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'; |
4bfa5ddb |
12 | use Devel::GlobalDestruction qw( in_global_destruction ); |
b1a46f91 |
13 | use Scalar::Util 'weaken', 'reftype', 'blessed'; |
4bfa5ddb |
14 | use Sub::Name qw( subname ); |
fc4f8f91 |
15 | |
0531f510 |
16 | use Class::MOP::Class; |
17 | use Class::MOP::Attribute; |
18 | use Class::MOP::Method; |
19 | |
20 | use Class::MOP::Immutable; |
21 | |
b1f5f41d |
22 | BEGIN { |
11b56828 |
23 | *IS_RUNNING_ON_5_10 = ($] < 5.009_005) |
24 | ? sub () { 0 } |
4c105333 |
25 | : sub () { 1 }; |
46b23b44 |
26 | |
f9bd8fe2 |
27 | sub HAVE_ISAREV () { |
28 | warn "Class::MOP::HAVE_ISAREV is deprecated and will be removed in a future release. It has always returned 1 anyway."; |
29 | return 1; |
30 | } |
3ecd1b25 |
31 | |
32 | # this is either part of core or set up appropriately by MRO::Compat |
33 | *check_package_cache_flag = \&mro::get_pkg_gen; |
b1f5f41d |
34 | } |
e0e4674a |
35 | |
d7fe2508 |
36 | our $VERSION = '0.79'; |
8a7085c1 |
37 | our $XS_VERSION = $VERSION; |
d519662a |
38 | $VERSION = eval $VERSION; |
fc4f8f91 |
39 | our $AUTHORITY = 'cpan:STEVAN'; |
9d655b6d |
40 | |
4bfa5ddb |
41 | require XSLoader; |
42 | XSLoader::load( __PACKAGE__, $XS_VERSION ); |
d7bda114 |
43 | |
44 | |
be7677c7 |
45 | { |
46 | # Metaclasses are singletons, so we cache them here. |
47 | # there is no need to worry about destruction though |
48 | # because they should die only when the program dies. |
49 | # After all, do package definitions even get reaped? |
1d68af04 |
50 | my %METAS; |
51 | |
52 | # means of accessing all the metaclasses that have |
be7677c7 |
53 | # been initialized thus far (for mugwumps obj browser) |
1d68af04 |
54 | sub get_all_metaclasses { %METAS } |
55 | sub get_all_metaclass_instances { values %METAS } |
56 | sub get_all_metaclass_names { keys %METAS } |
be7677c7 |
57 | sub get_metaclass_by_name { $METAS{$_[0]} } |
1d68af04 |
58 | sub store_metaclass_by_name { $METAS{$_[0]} = $_[1] } |
59 | sub weaken_metaclass { weaken($METAS{$_[0]}) } |
be7677c7 |
60 | sub does_metaclass_exist { exists $METAS{$_[0]} && defined $METAS{$_[0]} } |
1d68af04 |
61 | sub remove_metaclass_by_name { $METAS{$_[0]} = undef } |
62 | |
86866fb5 |
63 | # This handles instances as well as class names |
64 | sub class_of { |
65 | my $class = blessed($_[0]) || $_[0]; |
66 | return $METAS{$class}; |
67 | } |
68 | |
be7677c7 |
69 | # NOTE: |
1d68af04 |
70 | # We only cache metaclasses, meaning instances of |
71 | # Class::MOP::Class. We do not cache instance of |
be7677c7 |
72 | # Class::MOP::Package or Class::MOP::Module. Mostly |
1d68af04 |
73 | # because I don't yet see a good reason to do so. |
be7677c7 |
74 | } |
75 | |
44da14be |
76 | sub _class_to_pmfile { |
77 | my $class = shift; |
78 | |
79 | my $file = $class . '.pm'; |
80 | $file =~ s{::}{/}g; |
81 | |
82 | return $file; |
83 | } |
84 | |
063ad0c5 |
85 | sub load_first_existing_class { |
f280f05c |
86 | my @classes = @_ |
87 | or return; |
5a24cf8a |
88 | |
89 | foreach my $class (@classes) { |
90 | unless ( _is_valid_class_name($class) ) { |
91 | my $display = defined($class) ? $class : 'undef'; |
92 | confess "Invalid class name ($display)"; |
93 | } |
ab5e2f48 |
94 | } |
95 | |
063ad0c5 |
96 | my $found; |
5a24cf8a |
97 | my %exceptions; |
063ad0c5 |
98 | for my $class (@classes) { |
44da14be |
99 | my $pmfile = _class_to_pmfile($class); |
063ad0c5 |
100 | my $e = _try_load_one_class($class); |
101 | |
5a24cf8a |
102 | if ($e) { |
063ad0c5 |
103 | $exceptions{$class} = $e; |
44da14be |
104 | last if $e !~ /^Can't locate \Q$pmfile\E in \@INC/; |
5a24cf8a |
105 | } |
106 | else { |
063ad0c5 |
107 | $found = $class; |
108 | last; |
5a24cf8a |
109 | } |
063ad0c5 |
110 | } |
5a24cf8a |
111 | |
1d8153bd |
112 | return $found if $found; |
07940968 |
113 | |
063ad0c5 |
114 | confess join( |
115 | "\n", |
116 | map { |
117 | sprintf( |
fea44045 |
118 | "Could not load class (%s) because : %s", $_, |
063ad0c5 |
119 | $exceptions{$_} |
120 | ) |
44da14be |
121 | } |
122 | grep { |
123 | exists $exceptions{$_} |
063ad0c5 |
124 | } @classes |
f280f05c |
125 | ); |
5a24cf8a |
126 | } |
127 | |
063ad0c5 |
128 | sub _try_load_one_class { |
129 | my $class = shift; |
130 | |
131 | return if is_class_loaded($class); |
2beec805 |
132 | |
44da14be |
133 | my $file = _class_to_pmfile($class); |
063ad0c5 |
134 | |
135 | return do { |
136 | local $@; |
137 | eval { require($file) }; |
138 | $@; |
139 | }; |
140 | } |
141 | |
5a24cf8a |
142 | sub load_class { |
1d8153bd |
143 | my $class = load_first_existing_class($_[0]); |
144 | return get_metaclass_by_name($class) || $class; |
448b6e55 |
145 | } |
146 | |
2c0fb064 |
147 | sub _is_valid_class_name { |
148 | my $class = shift; |
149 | |
150 | return 0 if ref($class); |
151 | return 0 unless defined($class); |
152 | return 0 unless length($class); |
153 | |
154 | return 1 if $class =~ /^\w+(?:::\w+)*$/; |
155 | |
156 | return 0; |
157 | } |
158 | |
aa448b16 |
159 | ## ---------------------------------------------------------------------------- |
160 | ## Setting up our environment ... |
161 | ## ---------------------------------------------------------------------------- |
1d68af04 |
162 | ## Class::MOP needs to have a few things in the global perl environment so |
aa448b16 |
163 | ## that it can operate effectively. Those things are done here. |
164 | ## ---------------------------------------------------------------------------- |
165 | |
3bf7644b |
166 | # ... nothing yet actually ;) |
8b978dd5 |
167 | |
b51af7f9 |
168 | ## ---------------------------------------------------------------------------- |
1d68af04 |
169 | ## Bootstrapping |
b51af7f9 |
170 | ## ---------------------------------------------------------------------------- |
