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 | |
9efe16ca |
27 | *HAVE_ISAREV = defined(&mro::get_isarev) |
28 | ? sub () { 1 } |
29 | : sub () { 1 }; |
3ecd1b25 |
30 | |
31 | # this is either part of core or set up appropriately by MRO::Compat |
32 | *check_package_cache_flag = \&mro::get_pkg_gen; |
b1f5f41d |
33 | } |
e0e4674a |
34 | |
d7fe2508 |
35 | our $VERSION = '0.79'; |
8a7085c1 |
36 | our $XS_VERSION = $VERSION; |
d519662a |
37 | $VERSION = eval $VERSION; |
fc4f8f91 |
38 | our $AUTHORITY = 'cpan:STEVAN'; |
9d655b6d |
39 | |
4bfa5ddb |
40 | require XSLoader; |
41 | XSLoader::load( __PACKAGE__, $XS_VERSION ); |
d7bda114 |
42 | |
43 | |
be7677c7 |
44 | { |
45 | # Metaclasses are singletons, so we cache them here. |
46 | # there is no need to worry about destruction though |
47 | # because they should die only when the program dies. |
48 | # After all, do package definitions even get reaped? |
1d68af04 |
49 | my %METAS; |
50 | |
51 | # means of accessing all the metaclasses that have |
be7677c7 |
52 | # been initialized thus far (for mugwumps obj browser) |
1d68af04 |
53 | sub get_all_metaclasses { %METAS } |
54 | sub get_all_metaclass_instances { values %METAS } |
55 | sub get_all_metaclass_names { keys %METAS } |
be7677c7 |
56 | sub get_metaclass_by_name { $METAS{$_[0]} } |
1d68af04 |
57 | sub store_metaclass_by_name { $METAS{$_[0]} = $_[1] } |
58 | sub weaken_metaclass { weaken($METAS{$_[0]}) } |
be7677c7 |
59 | sub does_metaclass_exist { exists $METAS{$_[0]} && defined $METAS{$_[0]} } |
1d68af04 |
60 | sub remove_metaclass_by_name { $METAS{$_[0]} = undef } |
61 | |
86866fb5 |
62 | # This handles instances as well as class names |
63 | sub class_of { |
64 | my $class = blessed($_[0]) || $_[0]; |
65 | return $METAS{$class}; |
66 | } |
67 | |
be7677c7 |
68 | # NOTE: |
1d68af04 |
69 | # We only cache metaclasses, meaning instances of |
70 | # Class::MOP::Class. We do not cache instance of |
be7677c7 |
71 | # Class::MOP::Package or Class::MOP::Module. Mostly |
1d68af04 |
72 | # because I don't yet see a good reason to do so. |
be7677c7 |
73 | } |
74 | |
44da14be |
75 | sub _class_to_pmfile { |
76 | my $class = shift; |
77 | |
78 | my $file = $class . '.pm'; |
79 | $file =~ s{::}{/}g; |
80 | |
81 | return $file; |
82 | } |
83 | |
063ad0c5 |
84 | sub load_first_existing_class { |
f280f05c |
85 | my @classes = @_ |
86 | or return; |
5a24cf8a |
87 | |
88 | foreach my $class (@classes) { |
89 | unless ( _is_valid_class_name($class) ) { |
90 | my $display = defined($class) ? $class : 'undef'; |
91 | confess "Invalid class name ($display)"; |
92 | } |
ab5e2f48 |
93 | } |
94 | |
063ad0c5 |
95 | my $found; |
5a24cf8a |
96 | my %exceptions; |
063ad0c5 |
97 | for my $class (@classes) { |
44da14be |
98 | my $pmfile = _class_to_pmfile($class); |
063ad0c5 |
99 | my $e = _try_load_one_class($class); |
100 | |
5a24cf8a |
101 | if ($e) { |
063ad0c5 |
102 | $exceptions{$class} = $e; |
44da14be |
103 | last if $e !~ /^Can't locate \Q$pmfile\E in \@INC/; |
5a24cf8a |
104 | } |
105 | else { |
063ad0c5 |
106 | $found = $class; |
107 | last; |
5a24cf8a |
108 | } |
063ad0c5 |
109 | } |
5a24cf8a |
110 | |
1d8153bd |
111 | return $found if $found; |
07940968 |
112 | |
063ad0c5 |
113 | confess join( |
114 | "\n", |
115 | map { |
116 | sprintf( |
fea44045 |
117 | "Could not load class (%s) because : %s", $_, |
063ad0c5 |
118 | $exceptions{$_} |
119 | ) |
44da14be |
120 | } |
121 | grep { |
122 | exists $exceptions{$_} |
063ad0c5 |
123 | } @classes |
f280f05c |
124 | ); |
5a24cf8a |
125 | } |
126 | |
063ad0c5 |
127 | sub _try_load_one_class { |
128 | my $class = shift; |
129 | |
130 | return if is_class_loaded($class); |
44da14be |
131 | |
132 | my $file = _class_to_pmfile($class); |
063ad0c5 |
133 | |
134 | return do { |
135 | local $@; |
136 | eval { require($file) }; |
137 | $@; |
138 | }; |
139 | } |
140 | |
5a24cf8a |
141 | sub load_class { |
1d8153bd |
142 | my $class = load_first_existing_class($_[0]); |
143 | return get_metaclass_by_name($class) || $class; |
448b6e55 |
144 | } |
145 | |
2c0fb064 |
146 | sub _is_valid_class_name { |
147 | my $class = shift; |
148 | |
149 | return 0 if ref($class); |
150 | return 0 unless defined($class); |
151 | return 0 unless length($class); |
152 | |
153 | return 1 if $class =~ /^\w+(?:::\w+)*$/; |
154 | |
155 | return 0; |
156 | } |
157 | |
aa448b16 |
158 | ## ---------------------------------------------------------------------------- |
159 | ## Setting up our environment ... |
160 | ## ---------------------------------------------------------------------------- |
1d68af04 |
161 | ## Class::MOP needs to have a few things in the global perl environment so |
aa448b16 |
162 | ## that it can operate effectively. Those things are done here. |
163 | ## ---------------------------------------------------------------------------- |
164 | |
3bf7644b |
165 | # ... nothing yet actually ;) |
8b978dd5 |
166 | |
b51af7f9 |
167 | ## ---------------------------------------------------------------------------- |
1d68af04 |
168 | ## Bootstrapping |
b51af7f9 |
169 | ## ---------------------------------------------------------------------------- |
1d68af04 |
170 | ## The code below here is to bootstrap our MOP with itself. This is also |
b51af7f9 |
171 | ## sometimes called "tying the knot". By doing this, we make it much easier |
172 | ## to extend the MOP through subclassing and such since now you can use the |
1d68af04 |
173 | ## MOP itself to extend itself. |
174 | ## |
b51af7f9 |
175 | ## Yes, I know, thats weird and insane, but it's a good thing, trust me :) |
1d68af04 |
176 | ## ---------------------------------------------------------------------------- |
727919c5 |
177 | |
1d68af04 |
