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 { |
c7e28c19 |
23 | *IS_RUNNING_ON_5_10 = ($] < 5.009_005) |
11b56828 |
24 | ? sub () { 0 } |
c7e28c19 |
25 | : sub () { 1 }; |
46b23b44 |
26 | |
f9bd8fe2 |
27 | sub HAVE_ISAREV () { |
c7e28c19 |
28 | Carp::cluck("Class::MOP::HAVE_ISAREV is deprecated and will be removed in a future release. It has always returned 1 anyway."); |
f9bd8fe2 |
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 | |
c6e75cb3 |
36 | our $VERSION = '0.81'; |
8a7085c1 |
37 | our $XS_VERSION = $VERSION; |
d519662a |
38 | $VERSION = eval $VERSION; |
c7e28c19 |
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 { |
82999986 |
65 | return unless defined $_[0]; |
86866fb5 |
66 | my $class = blessed($_[0]) || $_[0]; |
67 | return $METAS{$class}; |
68 | } |
69 | |
be7677c7 |
70 | # NOTE: |
1d68af04 |
71 | # We only cache metaclasses, meaning instances of |
72 | # Class::MOP::Class. We do not cache instance of |
be7677c7 |
73 | # Class::MOP::Package or Class::MOP::Module. Mostly |
1d68af04 |
74 | # because I don't yet see a good reason to do so. |
be7677c7 |
75 | } |
76 | |
44da14be |
77 | sub _class_to_pmfile { |
78 | my $class = shift; |
79 | |
80 | my $file = $class . '.pm'; |
81 | $file =~ s{::}{/}g; |
82 | |
83 | return $file; |
84 | } |
85 | |
063ad0c5 |
86 | sub load_first_existing_class { |
f280f05c |
87 | my @classes = @_ |
88 | or return; |
5a24cf8a |
89 | |
90 | foreach my $class (@classes) { |
91 | unless ( _is_valid_class_name($class) ) { |
92 | my $display = defined($class) ? $class : 'undef'; |
93 | confess "Invalid class name ($display)"; |
94 | } |
ab5e2f48 |
95 | } |
96 | |
063ad0c5 |
97 | my $found; |
5a24cf8a |
98 | my %exceptions; |
063ad0c5 |
99 | for my $class (@classes) { |
44da14be |
100 | my $pmfile = _class_to_pmfile($class); |
063ad0c5 |
101 | my $e = _try_load_one_class($class); |
102 | |
5a24cf8a |
103 | if ($e) { |
063ad0c5 |
104 | $exceptions{$class} = $e; |
44da14be |
105 | last if $e !~ /^Can't locate \Q$pmfile\E in \@INC/; |
5a24cf8a |
106 | } |
107 | else { |
063ad0c5 |
108 | $found = $class; |
109 | last; |
5a24cf8a |
110 | } |
063ad0c5 |
111 | } |
5a24cf8a |
112 | |
1d8153bd |
113 | return $found if $found; |
07940968 |
114 | |
063ad0c5 |
115 | confess join( |
116 | "\n", |
117 | map { |
118 | sprintf( |
fea44045 |
119 | "Could not load class (%s) because : %s", $_, |
063ad0c5 |
120 | $exceptions{$_} |
121 | ) |
44da14be |
122 | } |
123 | grep { |
124 | exists $exceptions{$_} |
063ad0c5 |
125 | } @classes |
f280f05c |
126 | ); |
5a24cf8a |
127 | } |
128 | |
063ad0c5 |
129 | sub _try_load_one_class { |
130 | my $class = shift; |
131 | |
132 | return if is_class_loaded($class); |
2beec805 |
133 | |
44da14be |
134 | my $file = _class_to_pmfile($class); |
063ad0c5 |
135 | |
136 | return do { |
137 | local $@; |
138 | eval { require($file) }; |
139 | $@; |
140 | }; |
141 | } |
142 | |
5a24cf8a |
143 | sub load_class { |
1d8153bd |
144 | my $class = load_first_existing_class($_[0]); |
145 | return get_metaclass_by_name($class) || $class; |
448b6e55 |
146 | } |
147 | |
2c0fb064 |
148 | sub _is_valid_class_name { |
149 | my $class = shift; |
150 | |
151 | return 0 if ref($class); |
152 | return 0 unless defined($class); |
153 | return 0 unless length($class); |
154 | |
155 | return 1 if $class =~ /^\w+(?:::\w+)*$/; |
156 | |
157 | return 0; |
158 | } |
159 | |
aa448b16 |
160 | ## ---------------------------------------------------------------------------- |
161 | ## Setting up our environment ... |
162 | ## ---------------------------------------------------------------------------- |
1d68af04 |
163 | ## Class::MOP needs to have a few things in the global perl environment so |
aa448b16 |
164 | ## that it can operate effectively. Those things are done here. |
165 | ## ---------------------------------------------------------------------------- |
166 | |
3bf7644b |
167 | # ... nothing yet actually ;) |
8b978dd5 |
168 | |
b51af7f9 |
169 | ## ---------------------------------------------------------------------------- |
1d68af04 |
170 | ## Bootstrapping |
b51af7f9 |
171 | ## ---------------------------------------------------------------------------- |
1d68af04 |
172 | ## The code below here is to bootstrap our MOP with itself. This is also |
b51af7f9 |
173 | ## sometimes called "tying the knot". By doing this, we make it much easier |
174 | ## to extend the MOP through subclassing and such since now you can use the |
1d68af04 |
175 | ## MOP itself to extend itself. |
176 | ## |
b51af7f9 |
177 | ## Yes, I know, thats weird and insane, but it's a good thing, trust me :) |
1d68af04 |
178 | ## ---------------------------------------------------------------------------- |
727919c5 |
179 | |
1d68af04 |
180 | # We need to add in the meta-attributes here so that |
181 | # any subclass of Class::MOP::* will be able to |
c2b256bc |
182 | # inherit them using _construct_instance |
727919c5 |
183 | |
f0480c45 |
184 | ## -------------------------------------------------------- |
6d5355c3 |
185 | ## Class::MOP::Package |
727919c5 |
186 | |
6d5355c3 |
187 | Class::MOP::Package->meta->add_attribute( |
8683db0e |
188 | Class::MOP::Attribute->new('package' => ( |
b880e0de |
189 | reader => { |
1d68af04 |
190 | # NOTE: we need to do this in order |
191 | # for the instance meta-object to |
b880e0de |
192 | # not fall into meta-circular death |
1d68af04 |
193 | # |
ce2ae40f |