1d68af04 |
171 | ## The code below here is to bootstrap our MOP with itself. This is also |
b51af7f9 |
172 | ## sometimes called "tying the knot". By doing this, we make it much easier |
173 | ## to extend the MOP through subclassing and such since now you can use the |
1d68af04 |
174 | ## MOP itself to extend itself. |
175 | ## |
b51af7f9 |
176 | ## Yes, I know, thats weird and insane, but it's a good thing, trust me :) |
1d68af04 |
177 | ## ---------------------------------------------------------------------------- |
727919c5 |
178 | |
1d68af04 |
179 | # We need to add in the meta-attributes here so that |
180 | # any subclass of Class::MOP::* will be able to |
727919c5 |
181 | # inherit them using &construct_instance |
182 | |
f0480c45 |
183 | ## -------------------------------------------------------- |
6d5355c3 |
184 | ## Class::MOP::Package |
727919c5 |
185 | |
6d5355c3 |
186 | Class::MOP::Package->meta->add_attribute( |
8683db0e |
187 | Class::MOP::Attribute->new('package' => ( |
b880e0de |
188 | reader => { |
1d68af04 |
189 | # NOTE: we need to do this in order |
190 | # for the instance meta-object to |
b880e0de |
191 | # not fall into meta-circular death |
1d68af04 |
192 | # |
ce2ae40f |
193 | # we just alias the original method |
1d68af04 |
194 | # rather than re-produce it here |
ce2ae40f |
195 | 'name' => \&Class::MOP::Package::name |
b880e0de |
196 | }, |
727919c5 |
197 | )) |
198 | ); |
199 | |
a5e51f0b |
200 | Class::MOP::Package->meta->add_attribute( |
8683db0e |
201 | Class::MOP::Attribute->new('namespace' => ( |
a5e51f0b |
202 | reader => { |
56dcfc1a |
203 | # NOTE: |
ce2ae40f |
204 | # we just alias the original method |
205 | # rather than re-produce it here |
206 | 'namespace' => \&Class::MOP::Package::namespace |
a5e51f0b |
207 | }, |
2e877f58 |
208 | init_arg => undef, |
c4260b45 |
209 | default => sub { \undef } |
a5e51f0b |
210 | )) |
211 | ); |
212 | |
f0480c45 |
213 | ## -------------------------------------------------------- |
214 | ## Class::MOP::Module |
215 | |
216 | # NOTE: |
1d68af04 |
217 | # yeah this is kind of stretching things a bit, |
f0480c45 |
218 | # but truthfully the version should be an attribute |
1d68af04 |
219 | # of the Module, the weirdness comes from having to |
220 | # stick to Perl 5 convention and store it in the |
221 | # $VERSION package variable. Basically if you just |
222 | # squint at it, it will look how you want it to look. |
f0480c45 |
223 | # Either as a package variable, or as a attribute of |
224 | # the metaclass, isn't abstraction great :) |
225 | |
226 | Class::MOP::Module->meta->add_attribute( |
8683db0e |
227 | Class::MOP::Attribute->new('version' => ( |
f0480c45 |
228 | reader => { |
ce2ae40f |
229 | # NOTE: |
230 | # we just alias the original method |
1d68af04 |
231 | # rather than re-produce it here |
ce2ae40f |
232 | 'version' => \&Class::MOP::Module::version |
f0480c45 |
233 | }, |
2e877f58 |
234 | init_arg => undef, |
c4260b45 |
235 | default => sub { \undef } |
f0480c45 |
236 | )) |
237 | ); |
238 | |
239 | # NOTE: |
1d68af04 |
240 | # By following the same conventions as version here, |
241 | # we are opening up the possibility that people can |
242 | # use the $AUTHORITY in non-Class::MOP modules as |
243 | # well. |
f0480c45 |
244 | |
245 | Class::MOP::Module->meta->add_attribute( |
8683db0e |
246 | Class::MOP::Attribute->new('authority' => ( |
f0480c45 |
247 | reader => { |
ce2ae40f |
248 | # NOTE: |
249 | # we just alias the original method |
1d68af04 |
250 | # rather than re-produce it here |
ce2ae40f |
251 | 'authority' => \&Class::MOP::Module::authority |
1d68af04 |
252 | }, |
2e877f58 |
253 | init_arg => undef, |
c4260b45 |
254 | default => sub { \undef } |
f0480c45 |
255 | )) |
256 | ); |
257 | |
258 | ## -------------------------------------------------------- |
6d5355c3 |
259 | ## Class::MOP::Class |
260 | |
727919c5 |
261 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
262 | Class::MOP::Attribute->new('attributes' => ( |
f7259199 |
263 | reader => { |
1d68af04 |
264 | # NOTE: we need to do this in order |
265 | # for the instance meta-object to |
266 | # not fall into meta-circular death |
267 | # |
ce2ae40f |
268 | # we just alias the original method |
1d68af04 |
269 | # rather than re-produce it here |
ce2ae40f |
270 | 'get_attribute_map' => \&Class::MOP::Class::get_attribute_map |
f7259199 |
271 | }, |
727919c5 |
272 | default => sub { {} } |
273 | )) |
274 | ); |
275 | |
351bd7d4 |
276 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
277 | Class::MOP::Attribute->new('methods' => ( |
1d68af04 |
278 | reader => { |
ce2ae40f |
279 | # NOTE: |
280 | # we just alias the original method |
1d68af04 |
281 | # rather than re-produce it here |
ce2ae40f |
282 | 'get_method_map' => \&Class::MOP::Class::get_method_map |
92330ee2 |
283 | }, |
7855ddba |
284 | default => sub { {} } |
c4260b45 |
285 | )) |
286 | ); |
287 | |
288 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
289 | Class::MOP::Attribute->new('superclasses' => ( |
c23184fc |
290 | accessor => { |
291 | # NOTE: |
292 | # we just alias the original method |
1d68af04 |
293 | # rather than re-produce it here |
c23184fc |
294 | 'superclasses' => \&Class::MOP::Class::superclasses |
295 | }, |
2e877f58 |
296 | init_arg => undef, |
c23184fc |
297 | default => sub { \undef } |
298 | )) |
299 | ); |
300 | |
301 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
302 | Class::MOP::Attribute->new('attribute_metaclass' => ( |
1d68af04 |
303 | reader => { |
6d2118a4 |
304 | # NOTE: |
305 | # we just alias the original method |
1d68af04 |
306 | # rather than re-produce it here |
6d2118a4 |
307 | 'attribute_metaclass' => \&Class::MOP::Class::attribute_metaclass |
1d68af04 |
308 | }, |