178 | # We need to add in the meta-attributes here so that |
179 | # any subclass of Class::MOP::* will be able to |
727919c5 |
180 | # inherit them using &construct_instance |
181 | |
f0480c45 |
182 | ## -------------------------------------------------------- |
6d5355c3 |
183 | ## Class::MOP::Package |
727919c5 |
184 | |
6d5355c3 |
185 | Class::MOP::Package->meta->add_attribute( |
8683db0e |
186 | Class::MOP::Attribute->new('package' => ( |
b880e0de |
187 | reader => { |
1d68af04 |
188 | # NOTE: we need to do this in order |
189 | # for the instance meta-object to |
b880e0de |
190 | # not fall into meta-circular death |
1d68af04 |
191 | # |
ce2ae40f |
192 | # we just alias the original method |
1d68af04 |
193 | # rather than re-produce it here |
ce2ae40f |
194 | 'name' => \&Class::MOP::Package::name |
b880e0de |
195 | }, |
727919c5 |
196 | )) |
197 | ); |
198 | |
a5e51f0b |
199 | Class::MOP::Package->meta->add_attribute( |
8683db0e |
200 | Class::MOP::Attribute->new('namespace' => ( |
a5e51f0b |
201 | reader => { |
56dcfc1a |
202 | # NOTE: |
ce2ae40f |
203 | # we just alias the original method |
204 | # rather than re-produce it here |
205 | 'namespace' => \&Class::MOP::Package::namespace |
a5e51f0b |
206 | }, |
2e877f58 |
207 | init_arg => undef, |
c4260b45 |
208 | default => sub { \undef } |
a5e51f0b |
209 | )) |
210 | ); |
211 | |
f0480c45 |
212 | ## -------------------------------------------------------- |
213 | ## Class::MOP::Module |
214 | |
215 | # NOTE: |
1d68af04 |
216 | # yeah this is kind of stretching things a bit, |
f0480c45 |
217 | # but truthfully the version should be an attribute |
1d68af04 |
218 | # of the Module, the weirdness comes from having to |
219 | # stick to Perl 5 convention and store it in the |
220 | # $VERSION package variable. Basically if you just |
221 | # squint at it, it will look how you want it to look. |
f0480c45 |
222 | # Either as a package variable, or as a attribute of |
223 | # the metaclass, isn't abstraction great :) |
224 | |
225 | Class::MOP::Module->meta->add_attribute( |
8683db0e |
226 | Class::MOP::Attribute->new('version' => ( |
f0480c45 |
227 | reader => { |
ce2ae40f |
228 | # NOTE: |
229 | # we just alias the original method |
1d68af04 |
230 | # rather than re-produce it here |
ce2ae40f |
231 | 'version' => \&Class::MOP::Module::version |
f0480c45 |
232 | }, |
2e877f58 |
233 | init_arg => undef, |
c4260b45 |
234 | default => sub { \undef } |
f0480c45 |
235 | )) |
236 | ); |
237 | |
238 | # NOTE: |
1d68af04 |
239 | # By following the same conventions as version here, |
240 | # we are opening up the possibility that people can |
241 | # use the $AUTHORITY in non-Class::MOP modules as |
242 | # well. |
f0480c45 |
243 | |
244 | Class::MOP::Module->meta->add_attribute( |
8683db0e |
245 | Class::MOP::Attribute->new('authority' => ( |
f0480c45 |
246 | reader => { |
ce2ae40f |
247 | # NOTE: |
248 | # we just alias the original method |
1d68af04 |
249 | # rather than re-produce it here |
ce2ae40f |
250 | 'authority' => \&Class::MOP::Module::authority |
1d68af04 |
251 | }, |
2e877f58 |
252 | init_arg => undef, |
c4260b45 |
253 | default => sub { \undef } |
f0480c45 |
254 | )) |
255 | ); |
256 | |
257 | ## -------------------------------------------------------- |
6d5355c3 |
258 | ## Class::MOP::Class |
259 | |
727919c5 |
260 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
261 | Class::MOP::Attribute->new('attributes' => ( |
f7259199 |
262 | reader => { |
1d68af04 |
263 | # NOTE: we need to do this in order |
264 | # for the instance meta-object to |
265 | # not fall into meta-circular death |
266 | # |
ce2ae40f |
267 | # we just alias the original method |
1d68af04 |
268 | # rather than re-produce it here |
ce2ae40f |
269 | 'get_attribute_map' => \&Class::MOP::Class::get_attribute_map |
f7259199 |
270 | }, |
727919c5 |
271 | default => sub { {} } |
272 | )) |
273 | ); |
274 | |
351bd7d4 |
275 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
276 | Class::MOP::Attribute->new('methods' => ( |
1d68af04 |
277 | reader => { |
ce2ae40f |
278 | # NOTE: |
279 | # we just alias the original method |
1d68af04 |
280 | # rather than re-produce it here |
ce2ae40f |
281 | 'get_method_map' => \&Class::MOP::Class::get_method_map |
92330ee2 |
282 | }, |
7855ddba |
283 | default => sub { {} } |
c4260b45 |
284 | )) |
285 | ); |
286 | |
287 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
288 | Class::MOP::Attribute->new('superclasses' => ( |
c23184fc |
289 | accessor => { |
290 | # NOTE: |
291 | # we just alias the original method |
1d68af04 |
292 | # rather than re-produce it here |
c23184fc |
293 | 'superclasses' => \&Class::MOP::Class::superclasses |
294 | }, |
2e877f58 |
295 | init_arg => undef, |
c23184fc |
296 | default => sub { \undef } |
297 | )) |
298 | ); |
299 | |
300 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
301 | Class::MOP::Attribute->new('attribute_metaclass' => ( |
1d68af04 |
302 | reader => { |
6d2118a4 |
303 | # NOTE: |
304 | # we just alias the original method |
1d68af04 |
305 | # rather than re-produce it here |
6d2118a4 |
306 | 'attribute_metaclass' => \&Class::MOP::Class::attribute_metaclass |
1d68af04 |
307 | }, |
351bd7d4 |
308 | default => 'Class::MOP::Attribute', |
309 | )) |
310 | ); |
311 | |
312 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
313 | Class::MOP::Attribute->new('method_metaclass' => ( |
1d68af04 |
314 | reader => { |
6d2118a4 |
315 | # NOTE: |
316 | # we just alias the original method |
1d68af04 |
317 | # rather than re-produce it here |
6d2118a4 |
318 | 'method_metaclass' => \&Class::MOP::Class::method_metaclass |
319 | }, |
1d68af04 |
320 | default => 'Class::MOP::Method', |
351bd7d4 |
321 | )) |
322 | ); |
