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'; |
b1a46f91 |
12 | use Scalar::Util 'weaken', 'reftype', 'blessed'; |
fc4f8f91 |
13 | |
0531f510 |
14 | use Class::MOP::Class; |
15 | use Class::MOP::Attribute; |
16 | use Class::MOP::Method; |
17 | |
b1f5f41d |
18 | BEGIN { |
c7e28c19 |
19 | *IS_RUNNING_ON_5_10 = ($] < 5.009_005) |
11b56828 |
20 | ? sub () { 0 } |
c7e28c19 |
21 | : sub () { 1 }; |
46b23b44 |
22 | |
3ecd1b25 |
23 | # this is either part of core or set up appropriately by MRO::Compat |
24 | *check_package_cache_flag = \&mro::get_pkg_gen; |
b1f5f41d |
25 | } |
e0e4674a |
26 | |
19042e4d |
27 | our $VERSION = '0.92'; |
8a7085c1 |
28 | our $XS_VERSION = $VERSION; |
d519662a |
29 | $VERSION = eval $VERSION; |
c7e28c19 |
30 | our $AUTHORITY = 'cpan:STEVAN'; |
9d655b6d |
31 | |
4bfa5ddb |
32 | require XSLoader; |
33 | XSLoader::load( __PACKAGE__, $XS_VERSION ); |
d7bda114 |
34 | |
35 | |
be7677c7 |
36 | { |
37 | # Metaclasses are singletons, so we cache them here. |
38 | # there is no need to worry about destruction though |
39 | # because they should die only when the program dies. |
40 | # After all, do package definitions even get reaped? |
247d5b3c |
41 | # Anonymous classes manage their own destruction. |
1d68af04 |
42 | my %METAS; |
43 | |
1d68af04 |
44 | sub get_all_metaclasses { %METAS } |
45 | sub get_all_metaclass_instances { values %METAS } |
46 | sub get_all_metaclass_names { keys %METAS } |
be7677c7 |
47 | sub get_metaclass_by_name { $METAS{$_[0]} } |
1d68af04 |
48 | sub store_metaclass_by_name { $METAS{$_[0]} = $_[1] } |
49 | sub weaken_metaclass { weaken($METAS{$_[0]}) } |
be7677c7 |
50 | sub does_metaclass_exist { exists $METAS{$_[0]} && defined $METAS{$_[0]} } |
efc98200 |
51 | sub remove_metaclass_by_name { delete $METAS{$_[0]}; return } |
1d68af04 |
52 | |
86866fb5 |
53 | # This handles instances as well as class names |
54 | sub class_of { |
82999986 |
55 | return unless defined $_[0]; |
86866fb5 |
56 | my $class = blessed($_[0]) || $_[0]; |
57 | return $METAS{$class}; |
58 | } |
59 | |
be7677c7 |
60 | # NOTE: |
1d68af04 |
61 | # We only cache metaclasses, meaning instances of |
62 | # Class::MOP::Class. We do not cache instance of |
be7677c7 |
63 | # Class::MOP::Package or Class::MOP::Module. Mostly |
1d68af04 |
64 | # because I don't yet see a good reason to do so. |
be7677c7 |
65 | } |
66 | |
44da14be |
67 | sub _class_to_pmfile { |
68 | my $class = shift; |
69 | |
70 | my $file = $class . '.pm'; |
71 | $file =~ s{::}{/}g; |
72 | |
73 | return $file; |
74 | } |
75 | |
063ad0c5 |
76 | sub load_first_existing_class { |
f280f05c |
77 | my @classes = @_ |
78 | or return; |
5a24cf8a |
79 | |
80 | foreach my $class (@classes) { |
81 | unless ( _is_valid_class_name($class) ) { |
82 | my $display = defined($class) ? $class : 'undef'; |
83 | confess "Invalid class name ($display)"; |
84 | } |
ab5e2f48 |
85 | } |
86 | |
063ad0c5 |
87 | my $found; |
5a24cf8a |
88 | my %exceptions; |
063ad0c5 |
89 | for my $class (@classes) { |
90 | my $e = _try_load_one_class($class); |
91 | |
5a24cf8a |
92 | if ($e) { |
a3f2cdc0 |
93 | my $pmfile = _class_to_pmfile($class); |
063ad0c5 |
94 | $exceptions{$class} = $e; |
44da14be |
95 | last if $e !~ /^Can't locate \Q$pmfile\E in \@INC/; |
5a24cf8a |
96 | } |
97 | else { |
063ad0c5 |
98 | $found = $class; |
99 | last; |
5a24cf8a |
100 | } |
063ad0c5 |
101 | } |
5a24cf8a |
102 | |
1d8153bd |
103 | return $found if $found; |
07940968 |
104 | |
063ad0c5 |
105 | confess join( |
106 | "\n", |
107 | map { |
108 | sprintf( |
fea44045 |
109 | "Could not load class (%s) because : %s", $_, |
063ad0c5 |
110 | $exceptions{$_} |
111 | ) |
44da14be |
112 | } |
113 | grep { |
114 | exists $exceptions{$_} |
063ad0c5 |
115 | } @classes |
f280f05c |
116 | ); |
5a24cf8a |
117 | } |
118 | |
063ad0c5 |
119 | sub _try_load_one_class { |
120 | my $class = shift; |
121 | |
122 | return if is_class_loaded($class); |
2beec805 |
123 | |
44da14be |
124 | my $file = _class_to_pmfile($class); |
063ad0c5 |
125 | |
126 | return do { |
127 | local $@; |
b3813a8c |
128 | local $SIG{__DIE__}; |
063ad0c5 |
129 | eval { require($file) }; |
130 | $@; |
131 | }; |
132 | } |
133 | |
5a24cf8a |
134 | sub load_class { |
1d8153bd |
135 | my $class = load_first_existing_class($_[0]); |
136 | return get_metaclass_by_name($class) || $class; |
448b6e55 |
137 | } |
138 | |
2c0fb064 |
139 | sub _is_valid_class_name { |
140 | my $class = shift; |
141 | |
142 | return 0 if ref($class); |
143 | return 0 unless defined($class); |
144 | return 0 unless length($class); |
145 | |
146 | return 1 if $class =~ /^\w+(?:::\w+)*$/; |
147 | |
148 | return 0; |
149 | } |
150 | |
aa448b16 |
151 | ## ---------------------------------------------------------------------------- |
152 | ## Setting up our environment ... |
153 | ## ---------------------------------------------------------------------------- |
1d68af04 |
154 | ## Class::MOP needs to have a few things in the global perl environment so |
aa448b16 |
155 | ## that it can operate effectively. Those things are done here. |
156 | ## ---------------------------------------------------------------------------- |
157 | |
3bf7644b |
158 | # ... nothing yet actually ;) |
8b978dd5 |
159 | |
b51af7f9 |
160 | ## ---------------------------------------------------------------------------- |
1d68af04 |
161 | ## Bootstrapping |
b51af7f9 |
162 | ## ---------------------------------------------------------------------------- |
1d68af04 |
163 | ## The code below here is to bootstrap our MOP with itself. This is also |
b51af7f9 |
164 | ## sometimes called "tying the knot". By doing this, we make it much easier |
165 | ## to extend the MOP through subclassing and such since now you can use the |
1d68af04 |
166 | ## MOP itself to extend itself. |
167 | ## |
b51af7f9 |
168 | ## Yes, I know, thats weird and insane, but it's a good thing, trust me :) |
1d68af04 |
169 | ## ---------------------------------------------------------------------------- |
727919c5 |
170 | |
1d68af04 |