351bd7d4 |
309 | default => 'Class::MOP::Attribute', |
310 | )) |
311 | ); |
312 | |
313 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
314 | Class::MOP::Attribute->new('method_metaclass' => ( |
1d68af04 |
315 | reader => { |
6d2118a4 |
316 | # NOTE: |
317 | # we just alias the original method |
1d68af04 |
318 | # rather than re-produce it here |
6d2118a4 |
319 | 'method_metaclass' => \&Class::MOP::Class::method_metaclass |
320 | }, |
1d68af04 |
321 | default => 'Class::MOP::Method', |
351bd7d4 |
322 | )) |
323 | ); |
324 | |
2bab2be6 |
325 | Class::MOP::Class->meta->add_attribute( |
77373da8 |
326 | Class::MOP::Attribute->new('wrapped_method_metaclass' => ( |
327 | reader => { |
328 | # NOTE: |
329 | # we just alias the original method |
330 | # rather than re-produce it here |
331 | 'wrapped_method_metaclass' => \&Class::MOP::Class::wrapped_method_metaclass |
332 | }, |
333 | default => 'Class::MOP::Method::Wrapped', |
334 | )) |
335 | ); |
336 | |
337 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
338 | Class::MOP::Attribute->new('instance_metaclass' => ( |
b880e0de |
339 | reader => { |
1d68af04 |
340 | # NOTE: we need to do this in order |
341 | # for the instance meta-object to |
342 | # not fall into meta-circular death |
343 | # |
ce2ae40f |
344 | # we just alias the original method |
1d68af04 |
345 | # rather than re-produce it here |
ce2ae40f |
346 | 'instance_metaclass' => \&Class::MOP::Class::instance_metaclass |
b880e0de |
347 | }, |
1d68af04 |
348 | default => 'Class::MOP::Instance', |
2bab2be6 |
349 | )) |
350 | ); |
351 | |
44d6ea77 |
352 | Class::MOP::Class->meta->add_attribute( |
353 | Class::MOP::Attribute->new('immutable_transformer' => ( |
354 | reader => { |
355 | 'immutable_transformer' => \&Class::MOP::Class::immutable_transformer |
356 | }, |
357 | writer => { |
358 | '_set_immutable_transformer' => \&Class::MOP::Class::_set_immutable_transformer |
359 | }, |
360 | )) |
361 | ); |
362 | |
9d6dce77 |
363 | # NOTE: |
1d68af04 |
364 | # we don't actually need to tie the knot with |
365 | # Class::MOP::Class here, it is actually handled |
366 | # within Class::MOP::Class itself in the |
367 | # construct_class_instance method. |
9d6dce77 |
368 | |
f0480c45 |
369 | ## -------------------------------------------------------- |
727919c5 |
370 | ## Class::MOP::Attribute |
371 | |
7b31baf4 |
372 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
373 | Class::MOP::Attribute->new('name' => ( |
c23184fc |
374 | reader => { |
1d68af04 |
375 | # NOTE: we need to do this in order |
376 | # for the instance meta-object to |
377 | # not fall into meta-circular death |
378 | # |
ce2ae40f |
379 | # we just alias the original method |
1d68af04 |
380 | # rather than re-produce it here |
ce2ae40f |
381 | 'name' => \&Class::MOP::Attribute::name |
b880e0de |
382 | } |
7b31baf4 |
383 | )) |
384 | ); |
385 | |
386 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
387 | Class::MOP::Attribute->new('associated_class' => ( |
c23184fc |
388 | reader => { |
1d68af04 |
389 | # NOTE: we need to do this in order |
390 | # for the instance meta-object to |
391 | # not fall into meta-circular death |
392 | # |
ce2ae40f |
393 | # we just alias the original method |
1d68af04 |
394 | # rather than re-produce it here |
ce2ae40f |
395 | 'associated_class' => \&Class::MOP::Attribute::associated_class |
b880e0de |
396 | } |
7b31baf4 |
397 | )) |
398 | ); |
399 | |
400 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
401 | Class::MOP::Attribute->new('accessor' => ( |
6d2118a4 |
402 | reader => { 'accessor' => \&Class::MOP::Attribute::accessor }, |
403 | predicate => { 'has_accessor' => \&Class::MOP::Attribute::has_accessor }, |
7b31baf4 |
404 | )) |
405 | ); |
406 | |
407 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
408 | Class::MOP::Attribute->new('reader' => ( |
6d2118a4 |
409 | reader => { 'reader' => \&Class::MOP::Attribute::reader }, |
410 | predicate => { 'has_reader' => \&Class::MOP::Attribute::has_reader }, |
7b31baf4 |
411 | )) |
412 | ); |
413 | |
414 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
415 | Class::MOP::Attribute->new('initializer' => ( |
8ee74136 |
416 | reader => { 'initializer' => \&Class::MOP::Attribute::initializer }, |
417 | predicate => { 'has_initializer' => \&Class::MOP::Attribute::has_initializer }, |
0ab65f99 |
418 | )) |
419 | ); |
420 | |
421 | Class::MOP::Attribute->meta->add_attribute( |
d9d99689 |
422 | Class::MOP::Attribute->new('definition_context' => ( |
423 | reader => { 'definition_context' => \&Class::MOP::Attribute::definition_context }, |
424 | )) |
425 | ); |
426 | |
427 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
428 | Class::MOP::Attribute->new('writer' => ( |
6d2118a4 |
429 | reader => { 'writer' => \&Class::MOP::Attribute::writer }, |
430 | predicate => { 'has_writer' => \&Class::MOP::Attribute::has_writer }, |
7b31baf4 |
431 | )) |
432 | ); |
433 | |
434 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
435 | Class::MOP::Attribute->new('predicate' => ( |
6d2118a4 |
436 | reader => { 'predicate' => \&Class::MOP::Attribute::predicate }, |
437 | predicate => { 'has_predicate' => \&Class::MOP::Attribute::has_predicate }, |
7b31baf4 |
438 | )) |
439 | ); |
440 | |
441 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
442 | Class::MOP::Attribute->new('clearer' => ( |
6d2118a4 |
443 | reader => { 'clearer' => \&Class::MOP::Attribute::clearer }, |
444 | predicate => { 'has_clearer' => \&Class::MOP::Attribute::has_clearer }, |
7d28758b |
445 | )) |
446 | ); |
447 | |
448 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
449 | Class::MOP::Attribute->new('builder' => ( |
1d68af04 |
450 | reader => { 'builder' => \&Class::MOP::Attribute::builder }, |