323 | |
2bab2be6 |
324 | Class::MOP::Class->meta->add_attribute( |
77373da8 |
325 | Class::MOP::Attribute->new('wrapped_method_metaclass' => ( |
326 | reader => { |
327 | # NOTE: |
328 | # we just alias the original method |
329 | # rather than re-produce it here |
330 | 'wrapped_method_metaclass' => \&Class::MOP::Class::wrapped_method_metaclass |
331 | }, |
332 | default => 'Class::MOP::Method::Wrapped', |
333 | )) |
334 | ); |
335 | |
336 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
337 | Class::MOP::Attribute->new('instance_metaclass' => ( |
b880e0de |
338 | reader => { |
1d68af04 |
339 | # NOTE: we need to do this in order |
340 | # for the instance meta-object to |
341 | # not fall into meta-circular death |
342 | # |
ce2ae40f |
343 | # we just alias the original method |
1d68af04 |
344 | # rather than re-produce it here |
ce2ae40f |
345 | 'instance_metaclass' => \&Class::MOP::Class::instance_metaclass |
b880e0de |
346 | }, |
1d68af04 |
347 | default => 'Class::MOP::Instance', |
2bab2be6 |
348 | )) |
349 | ); |
350 | |
44d6ea77 |
351 | Class::MOP::Class->meta->add_attribute( |
352 | Class::MOP::Attribute->new('immutable_transformer' => ( |
353 | reader => { |
354 | 'immutable_transformer' => \&Class::MOP::Class::immutable_transformer |
355 | }, |
356 | writer => { |
357 | '_set_immutable_transformer' => \&Class::MOP::Class::_set_immutable_transformer |
358 | }, |
359 | )) |
360 | ); |
361 | |
9d6dce77 |
362 | # NOTE: |
1d68af04 |
363 | # we don't actually need to tie the knot with |
364 | # Class::MOP::Class here, it is actually handled |
365 | # within Class::MOP::Class itself in the |
366 | # construct_class_instance method. |
9d6dce77 |
367 | |
f0480c45 |
368 | ## -------------------------------------------------------- |
727919c5 |
369 | ## Class::MOP::Attribute |
370 | |
7b31baf4 |
371 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
372 | Class::MOP::Attribute->new('name' => ( |
c23184fc |
373 | reader => { |
1d68af04 |
374 | # NOTE: we need to do this in order |
375 | # for the instance meta-object to |
376 | # not fall into meta-circular death |
377 | # |
ce2ae40f |
378 | # we just alias the original method |
1d68af04 |
379 | # rather than re-produce it here |
ce2ae40f |
380 | 'name' => \&Class::MOP::Attribute::name |
b880e0de |
381 | } |
7b31baf4 |
382 | )) |
383 | ); |
384 | |
385 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
386 | Class::MOP::Attribute->new('associated_class' => ( |
c23184fc |
387 | reader => { |
1d68af04 |
388 | # NOTE: we need to do this in order |
389 | # for the instance meta-object to |
390 | # not fall into meta-circular death |
391 | # |
ce2ae40f |
392 | # we just alias the original method |
1d68af04 |
393 | # rather than re-produce it here |
ce2ae40f |
394 | 'associated_class' => \&Class::MOP::Attribute::associated_class |
b880e0de |
395 | } |
7b31baf4 |
396 | )) |
397 | ); |
398 | |
399 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
400 | Class::MOP::Attribute->new('accessor' => ( |
6d2118a4 |
401 | reader => { 'accessor' => \&Class::MOP::Attribute::accessor }, |
402 | predicate => { 'has_accessor' => \&Class::MOP::Attribute::has_accessor }, |
7b31baf4 |
403 | )) |
404 | ); |
405 | |
406 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
407 | Class::MOP::Attribute->new('reader' => ( |
6d2118a4 |
408 | reader => { 'reader' => \&Class::MOP::Attribute::reader }, |
409 | predicate => { 'has_reader' => \&Class::MOP::Attribute::has_reader }, |
7b31baf4 |
410 | )) |
411 | ); |
412 | |
413 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
414 | Class::MOP::Attribute->new('initializer' => ( |
8ee74136 |
415 | reader => { 'initializer' => \&Class::MOP::Attribute::initializer }, |
416 | predicate => { 'has_initializer' => \&Class::MOP::Attribute::has_initializer }, |
0ab65f99 |
417 | )) |
418 | ); |
419 | |
420 | Class::MOP::Attribute->meta->add_attribute( |
d9d99689 |
421 | Class::MOP::Attribute->new('definition_context' => ( |
422 | reader => { 'definition_context' => \&Class::MOP::Attribute::definition_context }, |
423 | )) |
424 | ); |
425 | |
426 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
427 | Class::MOP::Attribute->new('writer' => ( |
6d2118a4 |
428 | reader => { 'writer' => \&Class::MOP::Attribute::writer }, |
429 | predicate => { 'has_writer' => \&Class::MOP::Attribute::has_writer }, |
7b31baf4 |
430 | )) |
431 | ); |
432 | |
433 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
434 | Class::MOP::Attribute->new('predicate' => ( |
6d2118a4 |
435 | reader => { 'predicate' => \&Class::MOP::Attribute::predicate }, |
436 | predicate => { 'has_predicate' => \&Class::MOP::Attribute::has_predicate }, |
7b31baf4 |
437 | )) |
438 | ); |
439 | |
440 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
441 | Class::MOP::Attribute->new('clearer' => ( |
6d2118a4 |
442 | reader => { 'clearer' => \&Class::MOP::Attribute::clearer }, |
443 | predicate => { 'has_clearer' => \&Class::MOP::Attribute::has_clearer }, |
7d28758b |
444 | )) |
445 | ); |
446 | |
447 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
448 | Class::MOP::Attribute->new('builder' => ( |
1d68af04 |
449 | reader => { 'builder' => \&Class::MOP::Attribute::builder }, |
450 | predicate => { 'has_builder' => \&Class::MOP::Attribute::has_builder }, |
451 | )) |
452 | ); |
453 | |
454 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
455 | Class::MOP::Attribute->new('init_arg' => ( |
6d2118a4 |
456 | reader => { 'init_arg' => \&Class::MOP::Attribute::init_arg }, |
457 | predicate => { 'has_init_arg' => \&Class::MOP::Attribute::has_init_arg }, |
7b31baf4 |
458 | )) |
459 | ); |
460 | |
461 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
462 | Class::MOP::Attribute->new('default' => ( |