194 | # we just alias the original method |
1d68af04 |
195 | # rather than re-produce it here |
ce2ae40f |
196 | 'name' => \&Class::MOP::Package::name |
b880e0de |
197 | }, |
727919c5 |
198 | )) |
199 | ); |
200 | |
a5e51f0b |
201 | Class::MOP::Package->meta->add_attribute( |
8683db0e |
202 | Class::MOP::Attribute->new('namespace' => ( |
a5e51f0b |
203 | reader => { |
56dcfc1a |
204 | # NOTE: |
ce2ae40f |
205 | # we just alias the original method |
206 | # rather than re-produce it here |
207 | 'namespace' => \&Class::MOP::Package::namespace |
a5e51f0b |
208 | }, |
2e877f58 |
209 | init_arg => undef, |
c4260b45 |
210 | default => sub { \undef } |
a5e51f0b |
211 | )) |
212 | ); |
213 | |
f0480c45 |
214 | ## -------------------------------------------------------- |
215 | ## Class::MOP::Module |
216 | |
217 | # NOTE: |
1d68af04 |
218 | # yeah this is kind of stretching things a bit, |
f0480c45 |
219 | # but truthfully the version should be an attribute |
1d68af04 |
220 | # of the Module, the weirdness comes from having to |
221 | # stick to Perl 5 convention and store it in the |
222 | # $VERSION package variable. Basically if you just |
223 | # squint at it, it will look how you want it to look. |
f0480c45 |
224 | # Either as a package variable, or as a attribute of |
225 | # the metaclass, isn't abstraction great :) |
226 | |
227 | Class::MOP::Module->meta->add_attribute( |
8683db0e |
228 | Class::MOP::Attribute->new('version' => ( |
f0480c45 |
229 | reader => { |
ce2ae40f |
230 | # NOTE: |
231 | # we just alias the original method |
1d68af04 |
232 | # rather than re-produce it here |
ce2ae40f |
233 | 'version' => \&Class::MOP::Module::version |
f0480c45 |
234 | }, |
2e877f58 |
235 | init_arg => undef, |
c4260b45 |
236 | default => sub { \undef } |
f0480c45 |
237 | )) |
238 | ); |
239 | |
240 | # NOTE: |
1d68af04 |
241 | # By following the same conventions as version here, |
242 | # we are opening up the possibility that people can |
243 | # use the $AUTHORITY in non-Class::MOP modules as |
244 | # well. |
f0480c45 |
245 | |
246 | Class::MOP::Module->meta->add_attribute( |
8683db0e |
247 | Class::MOP::Attribute->new('authority' => ( |
f0480c45 |
248 | reader => { |
ce2ae40f |
249 | # NOTE: |
250 | # we just alias the original method |
1d68af04 |
251 | # rather than re-produce it here |
ce2ae40f |
252 | 'authority' => \&Class::MOP::Module::authority |
1d68af04 |
253 | }, |
2e877f58 |
254 | init_arg => undef, |
c4260b45 |
255 | default => sub { \undef } |
f0480c45 |
256 | )) |
257 | ); |
258 | |
259 | ## -------------------------------------------------------- |
6d5355c3 |
260 | ## Class::MOP::Class |
261 | |
727919c5 |
262 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
263 | Class::MOP::Attribute->new('attributes' => ( |
f7259199 |
264 | reader => { |
1d68af04 |
265 | # NOTE: we need to do this in order |
266 | # for the instance meta-object to |
267 | # not fall into meta-circular death |
268 | # |
ce2ae40f |
269 | # we just alias the original method |
1d68af04 |
270 | # rather than re-produce it here |
ce2ae40f |
271 | 'get_attribute_map' => \&Class::MOP::Class::get_attribute_map |
f7259199 |
272 | }, |
727919c5 |
273 | default => sub { {} } |
274 | )) |
275 | ); |
276 | |
351bd7d4 |
277 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
278 | Class::MOP::Attribute->new('methods' => ( |
1d68af04 |
279 | reader => { |
ce2ae40f |
280 | # NOTE: |
281 | # we just alias the original method |
1d68af04 |
282 | # rather than re-produce it here |
ce2ae40f |
283 | 'get_method_map' => \&Class::MOP::Class::get_method_map |
92330ee2 |
284 | }, |
7855ddba |
285 | default => sub { {} } |
c4260b45 |
286 | )) |
287 | ); |
288 | |
289 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
290 | Class::MOP::Attribute->new('superclasses' => ( |
c23184fc |
291 | accessor => { |
292 | # NOTE: |
293 | # we just alias the original method |
1d68af04 |
294 | # rather than re-produce it here |
c23184fc |
295 | 'superclasses' => \&Class::MOP::Class::superclasses |
296 | }, |
2e877f58 |
297 | init_arg => undef, |
c23184fc |
298 | default => sub { \undef } |
299 | )) |
300 | ); |
301 | |
302 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
303 | Class::MOP::Attribute->new('attribute_metaclass' => ( |
1d68af04 |
304 | reader => { |
6d2118a4 |
305 | # NOTE: |
306 | # we just alias the original method |
1d68af04 |
307 | # rather than re-produce it here |
6d2118a4 |
308 | 'attribute_metaclass' => \&Class::MOP::Class::attribute_metaclass |
1d68af04 |
309 | }, |
351bd7d4 |
310 | default => 'Class::MOP::Attribute', |
311 | )) |
312 | ); |
313 | |
314 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
315 | Class::MOP::Attribute->new('method_metaclass' => ( |
1d68af04 |
316 | reader => { |
6d2118a4 |
317 | # NOTE: |
318 | # we just alias the original method |
1d68af04 |
319 | # rather than re-produce it here |
6d2118a4 |
320 | 'method_metaclass' => \&Class::MOP::Class::method_metaclass |
321 | }, |
1d68af04 |
322 | default => 'Class::MOP::Method', |
351bd7d4 |
323 | )) |
324 | ); |
325 | |
2bab2be6 |
326 | Class::MOP::Class->meta->add_attribute( |
77373da8 |
327 | Class::MOP::Attribute->new('wrapped_method_metaclass' => ( |
328 | reader => { |
329 | # NOTE: |
330 | # we just alias the original method |
331 | # rather than re-produce it here |
332 | 'wrapped_method_metaclass' => \&Class::MOP::Class::wrapped_method_metaclass |
333 | }, |