451 | predicate => { 'has_builder' => \&Class::MOP::Attribute::has_builder }, |
452 | )) |
453 | ); |
454 | |
455 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
456 | Class::MOP::Attribute->new('init_arg' => ( |
6d2118a4 |
457 | reader => { 'init_arg' => \&Class::MOP::Attribute::init_arg }, |
458 | predicate => { 'has_init_arg' => \&Class::MOP::Attribute::has_init_arg }, |
7b31baf4 |
459 | )) |
460 | ); |
461 | |
462 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
463 | Class::MOP::Attribute->new('default' => ( |
7b31baf4 |
464 | # default has a custom 'reader' method ... |
1d68af04 |
465 | predicate => { 'has_default' => \&Class::MOP::Attribute::has_default }, |
7b31baf4 |
466 | )) |
467 | ); |
468 | |
3545c727 |
469 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
470 | Class::MOP::Attribute->new('associated_methods' => ( |
c23184fc |
471 | reader => { 'associated_methods' => \&Class::MOP::Attribute::associated_methods }, |
1d68af04 |
472 | default => sub { [] } |
3545c727 |
473 | )) |
474 | ); |
727919c5 |
475 | |
5659d76e |
476 | Class::MOP::Attribute->meta->add_method('clone' => sub { |
a740253a |
477 | my $self = shift; |
1d68af04 |
478 | $self->meta->clone_object($self, @_); |
727919c5 |
479 | }); |
480 | |
f0480c45 |
481 | ## -------------------------------------------------------- |
b6164407 |
482 | ## Class::MOP::Method |
b6164407 |
483 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
484 | Class::MOP::Attribute->new('body' => ( |
c23184fc |
485 | reader => { 'body' => \&Class::MOP::Method::body }, |
b6164407 |
486 | )) |
487 | ); |
488 | |
4c105333 |
489 | Class::MOP::Method->meta->add_attribute( |
5e607260 |
490 | Class::MOP::Attribute->new('associated_metaclass' => ( |
5e607260 |
491 | reader => { 'associated_metaclass' => \&Class::MOP::Method::associated_metaclass }, |
492 | )) |
493 | ); |
494 | |
495 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
496 | Class::MOP::Attribute->new('package_name' => ( |
4c105333 |
497 | reader => { 'package_name' => \&Class::MOP::Method::package_name }, |
498 | )) |
499 | ); |
500 | |
501 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
502 | Class::MOP::Attribute->new('name' => ( |
4c105333 |
503 | reader => { 'name' => \&Class::MOP::Method::name }, |
504 | )) |
505 | ); |
506 | |
2226a8b0 |
507 | Class::MOP::Method->meta->add_attribute( |
508 | Class::MOP::Attribute->new('original_method' => ( |
509 | reader => { 'original_method' => \&Class::MOP::Method::original_method }, |
510 | writer => { '_set_original_method' => \&Class::MOP::Method::_set_original_method }, |
511 | )) |
512 | ); |
513 | |
4c105333 |
514 | Class::MOP::Method->meta->add_method('clone' => sub { |
515 | my $self = shift; |
2226a8b0 |
516 | my $clone = $self->meta->clone_object($self, @_); |
517 | $clone->_set_original_method($self); |
518 | return $clone; |
4c105333 |
519 | }); |
520 | |
b6164407 |
521 | ## -------------------------------------------------------- |
522 | ## Class::MOP::Method::Wrapped |
523 | |
524 | # NOTE: |
1d68af04 |
525 | # the way this item is initialized, this |
526 | # really does not follow the standard |
527 | # practices of attributes, but we put |
b6164407 |
528 | # it here for completeness |
529 | Class::MOP::Method::Wrapped->meta->add_attribute( |
8683db0e |
530 | Class::MOP::Attribute->new('modifier_table') |
b6164407 |
531 | ); |
532 | |
533 | ## -------------------------------------------------------- |
565f0cbb |
534 | ## Class::MOP::Method::Generated |
535 | |
536 | Class::MOP::Method::Generated->meta->add_attribute( |
8683db0e |
537 | Class::MOP::Attribute->new('is_inline' => ( |
565f0cbb |
538 | reader => { 'is_inline' => \&Class::MOP::Method::Generated::is_inline }, |
4c105333 |
539 | default => 0, |
1d68af04 |
540 | )) |
565f0cbb |
541 | ); |
542 | |
d9d99689 |
543 | Class::MOP::Method::Generated->meta->add_attribute( |
544 | Class::MOP::Attribute->new('definition_context' => ( |
545 | reader => { 'definition_context' => \&Class::MOP::Method::Generated::definition_context }, |
546 | )) |
547 | ); |
548 | |
565f0cbb |
549 | ## -------------------------------------------------------- |
d90b42a6 |
550 | ## Class::MOP::Method::Accessor |
551 | |
552 | Class::MOP::Method::Accessor->meta->add_attribute( |
8683db0e |
553 | Class::MOP::Attribute->new('attribute' => ( |
1d68af04 |
554 | reader => { |
555 | 'associated_attribute' => \&Class::MOP::Method::Accessor::associated_attribute |
d90b42a6 |
556 | }, |
1d68af04 |
557 | )) |
d90b42a6 |
558 | ); |
559 | |
560 | Class::MOP::Method::Accessor->meta->add_attribute( |
8683db0e |
561 | Class::MOP::Attribute->new('accessor_type' => ( |
c23184fc |
562 | reader => { 'accessor_type' => \&Class::MOP::Method::Accessor::accessor_type }, |
1d68af04 |
563 | )) |
d90b42a6 |
564 | ); |
565 | |
d90b42a6 |
566 | ## -------------------------------------------------------- |
567 | ## Class::MOP::Method::Constructor |
568 | |
569 | Class::MOP::Method::Constructor->meta->add_attribute( |
8683db0e |
570 | Class::MOP::Attribute->new('options' => ( |
1d68af04 |
571 | reader => { |
572 | 'options' => \&Class::MOP::Method::Constructor::options |
d90b42a6 |
573 | }, |
4c105333 |
574 | default => sub { +{} } |
1d68af04 |
575 | )) |
d90b42a6 |
576 | ); |
577 | |
578 | Class::MOP::Method::Constructor->meta->add_attribute( |
8683db0e |
579 | Class::MOP::Attribute->new('associated_metaclass' => ( |
e8a38403 |
580 | init_arg => "metaclass", # FIXME alias and rename |
1d68af04 |
581 | reader => { |
582 | 'associated_metaclass' => \&Class::MOP::Method::Constructor::associated_metaclass |
583 | }, |
584 | )) |
d90b42a6 |
585 | ); |
586 | |
587 | ## -------------------------------------------------------- |
86482605 |
588 | ## Class::MOP::Instance |
589 | |
590 | # NOTE: |