7b31baf4 |
463 | # default has a custom 'reader' method ... |
1d68af04 |
464 | predicate => { 'has_default' => \&Class::MOP::Attribute::has_default }, |
7b31baf4 |
465 | )) |
466 | ); |
467 | |
3545c727 |
468 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
469 | Class::MOP::Attribute->new('associated_methods' => ( |
c23184fc |
470 | reader => { 'associated_methods' => \&Class::MOP::Attribute::associated_methods }, |
1d68af04 |
471 | default => sub { [] } |
3545c727 |
472 | )) |
473 | ); |
727919c5 |
474 | |
5659d76e |
475 | Class::MOP::Attribute->meta->add_method('clone' => sub { |
a740253a |
476 | my $self = shift; |
1d68af04 |
477 | $self->meta->clone_object($self, @_); |
727919c5 |
478 | }); |
479 | |
f0480c45 |
480 | ## -------------------------------------------------------- |
b6164407 |
481 | ## Class::MOP::Method |
b6164407 |
482 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
483 | Class::MOP::Attribute->new('body' => ( |
c23184fc |
484 | reader => { 'body' => \&Class::MOP::Method::body }, |
b6164407 |
485 | )) |
486 | ); |
487 | |
4c105333 |
488 | Class::MOP::Method->meta->add_attribute( |
5e607260 |
489 | Class::MOP::Attribute->new('associated_metaclass' => ( |
5e607260 |
490 | reader => { 'associated_metaclass' => \&Class::MOP::Method::associated_metaclass }, |
491 | )) |
492 | ); |
493 | |
494 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
495 | Class::MOP::Attribute->new('package_name' => ( |
4c105333 |
496 | reader => { 'package_name' => \&Class::MOP::Method::package_name }, |
497 | )) |
498 | ); |
499 | |
500 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
501 | Class::MOP::Attribute->new('name' => ( |
4c105333 |
502 | reader => { 'name' => \&Class::MOP::Method::name }, |
503 | )) |
504 | ); |
505 | |
2226a8b0 |
506 | Class::MOP::Method->meta->add_attribute( |
507 | Class::MOP::Attribute->new('original_method' => ( |
508 | reader => { 'original_method' => \&Class::MOP::Method::original_method }, |
509 | writer => { '_set_original_method' => \&Class::MOP::Method::_set_original_method }, |
510 | )) |
511 | ); |
512 | |
4c105333 |
513 | Class::MOP::Method->meta->add_method('clone' => sub { |
514 | my $self = shift; |
2226a8b0 |
515 | my $clone = $self->meta->clone_object($self, @_); |
516 | $clone->_set_original_method($self); |
517 | return $clone; |
4c105333 |
518 | }); |
519 | |
b6164407 |
520 | ## -------------------------------------------------------- |
521 | ## Class::MOP::Method::Wrapped |
522 | |
523 | # NOTE: |
1d68af04 |
524 | # the way this item is initialized, this |
525 | # really does not follow the standard |
526 | # practices of attributes, but we put |
b6164407 |
527 | # it here for completeness |
528 | Class::MOP::Method::Wrapped->meta->add_attribute( |
8683db0e |
529 | Class::MOP::Attribute->new('modifier_table') |
b6164407 |
530 | ); |
531 | |
532 | ## -------------------------------------------------------- |
565f0cbb |
533 | ## Class::MOP::Method::Generated |
534 | |
535 | Class::MOP::Method::Generated->meta->add_attribute( |
8683db0e |
536 | Class::MOP::Attribute->new('is_inline' => ( |
565f0cbb |
537 | reader => { 'is_inline' => \&Class::MOP::Method::Generated::is_inline }, |
4c105333 |
538 | default => 0, |
1d68af04 |
539 | )) |
565f0cbb |
540 | ); |
541 | |
d9d99689 |
542 | Class::MOP::Method::Generated->meta->add_attribute( |
543 | Class::MOP::Attribute->new('definition_context' => ( |
544 | reader => { 'definition_context' => \&Class::MOP::Method::Generated::definition_context }, |
545 | )) |
546 | ); |
547 | |
565f0cbb |
548 | ## -------------------------------------------------------- |
d90b42a6 |
549 | ## Class::MOP::Method::Accessor |
550 | |
551 | Class::MOP::Method::Accessor->meta->add_attribute( |
8683db0e |
552 | Class::MOP::Attribute->new('attribute' => ( |
1d68af04 |
553 | reader => { |
554 | 'associated_attribute' => \&Class::MOP::Method::Accessor::associated_attribute |
d90b42a6 |
555 | }, |
1d68af04 |
556 | )) |
d90b42a6 |
557 | ); |
558 | |
559 | Class::MOP::Method::Accessor->meta->add_attribute( |
8683db0e |
560 | Class::MOP::Attribute->new('accessor_type' => ( |
c23184fc |
561 | reader => { 'accessor_type' => \&Class::MOP::Method::Accessor::accessor_type }, |
1d68af04 |
562 | )) |
d90b42a6 |
563 | ); |
564 | |
d90b42a6 |
565 | ## -------------------------------------------------------- |
566 | ## Class::MOP::Method::Constructor |
567 | |
568 | Class::MOP::Method::Constructor->meta->add_attribute( |
8683db0e |
569 | Class::MOP::Attribute->new('options' => ( |
1d68af04 |
570 | reader => { |
571 | 'options' => \&Class::MOP::Method::Constructor::options |
d90b42a6 |
572 | }, |
4c105333 |
573 | default => sub { +{} } |
1d68af04 |
574 | )) |
d90b42a6 |
575 | ); |
576 | |
577 | Class::MOP::Method::Constructor->meta->add_attribute( |
8683db0e |
578 | Class::MOP::Attribute->new('associated_metaclass' => ( |
e8a38403 |
579 | init_arg => "metaclass", # FIXME alias and rename |
1d68af04 |
580 | reader => { |
581 | 'associated_metaclass' => \&Class::MOP::Method::Constructor::associated_metaclass |
582 | }, |
583 | )) |
d90b42a6 |
584 | ); |
585 | |
586 | ## -------------------------------------------------------- |
86482605 |
587 | ## Class::MOP::Instance |
588 | |
589 | # NOTE: |
1d68af04 |
590 | # these don't yet do much of anything, but are just |
86482605 |
591 | # included for completeness |
592 | |
593 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
594 | Class::MOP::Attribute->new('associated_metaclass', |
595 | reader => { associated_metaclass => \&Class::MOP::Instance::associated_metaclass }, |
596 | ), |
86482605 |
597 | ); |
598 | |
599 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