171 | # We need to add in the meta-attributes here so that |
172 | # any subclass of Class::MOP::* will be able to |
c2b256bc |
173 | # inherit them using _construct_instance |
727919c5 |
174 | |
f0480c45 |
175 | ## -------------------------------------------------------- |
6d5355c3 |
176 | ## Class::MOP::Package |
727919c5 |
177 | |
6d5355c3 |
178 | Class::MOP::Package->meta->add_attribute( |
8683db0e |
179 | Class::MOP::Attribute->new('package' => ( |
b880e0de |
180 | reader => { |
1d68af04 |
181 | # NOTE: we need to do this in order |
182 | # for the instance meta-object to |
b880e0de |
183 | # not fall into meta-circular death |
1d68af04 |
184 | # |
ce2ae40f |
185 | # we just alias the original method |
1d68af04 |
186 | # rather than re-produce it here |
ce2ae40f |
187 | 'name' => \&Class::MOP::Package::name |
b880e0de |
188 | }, |
727919c5 |
189 | )) |
190 | ); |
191 | |
a5e51f0b |
192 | Class::MOP::Package->meta->add_attribute( |
8683db0e |
193 | Class::MOP::Attribute->new('namespace' => ( |
a5e51f0b |
194 | reader => { |
56dcfc1a |
195 | # NOTE: |
ce2ae40f |
196 | # we just alias the original method |
197 | # rather than re-produce it here |
198 | 'namespace' => \&Class::MOP::Package::namespace |
a5e51f0b |
199 | }, |
2e877f58 |
200 | init_arg => undef, |
c4260b45 |
201 | default => sub { \undef } |
a5e51f0b |
202 | )) |
203 | ); |
204 | |
b1ff395f |
205 | Class::MOP::Package->meta->add_attribute( |
206 | Class::MOP::Attribute->new('methods' => ( |
207 | reader => { |
208 | # NOTE: |
209 | # we just alias the original method |
210 | # rather than re-produce it here |
211 | 'get_method_map' => \&Class::MOP::Package::get_method_map |
212 | }, |
213 | default => sub { {} } |
214 | )) |
215 | ); |
216 | |
217 | Class::MOP::Package->meta->add_attribute( |
218 | Class::MOP::Attribute->new('method_metaclass' => ( |
219 | reader => { |
220 | # NOTE: |
221 | # we just alias the original method |
222 | # rather than re-produce it here |
223 | 'method_metaclass' => \&Class::MOP::Package::method_metaclass |
224 | }, |
225 | default => 'Class::MOP::Method', |
226 | )) |
227 | ); |
228 | |
229 | Class::MOP::Package->meta->add_attribute( |
230 | Class::MOP::Attribute->new('wrapped_method_metaclass' => ( |
231 | reader => { |
232 | # NOTE: |
233 | # we just alias the original method |
234 | # rather than re-produce it here |
235 | 'wrapped_method_metaclass' => \&Class::MOP::Package::wrapped_method_metaclass |
236 | }, |
237 | default => 'Class::MOP::Method::Wrapped', |
238 | )) |
239 | ); |
240 | |
f0480c45 |
241 | ## -------------------------------------------------------- |
242 | ## Class::MOP::Module |
243 | |
244 | # NOTE: |
1d68af04 |
245 | # yeah this is kind of stretching things a bit, |
f0480c45 |
246 | # but truthfully the version should be an attribute |
1d68af04 |
247 | # of the Module, the weirdness comes from having to |
248 | # stick to Perl 5 convention and store it in the |
249 | # $VERSION package variable. Basically if you just |
250 | # squint at it, it will look how you want it to look. |
f0480c45 |
251 | # Either as a package variable, or as a attribute of |
252 | # the metaclass, isn't abstraction great :) |
253 | |
254 | Class::MOP::Module->meta->add_attribute( |
8683db0e |
255 | Class::MOP::Attribute->new('version' => ( |
f0480c45 |
256 | reader => { |
ce2ae40f |
257 | # NOTE: |
258 | # we just alias the original method |
1d68af04 |
259 | # rather than re-produce it here |
ce2ae40f |
260 | 'version' => \&Class::MOP::Module::version |
f0480c45 |
261 | }, |
2e877f58 |
262 | init_arg => undef, |
c4260b45 |
263 | default => sub { \undef } |
f0480c45 |
264 | )) |
265 | ); |
266 | |
267 | # NOTE: |
1d68af04 |
268 | # By following the same conventions as version here, |
269 | # we are opening up the possibility that people can |
270 | # use the $AUTHORITY in non-Class::MOP modules as |
271 | # well. |
f0480c45 |
272 | |
273 | Class::MOP::Module->meta->add_attribute( |
8683db0e |
274 | Class::MOP::Attribute->new('authority' => ( |
f0480c45 |
275 | reader => { |
ce2ae40f |
276 | # NOTE: |
277 | # we just alias the original method |
1d68af04 |
278 | # rather than re-produce it here |
ce2ae40f |
279 | 'authority' => \&Class::MOP::Module::authority |
1d68af04 |
280 | }, |
2e877f58 |
281 | init_arg => undef, |
c4260b45 |
282 | default => sub { \undef } |
f0480c45 |
283 | )) |
284 | ); |
285 | |
286 | ## -------------------------------------------------------- |
6d5355c3 |
287 | ## Class::MOP::Class |
288 | |
727919c5 |
289 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
290 | Class::MOP::Attribute->new('attributes' => ( |
f7259199 |
291 | reader => { |
1d68af04 |
292 | # NOTE: we need to do this in order |
293 | # for the instance meta-object to |
294 | # not fall into meta-circular death |
295 | # |
ce2ae40f |
296 | # we just alias the original method |
1d68af04 |
297 | # rather than re-produce it here |
ce2ae40f |
298 | 'get_attribute_map' => \&Class::MOP::Class::get_attribute_map |
f7259199 |
299 | }, |
727919c5 |
300 | default => sub { {} } |
301 | )) |
302 | ); |
303 | |
351bd7d4 |
304 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
305 | Class::MOP::Attribute->new('superclasses' => ( |
c23184fc |
306 | accessor => { |
307 | # NOTE: |
308 | # we just alias the original method |
1d68af04 |
309 | # rather than re-produce it here |
c23184fc |
310 | 'superclasses' => \&Class::MOP::Class::superclasses |
311 | }, |
2e877f58 |
312 | init_arg => undef, |
c23184fc |
313 | default => sub { \undef } |
314 | )) |
315 | ); |
316 | |
317 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
318 | Class::MOP::Attribute->new('attribute_metaclass' => ( |
1d68af04 |
319 | reader => { |
6d2118a4 |
320 | # NOTE: |
321 | # we just alias the original method |
1d68af04 |
322 | # rather than re-produce it here |
6d2118a4 |
323 | 'attribute_metaclass' => \&Class::MOP::Class::attribute_metaclass |
1d68af04 |
324 | }, |
351bd7d4 |
325 | default => 'Class::MOP::Attribute', |
326 | )) |
327 | ); |
328 | |