1d68af04 |
591 | # these don't yet do much of anything, but are just |
86482605 |
592 | # included for completeness |
593 | |
594 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
595 | Class::MOP::Attribute->new('associated_metaclass', |
596 | reader => { associated_metaclass => \&Class::MOP::Instance::associated_metaclass }, |
597 | ), |
86482605 |
598 | ); |
599 | |
600 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
601 | Class::MOP::Attribute->new('_class_name', |
602 | init_arg => undef, |
603 | reader => { _class_name => \&Class::MOP::Instance::_class_name }, |
604 | #lazy => 1, # not yet supported by Class::MOP but out our version does it anyway |
605 | #default => sub { $_[0]->associated_metaclass->name }, |
606 | ), |
607 | ); |
608 | |
609 | Class::MOP::Instance->meta->add_attribute( |
610 | Class::MOP::Attribute->new('attributes', |
0b5d46da |
611 | reader => { attributes => \&Class::MOP::Instance::get_all_attributes }, |
74890687 |
612 | ), |
32bfc810 |
613 | ); |
614 | |
615 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
616 | Class::MOP::Attribute->new('slots', |
617 | reader => { slots => \&Class::MOP::Instance::slots }, |
618 | ), |
86482605 |
619 | ); |
620 | |
63d08a9e |
621 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
622 | Class::MOP::Attribute->new('slot_hash', |
623 | reader => { slot_hash => \&Class::MOP::Instance::slot_hash }, |
624 | ), |
63d08a9e |
625 | ); |
626 | |
627 | |
caa051fa |
628 | # we need the meta instance of the meta instance to be created now, in order |
629 | # for the constructor to be able to use it |
630 | Class::MOP::Instance->meta->get_meta_instance; |
631 | |
caa051fa |
632 | # pretend the add_method never happenned. it hasn't yet affected anything |
633 | undef Class::MOP::Instance->meta->{_package_cache_flag}; |
634 | |
86482605 |
635 | ## -------------------------------------------------------- |
f0480c45 |
636 | ## Now close all the Class::MOP::* classes |
4d47b77f |
637 | |
1aa13cf4 |
638 | # NOTE: we don't need to inline the the accessors this only lengthens |
639 | # the compile time of the MOP, and gives us no actual benefits. |
0b9372a2 |
640 | |
641 | $_->meta->make_immutable( |
6c2f6b5c |
642 | inline_constructor => 1, |
643 | replace_constructor => 1, |
644 | constructor_name => "_new", |
45582002 |
645 | inline_accessors => 0, |
0b9372a2 |
646 | ) for qw/ |
1d68af04 |
647 | Class::MOP::Package |
648 | Class::MOP::Module |
649 | Class::MOP::Class |
650 | |
0b9372a2 |
651 | Class::MOP::Attribute |
1d68af04 |
652 | Class::MOP::Method |
653 | Class::MOP::Instance |
654 | |
655 | Class::MOP::Object |
0b9372a2 |
656 | |
565f0cbb |
657 | Class::MOP::Method::Generated |
1d68af04 |
658 | |
ba38bf08 |
659 | Class::MOP::Method::Accessor |
1d68af04 |
660 | Class::MOP::Method::Constructor |
661 | Class::MOP::Method::Wrapped |
0b9372a2 |
662 | /; |
b6164407 |
663 | |
94b19069 |
664 | 1; |
665 | |
666 | __END__ |
667 | |
668 | =pod |
669 | |
1d68af04 |
670 | =head1 NAME |
94b19069 |
671 | |
672 | Class::MOP - A Meta Object Protocol for Perl 5 |
673 | |
5b60bf98 |
674 | =head1 DESCRIPTION |
94b19069 |
675 | |
127d39a7 |
676 | This module is a fully functioning meta object protocol for the |
1d68af04 |
677 | Perl 5 object system. It makes no attempt to change the behavior or |
678 | characteristics of the Perl 5 object system, only to create a |
27e31eaf |
679 | protocol for its manipulation and introspection. |
94b19069 |
680 | |
828ecf13 |
681 | That said, it does attempt to create the tools for building a rich set |
682 | of extensions to the Perl 5 object system. Every attempt has been made |
683 | to abide by the spirit of the Perl 5 object system that we all know |
684 | and love. |
94b19069 |
685 | |
828ecf13 |
686 | This documentation is sparse on conceptual details. We suggest looking |
687 | at the items listed in the L<SEE ALSO> section for more |
688 | information. In particular the book "The Art of the Meta Object |
689 | Protocol" was very influential in the development of this system. |
40483095 |
690 | |
bfe4d0fc |
691 | =head2 What is a Meta Object Protocol? |
692 | |
1d68af04 |
693 | A meta object protocol is an API to an object system. |
bfe4d0fc |
694 | |
828ecf13 |
695 | To be more specific, it abstracts the components of an object system |
696 | (classes, object, methods, object attributes, etc.). These |
697 | abstractions can then be used to inspect and manipulate the object |
698 | system which they describe. |
bfe4d0fc |
699 | |
1d68af04 |
700 | It can be said that there are two MOPs for any object system; the |
828ecf13 |
701 | implicit MOP and the explicit MOP. The implicit MOP handles things |
1d68af04 |
702 | like method dispatch or inheritance, which happen automatically as |
703 | part of how the object system works. The explicit MOP typically |
704 | handles the introspection/reflection features of the object system. |
bfe4d0fc |
705 | |
828ecf13 |
706 | All object systems have implicit MOPs. Without one, they would not |
5b60bf98 |
707 | work. Explicit MOPs are much less common, and depending on the |
708 | language can vary from restrictive (Reflection in Java or C#) to wide |
709 | open (CLOS is a perfect example). |
e16da3e6 |
710 | |
828ecf13 |
711 | =head2 Yet Another Class Builder! Why? |
712 | |
713 | This is B<not> a class builder so much as a I<class builder |
714 | B<builder>>. The intent is that an end user will not use this module |
715 | directly, but instead this module is used by module authors to build |
716 | extensions and features onto the Perl 5 object system. |
717 | |
718 | This system is used by L<Moose>, which supplies a powerful class |
719 | builder system built entirely on top of C<Class::MOP>. |
e16da3e6 |
720 | |
94b19069 |
