833 | This will load a given C<$class_name> and if it does not have an |
448b6e55 |
834 | already initialized metaclass, then it will intialize one for it. |
127d39a7 |
835 | This function can be used in place of tricks like |
836 | C<eval "use $module"> or using C<require>. |
448b6e55 |
837 | |
838 | =item B<is_class_loaded ($class_name)> |
839 | |
1d68af04 |
840 | This will return a boolean depending on if the C<$class_name> has |
841 | been loaded. |
448b6e55 |
842 | |
1d68af04 |
843 | NOTE: This does a basic check of the symbol table to try and |
448b6e55 |
844 | determine as best it can if the C<$class_name> is loaded, it |
1d68af04 |
845 | is probably correct about 99% of the time. |
448b6e55 |
846 | |
b1f5f41d |
847 | =item B<check_package_cache_flag ($pkg)> |
e0e4674a |
848 | |
127d39a7 |
849 | This will return an integer that is managed by C<Class::MOP::Class> |
850 | to determine if a module's symbol table has been altered. |
851 | |
852 | In Perl 5.10 or greater, this flag is package specific. However in |
853 | versions prior to 5.10, this will use the C<PL_sub_generation> variable |
854 | which is not package specific. |
855 | |
e0e4674a |
856 | =item B<get_code_info ($code)> |
857 | |
127d39a7 |
858 | This function returns two values, the name of the package the C<$code> |
859 | is from and the name of the C<$code> itself. This is used by several |
860 | elements of the MOP to detemine where a given C<$code> reference is from. |
861 | |
4c105333 |
862 | =item B<subname ($name, $code)> |
863 | |
864 | B<NOTE: DO NOT USE THIS FUNCTION, IT IS FOR INTERNAL USE ONLY!> |
865 | |
866 | If possible, we will load the L<Sub::Name> module and this will function |
867 | as C<Sub::Name::subname> does, otherwise it will just return the C<$code> |
868 | argument. |
869 | |
6f49cf3f |
870 | =item B<in_global_destruction> |
871 | |
872 | If L<Devel::GlobalDestruction> is available, this returns true under global |
873 | destruction. |
874 | |
875 | Otherwise it's a constant returning false. |
876 | |
448b6e55 |
877 | =back |
878 | |
879 | =head2 Metaclass cache functions |
880 | |
1d68af04 |
881 | Class::MOP holds a cache of metaclasses, the following are functions |
882 | (B<not methods>) which can be used to access that cache. It is not |
883 | recommended that you mess with this, bad things could happen. But if |
be7677c7 |
884 | you are brave and willing to risk it, go for it. |
885 | |
886 | =over 4 |
887 | |
888 | =item B<get_all_metaclasses> |
889 | |
1d68af04 |
890 | This will return an hash of all the metaclass instances that have |
891 | been cached by B<Class::MOP::Class> keyed by the package name. |
b9d9fc0b |
892 | |
be7677c7 |
893 | =item B<get_all_metaclass_instances> |
894 | |
1d68af04 |
895 | This will return an array of all the metaclass instances that have |
b9d9fc0b |
896 | been cached by B<Class::MOP::Class>. |
897 | |
be7677c7 |
898 | =item B<get_all_metaclass_names> |
899 | |
1d68af04 |
900 | This will return an array of all the metaclass names that have |
b9d9fc0b |
901 | been cached by B<Class::MOP::Class>. |
902 | |
be7677c7 |
903 | =item B<get_metaclass_by_name ($name)> |
904 | |
127d39a7 |
905 | This will return a cached B<Class::MOP::Class> instance of nothing |
906 | if no metaclass exist by that C<$name>. |
907 | |
be7677c7 |
908 | =item B<store_metaclass_by_name ($name, $meta)> |
909 | |
127d39a7 |
910 | This will store a metaclass in the cache at the supplied C<$key>. |
911 | |
be7677c7 |
912 | =item B<weaken_metaclass ($name)> |
913 | |
127d39a7 |
914 | In rare cases it is desireable to store a weakened reference in |
915 | the metaclass cache. This function will weaken the reference to |
916 | the metaclass stored in C<$name>. |
917 | |
be7677c7 |
918 | =item B<does_metaclass_exist ($name)> |
919 | |
127d39a7 |
920 | This will return true of there exists a metaclass stored in the |
921 | C<$name> key and return false otherwise. |
922 | |
be7677c7 |
923 | =item B<remove_metaclass_by_name ($name)> |
924 | |
127d39a7 |
925 | This will remove a the metaclass stored in the C<$name> key. |
926 | |
be7677c7 |
927 | =back |
928 | |
552e3d24 |
929 | =head1 SEE ALSO |
8b978dd5 |
930 | |
552e3d24 |
931 | =head2 Books |
8b978dd5 |
932 | |
1d68af04 |