334 | default => 'Class::MOP::Method::Wrapped', |
335 | )) |
336 | ); |
337 | |
338 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
339 | Class::MOP::Attribute->new('instance_metaclass' => ( |
b880e0de |
340 | reader => { |
1d68af04 |
341 | # NOTE: we need to do this in order |
342 | # for the instance meta-object to |
343 | # not fall into meta-circular death |
344 | # |
ce2ae40f |
345 | # we just alias the original method |
1d68af04 |
346 | # rather than re-produce it here |
ce2ae40f |
347 | 'instance_metaclass' => \&Class::MOP::Class::instance_metaclass |
b880e0de |
348 | }, |
1d68af04 |
349 | default => 'Class::MOP::Instance', |
2bab2be6 |
350 | )) |
351 | ); |
352 | |
44d6ea77 |
353 | Class::MOP::Class->meta->add_attribute( |
354 | Class::MOP::Attribute->new('immutable_transformer' => ( |
355 | reader => { |
356 | 'immutable_transformer' => \&Class::MOP::Class::immutable_transformer |
357 | }, |
358 | writer => { |
359 | '_set_immutable_transformer' => \&Class::MOP::Class::_set_immutable_transformer |
360 | }, |
361 | )) |
362 | ); |
363 | |
9d6dce77 |
364 | # NOTE: |
1d68af04 |
365 | # we don't actually need to tie the knot with |
366 | # Class::MOP::Class here, it is actually handled |
367 | # within Class::MOP::Class itself in the |
c2b256bc |
368 | # _construct_class_instance method. |
9d6dce77 |
369 | |
f0480c45 |
370 | ## -------------------------------------------------------- |
727919c5 |
371 | ## Class::MOP::Attribute |
372 | |
7b31baf4 |
373 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
374 | Class::MOP::Attribute->new('name' => ( |
c23184fc |
375 | reader => { |
1d68af04 |
376 | # NOTE: we need to do this in order |
377 | # for the instance meta-object to |
378 | # not fall into meta-circular death |
379 | # |
ce2ae40f |
380 | # we just alias the original method |
1d68af04 |
381 | # rather than re-produce it here |
ce2ae40f |
382 | 'name' => \&Class::MOP::Attribute::name |
b880e0de |
383 | } |
7b31baf4 |
384 | )) |
385 | ); |
386 | |
387 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
388 | Class::MOP::Attribute->new('associated_class' => ( |
c23184fc |
389 | reader => { |
1d68af04 |
390 | # NOTE: we need to do this in order |
391 | # for the instance meta-object to |
392 | # not fall into meta-circular death |
393 | # |
ce2ae40f |
394 | # we just alias the original method |
1d68af04 |
395 | # rather than re-produce it here |
ce2ae40f |
396 | 'associated_class' => \&Class::MOP::Attribute::associated_class |
b880e0de |
397 | } |
7b31baf4 |
398 | )) |
399 | ); |
400 | |
401 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
402 | Class::MOP::Attribute->new('accessor' => ( |
6d2118a4 |
403 | reader => { 'accessor' => \&Class::MOP::Attribute::accessor }, |
404 | predicate => { 'has_accessor' => \&Class::MOP::Attribute::has_accessor }, |
7b31baf4 |
405 | )) |
406 | ); |
407 | |
408 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
409 | Class::MOP::Attribute->new('reader' => ( |
6d2118a4 |
410 | reader => { 'reader' => \&Class::MOP::Attribute::reader }, |
411 | predicate => { 'has_reader' => \&Class::MOP::Attribute::has_reader }, |
7b31baf4 |
412 | )) |
413 | ); |
414 | |
415 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
416 | Class::MOP::Attribute->new('initializer' => ( |
8ee74136 |
417 | reader => { 'initializer' => \&Class::MOP::Attribute::initializer }, |
418 | predicate => { 'has_initializer' => \&Class::MOP::Attribute::has_initializer }, |
0ab65f99 |
419 | )) |
420 | ); |
421 | |
422 | Class::MOP::Attribute->meta->add_attribute( |
d9d99689 |
423 | Class::MOP::Attribute->new('definition_context' => ( |
424 | reader => { 'definition_context' => \&Class::MOP::Attribute::definition_context }, |
425 | )) |
426 | ); |
427 | |
428 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
429 | Class::MOP::Attribute->new('writer' => ( |
6d2118a4 |
430 | reader => { 'writer' => \&Class::MOP::Attribute::writer }, |
431 | predicate => { 'has_writer' => \&Class::MOP::Attribute::has_writer }, |
7b31baf4 |
432 | )) |
433 | ); |
434 | |
435 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
436 | Class::MOP::Attribute->new('predicate' => ( |
6d2118a4 |
437 | reader => { 'predicate' => \&Class::MOP::Attribute::predicate }, |
438 | predicate => { 'has_predicate' => \&Class::MOP::Attribute::has_predicate }, |
7b31baf4 |
439 | )) |
440 | ); |
441 | |
442 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
443 | Class::MOP::Attribute->new('clearer' => ( |
6d2118a4 |
444 | reader => { 'clearer' => \&Class::MOP::Attribute::clearer }, |
445 | predicate => { 'has_clearer' => \&Class::MOP::Attribute::has_clearer }, |
7d28758b |
446 | )) |
447 | ); |
448 | |
449 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
450 | Class::MOP::Attribute->new('builder' => ( |
1d68af04 |
451 | reader => { 'builder' => \&Class::MOP::Attribute::builder }, |
452 | predicate => { 'has_builder' => \&Class::MOP::Attribute::has_builder }, |
453 | )) |
454 | ); |
455 | |
456 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
457 | Class::MOP::Attribute->new('init_arg' => ( |
6d2118a4 |
458 | reader => { 'init_arg' => \&Class::MOP::Attribute::init_arg }, |
459 | predicate => { 'has_init_arg' => \&Class::MOP::Attribute::has_init_arg }, |
7b31baf4 |
460 | )) |
461 | ); |
462 | |
463 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
464 | Class::MOP::Attribute->new('default' => ( |
7b31baf4 |
465 | # default has a custom 'reader' method ... |