721 | =head2 Who is this module for? |
722 | |
828ecf13 |
723 | This module is for anyone who has ever created or wanted to create a |
724 | module for the Class:: namespace. The tools which this module provides |
725 | make doing complex Perl 5 wizardry simpler, by removing such barriers |
726 | as the need to hack symbol tables, or understand the fine details of |
727 | method dispatch. |
94b19069 |
728 | |
bfe4d0fc |
729 | =head2 What changes do I have to make to use this module? |
730 | |
828ecf13 |
731 | This module was designed to be as unintrusive as possible. Many of its |
5b60bf98 |
732 | features are accessible without B<any> change to your existing |
828ecf13 |
733 | code. It is meant to be a compliment to your existing code and not an |
734 | intrusion on your code base. Unlike many other B<Class::> modules, |
735 | this module B<does not> require you subclass it, or even that you |
736 | C<use> it in within your module's package. |
bfe4d0fc |
737 | |
1d68af04 |
738 | The only features which requires additions to your code are the |
2eb717d5 |
739 | attribute handling and instance construction features, and these are |
1d68af04 |
740 | both completely optional features. The only reason for this is because |
741 | Perl 5's object system does not actually have these features built |
2eb717d5 |
742 | in. More information about this feature can be found below. |
bfe4d0fc |
743 | |
828ecf13 |
744 | =head2 About Performance |
745 | |
5b60bf98 |
746 | It is a common misconception that explicit MOPs are a performance hit. |
828ecf13 |
747 | This is not a universal truth, it is a side-effect of some specific |
748 | implementations. For instance, using Java reflection is slow because |
749 | the JVM cannot take advantage of any compiler optimizations, and the |
750 | JVM has to deal with much more runtime type information as well. |
bfe4d0fc |
751 | |
828ecf13 |
752 | Reflection in C# is marginally better as it was designed into the |
753 | language and runtime (the CLR). In contrast, CLOS (the Common Lisp |
754 | Object System) was built to support an explicit MOP, and so |
755 | performance is tuned for it. |
1d68af04 |
756 | |
828ecf13 |
757 | This library in particular does its absolute best to avoid putting |
1d68af04 |
758 | B<any> drain at all upon your code's performance. In fact, by itself |
828ecf13 |
759 | it does nothing to affect your existing code. So you only pay for what |
760 | you actually use. |
bfe4d0fc |
761 | |
550d56db |
762 | =head2 About Metaclass compatibility |
763 | |
1d68af04 |
764 | This module makes sure that all metaclasses created are both upwards |
765 | and downwards compatible. The topic of metaclass compatibility is |
766 | highly esoteric and is something only encountered when doing deep and |
767 | involved metaclass hacking. There are two basic kinds of metaclass |
768 | incompatibility; upwards and downwards. |
550d56db |
769 | |
1d68af04 |
770 | Upwards metaclass compatibility means that the metaclass of a |
771 | given class is either the same as (or a subclass of) all of the |
550d56db |
772 | class's ancestors. |
773 | |
1d68af04 |
774 | Downward metaclass compatibility means that the metaclasses of a |
828ecf13 |
775 | given class's ancestors are all either the same as (or a subclass |
550d56db |
776 | of) that metaclass. |
777 | |
1d68af04 |
778 | Here is a diagram showing a set of two classes (C<A> and C<B>) and |
779 | two metaclasses (C<Meta::A> and C<Meta::B>) which have correct |
550d56db |
780 | metaclass compatibility both upwards and downwards. |
781 | |
782 | +---------+ +---------+ |
783 | | Meta::A |<----| Meta::B | <....... (instance of ) |
1d68af04 |
784 | +---------+ +---------+ <------- (inherits from) |
550d56db |
785 | ^ ^ |
786 | : : |
787 | +---------+ +---------+ |
788 | | A |<----| B | |
789 | +---------+ +---------+ |
790 | |
1d68af04 |
791 | As I said this is a highly esoteric topic and one you will only run |
828ecf13 |
792 | into if you do a lot of subclassing of L<Class::MOP::Class>. If you |
793 | are interested in why this is an issue see the paper I<Uniform and |
794 | safe metaclass composition> linked to in the L<SEE ALSO> section of |
795 | this document. |
550d56db |
796 | |
aa448b16 |
797 | =head2 Using custom metaclasses |
798 | |
828ecf13 |
799 | Always use the L<metaclass> pragma when using a custom metaclass, this |
5b60bf98 |
800 | will ensure the proper initialization order and not accidentally |
801 | create an incorrect type of metaclass for you. This is a very rare |
802 | problem, and one which can only occur if you are doing deep metaclass |
aa448b16 |
803 | programming. So in other words, don't worry about it. |
804 | |
828ecf13 |
805 | Note that if you're using L<Moose> we encourage you to I<not> use |
806 | L<metaclass> pragma, and instead use L<Moose::Util::MetaRole> to apply |
807 | roles to a class's metaclasses. This topic is covered at length in |
808 | various L<Moose::Cookbook> recipes. |
809 | |
94b19069 |
810 | =head1 PROTOCOLS |
811 | |
828ecf13 |
812 | The meta-object protocol is divided into 4 main sub-protocols: |
94b19069 |
813 | |
828ecf13 |
814 | =head2 The Class protocol |
94b19069 |
815 | |
1d68af04 |
816 | This provides a means of manipulating and introspecting a Perl 5 |
828ecf13 |
817 | class. It handles symbol table hacking for you, and provides a rich |
818 | set of methods that go beyond simple package introspection. |
94b19069 |
819 | |
552e3d24 |
820 | See L<Class::MOP::Class> for more details. |
821 | |
828ecf13 |
822 | =head2 The Attribute protocol |
94b19069 |
823 | |
828ecf13 |
824 | This provides a consistent representation for an attribute of a Perl 5 |
825 | class. Since there are so many ways to create and handle attributes in |