329 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
330 | Class::MOP::Attribute->new('instance_metaclass' => ( |
b880e0de |
331 | reader => { |
1d68af04 |
332 | # NOTE: we need to do this in order |
333 | # for the instance meta-object to |
334 | # not fall into meta-circular death |
335 | # |
ce2ae40f |
336 | # we just alias the original method |
1d68af04 |
337 | # rather than re-produce it here |
ce2ae40f |
338 | 'instance_metaclass' => \&Class::MOP::Class::instance_metaclass |
b880e0de |
339 | }, |
1d68af04 |
340 | default => 'Class::MOP::Instance', |
2bab2be6 |
341 | )) |
342 | ); |
343 | |
44d6ea77 |
344 | Class::MOP::Class->meta->add_attribute( |
f5d08022 |
345 | Class::MOP::Attribute->new('immutable_trait' => ( |
346 | reader => { |
347 | 'immutable_trait' => \&Class::MOP::Class::immutable_trait |
348 | }, |
349 | default => "Class::MOP::Class::Immutable::Trait", |
350 | )) |
351 | ); |
352 | |
353 | Class::MOP::Class->meta->add_attribute( |
354 | Class::MOP::Attribute->new('constructor_name' => ( |
44d6ea77 |
355 | reader => { |
f5d08022 |
356 | 'constructor_name' => \&Class::MOP::Class::constructor_name, |
44d6ea77 |
357 | }, |
f5d08022 |
358 | default => "new", |
359 | )) |
360 | ); |
361 | |
362 | Class::MOP::Class->meta->add_attribute( |
363 | Class::MOP::Attribute->new('constructor_class' => ( |
44d6ea77 |
364 | reader => { |
f5d08022 |
365 | 'constructor_class' => \&Class::MOP::Class::constructor_class, |
44d6ea77 |
366 | }, |
f5d08022 |
367 | default => "Class::MOP::Method::Constructor", |
368 | )) |
369 | ); |
370 | |
371 | |
372 | Class::MOP::Class->meta->add_attribute( |
373 | Class::MOP::Attribute->new('destructor_class' => ( |
374 | reader => { |
375 | 'destructor_class' => \&Class::MOP::Class::destructor_class, |
44d6ea77 |
376 | }, |
377 | )) |
378 | ); |
379 | |
9d6dce77 |
380 | # NOTE: |
1d68af04 |
381 | # we don't actually need to tie the knot with |
382 | # Class::MOP::Class here, it is actually handled |
383 | # within Class::MOP::Class itself in the |
c2b256bc |
384 | # _construct_class_instance method. |
9d6dce77 |
385 | |
f0480c45 |
386 | ## -------------------------------------------------------- |
727919c5 |
387 | ## Class::MOP::Attribute |
388 | |
7b31baf4 |
389 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
390 | Class::MOP::Attribute->new('name' => ( |
c23184fc |
391 | reader => { |
1d68af04 |
392 | # NOTE: we need to do this in order |
393 | # for the instance meta-object to |
394 | # not fall into meta-circular death |
395 | # |
ce2ae40f |
396 | # we just alias the original method |
1d68af04 |
397 | # rather than re-produce it here |
ce2ae40f |
398 | 'name' => \&Class::MOP::Attribute::name |
b880e0de |
399 | } |
7b31baf4 |
400 | )) |
401 | ); |
402 | |
403 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
404 | Class::MOP::Attribute->new('associated_class' => ( |
c23184fc |
405 | reader => { |
1d68af04 |
406 | # NOTE: we need to do this in order |
407 | # for the instance meta-object to |
408 | # not fall into meta-circular death |
409 | # |
ce2ae40f |
410 | # we just alias the original method |
1d68af04 |
411 | # rather than re-produce it here |
ce2ae40f |
412 | 'associated_class' => \&Class::MOP::Attribute::associated_class |
b880e0de |
413 | } |
7b31baf4 |
414 | )) |
415 | ); |
416 | |
417 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
418 | Class::MOP::Attribute->new('accessor' => ( |
6d2118a4 |
419 | reader => { 'accessor' => \&Class::MOP::Attribute::accessor }, |
420 | predicate => { 'has_accessor' => \&Class::MOP::Attribute::has_accessor }, |
7b31baf4 |
421 | )) |
422 | ); |
423 | |
424 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
425 | Class::MOP::Attribute->new('reader' => ( |
6d2118a4 |
426 | reader => { 'reader' => \&Class::MOP::Attribute::reader }, |
427 | predicate => { 'has_reader' => \&Class::MOP::Attribute::has_reader }, |
7b31baf4 |
428 | )) |
429 | ); |
430 | |
431 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
432 | Class::MOP::Attribute->new('initializer' => ( |
8ee74136 |
433 | reader => { 'initializer' => \&Class::MOP::Attribute::initializer }, |
434 | predicate => { 'has_initializer' => \&Class::MOP::Attribute::has_initializer }, |
0ab65f99 |
435 | )) |
436 | ); |
437 | |
438 | Class::MOP::Attribute->meta->add_attribute( |
d9d99689 |
439 | Class::MOP::Attribute->new('definition_context' => ( |
440 | reader => { 'definition_context' => \&Class::MOP::Attribute::definition_context }, |
441 | )) |
442 | ); |
443 | |
444 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
445 | Class::MOP::Attribute->new('writer' => ( |
6d2118a4 |
446 | reader => { 'writer' => \&Class::MOP::Attribute::writer }, |
447 | predicate => { 'has_writer' => \&Class::MOP::Attribute::has_writer }, |
7b31baf4 |
448 | )) |
449 | ); |
450 | |
451 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
452 | Class::MOP::Attribute->new('predicate' => ( |
6d2118a4 |
453 | reader => { 'predicate' => \&Class::MOP::Attribute::predicate }, |
454 | predicate => { 'has_predicate' => \&Class::MOP::Attribute::has_predicate }, |
7b31baf4 |
455 | )) |
456 | ); |
457 | |
458 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
459 | Class::MOP::Attribute->new('clearer' => ( |
6d2118a4 |
460 | reader => { 'clearer' => \&Class::MOP::Attribute::clearer }, |
461 | predicate => { 'has_clearer' => \&Class::MOP::Attribute::has_clearer }, |
7d28758b |
462 | )) |
463 | ); |
464 | |
465 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
466 | Class::MOP::Attribute->new('builder' => ( |
1d68af04 |
467 | reader => { 'builder' => \&Class::MOP::Attribute::builder }, |
468 | predicate => { 'has_builder' => \&Class::MOP::Attribute::has_builder }, |
469 | )) |
470 | ); |
471 | |
472 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
473 | Class::MOP::Attribute->new('init_arg' => ( |
6d2118a4 |
474 | reader => { 'init_arg' => \&Class::MOP::Attribute::init_arg }, |
475 | predicate => { 'has_init_arg' => \&Class::MOP::Attribute::has_init_arg }, |
7b31baf4 |
476 | )) |
477 | ); |
478 | |