1d68af04 |
466 | predicate => { 'has_default' => \&Class::MOP::Attribute::has_default }, |
7b31baf4 |
467 | )) |
468 | ); |
469 | |
3545c727 |
470 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
471 | Class::MOP::Attribute->new('associated_methods' => ( |
c23184fc |
472 | reader => { 'associated_methods' => \&Class::MOP::Attribute::associated_methods }, |
1d68af04 |
473 | default => sub { [] } |
3545c727 |
474 | )) |
475 | ); |
727919c5 |
476 | |
5659d76e |
477 | Class::MOP::Attribute->meta->add_method('clone' => sub { |
a740253a |
478 | my $self = shift; |
1d68af04 |
479 | $self->meta->clone_object($self, @_); |
727919c5 |
480 | }); |
481 | |
f0480c45 |
482 | ## -------------------------------------------------------- |
b6164407 |
483 | ## Class::MOP::Method |
b6164407 |
484 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
485 | Class::MOP::Attribute->new('body' => ( |
c23184fc |
486 | reader => { 'body' => \&Class::MOP::Method::body }, |
b6164407 |
487 | )) |
488 | ); |
489 | |
4c105333 |
490 | Class::MOP::Method->meta->add_attribute( |
5e607260 |
491 | Class::MOP::Attribute->new('associated_metaclass' => ( |
5e607260 |
492 | reader => { 'associated_metaclass' => \&Class::MOP::Method::associated_metaclass }, |
493 | )) |
494 | ); |
495 | |
496 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
497 | Class::MOP::Attribute->new('package_name' => ( |
4c105333 |
498 | reader => { 'package_name' => \&Class::MOP::Method::package_name }, |
499 | )) |
500 | ); |
501 | |
502 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
503 | Class::MOP::Attribute->new('name' => ( |
4c105333 |
504 | reader => { 'name' => \&Class::MOP::Method::name }, |
505 | )) |
506 | ); |
507 | |
2226a8b0 |
508 | Class::MOP::Method->meta->add_attribute( |
509 | Class::MOP::Attribute->new('original_method' => ( |
510 | reader => { 'original_method' => \&Class::MOP::Method::original_method }, |
511 | writer => { '_set_original_method' => \&Class::MOP::Method::_set_original_method }, |
512 | )) |
513 | ); |
514 | |
4c105333 |
515 | Class::MOP::Method->meta->add_method('clone' => sub { |
516 | my $self = shift; |
2226a8b0 |
517 | my $clone = $self->meta->clone_object($self, @_); |
518 | $clone->_set_original_method($self); |
519 | return $clone; |
4c105333 |
520 | }); |
521 | |
b6164407 |
522 | ## -------------------------------------------------------- |
523 | ## Class::MOP::Method::Wrapped |
524 | |
525 | # NOTE: |
1d68af04 |
526 | # the way this item is initialized, this |
527 | # really does not follow the standard |
528 | # practices of attributes, but we put |
b6164407 |
529 | # it here for completeness |
530 | Class::MOP::Method::Wrapped->meta->add_attribute( |
8683db0e |
531 | Class::MOP::Attribute->new('modifier_table') |
b6164407 |
532 | ); |
533 | |
534 | ## -------------------------------------------------------- |
565f0cbb |
535 | ## Class::MOP::Method::Generated |
536 | |
537 | Class::MOP::Method::Generated->meta->add_attribute( |
8683db0e |
538 | Class::MOP::Attribute->new('is_inline' => ( |
565f0cbb |
539 | reader => { 'is_inline' => \&Class::MOP::Method::Generated::is_inline }, |
4c105333 |
540 | default => 0, |
1d68af04 |
541 | )) |
565f0cbb |
542 | ); |
543 | |
d9d99689 |
544 | Class::MOP::Method::Generated->meta->add_attribute( |
545 | Class::MOP::Attribute->new('definition_context' => ( |
546 | reader => { 'definition_context' => \&Class::MOP::Method::Generated::definition_context }, |
547 | )) |
548 | ); |
549 | |
565f0cbb |
550 | ## -------------------------------------------------------- |
d90b42a6 |
551 | ## Class::MOP::Method::Accessor |
552 | |
553 | Class::MOP::Method::Accessor->meta->add_attribute( |
8683db0e |
554 | Class::MOP::Attribute->new('attribute' => ( |
1d68af04 |
555 | reader => { |
556 | 'associated_attribute' => \&Class::MOP::Method::Accessor::associated_attribute |
d90b42a6 |
557 | }, |
1d68af04 |
558 | )) |
d90b42a6 |
559 | ); |
560 | |
561 | Class::MOP::Method::Accessor->meta->add_attribute( |
8683db0e |
562 | Class::MOP::Attribute->new('accessor_type' => ( |
c23184fc |
563 | reader => { 'accessor_type' => \&Class::MOP::Method::Accessor::accessor_type }, |
1d68af04 |
564 | )) |
d90b42a6 |
565 | ); |
566 | |
d90b42a6 |
567 | ## -------------------------------------------------------- |
568 | ## Class::MOP::Method::Constructor |
569 | |
570 | Class::MOP::Method::Constructor->meta->add_attribute( |
8683db0e |
571 | Class::MOP::Attribute->new('options' => ( |
1d68af04 |
572 | reader => { |
573 | 'options' => \&Class::MOP::Method::Constructor::options |
d90b42a6 |
574 | }, |
4c105333 |
575 | default => sub { +{} } |
1d68af04 |
576 | )) |
d90b42a6 |
577 | ); |
578 | |
579 | Class::MOP::Method::Constructor->meta->add_attribute( |
8683db0e |
580 | Class::MOP::Attribute->new('associated_metaclass' => ( |
e8a38403 |
581 | init_arg => "metaclass", # FIXME alias and rename |
1d68af04 |
582 | reader => { |
583 | 'associated_metaclass' => \&Class::MOP::Method::Constructor::associated_metaclass |
584 | }, |
585 | )) |
d90b42a6 |
586 | ); |
587 | |
588 | ## -------------------------------------------------------- |
86482605 |
589 | ## Class::MOP::Instance |
590 | |
591 | # NOTE: |
1d68af04 |
592 | # these don't yet do much of anything, but are just |
86482605 |
593 | # included for completeness |
594 | |
595 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
596 | Class::MOP::Attribute->new('associated_metaclass', |