600 | Class::MOP::Attribute->new('_class_name', |
601 | init_arg => undef, |
602 | reader => { _class_name => \&Class::MOP::Instance::_class_name }, |
603 | #lazy => 1, # not yet supported by Class::MOP but out our version does it anyway |
604 | #default => sub { $_[0]->associated_metaclass->name }, |
605 | ), |
606 | ); |
607 | |
608 | Class::MOP::Instance->meta->add_attribute( |
609 | Class::MOP::Attribute->new('attributes', |
0b5d46da |
610 | reader => { attributes => \&Class::MOP::Instance::get_all_attributes }, |
74890687 |
611 | ), |
32bfc810 |
612 | ); |
613 | |
614 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
615 | Class::MOP::Attribute->new('slots', |
616 | reader => { slots => \&Class::MOP::Instance::slots }, |
617 | ), |
86482605 |
618 | ); |
619 | |
63d08a9e |
620 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
621 | Class::MOP::Attribute->new('slot_hash', |
622 | reader => { slot_hash => \&Class::MOP::Instance::slot_hash }, |
623 | ), |
63d08a9e |
624 | ); |
625 | |
626 | |
caa051fa |
627 | # we need the meta instance of the meta instance to be created now, in order |
628 | # for the constructor to be able to use it |
629 | Class::MOP::Instance->meta->get_meta_instance; |
630 | |
caa051fa |
631 | # pretend the add_method never happenned. it hasn't yet affected anything |
632 | undef Class::MOP::Instance->meta->{_package_cache_flag}; |
633 | |
86482605 |
634 | ## -------------------------------------------------------- |
f0480c45 |
635 | ## Now close all the Class::MOP::* classes |
4d47b77f |
636 | |
1aa13cf4 |
637 | # NOTE: we don't need to inline the the accessors this only lengthens |
638 | # the compile time of the MOP, and gives us no actual benefits. |
0b9372a2 |
639 | |
640 | $_->meta->make_immutable( |
6c2f6b5c |
641 | inline_constructor => 1, |
642 | replace_constructor => 1, |
643 | constructor_name => "_new", |
45582002 |
644 | inline_accessors => 0, |
0b9372a2 |
645 | ) for qw/ |
1d68af04 |
646 | Class::MOP::Package |
647 | Class::MOP::Module |
648 | Class::MOP::Class |
649 | |
0b9372a2 |
650 | Class::MOP::Attribute |
1d68af04 |
651 | Class::MOP::Method |
652 | Class::MOP::Instance |
653 | |
654 | Class::MOP::Object |
0b9372a2 |
655 | |
565f0cbb |
656 | Class::MOP::Method::Generated |
1d68af04 |
657 | |
ba38bf08 |
658 | Class::MOP::Method::Accessor |
1d68af04 |
659 | Class::MOP::Method::Constructor |
660 | Class::MOP::Method::Wrapped |
0b9372a2 |
661 | /; |
b6164407 |
662 | |
94b19069 |
663 | 1; |
664 | |
665 | __END__ |
666 | |
667 | =pod |
668 | |
1d68af04 |
669 | =head1 NAME |
94b19069 |
670 | |
671 | Class::MOP - A Meta Object Protocol for Perl 5 |
672 | |
5b60bf98 |
673 | =head1 DESCRIPTION |
94b19069 |
674 | |
127d39a7 |
675 | This module is a fully functioning meta object protocol for the |
1d68af04 |
676 | Perl 5 object system. It makes no attempt to change the behavior or |
677 | characteristics of the Perl 5 object system, only to create a |
27e31eaf |
678 | protocol for its manipulation and introspection. |
94b19069 |
679 | |
828ecf13 |
680 | That said, it does attempt to create the tools for building a rich set |
681 | of extensions to the Perl 5 object system. Every attempt has been made |
682 | to abide by the spirit of the Perl 5 object system that we all know |
683 | and love. |
94b19069 |
684 | |
828ecf13 |
685 | This documentation is sparse on conceptual details. We suggest looking |
686 | at the items listed in the L<SEE ALSO> section for more |
687 | information. In particular the book "The Art of the Meta Object |
688 | Protocol" was very influential in the development of this system. |
40483095 |
689 | |
bfe4d0fc |
690 | =head2 What is a Meta Object Protocol? |
691 | |
1d68af04 |
692 | A meta object protocol is an API to an object system. |
bfe4d0fc |
693 | |
828ecf13 |
694 | To be more specific, it abstracts the components of an object system |
695 | (classes, object, methods, object attributes, etc.). These |
696 | abstractions can then be used to inspect and manipulate the object |
697 | system which they describe. |
bfe4d0fc |
698 | |
1d68af04 |
699 | It can be said that there are two MOPs for any object system; the |
828ecf13 |
700 | implicit MOP and the explicit MOP. The implicit MOP handles things |
1d68af04 |
701 | like method dispatch or inheritance, which happen automatically as |
702 | part of how the object system works. The explicit MOP typically |
703 | handles the introspection/reflection features of the object system. |
bfe4d0fc |
704 | |
828ecf13 |
705 | All object systems have implicit MOPs. Without one, they would not |
5b60bf98 |
706 | work. Explicit MOPs are much less common, and depending on the |
707 | language can vary from restrictive (Reflection in Java or C#) to wide |
708 | open (CLOS is a perfect example). |
e16da3e6 |
709 | |
828ecf13 |
710 | =head2 Yet Another Class Builder! Why? |
711 | |
712 | This is B<not> a class builder so much as a I<class builder |
713 | B<builder>>. The intent is that an end user will not use this module |
714 | directly, but instead this module is used by module authors to build |
715 | extensions and features onto the Perl 5 object system. |
716 | |
717 | This system is used by L<Moose>, which supplies a powerful class |
718 | builder system built entirely on top of C<Class::MOP>. |
e16da3e6 |
719 | |
94b19069 |
720 | =head2 Who is this module for? |
721 | |
828ecf13 |
722 | This module is for anyone who has ever created or wanted to create a |
723 | module for the Class:: namespace. The tools which this module provides |
724 | make doing complex Perl 5 wizardry simpler, by removing such barriers |
725 | as the need to hack symbol tables, or understand the fine details of |
726 | method dispatch. |