479 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
480 | Class::MOP::Attribute->new('default' => ( |
7b31baf4 |
481 | # default has a custom 'reader' method ... |
1d68af04 |
482 | predicate => { 'has_default' => \&Class::MOP::Attribute::has_default }, |
7b31baf4 |
483 | )) |
484 | ); |
485 | |
3545c727 |
486 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
487 | Class::MOP::Attribute->new('associated_methods' => ( |
c23184fc |
488 | reader => { 'associated_methods' => \&Class::MOP::Attribute::associated_methods }, |
1d68af04 |
489 | default => sub { [] } |
3545c727 |
490 | )) |
491 | ); |
727919c5 |
492 | |
95b67145 |
493 | Class::MOP::Attribute->meta->add_attribute( |
494 | Class::MOP::Attribute->new('insertion_order' => ( |
495 | reader => { 'insertion_order' => \&Class::MOP::Attribute::insertion_order }, |
943cbe2d |
496 | writer => { '_set_insertion_order' => \&Class::MOP::Attribute::_set_insertion_order }, |
95b67145 |
497 | predicate => { 'has_insertion_order' => \&Class::MOP::Attribute::has_insertion_order }, |
498 | )) |
499 | ); |
500 | |
5659d76e |
501 | Class::MOP::Attribute->meta->add_method('clone' => sub { |
a740253a |
502 | my $self = shift; |
1d68af04 |
503 | $self->meta->clone_object($self, @_); |
727919c5 |
504 | }); |
505 | |
f0480c45 |
506 | ## -------------------------------------------------------- |
b6164407 |
507 | ## Class::MOP::Method |
b6164407 |
508 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
509 | Class::MOP::Attribute->new('body' => ( |
c23184fc |
510 | reader => { 'body' => \&Class::MOP::Method::body }, |
b6164407 |
511 | )) |
512 | ); |
513 | |
4c105333 |
514 | Class::MOP::Method->meta->add_attribute( |
5e607260 |
515 | Class::MOP::Attribute->new('associated_metaclass' => ( |
5e607260 |
516 | reader => { 'associated_metaclass' => \&Class::MOP::Method::associated_metaclass }, |
517 | )) |
518 | ); |
519 | |
520 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
521 | Class::MOP::Attribute->new('package_name' => ( |
4c105333 |
522 | reader => { 'package_name' => \&Class::MOP::Method::package_name }, |
523 | )) |
524 | ); |
525 | |
526 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
527 | Class::MOP::Attribute->new('name' => ( |
4c105333 |
528 | reader => { 'name' => \&Class::MOP::Method::name }, |
529 | )) |
530 | ); |
531 | |
2226a8b0 |
532 | Class::MOP::Method->meta->add_attribute( |
533 | Class::MOP::Attribute->new('original_method' => ( |
534 | reader => { 'original_method' => \&Class::MOP::Method::original_method }, |
535 | writer => { '_set_original_method' => \&Class::MOP::Method::_set_original_method }, |
536 | )) |
537 | ); |
538 | |
4c105333 |
539 | Class::MOP::Method->meta->add_method('clone' => sub { |
540 | my $self = shift; |
2226a8b0 |
541 | my $clone = $self->meta->clone_object($self, @_); |
542 | $clone->_set_original_method($self); |
543 | return $clone; |
4c105333 |
544 | }); |
545 | |
b6164407 |
546 | ## -------------------------------------------------------- |
547 | ## Class::MOP::Method::Wrapped |
548 | |
549 | # NOTE: |
1d68af04 |
550 | # the way this item is initialized, this |
551 | # really does not follow the standard |
552 | # practices of attributes, but we put |
b6164407 |
553 | # it here for completeness |
554 | Class::MOP::Method::Wrapped->meta->add_attribute( |
8683db0e |
555 | Class::MOP::Attribute->new('modifier_table') |
b6164407 |
556 | ); |
557 | |
558 | ## -------------------------------------------------------- |
565f0cbb |
559 | ## Class::MOP::Method::Generated |
560 | |
561 | Class::MOP::Method::Generated->meta->add_attribute( |
8683db0e |
562 | Class::MOP::Attribute->new('is_inline' => ( |
565f0cbb |
563 | reader => { 'is_inline' => \&Class::MOP::Method::Generated::is_inline }, |
4c105333 |
564 | default => 0, |
1d68af04 |
565 | )) |
565f0cbb |
566 | ); |
567 | |
d9d99689 |
568 | Class::MOP::Method::Generated->meta->add_attribute( |
569 | Class::MOP::Attribute->new('definition_context' => ( |
570 | reader => { 'definition_context' => \&Class::MOP::Method::Generated::definition_context }, |
571 | )) |
572 | ); |
573 | |
29d4e92a |
574 | |
575 | ## -------------------------------------------------------- |
576 | ## Class::MOP::Method::Inlined |
577 | |
578 | Class::MOP::Method::Inlined->meta->add_attribute( |
579 | Class::MOP::Attribute->new('_expected_method_class' => ( |
580 | reader => { '_expected_method_class' => \&Class::MOP::Method::Inlined::_expected_method_class }, |
581 | )) |
582 | ); |
583 | |
565f0cbb |
584 | ## -------------------------------------------------------- |
d90b42a6 |
585 | ## Class::MOP::Method::Accessor |
586 | |
587 | Class::MOP::Method::Accessor->meta->add_attribute( |
8683db0e |
588 | Class::MOP::Attribute->new('attribute' => ( |
1d68af04 |
589 | reader => { |
590 | 'associated_attribute' => \&Class::MOP::Method::Accessor::associated_attribute |
d90b42a6 |
591 | }, |
1d68af04 |
592 | )) |
d90b42a6 |
593 | ); |
594 | |
595 | Class::MOP::Method::Accessor->meta->add_attribute( |
8683db0e |
596 | Class::MOP::Attribute->new('accessor_type' => ( |
c23184fc |
597 | reader => { 'accessor_type' => \&Class::MOP::Method::Accessor::accessor_type }, |
1d68af04 |
598 | )) |
d90b42a6 |
599 | ); |
600 | |
d90b42a6 |
601 | ## -------------------------------------------------------- |
602 | ## Class::MOP::Method::Constructor |
603 | |
604 | Class::MOP::Method::Constructor->meta->add_attribute( |
8683db0e |
605 | Class::MOP::Attribute->new('options' => ( |
1d68af04 |
606 | reader => { |
607 | 'options' => \&Class::MOP::Method::Constructor::options |
d90b42a6 |
608 | }, |
4c105333 |
609 | default => sub { +{} } |
1d68af04 |
610 | )) |
d90b42a6 |
611 | ); |
612 | |
613 | Class::MOP::Method::Constructor->meta->add_attribute( |
8683db0e |
614 | Class::MOP::Attribute->new('associated_metaclass' => ( |
e8a38403 |
615 | init_arg => "metaclass", # FIXME alias and rename |
1d68af04 |
616 | reader => { |
617 | 'associated_metaclass' => \&Class::MOP::Method::Constructor::associated_metaclass |
618 | }, |