597 | reader => { associated_metaclass => \&Class::MOP::Instance::associated_metaclass }, |
598 | ), |
86482605 |
599 | ); |
600 | |
601 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
602 | Class::MOP::Attribute->new('_class_name', |
603 | init_arg => undef, |
604 | reader => { _class_name => \&Class::MOP::Instance::_class_name }, |
605 | #lazy => 1, # not yet supported by Class::MOP but out our version does it anyway |
606 | #default => sub { $_[0]->associated_metaclass->name }, |
607 | ), |
608 | ); |
609 | |
610 | Class::MOP::Instance->meta->add_attribute( |
611 | Class::MOP::Attribute->new('attributes', |
0b5d46da |
612 | reader => { attributes => \&Class::MOP::Instance::get_all_attributes }, |
74890687 |
613 | ), |
32bfc810 |
614 | ); |
615 | |
616 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
617 | Class::MOP::Attribute->new('slots', |
618 | reader => { slots => \&Class::MOP::Instance::slots }, |
619 | ), |
86482605 |
620 | ); |
621 | |
63d08a9e |
622 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
623 | Class::MOP::Attribute->new('slot_hash', |
624 | reader => { slot_hash => \&Class::MOP::Instance::slot_hash }, |
625 | ), |
63d08a9e |
626 | ); |
627 | |
628 | |
caa051fa |
629 | # we need the meta instance of the meta instance to be created now, in order |
630 | # for the constructor to be able to use it |
631 | Class::MOP::Instance->meta->get_meta_instance; |
632 | |
caa051fa |
633 | # pretend the add_method never happenned. it hasn't yet affected anything |
634 | undef Class::MOP::Instance->meta->{_package_cache_flag}; |
635 | |
86482605 |
636 | ## -------------------------------------------------------- |
f0480c45 |
637 | ## Now close all the Class::MOP::* classes |
4d47b77f |
638 | |
1aa13cf4 |
639 | # NOTE: we don't need to inline the the accessors this only lengthens |
640 | # the compile time of the MOP, and gives us no actual benefits. |
0b9372a2 |
641 | |
642 | $_->meta->make_immutable( |
6c2f6b5c |
643 | inline_constructor => 1, |
644 | replace_constructor => 1, |
645 | constructor_name => "_new", |
45582002 |
646 | inline_accessors => 0, |
0b9372a2 |
647 | ) for qw/ |
1d68af04 |
648 | Class::MOP::Package |
649 | Class::MOP::Module |
650 | Class::MOP::Class |
651 | |
0b9372a2 |
652 | Class::MOP::Attribute |
1d68af04 |
653 | Class::MOP::Method |
654 | Class::MOP::Instance |
655 | |
656 | Class::MOP::Object |
0b9372a2 |
657 | |
565f0cbb |
658 | Class::MOP::Method::Generated |
1d68af04 |
659 | |
ba38bf08 |
660 | Class::MOP::Method::Accessor |
1d68af04 |
661 | Class::MOP::Method::Constructor |
662 | Class::MOP::Method::Wrapped |
0b9372a2 |
663 | /; |
b6164407 |
664 | |
94b19069 |
665 | 1; |
666 | |
667 | __END__ |
668 | |
669 | =pod |
670 | |
1d68af04 |
671 | =head1 NAME |
94b19069 |
672 | |
673 | Class::MOP - A Meta Object Protocol for Perl 5 |
674 | |
5b60bf98 |
675 | =head1 DESCRIPTION |
94b19069 |
676 | |
127d39a7 |
677 | This module is a fully functioning meta object protocol for the |
1d68af04 |
678 | Perl 5 object system. It makes no attempt to change the behavior or |
679 | characteristics of the Perl 5 object system, only to create a |
27e31eaf |
680 | protocol for its manipulation and introspection. |
94b19069 |
681 | |
828ecf13 |
682 | That said, it does attempt to create the tools for building a rich set |
683 | of extensions to the Perl 5 object system. Every attempt has been made |
684 | to abide by the spirit of the Perl 5 object system that we all know |
685 | and love. |
94b19069 |
686 | |
828ecf13 |
687 | This documentation is sparse on conceptual details. We suggest looking |
688 | at the items listed in the L<SEE ALSO> section for more |
689 | information. In particular the book "The Art of the Meta Object |
690 | Protocol" was very influential in the development of this system. |
40483095 |
691 | |
bfe4d0fc |
692 | =head2 What is a Meta Object Protocol? |
693 | |
1d68af04 |
694 | A meta object protocol is an API to an object system. |
bfe4d0fc |
695 | |
828ecf13 |
696 | To be more specific, it abstracts the components of an object system |
697 | (classes, object, methods, object attributes, etc.). These |
698 | abstractions can then be used to inspect and manipulate the object |
699 | system which they describe. |
bfe4d0fc |
700 | |
1d68af04 |
701 | It can be said that there are two MOPs for any object system; the |
828ecf13 |
702 | implicit MOP and the explicit MOP. The implicit MOP handles things |
1d68af04 |
703 | like method dispatch or inheritance, which happen automatically as |
704 | part of how the object system works. The explicit MOP typically |
705 | handles the introspection/reflection features of the object system. |
bfe4d0fc |
706 | |
828ecf13 |
707 | All object systems have implicit MOPs. Without one, they would not |
5b60bf98 |
708 | work. Explicit MOPs are much less common, and depending on the |
709 | language can vary from restrictive (Reflection in Java or C#) to wide |
710 | open (CLOS is a perfect example). |
e16da3e6 |
711 | |
828ecf13 |
712 | =head2 Yet Another Class Builder! Why? |
713 | |
714 | This is B<not> a class builder so much as a I<class builder |
715 | B<builder>>. The intent is that an end user will not use this module |
716 | directly, but instead this module is used by module authors to build |
717 | extensions and features onto the Perl 5 object system. |
718 | |
719 | This system is used by L<Moose>, which supplies a powerful class |