94b19069 |
727 | |
bfe4d0fc |
728 | =head2 What changes do I have to make to use this module? |
729 | |
828ecf13 |
730 | This module was designed to be as unintrusive as possible. Many of its |
5b60bf98 |
731 | features are accessible without B<any> change to your existing |
828ecf13 |
732 | code. It is meant to be a compliment to your existing code and not an |
733 | intrusion on your code base. Unlike many other B<Class::> modules, |
734 | this module B<does not> require you subclass it, or even that you |
735 | C<use> it in within your module's package. |
bfe4d0fc |
736 | |
1d68af04 |
737 | The only features which requires additions to your code are the |
2eb717d5 |
738 | attribute handling and instance construction features, and these are |
1d68af04 |
739 | both completely optional features. The only reason for this is because |
740 | Perl 5's object system does not actually have these features built |
2eb717d5 |
741 | in. More information about this feature can be found below. |
bfe4d0fc |
742 | |
828ecf13 |
743 | =head2 About Performance |
744 | |
5b60bf98 |
745 | It is a common misconception that explicit MOPs are a performance hit. |
828ecf13 |
746 | This is not a universal truth, it is a side-effect of some specific |
747 | implementations. For instance, using Java reflection is slow because |
748 | the JVM cannot take advantage of any compiler optimizations, and the |
749 | JVM has to deal with much more runtime type information as well. |
bfe4d0fc |
750 | |
828ecf13 |
751 | Reflection in C# is marginally better as it was designed into the |
752 | language and runtime (the CLR). In contrast, CLOS (the Common Lisp |
753 | Object System) was built to support an explicit MOP, and so |
754 | performance is tuned for it. |
1d68af04 |
755 | |
828ecf13 |
756 | This library in particular does its absolute best to avoid putting |
1d68af04 |
757 | B<any> drain at all upon your code's performance. In fact, by itself |
828ecf13 |
758 | it does nothing to affect your existing code. So you only pay for what |
759 | you actually use. |
bfe4d0fc |
760 | |
550d56db |
761 | =head2 About Metaclass compatibility |
762 | |
1d68af04 |
763 | This module makes sure that all metaclasses created are both upwards |
764 | and downwards compatible. The topic of metaclass compatibility is |
765 | highly esoteric and is something only encountered when doing deep and |
766 | involved metaclass hacking. There are two basic kinds of metaclass |
767 | incompatibility; upwards and downwards. |
550d56db |
768 | |
1d68af04 |
769 | Upwards metaclass compatibility means that the metaclass of a |
770 | given class is either the same as (or a subclass of) all of the |
550d56db |
771 | class's ancestors. |
772 | |
1d68af04 |
773 | Downward metaclass compatibility means that the metaclasses of a |
828ecf13 |
774 | given class's ancestors are all either the same as (or a subclass |
550d56db |
775 | of) that metaclass. |
776 | |
1d68af04 |
777 | Here is a diagram showing a set of two classes (C<A> and C<B>) and |
778 | two metaclasses (C<Meta::A> and C<Meta::B>) which have correct |
550d56db |
779 | metaclass compatibility both upwards and downwards. |
780 | |
781 | +---------+ +---------+ |
782 | | Meta::A |<----| Meta::B | <....... (instance of ) |
1d68af04 |
783 | +---------+ +---------+ <------- (inherits from) |
550d56db |
784 | ^ ^ |
785 | : : |
786 | +---------+ +---------+ |
787 | | A |<----| B | |
788 | +---------+ +---------+ |
789 | |
1d68af04 |
790 | As I said this is a highly esoteric topic and one you will only run |
828ecf13 |
791 | into if you do a lot of subclassing of L<Class::MOP::Class>. If you |
792 | are interested in why this is an issue see the paper I<Uniform and |
793 | safe metaclass composition> linked to in the L<SEE ALSO> section of |
794 | this document. |
550d56db |
795 | |
aa448b16 |
796 | =head2 Using custom metaclasses |
797 | |
828ecf13 |
798 | Always use the L<metaclass> pragma when using a custom metaclass, this |
5b60bf98 |
799 | will ensure the proper initialization order and not accidentally |
800 | create an incorrect type of metaclass for you. This is a very rare |
801 | problem, and one which can only occur if you are doing deep metaclass |
aa448b16 |
802 | programming. So in other words, don't worry about it. |
803 | |
828ecf13 |
804 | Note that if you're using L<Moose> we encourage you to I<not> use |
805 | L<metaclass> pragma, and instead use L<Moose::Util::MetaRole> to apply |
806 | roles to a class's metaclasses. This topic is covered at length in |
807 | various L<Moose::Cookbook> recipes. |
808 | |
94b19069 |
809 | =head1 PROTOCOLS |
810 | |
828ecf13 |
811 | The meta-object protocol is divided into 4 main sub-protocols: |
94b19069 |
812 | |
828ecf13 |
813 | =head2 The Class protocol |
94b19069 |
814 | |
1d68af04 |
815 | This provides a means of manipulating and introspecting a Perl 5 |
828ecf13 |
816 | class. It handles symbol table hacking for you, and provides a rich |
817 | set of methods that go beyond simple package introspection. |
94b19069 |
818 | |
552e3d24 |
819 | See L<Class::MOP::Class> for more details. |
820 | |
828ecf13 |
821 | =head2 The Attribute protocol |
94b19069 |
822 | |
828ecf13 |
823 | This provides a consistent representation for an attribute of a Perl 5 |
824 | class. Since there are so many ways to create and handle attributes in |
825 | Perl 5 OO, the Attribute protocol provide as much of a unified |
826 | approach as possible. Of course, you are always free to extend this |
827 | protocol by subclassing the appropriate classes. |
94b19069 |
828 | |
552e3d24 |
829 | See L<Class::MOP::Attribute> for more details. |
830 | |
828ecf13 |
831 | =head2 The Method protocol |