933 | There are very few books out on Meta Object Protocols and Metaclasses |
934 | because it is such an esoteric topic. The following books are really |
935 | the only ones I have found. If you know of any more, B<I<please>> |
a2e85e6c |
936 | email me and let me know, I would love to hear about them. |
937 | |
8b978dd5 |
938 | =over 4 |
939 | |
552e3d24 |
940 | =item "The Art of the Meta Object Protocol" |
8b978dd5 |
941 | |
552e3d24 |
942 | =item "Advances in Object-Oriented Metalevel Architecture and Reflection" |
8b978dd5 |
943 | |
b51af7f9 |
944 | =item "Putting MetaClasses to Work" |
945 | |
a2e85e6c |
946 | =item "Smalltalk: The Language" |
947 | |
94b19069 |
948 | =back |
949 | |
550d56db |
950 | =head2 Papers |
951 | |
952 | =over 4 |
953 | |
954 | =item Uniform and safe metaclass composition |
955 | |
1d68af04 |
956 | An excellent paper by the people who brought us the original Traits paper. |
957 | This paper is on how Traits can be used to do safe metaclass composition, |
958 | and offers an excellent introduction section which delves into the topic of |
550d56db |
959 | metaclass compatibility. |
960 | |
961 | L<http://www.iam.unibe.ch/~scg/Archive/Papers/Duca05ySafeMetaclassTrait.pdf> |
962 | |
963 | =item Safe Metaclass Programming |
964 | |
1d68af04 |
965 | This paper seems to precede the above paper, and propose a mix-in based |
966 | approach as opposed to the Traits based approach. Both papers have similar |
967 | information on the metaclass compatibility problem space. |
550d56db |
968 | |
969 | L<http://citeseer.ist.psu.edu/37617.html> |
970 | |
971 | =back |
972 | |
552e3d24 |
973 | =head2 Prior Art |
8b978dd5 |
974 | |
975 | =over 4 |
976 | |
7184ca14 |
977 | =item The Perl 6 MetaModel work in the Pugs project |
8b978dd5 |
978 | |
979 | =over 4 |
980 | |
552e3d24 |
981 | =item L<http://svn.openfoundry.org/pugs/perl5/Perl6-MetaModel> |
8b978dd5 |
982 | |
552e3d24 |
983 | =item L<http://svn.openfoundry.org/pugs/perl5/Perl6-ObjectSpace> |
8b978dd5 |
984 | |
985 | =back |
986 | |
94b19069 |
987 | =back |
988 | |
1d68af04 |
989 | =head2 Articles |
f8dfcfb7 |
990 | |
991 | =over 4 |
992 | |
1d68af04 |
993 | =item CPAN Module Review of Class::MOP |
f8dfcfb7 |
994 | |
995 | L<http://www.oreillynet.com/onlamp/blog/2006/06/cpan_module_review_classmop.html> |
996 | |
997 | =back |
998 | |
a2e85e6c |
999 | =head1 SIMILAR MODULES |
1000 | |
1d68af04 |
1001 | As I have said above, this module is a class-builder-builder, so it is |
1002 | not the same thing as modules like L<Class::Accessor> and |
1003 | L<Class::MethodMaker>. That being said there are very few modules on CPAN |
1004 | with similar goals to this module. The one I have found which is most |
1005 | like this module is L<Class::Meta>, although it's philosophy and the MOP it |
1006 | creates are very different from this modules. |
94b19069 |
1007 | |
a2e85e6c |
1008 | =head1 BUGS |
1009 | |
1d68af04 |
1010 | All complex software has bugs lurking in it, and this module is no |
a2e85e6c |
1011 | exception. If you find a bug please either email me, or add the bug |
1012 | to cpan-RT. |
1013 | |
1014 | =head1 ACKNOWLEDGEMENTS |
1015 | |
1016 | =over 4 |
1017 | |
b9d9fc0b |
1018 | =item Rob Kinyon |
a2e85e6c |
1019 | |
1d68af04 |
1020 | Thanks to Rob for actually getting the development of this module kick-started. |
a2e85e6c |
1021 | |
1022 | =back |
1023 | |
1a09d9cc |
1024 | =head1 AUTHORS |
94b19069 |
1025 | |
a2e85e6c |
1026 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
552e3d24 |
1027 | |
9c8cda90 |
1028 | B<with contributions from:> |
1029 | |
1030 | Brandon (blblack) Black |
1031 | |
1032 | Guillermo (groditi) Roditi |
1033 | |
9195ddff |
1034 | Matt (mst) Trout |
1035 | |
9c8cda90 |
1036 | Rob (robkinyon) Kinyon |
1037 | |
1038 | Yuval (nothingmuch) Kogman |
1a09d9cc |
1039 | |
f430cfa4 |
1040 | Scott (konobi) McWhirter |
1041 | |
94b19069 |
1042 | =head1 COPYRIGHT AND LICENSE |
1043 | |
69e3ab0a |
1044 | Copyright 2006-2008 by Infinity Interactive, Inc. |
94b19069 |
1045 | |
1046 | L<http://www.iinteractive.com> |
1047 | |
1048 | This library is free software; you can redistribute it and/or modify |
1d68af04 |
1049 | it under the same terms as Perl itself. |
94b19069 |
1050 | |
1051 | =cut |