720 | builder system built entirely on top of C<Class::MOP>. |
e16da3e6 |
721 | |
94b19069 |
722 | =head2 Who is this module for? |
723 | |
828ecf13 |
724 | This module is for anyone who has ever created or wanted to create a |
725 | module for the Class:: namespace. The tools which this module provides |
726 | make doing complex Perl 5 wizardry simpler, by removing such barriers |
727 | as the need to hack symbol tables, or understand the fine details of |
728 | method dispatch. |
94b19069 |
729 | |
bfe4d0fc |
730 | =head2 What changes do I have to make to use this module? |
731 | |
828ecf13 |
732 | This module was designed to be as unintrusive as possible. Many of its |
5b60bf98 |
733 | features are accessible without B<any> change to your existing |
828ecf13 |
734 | code. It is meant to be a compliment to your existing code and not an |
735 | intrusion on your code base. Unlike many other B<Class::> modules, |
736 | this module B<does not> require you subclass it, or even that you |
737 | C<use> it in within your module's package. |
bfe4d0fc |
738 | |
1d68af04 |
739 | The only features which requires additions to your code are the |
2eb717d5 |
740 | attribute handling and instance construction features, and these are |
1d68af04 |
741 | both completely optional features. The only reason for this is because |
742 | Perl 5's object system does not actually have these features built |
2eb717d5 |
743 | in. More information about this feature can be found below. |
bfe4d0fc |
744 | |
828ecf13 |
745 | =head2 About Performance |
746 | |
5b60bf98 |
747 | It is a common misconception that explicit MOPs are a performance hit. |
828ecf13 |
748 | This is not a universal truth, it is a side-effect of some specific |
749 | implementations. For instance, using Java reflection is slow because |
750 | the JVM cannot take advantage of any compiler optimizations, and the |
751 | JVM has to deal with much more runtime type information as well. |
bfe4d0fc |
752 | |
828ecf13 |
753 | Reflection in C# is marginally better as it was designed into the |
754 | language and runtime (the CLR). In contrast, CLOS (the Common Lisp |
755 | Object System) was built to support an explicit MOP, and so |
756 | performance is tuned for it. |
1d68af04 |
757 | |
828ecf13 |
758 | This library in particular does its absolute best to avoid putting |
1d68af04 |
759 | B<any> drain at all upon your code's performance. In fact, by itself |
828ecf13 |
760 | it does nothing to affect your existing code. So you only pay for what |
761 | you actually use. |
bfe4d0fc |
762 | |
550d56db |
763 | =head2 About Metaclass compatibility |
764 | |
1d68af04 |
765 | This module makes sure that all metaclasses created are both upwards |
766 | and downwards compatible. The topic of metaclass compatibility is |
767 | highly esoteric and is something only encountered when doing deep and |
768 | involved metaclass hacking. There are two basic kinds of metaclass |
769 | incompatibility; upwards and downwards. |
550d56db |
770 | |
1d68af04 |
771 | Upwards metaclass compatibility means that the metaclass of a |
772 | given class is either the same as (or a subclass of) all of the |
550d56db |
773 | class's ancestors. |
774 | |
1d68af04 |
775 | Downward metaclass compatibility means that the metaclasses of a |
828ecf13 |
776 | given class's ancestors are all either the same as (or a subclass |
550d56db |
777 | of) that metaclass. |
778 | |
1d68af04 |
779 | Here is a diagram showing a set of two classes (C<A> and C<B>) and |
780 | two metaclasses (C<Meta::A> and C<Meta::B>) which have correct |
550d56db |
781 | metaclass compatibility both upwards and downwards. |
782 | |
783 | +---------+ +---------+ |
784 | | Meta::A |<----| Meta::B | <....... (instance of ) |
1d68af04 |
785 | +---------+ +---------+ <------- (inherits from) |
550d56db |
786 | ^ ^ |
787 | : : |
788 | +---------+ +---------+ |
789 | | A |<----| B | |
790 | +---------+ +---------+ |
791 | |
1d68af04 |
792 | As I said this is a highly esoteric topic and one you will only run |
828ecf13 |
793 | into if you do a lot of subclassing of L<Class::MOP::Class>. If you |
794 | are interested in why this is an issue see the paper I<Uniform and |
795 | safe metaclass composition> linked to in the L<SEE ALSO> section of |
796 | this document. |
550d56db |
797 | |
aa448b16 |
798 | =head2 Using custom metaclasses |
799 | |
828ecf13 |
800 | Always use the L<metaclass> pragma when using a custom metaclass, this |
5b60bf98 |
801 | will ensure the proper initialization order and not accidentally |
802 | create an incorrect type of metaclass for you. This is a very rare |
803 | problem, and one which can only occur if you are doing deep metaclass |
aa448b16 |
804 | programming. So in other words, don't worry about it. |
805 | |
828ecf13 |
806 | Note that if you're using L<Moose> we encourage you to I<not> use |
807 | L<metaclass> pragma, and instead use L<Moose::Util::MetaRole> to apply |
808 | roles to a class's metaclasses. This topic is covered at length in |
809 | various L<Moose::Cookbook> recipes. |
810 | |
94b19069 |
811 | =head1 PROTOCOLS |
812 | |
828ecf13 |
813 | The meta-object protocol is divided into 4 main sub-protocols: |
94b19069 |
814 | |
828ecf13 |
815 | =head2 The Class protocol |
94b19069 |
816 | |
1d68af04 |
817 | This provides a means of manipulating and introspecting a Perl 5 |
828ecf13 |