826 | Perl 5 OO, the Attribute protocol provide as much of a unified |
827 | approach as possible. Of course, you are always free to extend this |
828 | protocol by subclassing the appropriate classes. |
94b19069 |
829 | |
552e3d24 |
830 | See L<Class::MOP::Attribute> for more details. |
831 | |
828ecf13 |
832 | =head2 The Method protocol |
94b19069 |
833 | |
828ecf13 |
834 | This provides a means of manipulating and introspecting methods in the |
835 | Perl 5 object system. As with attributes, there are many ways to |
1d68af04 |
836 | approach this topic, so we try to keep it pretty basic, while still |
94b19069 |
837 | making it possible to extend the system in many ways. |
838 | |
552e3d24 |
839 | See L<Class::MOP::Method> for more details. |
94b19069 |
840 | |
828ecf13 |
841 | =head2 The Instance protocol |
127d39a7 |
842 | |
828ecf13 |
843 | This provides a layer of abstraction for creating object instances. |
844 | Since the other layers use this protocol, it is relatively easy to |
845 | change the type of your instances from the default hash reference to |
846 | some other type of reference. Several examples are provided in the |
847 | F<examples/> directory included in this distribution. |
127d39a7 |
848 | |
849 | See L<Class::MOP::Instance> for more details. |
850 | |
be7677c7 |
851 | =head1 FUNCTIONS |
852 | |
828ecf13 |
853 | Note that this module does not export any constants or functions. |
854 | |
c1d5345a |
855 | =head2 Constants |
856 | |
857 | =over 4 |
858 | |
828ecf13 |
859 | =item I<Class::MOP::IS_RUNNING_ON_5_10> |
c1d5345a |
860 | |
828ecf13 |
861 | We set this constant depending on what version perl we are on, this |
862 | allows us to take advantage of new 5.10 features and stay backwards |
5b60bf98 |
863 | compatible. |
c1d5345a |
864 | |
865 | =back |
866 | |
448b6e55 |
867 | =head2 Utility functions |
868 | |
bd07fbdb |
869 | Note that these are all called as B<functions, not methods>. |
081a927b |
870 | |
448b6e55 |
871 | =over 4 |
872 | |
828ecf13 |
873 | =item B<Class::MOP::load_class($class_name)> |
448b6e55 |
874 | |
828ecf13 |
875 | This will load the specified C<$class_name>. This function can be used |
876 | in place of tricks like C<eval "use $module"> or using C<require> |
01f3a099 |
877 | unconditionally. This will return the metaclass of C<$class_name>. |
448b6e55 |
878 | |
828ecf13 |
879 | =item B<Class::MOP::is_class_loaded($class_name)> |
448b6e55 |
880 | |
15ab5451 |
881 | Returns a boolean indicating whether or not C<$class_name> has been |
882 | loaded. |
448b6e55 |
883 | |
828ecf13 |
884 | This does a basic check of the symbol table to try and determine as |
885 | best it can if the C<$class_name> is loaded, it is probably correct |
886 | about 99% of the time, but it can be fooled into reporting false |
887 | positives. |
448b6e55 |
888 | |
cdac22cc |
889 | =item B<Class::MOP::get_code_info($code)> |
890 | |
891 | This function returns two values, the name of the package the C<$code> |
892 | is from and the name of the C<$code> itself. This is used by several |
5b60bf98 |
893 | elements of the MOP to determine where a given C<$code> reference is |
cdac22cc |
894 | from. |
895 | |
44ba77a3 |
896 | =item B<Class::MOP::class_of($instance_or_class_name)> |
897 | |
898 | This will return the metaclass of the given instance or class name. |
899 | Even if the class lacks a metaclass, no metaclass will be initialized |
900 | and C<undef> will be returned. |
901 | |
828ecf13 |
902 | =item B<Class::MOP::check_package_cache_flag($pkg)> |
e0e4674a |
903 | |
bd07fbdb |
904 | B<NOTE: DO NOT USE THIS FUNCTION, IT IS FOR INTERNAL USE ONLY!> |
905 | |
828ecf13 |
906 | This will return an integer that is managed by L<Class::MOP::Class> to |
907 | determine if a module's symbol table has been altered. |
127d39a7 |
908 | |
828ecf13 |
909 | In Perl 5.10 or greater, this flag is package specific. However in |
910 | versions prior to 5.10, this will use the C<PL_sub_generation> |
911 | variable which is not package specific. |
127d39a7 |
912 | |
828ecf13 |
913 | =item B<Class::MOP::load_first_existing_class(@class_names)> |
063ad0c5 |
914 | |
915 | B<NOTE: DO NOT USE THIS FUNCTION, IT IS FOR INTERNAL USE ONLY!> |
916 | |
917 | Given a list of class names, this function will attempt to load each |
918 | one in turn. |
919 | |
828ecf13 |
920 | If it finds a class it can load, it will return that class' name. If |
921 | none of the classes can be loaded, it will throw an exception. |
063ad0c5 |
922 | |
448b6e55 |
923 | =back |
924 | |
925 | =head2 Metaclass cache functions |
926 | |
6c842677 |
927 | Class::MOP holds a cache of metaclasses. The following are functions |
1d68af04 |
928 | (B<not methods>) which can be used to access that cache. It is not |
6c842677 |
929 | recommended that you mess with these. Bad things could happen, but if |
930 | you are brave and willing to risk it: go for it! |
be7677c7 |
931 | |
932 | =over 4 |
933 | |
828ecf13 |
934 | =item B<Class::MOP::get_all_metaclasses> |
be7677c7 |
935 | |
6c842677 |
936 | This will return a hash of all the metaclass instances that have |
828ecf13 |
937 | been cached by L<Class::MOP::Class>, keyed by the package name. |
b9d9fc0b |
938 | |
828ecf13 |
939 | =item B<Class::MOP::get_all_metaclass_instances> |
be7677c7 |
940 | |
6c842677 |
941 | This will return a list of all the metaclass instances that have |
828ecf13 |
942 | been cached by L<Class::MOP::Class>. |
b9d9fc0b |
943 | |
828ecf13 |
944 | =item B<Class::MOP::get_all_metaclass_names> |
be7677c7 |
945 | |
6c842677 |
946 | This will return a list of all the metaclass names that have |
828ecf13 |
947 | been cached by L<Class::MOP::Class>. |
b9d9fc0b |
948 | |
828ecf13 |
949 | =item B<Class::MOP::get_metaclass_by_name($name)> |