94b19069 |
832 | |
828ecf13 |
833 | This provides a means of manipulating and introspecting methods in the |
834 | Perl 5 object system. As with attributes, there are many ways to |
1d68af04 |
835 | approach this topic, so we try to keep it pretty basic, while still |
94b19069 |
836 | making it possible to extend the system in many ways. |
837 | |
552e3d24 |
838 | See L<Class::MOP::Method> for more details. |
94b19069 |
839 | |
828ecf13 |
840 | =head2 The Instance protocol |
127d39a7 |
841 | |
828ecf13 |
842 | This provides a layer of abstraction for creating object instances. |
843 | Since the other layers use this protocol, it is relatively easy to |
844 | change the type of your instances from the default hash reference to |
845 | some other type of reference. Several examples are provided in the |
846 | F<examples/> directory included in this distribution. |
127d39a7 |
847 | |
848 | See L<Class::MOP::Instance> for more details. |
849 | |
be7677c7 |
850 | =head1 FUNCTIONS |
851 | |
828ecf13 |
852 | Note that this module does not export any constants or functions. |
853 | |
c1d5345a |
854 | =head2 Constants |
855 | |
856 | =over 4 |
857 | |
828ecf13 |
858 | =item I<Class::MOP::IS_RUNNING_ON_5_10> |
c1d5345a |
859 | |
828ecf13 |
860 | We set this constant depending on what version perl we are on, this |
861 | allows us to take advantage of new 5.10 features and stay backwards |
5b60bf98 |
862 | compatible. |
c1d5345a |
863 | |
828ecf13 |
864 | =item I<Class::MOP::HAVE_ISAREV> |
9efe16ca |
865 | |
5b60bf98 |
866 | Whether or not the L<mro> pragma provides C<get_isarev>, a much faster |
828ecf13 |
867 | way to get all the subclasses of a certain class. |
9efe16ca |
868 | |
c1d5345a |
869 | =back |
870 | |
448b6e55 |
871 | =head2 Utility functions |
872 | |
bd07fbdb |
873 | Note that these are all called as B<functions, not methods>. |
081a927b |
874 | |
448b6e55 |
875 | =over 4 |
876 | |
828ecf13 |
877 | =item B<Class::MOP::load_class($class_name)> |
448b6e55 |
878 | |
828ecf13 |
879 | This will load the specified C<$class_name>. This function can be used |
880 | in place of tricks like C<eval "use $module"> or using C<require> |
01f3a099 |
881 | unconditionally. This will return the metaclass of C<$class_name>. |
448b6e55 |
882 | |
828ecf13 |
883 | =item B<Class::MOP::is_class_loaded($class_name)> |
448b6e55 |
884 | |
15ab5451 |
885 | Returns a boolean indicating whether or not C<$class_name> has been |
886 | loaded. |
448b6e55 |
887 | |
828ecf13 |
888 | This does a basic check of the symbol table to try and determine as |
889 | best it can if the C<$class_name> is loaded, it is probably correct |
890 | about 99% of the time, but it can be fooled into reporting false |
891 | positives. |
448b6e55 |
892 | |
cdac22cc |
893 | =item B<Class::MOP::get_code_info($code)> |
894 | |
895 | This function returns two values, the name of the package the C<$code> |
896 | is from and the name of the C<$code> itself. This is used by several |
5b60bf98 |
897 | elements of the MOP to determine where a given C<$code> reference is |
cdac22cc |
898 | from. |
899 | |
44ba77a3 |
900 | =item B<Class::MOP::class_of($instance_or_class_name)> |
901 | |
902 | This will return the metaclass of the given instance or class name. |
903 | Even if the class lacks a metaclass, no metaclass will be initialized |
904 | and C<undef> will be returned. |
905 | |
828ecf13 |
906 | =item B<Class::MOP::check_package_cache_flag($pkg)> |
e0e4674a |
907 | |
bd07fbdb |
908 | B<NOTE: DO NOT USE THIS FUNCTION, IT IS FOR INTERNAL USE ONLY!> |
909 | |
828ecf13 |
910 | This will return an integer that is managed by L<Class::MOP::Class> to |
911 | determine if a module's symbol table has been altered. |
127d39a7 |
912 | |
828ecf13 |
913 | In Perl 5.10 or greater, this flag is package specific. However in |
914 | versions prior to 5.10, this will use the C<PL_sub_generation> |
915 | variable which is not package specific. |
127d39a7 |
916 | |
828ecf13 |
917 | =item B<Class::MOP::load_first_existing_class(@class_names)> |
063ad0c5 |
918 | |
919 | B<NOTE: DO NOT USE THIS FUNCTION, IT IS FOR INTERNAL USE ONLY!> |
920 | |
921 | Given a list of class names, this function will attempt to load each |
922 | one in turn. |
923 | |
828ecf13 |
924 | If it finds a class it can load, it will return that class' name. If |
925 | none of the classes can be loaded, it will throw an exception. |
063ad0c5 |
926 | |
448b6e55 |
927 | =back |
928 | |
929 | =head2 Metaclass cache functions |
930 | |
6c842677 |
931 | Class::MOP holds a cache of metaclasses. The following are functions |
1d68af04 |
932 | (B<not methods>) which can be used to access that cache. It is not |
6c842677 |
933 | recommended that you mess with these. Bad things could happen, but if |
934 | you are brave and willing to risk it: go for it! |
be7677c7 |
935 | |
936 | =over 4 |
937 | |
828ecf13 |
938 | =item B<Class::MOP::get_all_metaclasses> |
be7677c7 |
939 | |
6c842677 |
940 | This will return a hash of all the metaclass instances that have |
828ecf13 |
941 | been cached by L<Class::MOP::Class>, keyed by the package name. |
b9d9fc0b |
942 | |
828ecf13 |
943 | =item B<Class::MOP::get_all_metaclass_instances> |
be7677c7 |
944 | |
6c842677 |
945 | This will return a list of all the metaclass instances that have |
828ecf13 |
946 | been cached by L<Class::MOP::Class>. |
b9d9fc0b |
947 | |
828ecf13 |
948 | =item B<Class::MOP::get_all_metaclass_names> |
be7677c7 |
949 | |
6c842677 |
950 | This will return a list of all the metaclass names that have |
828ecf13 |
951 | been cached by L<Class::MOP::Class>. |
b9d9fc0b |
952 | |
828ecf13 |
953 | =item B<Class::MOP::get_metaclass_by_name($name)> |
be7677c7 |
954 | |
828ecf13 |