818 | class. It handles symbol table hacking for you, and provides a rich |
819 | set of methods that go beyond simple package introspection. |
94b19069 |
820 | |
552e3d24 |
821 | See L<Class::MOP::Class> for more details. |
822 | |
828ecf13 |
823 | =head2 The Attribute protocol |
94b19069 |
824 | |
828ecf13 |
825 | This provides a consistent representation for an attribute of a Perl 5 |
826 | class. Since there are so many ways to create and handle attributes in |
827 | Perl 5 OO, the Attribute protocol provide as much of a unified |
828 | approach as possible. Of course, you are always free to extend this |
829 | protocol by subclassing the appropriate classes. |
94b19069 |
830 | |
552e3d24 |
831 | See L<Class::MOP::Attribute> for more details. |
832 | |
828ecf13 |
833 | =head2 The Method protocol |
94b19069 |
834 | |
828ecf13 |
835 | This provides a means of manipulating and introspecting methods in the |
836 | Perl 5 object system. As with attributes, there are many ways to |
1d68af04 |
837 | approach this topic, so we try to keep it pretty basic, while still |
94b19069 |
838 | making it possible to extend the system in many ways. |
839 | |
552e3d24 |
840 | See L<Class::MOP::Method> for more details. |
94b19069 |
841 | |
828ecf13 |
842 | =head2 The Instance protocol |
127d39a7 |
843 | |
828ecf13 |
844 | This provides a layer of abstraction for creating object instances. |
845 | Since the other layers use this protocol, it is relatively easy to |
846 | change the type of your instances from the default hash reference to |
847 | some other type of reference. Several examples are provided in the |
848 | F<examples/> directory included in this distribution. |
127d39a7 |
849 | |
850 | See L<Class::MOP::Instance> for more details. |
851 | |
be7677c7 |
852 | =head1 FUNCTIONS |
853 | |
828ecf13 |
854 | Note that this module does not export any constants or functions. |
855 | |
c1d5345a |
856 | =head2 Constants |
857 | |
858 | =over 4 |
859 | |
828ecf13 |
860 | =item I<Class::MOP::IS_RUNNING_ON_5_10> |
c1d5345a |
861 | |
828ecf13 |
862 | We set this constant depending on what version perl we are on, this |
863 | allows us to take advantage of new 5.10 features and stay backwards |
5b60bf98 |
864 | compatible. |
c1d5345a |
865 | |
866 | =back |
867 | |
448b6e55 |
868 | =head2 Utility functions |
869 | |
bd07fbdb |
870 | Note that these are all called as B<functions, not methods>. |
081a927b |
871 | |
448b6e55 |
872 | =over 4 |
873 | |
828ecf13 |
874 | =item B<Class::MOP::load_class($class_name)> |
448b6e55 |
875 | |
828ecf13 |
876 | This will load the specified C<$class_name>. This function can be used |
877 | in place of tricks like C<eval "use $module"> or using C<require> |
01f3a099 |
878 | unconditionally. This will return the metaclass of C<$class_name>. |
448b6e55 |
879 | |
828ecf13 |
880 | =item B<Class::MOP::is_class_loaded($class_name)> |
448b6e55 |
881 | |
15ab5451 |
882 | Returns a boolean indicating whether or not C<$class_name> has been |
883 | loaded. |
448b6e55 |
884 | |
828ecf13 |
885 | This does a basic check of the symbol table to try and determine as |
886 | best it can if the C<$class_name> is loaded, it is probably correct |
887 | about 99% of the time, but it can be fooled into reporting false |
888 | positives. |
448b6e55 |
889 | |
cdac22cc |
890 | =item B<Class::MOP::get_code_info($code)> |
891 | |
892 | This function returns two values, the name of the package the C<$code> |
893 | is from and the name of the C<$code> itself. This is used by several |
5b60bf98 |
894 | elements of the MOP to determine where a given C<$code> reference is |
cdac22cc |
895 | from. |
896 | |
44ba77a3 |
897 | =item B<Class::MOP::class_of($instance_or_class_name)> |
898 | |
899 | This will return the metaclass of the given instance or class name. |
900 | Even if the class lacks a metaclass, no metaclass will be initialized |
901 | and C<undef> will be returned. |
902 | |
828ecf13 |
903 | =item B<Class::MOP::check_package_cache_flag($pkg)> |
e0e4674a |
904 | |
bd07fbdb |
905 | B<NOTE: DO NOT USE THIS FUNCTION, IT IS FOR INTERNAL USE ONLY!> |
906 | |
828ecf13 |
907 | This will return an integer that is managed by L<Class::MOP::Class> to |
908 | determine if a module's symbol table has been altered. |
127d39a7 |
909 | |
828ecf13 |
910 | In Perl 5.10 or greater, this flag is package specific. However in |
911 | versions prior to 5.10, this will use the C<PL_sub_generation> |
912 | variable which is not package specific. |
127d39a7 |
913 | |
828ecf13 |
914 | =item B<Class::MOP::load_first_existing_class(@class_names)> |
063ad0c5 |
915 | |
916 | B<NOTE: DO NOT USE THIS FUNCTION, IT IS FOR INTERNAL USE ONLY!> |
917 | |
918 | Given a list of class names, this function will attempt to load each |
919 | one in turn. |
920 | |
828ecf13 |
921 | If it finds a class it can load, it will return that class' name. If |
922 | none of the classes can be loaded, it will throw an exception. |
063ad0c5 |
923 | |
448b6e55 |
924 | =back |
925 | |
926 | =head2 Metaclass cache functions |
927 | |
6c842677 |
928 | Class::MOP holds a cache of metaclasses. The following are functions |
1d68af04 |
929 | (B<not methods>) which can be used to access that cache. It is not |
6c842677 |
930 | recommended that you mess with these. Bad things could happen, but if |
931 | you are brave and willing to risk it: go for it! |
be7677c7 |
932 | |
933 | =over 4 |
934 | |
828ecf13 |