619 | )) |
d90b42a6 |
620 | ); |
621 | |
622 | ## -------------------------------------------------------- |
86482605 |
623 | ## Class::MOP::Instance |
624 | |
625 | # NOTE: |
1d68af04 |
626 | # these don't yet do much of anything, but are just |
86482605 |
627 | # included for completeness |
628 | |
629 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
630 | Class::MOP::Attribute->new('associated_metaclass', |
631 | reader => { associated_metaclass => \&Class::MOP::Instance::associated_metaclass }, |
632 | ), |
86482605 |
633 | ); |
634 | |
635 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
636 | Class::MOP::Attribute->new('_class_name', |
637 | init_arg => undef, |
638 | reader => { _class_name => \&Class::MOP::Instance::_class_name }, |
639 | #lazy => 1, # not yet supported by Class::MOP but out our version does it anyway |
640 | #default => sub { $_[0]->associated_metaclass->name }, |
641 | ), |
642 | ); |
643 | |
644 | Class::MOP::Instance->meta->add_attribute( |
645 | Class::MOP::Attribute->new('attributes', |
0b5d46da |
646 | reader => { attributes => \&Class::MOP::Instance::get_all_attributes }, |
74890687 |
647 | ), |
32bfc810 |
648 | ); |
649 | |
650 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
651 | Class::MOP::Attribute->new('slots', |
652 | reader => { slots => \&Class::MOP::Instance::slots }, |
653 | ), |
86482605 |
654 | ); |
655 | |
63d08a9e |
656 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
657 | Class::MOP::Attribute->new('slot_hash', |
658 | reader => { slot_hash => \&Class::MOP::Instance::slot_hash }, |
659 | ), |
63d08a9e |
660 | ); |
661 | |
30229767 |
662 | require Class::MOP::Deprecated unless our $no_deprecated; |
63d08a9e |
663 | |
caa051fa |
664 | # we need the meta instance of the meta instance to be created now, in order |
665 | # for the constructor to be able to use it |
666 | Class::MOP::Instance->meta->get_meta_instance; |
667 | |
caa051fa |
668 | # pretend the add_method never happenned. it hasn't yet affected anything |
669 | undef Class::MOP::Instance->meta->{_package_cache_flag}; |
670 | |
86482605 |
671 | ## -------------------------------------------------------- |
f0480c45 |
672 | ## Now close all the Class::MOP::* classes |
4d47b77f |
673 | |
1aa13cf4 |
674 | # NOTE: we don't need to inline the the accessors this only lengthens |
675 | # the compile time of the MOP, and gives us no actual benefits. |
0b9372a2 |
676 | |
677 | $_->meta->make_immutable( |
ec9e38e5 |
678 | inline_constructor => 0, |
6c2f6b5c |
679 | constructor_name => "_new", |
45582002 |
680 | inline_accessors => 0, |
0b9372a2 |
681 | ) for qw/ |
1d68af04 |
682 | Class::MOP::Package |
683 | Class::MOP::Module |
684 | Class::MOP::Class |
685 | |
0b9372a2 |
686 | Class::MOP::Attribute |
1d68af04 |
687 | Class::MOP::Method |
688 | Class::MOP::Instance |
689 | |
690 | Class::MOP::Object |
0b9372a2 |
691 | |
565f0cbb |
692 | Class::MOP::Method::Generated |
29d4e92a |
693 | Class::MOP::Method::Inlined |
1d68af04 |
694 | |
ba38bf08 |
695 | Class::MOP::Method::Accessor |
1d68af04 |
696 | Class::MOP::Method::Constructor |
697 | Class::MOP::Method::Wrapped |
0b9372a2 |
698 | /; |
b6164407 |
699 | |
94b19069 |
700 | 1; |
701 | |
702 | __END__ |
703 | |
704 | =pod |
705 | |
1d68af04 |
706 | =head1 NAME |
94b19069 |
707 | |
708 | Class::MOP - A Meta Object Protocol for Perl 5 |
709 | |
5b60bf98 |
710 | =head1 DESCRIPTION |
94b19069 |
711 | |
127d39a7 |
712 | This module is a fully functioning meta object protocol for the |
1d68af04 |
713 | Perl 5 object system. It makes no attempt to change the behavior or |
714 | characteristics of the Perl 5 object system, only to create a |
27e31eaf |
715 | protocol for its manipulation and introspection. |
94b19069 |
716 | |
828ecf13 |
717 | That said, it does attempt to create the tools for building a rich set |
718 | of extensions to the Perl 5 object system. Every attempt has been made |
719 | to abide by the spirit of the Perl 5 object system that we all know |
720 | and love. |
94b19069 |
721 | |
828ecf13 |
722 | This documentation is sparse on conceptual details. We suggest looking |
723 | at the items listed in the L<SEE ALSO> section for more |
724 | information. In particular the book "The Art of the Meta Object |
725 | Protocol" was very influential in the development of this system. |
40483095 |
726 | |
bfe4d0fc |
727 | =head2 What is a Meta Object Protocol? |
728 | |
1d68af04 |
729 | A meta object protocol is an API to an object system. |
bfe4d0fc |
730 | |
828ecf13 |
731 | To be more specific, it abstracts the components of an object system |
732 | (classes, object, methods, object attributes, etc.). These |
733 | abstractions can then be used to inspect and manipulate the object |
734 | system which they describe. |
bfe4d0fc |
735 | |
1d68af04 |
736 | It can be said that there are two MOPs for any object system; the |
828ecf13 |
737 | implicit MOP and the explicit MOP. The implicit MOP handles things |
1d68af04 |
738 | like method dispatch or inheritance, which happen automatically as |
739 | part of how the object system works. The explicit MOP typically |
740 | handles the introspection/reflection features of the object system. |
bfe4d0fc |
741 | |
828ecf13 |
742 | All object systems have implicit MOPs. Without one, they would not |
5b60bf98 |
743 | work. Explicit MOPs are much less common, and depending on the |
744 | language can vary from restrictive (Reflection in Java or C#) to wide |
745 | open (CLOS is a perfect example). |
e16da3e6 |
746 | |
828ecf13 |
747 | =head2 Yet Another Class Builder! Why? |
748 | |
749 | This is B<not> a class builder so much as a I<class builder |
750 | B<builder>>. The intent is that an end user will not use this module |
751 | directly, but instead this module is used by module authors to build |
752 | extensions and features onto the Perl 5 object system. |
753 | |
754 | This system is used by L<Moose>, which supplies a powerful class |
755 | builder system built entirely on top of C<Class::MOP>. |