be7677c7 |
950 | |
828ecf13 |
951 | This will return a cached L<Class::MOP::Class> instance, or nothing |
6c842677 |
952 | if no metaclass exists with that C<$name>. |
127d39a7 |
953 | |
828ecf13 |
954 | =item B<Class::MOP::store_metaclass_by_name($name, $meta)> |
be7677c7 |
955 | |
127d39a7 |
956 | This will store a metaclass in the cache at the supplied C<$key>. |
957 | |
828ecf13 |
958 | =item B<Class::MOP::weaken_metaclass($name)> |
be7677c7 |
959 | |
6c842677 |
960 | In rare cases (e.g. anonymous metaclasses) it is desirable to |
961 | store a weakened reference in the metaclass cache. This |
962 | function will weaken the reference to the metaclass stored |
963 | in C<$name>. |
127d39a7 |
964 | |
828ecf13 |
965 | =item B<Class::MOP::does_metaclass_exist($name)> |
be7677c7 |
966 | |
828ecf13 |
967 | This will return true of there exists a metaclass stored in the |
6c842677 |
968 | C<$name> key, and return false otherwise. |
127d39a7 |
969 | |
828ecf13 |
970 | =item B<Class::MOP::remove_metaclass_by_name($name)> |
be7677c7 |
971 | |
6c842677 |
972 | This will remove the metaclass stored in the C<$name> key. |
127d39a7 |
973 | |
be7677c7 |
974 | =back |
975 | |
552e3d24 |
976 | =head1 SEE ALSO |
8b978dd5 |
977 | |
552e3d24 |
978 | =head2 Books |
8b978dd5 |
979 | |
1d68af04 |
980 | There are very few books out on Meta Object Protocols and Metaclasses |
981 | because it is such an esoteric topic. The following books are really |
982 | the only ones I have found. If you know of any more, B<I<please>> |
a2e85e6c |
983 | email me and let me know, I would love to hear about them. |
984 | |
8b978dd5 |
985 | =over 4 |
986 | |
15ab5451 |
987 | =item I<The Art of the Meta Object Protocol> |
8b978dd5 |
988 | |
15ab5451 |
989 | =item I<Advances in Object-Oriented Metalevel Architecture and Reflection> |
8b978dd5 |
990 | |
15ab5451 |
991 | =item I<Putting MetaClasses to Work> |
b51af7f9 |
992 | |
15ab5451 |
993 | =item I<Smalltalk: The Language> |
a2e85e6c |
994 | |
94b19069 |
995 | =back |
996 | |
550d56db |
997 | =head2 Papers |
998 | |
999 | =over 4 |
1000 | |
15ab5451 |
1001 | =item "Uniform and safe metaclass composition" |
550d56db |
1002 | |
1d68af04 |
1003 | An excellent paper by the people who brought us the original Traits paper. |
1004 | This paper is on how Traits can be used to do safe metaclass composition, |
1005 | and offers an excellent introduction section which delves into the topic of |
550d56db |
1006 | metaclass compatibility. |
1007 | |
1008 | L<http://www.iam.unibe.ch/~scg/Archive/Papers/Duca05ySafeMetaclassTrait.pdf> |
1009 | |
15ab5451 |
1010 | =item "Safe Metaclass Programming" |
550d56db |
1011 | |
1d68af04 |
1012 | This paper seems to precede the above paper, and propose a mix-in based |
1013 | approach as opposed to the Traits based approach. Both papers have similar |
1014 | information on the metaclass compatibility problem space. |
550d56db |
1015 | |
1016 | L<http://citeseer.ist.psu.edu/37617.html> |
1017 | |
1018 | =back |
1019 | |
552e3d24 |
1020 | =head2 Prior Art |
8b978dd5 |
1021 | |
1022 | =over 4 |
1023 | |
7184ca14 |
1024 | =item The Perl 6 MetaModel work in the Pugs project |
8b978dd5 |
1025 | |
1026 | =over 4 |
1027 | |
552e3d24 |
1028 | =item L<http://svn.openfoundry.org/pugs/perl5/Perl6-MetaModel> |
8b978dd5 |
1029 | |
552e3d24 |
1030 | =item L<http://svn.openfoundry.org/pugs/perl5/Perl6-ObjectSpace> |
8b978dd5 |
1031 | |
1032 | =back |
1033 | |
94b19069 |
1034 | =back |
1035 | |
1d68af04 |
1036 | =head2 Articles |
f8dfcfb7 |
1037 | |
1038 | =over 4 |
1039 | |
1d68af04 |
1040 | =item CPAN Module Review of Class::MOP |
f8dfcfb7 |
1041 | |
1042 | L<http://www.oreillynet.com/onlamp/blog/2006/06/cpan_module_review_classmop.html> |
1043 | |
1044 | =back |
1045 | |
a2e85e6c |
1046 | =head1 SIMILAR MODULES |
1047 | |
1d68af04 |
1048 | As I have said above, this module is a class-builder-builder, so it is |
1049 | not the same thing as modules like L<Class::Accessor> and |
1050 | L<Class::MethodMaker>. That being said there are very few modules on CPAN |
1051 | with similar goals to this module. The one I have found which is most |
1052 | like this module is L<Class::Meta>, although it's philosophy and the MOP it |
1053 | creates are very different from this modules. |
94b19069 |
1054 | |
a2e85e6c |
1055 | =head1 BUGS |
1056 | |
1d68af04 |
1057 | All complex software has bugs lurking in it, and this module is no |
a2e85e6c |
1058 | exception. If you find a bug please either email me, or add the bug |
1059 | to cpan-RT. |
1060 | |
1061 | =head1 ACKNOWLEDGEMENTS |
1062 | |
1063 | =over 4 |
1064 | |
b9d9fc0b |
1065 | =item Rob Kinyon |
a2e85e6c |
1066 | |
1d68af04 |
1067 | Thanks to Rob for actually getting the development of this module kick-started. |
a2e85e6c |
1068 | |
1069 | =back |
1070 | |
1a09d9cc |
1071 | =head1 AUTHORS |
94b19069 |
1072 | |
a2e85e6c |
1073 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
552e3d24 |
1074 | |
9c8cda90 |
1075 | B<with contributions from:> |
1076 | |
1077 | Brandon (blblack) Black |
1078 | |
4f116037 |
1079 | Florian (rafl) Ragwitz |
1080 | |
9c8cda90 |
1081 | Guillermo (groditi) Roditi |
1082 | |
9195ddff |
1083 | Matt (mst) Trout |
1084 | |
9c8cda90 |
1085 | Rob (robkinyon) Kinyon |
1086 | |
1087 | Yuval (nothingmuch) Kogman |
1a09d9cc |
1088 | |
f430cfa4 |
1089 | Scott (konobi) McWhirter |
1090 | |
94b19069 |
1091 | =head1 COPYRIGHT AND LICENSE |
1092 | |
070bb6c9 |
1093 | Copyright 2006-2009 by Infinity Interactive, Inc. |
94b19069 |
1094 | |
1095 | L<http://www.iinteractive.com> |
1096 | |
1097 | This library is free software; you can redistribute it and/or modify |
1d68af04 |
1098 | it under the same terms as Perl itself. |
94b19069 |
1099 | |
1100 | =cut |