955 | This will return a cached L<Class::MOP::Class> instance, or nothing |
6c842677 |
956 | if no metaclass exists with that C<$name>. |
127d39a7 |
957 | |
828ecf13 |
958 | =item B<Class::MOP::store_metaclass_by_name($name, $meta)> |
be7677c7 |
959 | |
127d39a7 |
960 | This will store a metaclass in the cache at the supplied C<$key>. |
961 | |
828ecf13 |
962 | =item B<Class::MOP::weaken_metaclass($name)> |
be7677c7 |
963 | |
6c842677 |
964 | In rare cases (e.g. anonymous metaclasses) it is desirable to |
965 | store a weakened reference in the metaclass cache. This |
966 | function will weaken the reference to the metaclass stored |
967 | in C<$name>. |
127d39a7 |
968 | |
828ecf13 |
969 | =item B<Class::MOP::does_metaclass_exist($name)> |
be7677c7 |
970 | |
828ecf13 |
971 | This will return true of there exists a metaclass stored in the |
6c842677 |
972 | C<$name> key, and return false otherwise. |
127d39a7 |
973 | |
828ecf13 |
974 | =item B<Class::MOP::remove_metaclass_by_name($name)> |
be7677c7 |
975 | |
6c842677 |
976 | This will remove the metaclass stored in the C<$name> key. |
127d39a7 |
977 | |
be7677c7 |
978 | =back |
979 | |
552e3d24 |
980 | =head1 SEE ALSO |
8b978dd5 |
981 | |
552e3d24 |
982 | =head2 Books |
8b978dd5 |
983 | |
1d68af04 |
984 | There are very few books out on Meta Object Protocols and Metaclasses |
985 | because it is such an esoteric topic. The following books are really |
986 | the only ones I have found. If you know of any more, B<I<please>> |
a2e85e6c |
987 | email me and let me know, I would love to hear about them. |
988 | |
8b978dd5 |
989 | =over 4 |
990 | |
15ab5451 |
991 | =item I<The Art of the Meta Object Protocol> |
8b978dd5 |
992 | |
15ab5451 |
993 | =item I<Advances in Object-Oriented Metalevel Architecture and Reflection> |
8b978dd5 |
994 | |
15ab5451 |
995 | =item I<Putting MetaClasses to Work> |
b51af7f9 |
996 | |
15ab5451 |
997 | =item I<Smalltalk: The Language> |
a2e85e6c |
998 | |
94b19069 |
999 | =back |
1000 | |
550d56db |
1001 | =head2 Papers |
1002 | |
1003 | =over 4 |
1004 | |
15ab5451 |
1005 | =item "Uniform and safe metaclass composition" |
550d56db |
1006 | |
1d68af04 |
1007 | An excellent paper by the people who brought us the original Traits paper. |
1008 | This paper is on how Traits can be used to do safe metaclass composition, |
1009 | and offers an excellent introduction section which delves into the topic of |
550d56db |
1010 | metaclass compatibility. |
1011 | |
1012 | L<http://www.iam.unibe.ch/~scg/Archive/Papers/Duca05ySafeMetaclassTrait.pdf> |
1013 | |
15ab5451 |
1014 | =item "Safe Metaclass Programming" |
550d56db |
1015 | |
1d68af04 |
1016 | This paper seems to precede the above paper, and propose a mix-in based |
1017 | approach as opposed to the Traits based approach. Both papers have similar |
1018 | information on the metaclass compatibility problem space. |
550d56db |
1019 | |
1020 | L<http://citeseer.ist.psu.edu/37617.html> |
1021 | |
1022 | =back |
1023 | |
552e3d24 |
1024 | =head2 Prior Art |
8b978dd5 |
1025 | |
1026 | =over 4 |
1027 | |
7184ca14 |
1028 | =item The Perl 6 MetaModel work in the Pugs project |
8b978dd5 |
1029 | |
1030 | =over 4 |
1031 | |
552e3d24 |
1032 | =item L<http://svn.openfoundry.org/pugs/perl5/Perl6-MetaModel> |
8b978dd5 |
1033 | |
552e3d24 |
1034 | =item L<http://svn.openfoundry.org/pugs/perl5/Perl6-ObjectSpace> |
8b978dd5 |
1035 | |
1036 | =back |
1037 | |
94b19069 |
1038 | =back |
1039 | |
1d68af04 |
1040 | =head2 Articles |
f8dfcfb7 |
1041 | |
1042 | =over 4 |
1043 | |
1d68af04 |
1044 | =item CPAN Module Review of Class::MOP |
f8dfcfb7 |
1045 | |
1046 | L<http://www.oreillynet.com/onlamp/blog/2006/06/cpan_module_review_classmop.html> |
1047 | |
1048 | =back |
1049 | |
a2e85e6c |
1050 | =head1 SIMILAR MODULES |
1051 | |
1d68af04 |
1052 | As I have said above, this module is a class-builder-builder, so it is |
1053 | not the same thing as modules like L<Class::Accessor> and |
1054 | L<Class::MethodMaker>. That being said there are very few modules on CPAN |
1055 | with similar goals to this module. The one I have found which is most |
1056 | like this module is L<Class::Meta>, although it's philosophy and the MOP it |
1057 | creates are very different from this modules. |
94b19069 |
1058 | |
a2e85e6c |
1059 | =head1 BUGS |
1060 | |
1d68af04 |
1061 | All complex software has bugs lurking in it, and this module is no |
a2e85e6c |
1062 | exception. If you find a bug please either email me, or add the bug |
1063 | to cpan-RT. |
1064 | |
1065 | =head1 ACKNOWLEDGEMENTS |
1066 | |
1067 | =over 4 |
1068 | |
b9d9fc0b |
1069 | =item Rob Kinyon |
a2e85e6c |
1070 | |
1d68af04 |
1071 | Thanks to Rob for actually getting the development of this module kick-started. |
a2e85e6c |
1072 | |
1073 | =back |
1074 | |
1a09d9cc |
1075 | =head1 AUTHORS |
94b19069 |
1076 | |
a2e85e6c |
1077 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
552e3d24 |
1078 | |
9c8cda90 |
1079 | B<with contributions from:> |
1080 | |
1081 | Brandon (blblack) Black |
1082 | |
4f116037 |
1083 | Florian (rafl) Ragwitz |
1084 | |
9c8cda90 |
1085 | Guillermo (groditi) Roditi |
1086 | |
9195ddff |
1087 | Matt (mst) Trout |
1088 | |
9c8cda90 |
1089 | Rob (robkinyon) Kinyon |
1090 | |
1091 | Yuval (nothingmuch) Kogman |
1a09d9cc |
1092 | |
f430cfa4 |
1093 | Scott (konobi) McWhirter |
1094 | |
94b19069 |
1095 | =head1 COPYRIGHT AND LICENSE |
1096 | |
070bb6c9 |
1097 | Copyright 2006-2009 by Infinity Interactive, Inc. |
94b19069 |
1098 | |
1099 | L<http://www.iinteractive.com> |
1100 | |
1101 | This library is free software; you can redistribute it and/or modify |
1d68af04 |
1102 | it under the same terms as Perl itself. |
94b19069 |
1103 | |
1104 | =cut |