e16da3e6 |
756 | |
94b19069 |
757 | =head2 Who is this module for? |
758 | |
828ecf13 |
759 | This module is for anyone who has ever created or wanted to create a |
760 | module for the Class:: namespace. The tools which this module provides |
761 | make doing complex Perl 5 wizardry simpler, by removing such barriers |
762 | as the need to hack symbol tables, or understand the fine details of |
763 | method dispatch. |
94b19069 |
764 | |
bfe4d0fc |
765 | =head2 What changes do I have to make to use this module? |
766 | |
828ecf13 |
767 | This module was designed to be as unintrusive as possible. Many of its |
5b60bf98 |
768 | features are accessible without B<any> change to your existing |
828ecf13 |
769 | code. It is meant to be a compliment to your existing code and not an |
770 | intrusion on your code base. Unlike many other B<Class::> modules, |
771 | this module B<does not> require you subclass it, or even that you |
772 | C<use> it in within your module's package. |
bfe4d0fc |
773 | |
1d68af04 |
774 | The only features which requires additions to your code are the |
2eb717d5 |
775 | attribute handling and instance construction features, and these are |
1d68af04 |
776 | both completely optional features. The only reason for this is because |
777 | Perl 5's object system does not actually have these features built |
2eb717d5 |
778 | in. More information about this feature can be found below. |
bfe4d0fc |
779 | |
828ecf13 |
780 | =head2 About Performance |
781 | |
5b60bf98 |
782 | It is a common misconception that explicit MOPs are a performance hit. |
828ecf13 |
783 | This is not a universal truth, it is a side-effect of some specific |
784 | implementations. For instance, using Java reflection is slow because |
785 | the JVM cannot take advantage of any compiler optimizations, and the |
786 | JVM has to deal with much more runtime type information as well. |
bfe4d0fc |
787 | |
828ecf13 |
788 | Reflection in C# is marginally better as it was designed into the |
789 | language and runtime (the CLR). In contrast, CLOS (the Common Lisp |
790 | Object System) was built to support an explicit MOP, and so |
791 | performance is tuned for it. |
1d68af04 |
792 | |
828ecf13 |
793 | This library in particular does its absolute best to avoid putting |
1d68af04 |
794 | B<any> drain at all upon your code's performance. In fact, by itself |
828ecf13 |
795 | it does nothing to affect your existing code. So you only pay for what |
796 | you actually use. |
bfe4d0fc |
797 | |
550d56db |
798 | =head2 About Metaclass compatibility |
799 | |
1d68af04 |
800 | This module makes sure that all metaclasses created are both upwards |
801 | and downwards compatible. The topic of metaclass compatibility is |
802 | highly esoteric and is something only encountered when doing deep and |
803 | involved metaclass hacking. There are two basic kinds of metaclass |
804 | incompatibility; upwards and downwards. |
550d56db |
805 | |
1d68af04 |
806 | Upwards metaclass compatibility means that the metaclass of a |
807 | given class is either the same as (or a subclass of) all of the |
550d56db |
808 | class's ancestors. |
809 | |
1d68af04 |
810 | Downward metaclass compatibility means that the metaclasses of a |
828ecf13 |
811 | given class's ancestors are all either the same as (or a subclass |
550d56db |
812 | of) that metaclass. |
813 | |
1d68af04 |
814 | Here is a diagram showing a set of two classes (C<A> and C<B>) and |
815 | two metaclasses (C<Meta::A> and C<Meta::B>) which have correct |
550d56db |
816 | metaclass compatibility both upwards and downwards. |
817 | |
818 | +---------+ +---------+ |
819 | | Meta::A |<----| Meta::B | <....... (instance of ) |
1d68af04 |
820 | +---------+ +---------+ <------- (inherits from) |
550d56db |
821 | ^ ^ |
822 | : : |
823 | +---------+ +---------+ |
824 | | A |<----| B | |
825 | +---------+ +---------+ |
826 | |
1d68af04 |
827 | As I said this is a highly esoteric topic and one you will only run |
828ecf13 |
828 | into if you do a lot of subclassing of L<Class::MOP::Class>. If you |
829 | are interested in why this is an issue see the paper I<Uniform and |
830 | safe metaclass composition> linked to in the L<SEE ALSO> section of |
831 | this document. |
550d56db |
832 | |
aa448b16 |
833 | =head2 Using custom metaclasses |
834 | |
828ecf13 |
835 | Always use the L<metaclass> pragma when using a custom metaclass, this |
5b60bf98 |
836 | will ensure the proper initialization order and not accidentally |
837 | create an incorrect type of metaclass for you. This is a very rare |
838 | problem, and one which can only occur if you are doing deep metaclass |
aa448b16 |
839 | programming. So in other words, don't worry about it. |
840 | |
828ecf13 |
841 | Note that if you're using L<Moose> we encourage you to I<not> use |
842 | L<metaclass> pragma, and instead use L<Moose::Util::MetaRole> to apply |
843 | roles to a class's metaclasses. This topic is covered at length in |
844 | various L<Moose::Cookbook> recipes. |
845 | |
94b19069 |
846 | =head1 PROTOCOLS |
847 | |
828ecf13 |
848 | The meta-object protocol is divided into 4 main sub-protocols: |
94b19069 |
849 | |
828ecf13 |
850 | =head2 The Class protocol |
94b19069 |
851 | |
1d68af04 |
852 | This provides a means of manipulating and introspecting a Perl 5 |
828ecf13 |
853 | class. It handles symbol table hacking for you, and provides a rich |
854 | set of methods that go beyond simple package introspection. |
94b19069 |
855 | |
552e3d24 |
856 | See L<Class::MOP::Class> for more details. |
857 | |
828ecf13 |
858 | =head2 The Attribute protocol |
94b19069 |
859 | |
828ecf13 |
860 | This provides a consistent representation for an attribute of a Perl 5 |
861 | class. Since there are so many ways to create and handle attributes in |
862 | Perl 5 OO, the Attribute protocol provide as much of a unified |
863 | approach as possible. Of course, you are always free to extend this |
864 | protocol by subclassing the appropriate classes. |
94b19069 |
865 | |
552e3d24 |
866 | See L<Class::MOP::Attribute> for more details. |
867 | |
828ecf13 |
868 | =head2 The Method protocol |
94b19069 |
869 | |
828ecf13 |
870 | This provides a means of manipulating and introspecting methods in the |
871 | Perl 5 object system. As with attributes, there are many ways to |
1d68af04 |
872 | approach this topic, so we try to keep it pretty basic, while still |
94b19069 |
873 | making it possible to extend the system in many ways. |
874 | |
552e3d24 |
875 | See L<Class::MOP::Method> for more details. |
94b19069 |
876 | |
828ecf13 |
877 | =head2 The Instance protocol |
127d39a7 |
878 | |
828ecf13 |
879 | This provides a layer of abstraction for creating object instances. |
880 | Since the other layers use this protocol, it is relatively easy to |
881 | change the type of your instances from the default hash reference to |
882 | some other type of reference. Several examples are provided in the |
883 | F<examples/> directory included in this distribution. |
127d39a7 |
884 | |
885 | See L<Class::MOP::Instance> for more details. |
886 | |
be7677c7 |
887 | =head1 FUNCTIONS |
888 | |
828ecf13 |
889 | Note that this module does not export any constants or functions. |
890 | |
c1d5345a |
891 | =head2 Constants |
892 | |
893 | =over 4 |
894 | |
828ecf13 |
895 | =item I<Class::MOP::IS_RUNNING_ON_5_10> |
c1d5345a |
896 | |
828ecf13 |
897 | We set this constant depending on what version perl we are on, this |
898 | allows us to take advantage of new 5.10 features and stay backwards |
5b60bf98 |
899 | compatible. |
c1d5345a |
900 | |
901 | =back |
902 | |
448b6e55 |
903 | =head2 Utility functions |
904 | |
bd07fbdb |
905 | Note that these are all called as B<functions, not methods>. |
081a927b |
906 | |
448b6e55 |
907 | =over 4 |
908 | |
828ecf13 |
909 | =item B<Class::MOP::load_class($class_name)> |
448b6e55 |
910 | |
9d441c23 |
911 | This will load the specified C<$class_name>, if it is not already |
912 | loaded (as reported by C<is_class_loaded>). This function can be used |
828ecf13 |
913 | in place of tricks like C<eval "use $module"> or using C<require> |
828de8f4 |
914 | unconditionally. This will return the metaclass of C<$class_name> if |
915 | one exists, otherwise it will return C<$class_name>. |
448b6e55 |
916 | |
828ecf13 |
917 | =item B<Class::MOP::is_class_loaded($class_name)> |
448b6e55 |
918 | |
15ab5451 |
919 | Returns a boolean indicating whether or not C<$class_name> has been |
920 | loaded. |
448b6e55 |
921 | |
828ecf13 |
922 | This does a basic check of the symbol table to try and determine as |
923 | best it can if the C<$class_name> is loaded, it is probably correct |
924 | about 99% of the time, but it can be fooled into reporting false |
9d441c23 |
925 | positives. In particular, loading any of the core L<IO> modules will |
926 | cause most of the rest of the core L<IO> modules to falsely report |
927 | having been loaded, due to the way the base L<IO> module works. |
448b6e55 |
928 | |
cdac22cc |
929 | =item B<Class::MOP::get_code_info($code)> |
930 | |
931 | This function returns two values, the name of the package the C<$code> |
932 | is from and the name of the C<$code> itself. This is used by several |
5b60bf98 |
933 | elements of the MOP to determine where a given C<$code> reference is |
cdac22cc |
934 | from. |
935 | |
44ba77a3 |
936 | =item B<Class::MOP::class_of($instance_or_class_name)> |
937 | |
3fa5b3f9 |
938 | This will return the metaclass of the given instance or class name. If the |
939 | class lacks a metaclass, no metaclass will be initialized, and C<undef> will be |
940 | returned. |
44ba77a3 |
941 | |
828ecf13 |
942 | =item B<Class::MOP::check_package_cache_flag($pkg)> |
e0e4674a |
943 | |
bd07fbdb |
944 | B<NOTE: DO NOT USE THIS FUNCTION, IT IS FOR INTERNAL USE ONLY!> |
945 | |
828ecf13 |
946 | This will return an integer that is managed by L<Class::MOP::Class> to |
947 | determine if a module's symbol table has been altered. |
127d39a7 |
948 | |
828ecf13 |
949 | In Perl 5.10 or greater, this flag is package specific. However in |
950 | versions prior to 5.10, this will use the C<PL_sub_generation> |
951 | variable which is not package specific. |
127d39a7 |
952 | |
828ecf13 |
953 | =item B<Class::MOP::load_first_existing_class(@class_names)> |
063ad0c5 |
954 | |
955 | B<NOTE: DO NOT USE THIS FUNCTION, IT IS FOR INTERNAL USE ONLY!> |
956 | |
957 | Given a list of class names, this function will attempt to load each |
958 | one in turn. |
959 | |
828ecf13 |
960 | If it finds a class it can load, it will return that class' name. If |
961 | none of the classes can be loaded, it will throw an exception. |
063ad0c5 |
962 | |
448b6e55 |
963 | =back |
964 | |
965 | =head2 Metaclass cache functions |
966 | |
6c842677 |
967 | Class::MOP holds a cache of metaclasses. The following are functions |
1d68af04 |
968 | (B<not methods>) which can be used to access that cache. It is not |
6c842677 |
969 | recommended that you mess with these. Bad things could happen, but if |
970 | you are brave and willing to risk it: go for it! |
be7677c7 |
971 | |
972 | =over 4 |
973 | |
828ecf13 |
974 | =item B<Class::MOP::get_all_metaclasses> |
be7677c7 |
975 | |
6c842677 |
976 | This will return a hash of all the metaclass instances that have |
828ecf13 |
977 | been cached by L<Class::MOP::Class>, keyed by the package name. |
b9d9fc0b |
978 | |
828ecf13 |
979 | =item B<Class::MOP::get_all_metaclass_instances> |
be7677c7 |
980 | |
6c842677 |
981 | This will return a list of all the metaclass instances that have |
828ecf13 |
982 | been cached by L<Class::MOP::Class>. |
b9d9fc0b |
983 | |
828ecf13 |
984 | =item B<Class::MOP::get_all_metaclass_names> |
be7677c7 |
985 | |
6c842677 |
986 | This will return a list of all the metaclass names that have |
828ecf13 |
987 | been cached by L<Class::MOP::Class>. |
b9d9fc0b |
988 | |
828ecf13 |
989 | =item B<Class::MOP::get_metaclass_by_name($name)> |
be7677c7 |
990 | |
828ecf13 |
991 | This will return a cached L<Class::MOP::Class> instance, or nothing |
6c842677 |
992 | if no metaclass exists with that C<$name>. |
127d39a7 |
993 | |
828ecf13 |
994 | =item B<Class::MOP::store_metaclass_by_name($name, $meta)> |
be7677c7 |
995 | |
127d39a7 |
996 | This will store a metaclass in the cache at the supplied C<$key>. |
997 | |
828ecf13 |
998 | =item B<Class::MOP::weaken_metaclass($name)> |
be7677c7 |
999 | |
6c842677 |
1000 | In rare cases (e.g. anonymous metaclasses) it is desirable to |
1001 | store a weakened reference in the metaclass cache. This |
1002 | function will weaken the reference to the metaclass stored |
1003 | in C<$name>. |
127d39a7 |
1004 | |
828ecf13 |
1005 | =item B<Class::MOP::does_metaclass_exist($name)> |
be7677c7 |
1006 | |
828ecf13 |
1007 | This will return true of there exists a metaclass stored in the |
6c842677 |
1008 | C<$name> key, and return false otherwise. |
127d39a7 |
1009 | |
828ecf13 |
1010 | =item B<Class::MOP::remove_metaclass_by_name($name)> |
be7677c7 |
1011 | |
6c842677 |
1012 | This will remove the metaclass stored in the C<$name> key. |
127d39a7 |
1013 | |
be7677c7 |
1014 | =back |
1015 | |
552e3d24 |
1016 | =head1 SEE ALSO |
8b978dd5 |
1017 | |
552e3d24 |
1018 | =head2 Books |
8b978dd5 |
1019 | |
1d68af04 |
1020 | There are very few books out on Meta Object Protocols and Metaclasses |
1021 | because it is such an esoteric topic. The following books are really |
1022 | the only ones I have found. If you know of any more, B<I<please>> |
a2e85e6c |
1023 | email me and let me know, I would love to hear about them. |
1024 | |
8b978dd5 |
1025 | =over 4 |
1026 | |
15ab5451 |
1027 | =item I<The Art of the Meta Object Protocol> |
8b978dd5 |
1028 | |
15ab5451 |
1029 | =item I<Advances in Object-Oriented Metalevel Architecture and Reflection> |
8b978dd5 |
1030 | |
15ab5451 |
1031 | =item I<Putting MetaClasses to Work> |
b51af7f9 |
1032 | |
15ab5451 |
1033 | =item I<Smalltalk: The Language> |
a2e85e6c |
1034 | |
94b19069 |
1035 | =back |
1036 | |
550d56db |
1037 | =head2 Papers |
1038 | |
1039 | =over 4 |
1040 | |
15ab5451 |
1041 | =item "Uniform and safe metaclass composition" |
550d56db |
1042 | |
1d68af04 |
1043 | An excellent paper by the people who brought us the original Traits paper. |
1044 | This paper is on how Traits can be used to do safe metaclass composition, |
1045 | and offers an excellent introduction section which delves into the topic of |
550d56db |
1046 | metaclass compatibility. |
1047 | |
1048 | L<http://www.iam.unibe.ch/~scg/Archive/Papers/Duca05ySafeMetaclassTrait.pdf> |
1049 | |
15ab5451 |
1050 | =item "Safe Metaclass Programming" |
550d56db |
1051 | |
1d68af04 |
1052 | This paper seems to precede the above paper, and propose a mix-in based |
1053 | approach as opposed to the Traits based approach. Both papers have similar |
1054 | information on the metaclass compatibility problem space. |
550d56db |
1055 | |
1056 | L<http://citeseer.ist.psu.edu/37617.html> |
1057 | |
1058 | =back |
1059 | |
552e3d24 |
1060 | =head2 Prior Art |
8b978dd5 |
1061 | |
1062 | =over 4 |
1063 | |
7184ca14 |
1064 | =item The Perl 6 MetaModel work in the Pugs project |
8b978dd5 |
1065 | |
1066 | =over 4 |
1067 | |
02615ef0 |
1068 | =item L<http://svn.openfoundry.org/pugs/misc/Perl-MetaModel/> |
8b978dd5 |
1069 | |
552e3d24 |
1070 | =item L<http://svn.openfoundry.org/pugs/perl5/Perl6-ObjectSpace> |
8b978dd5 |
1071 | |
1072 | =back |
1073 | |
94b19069 |
1074 | =back |
1075 | |
1d68af04 |
1076 | =head2 Articles |
f8dfcfb7 |
1077 | |
1078 | =over 4 |
1079 | |
1d68af04 |
1080 | =item CPAN Module Review of Class::MOP |
f8dfcfb7 |
1081 | |
1082 | L<http://www.oreillynet.com/onlamp/blog/2006/06/cpan_module_review_classmop.html> |
1083 | |
1084 | =back |
1085 | |
a2e85e6c |
1086 | =head1 SIMILAR MODULES |
1087 | |
1d68af04 |
1088 | As I have said above, this module is a class-builder-builder, so it is |
1089 | not the same thing as modules like L<Class::Accessor> and |
1090 | L<Class::MethodMaker>. That being said there are very few modules on CPAN |
1091 | with similar goals to this module. The one I have found which is most |
1092 | like this module is L<Class::Meta>, although it's philosophy and the MOP it |
1093 | creates are very different from this modules. |
94b19069 |
1094 | |
a2e85e6c |
1095 | =head1 BUGS |
1096 | |
1d68af04 |
1097 | All complex software has bugs lurking in it, and this module is no |
53702399 |
1098 | exception. |
1099 | |
1100 | Please report any bugs to C<bug-class-mop@rt.cpan.org>, or through the |
1101 | web interface at L<http://rt.cpan.org>. |
1102 | |
1103 | You can also discuss feature requests or possible bugs on the Moose |
1104 | mailing list (moose@perl.org) or on IRC at |
1105 | L<irc://irc.perl.org/#moose>. |
a2e85e6c |
1106 | |
1107 | =head1 ACKNOWLEDGEMENTS |
1108 | |
1109 | =over 4 |
1110 | |
b9d9fc0b |
1111 | =item Rob Kinyon |
a2e85e6c |
1112 | |
1d68af04 |
1113 | Thanks to Rob for actually getting the development of this module kick-started. |
a2e85e6c |
1114 | |
1115 | =back |
1116 | |
1a09d9cc |
1117 | =head1 AUTHORS |
94b19069 |
1118 | |
a2e85e6c |
1119 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
552e3d24 |
1120 | |
9c8cda90 |
1121 | B<with contributions from:> |
1122 | |
1123 | Brandon (blblack) Black |
1124 | |
4f116037 |
1125 | Florian (rafl) Ragwitz |
1126 | |
9c8cda90 |
1127 | Guillermo (groditi) Roditi |
1128 | |
53702399 |
1129 | Dave (autarch) Rolsky |
1130 | |
9195ddff |
1131 | Matt (mst) Trout |
1132 | |
9c8cda90 |
1133 | Rob (robkinyon) Kinyon |
1134 | |
1135 | Yuval (nothingmuch) Kogman |
1a09d9cc |
1136 | |
f430cfa4 |
1137 | Scott (konobi) McWhirter |
1138 | |
20f5ccef |
1139 | Dylan Hardison |
1140 | |
94b19069 |
1141 | =head1 COPYRIGHT AND LICENSE |
1142 | |
070bb6c9 |
1143 | Copyright 2006-2009 by Infinity Interactive, Inc. |
94b19069 |
1144 | |
1145 | L<http://www.iinteractive.com> |
1146 | |
1147 | This library is free software; you can redistribute it and/or modify |
1d68af04 |
1148 | it under the same terms as Perl itself. |
94b19069 |
1149 | |
1150 | =cut |