935 | =item B<Class::MOP::get_all_metaclasses> |
be7677c7 |
936 | |
6c842677 |
937 | This will return a hash of all the metaclass instances that have |
828ecf13 |
938 | been cached by L<Class::MOP::Class>, keyed by the package name. |
b9d9fc0b |
939 | |
828ecf13 |
940 | =item B<Class::MOP::get_all_metaclass_instances> |
be7677c7 |
941 | |
6c842677 |
942 | This will return a list of all the metaclass instances that have |
828ecf13 |
943 | been cached by L<Class::MOP::Class>. |
b9d9fc0b |
944 | |
828ecf13 |
945 | =item B<Class::MOP::get_all_metaclass_names> |
be7677c7 |
946 | |
6c842677 |
947 | This will return a list of all the metaclass names that have |
828ecf13 |
948 | been cached by L<Class::MOP::Class>. |
b9d9fc0b |
949 | |
828ecf13 |
950 | =item B<Class::MOP::get_metaclass_by_name($name)> |
be7677c7 |
951 | |
828ecf13 |
952 | This will return a cached L<Class::MOP::Class> instance, or nothing |
6c842677 |
953 | if no metaclass exists with that C<$name>. |
127d39a7 |
954 | |
828ecf13 |
955 | =item B<Class::MOP::store_metaclass_by_name($name, $meta)> |
be7677c7 |
956 | |
127d39a7 |
957 | This will store a metaclass in the cache at the supplied C<$key>. |
958 | |
828ecf13 |
959 | =item B<Class::MOP::weaken_metaclass($name)> |
be7677c7 |
960 | |
6c842677 |
961 | In rare cases (e.g. anonymous metaclasses) it is desirable to |
962 | store a weakened reference in the metaclass cache. This |
963 | function will weaken the reference to the metaclass stored |
964 | in C<$name>. |
127d39a7 |
965 | |
828ecf13 |
966 | =item B<Class::MOP::does_metaclass_exist($name)> |
be7677c7 |
967 | |
828ecf13 |
968 | This will return true of there exists a metaclass stored in the |
6c842677 |
969 | C<$name> key, and return false otherwise. |
127d39a7 |
970 | |
828ecf13 |
971 | =item B<Class::MOP::remove_metaclass_by_name($name)> |
be7677c7 |
972 | |
6c842677 |
973 | This will remove the metaclass stored in the C<$name> key. |
127d39a7 |
974 | |
be7677c7 |
975 | =back |
976 | |
552e3d24 |
977 | =head1 SEE ALSO |
8b978dd5 |
978 | |
552e3d24 |
979 | =head2 Books |
8b978dd5 |
980 | |
1d68af04 |
981 | There are very few books out on Meta Object Protocols and Metaclasses |
982 | because it is such an esoteric topic. The following books are really |
983 | the only ones I have found. If you know of any more, B<I<please>> |
a2e85e6c |
984 | email me and let me know, I would love to hear about them. |
985 | |
8b978dd5 |
986 | =over 4 |
987 | |
15ab5451 |
988 | =item I<The Art of the Meta Object Protocol> |
8b978dd5 |
989 | |
15ab5451 |
990 | =item I<Advances in Object-Oriented Metalevel Architecture and Reflection> |
8b978dd5 |
991 | |
15ab5451 |
992 | =item I<Putting MetaClasses to Work> |
b51af7f9 |
993 | |
15ab5451 |
994 | =item I<Smalltalk: The Language> |
a2e85e6c |
995 | |
94b19069 |
996 | =back |
997 | |
550d56db |
998 | =head2 Papers |
999 | |
1000 | =over 4 |
1001 | |
15ab5451 |
1002 | =item "Uniform and safe metaclass composition" |
550d56db |
1003 | |
1d68af04 |
1004 | An excellent paper by the people who brought us the original Traits paper. |
1005 | This paper is on how Traits can be used to do safe metaclass composition, |
1006 | and offers an excellent introduction section which delves into the topic of |
550d56db |
1007 | metaclass compatibility. |
1008 | |
1009 | L<http://www.iam.unibe.ch/~scg/Archive/Papers/Duca05ySafeMetaclassTrait.pdf> |
1010 | |
15ab5451 |
1011 | =item "Safe Metaclass Programming" |
550d56db |
1012 | |
1d68af04 |
1013 | This paper seems to precede the above paper, and propose a mix-in based |
1014 | approach as opposed to the Traits based approach. Both papers have similar |
1015 | information on the metaclass compatibility problem space. |
550d56db |
1016 | |
1017 | L<http://citeseer.ist.psu.edu/37617.html> |
1018 | |
1019 | =back |
1020 | |
552e3d24 |
1021 | =head2 Prior Art |
8b978dd5 |
1022 | |
1023 | =over 4 |
1024 | |
7184ca14 |
1025 | =item The Perl 6 MetaModel work in the Pugs project |
8b978dd5 |
1026 | |
1027 | =over 4 |
1028 | |
552e3d24 |
1029 | =item L<http://svn.openfoundry.org/pugs/perl5/Perl6-MetaModel> |
8b978dd5 |
1030 | |
552e3d24 |
1031 | =item L<http://svn.openfoundry.org/pugs/perl5/Perl6-ObjectSpace> |
8b978dd5 |
1032 | |
1033 | =back |
1034 | |
94b19069 |
1035 | =back |
1036 | |
1d68af04 |
1037 | =head2 Articles |
f8dfcfb7 |
1038 | |
1039 | =over 4 |
1040 | |
1d68af04 |
1041 | =item CPAN Module Review of Class::MOP |
f8dfcfb7 |
1042 | |
1043 | L<http://www.oreillynet.com/onlamp/blog/2006/06/cpan_module_review_classmop.html> |
1044 | |
1045 | =back |
1046 | |
a2e85e6c |
1047 | =head1 SIMILAR MODULES |
1048 | |
1d68af04 |
1049 | As I have said above, this module is a class-builder-builder, so it is |
1050 | not the same thing as modules like L<Class::Accessor> and |
1051 | L<Class::MethodMaker>. That being said there are very few modules on CPAN |
1052 | with similar goals to this module. The one I have found which is most |
1053 | like this module is L<Class::Meta>, although it's philosophy and the MOP it |
1054 | creates are very different from this modules. |
94b19069 |
1055 | |
a2e85e6c |
1056 | =head1 BUGS |
1057 | |
1d68af04 |
1058 | All complex software has bugs lurking in it, and this module is no |
a2e85e6c |
1059 | exception. If you find a bug please either email me, or add the bug |
1060 | to cpan-RT. |
1061 | |
1062 | =head1 ACKNOWLEDGEMENTS |
1063 | |
1064 | =over 4 |
1065 | |
b9d9fc0b |
1066 | =item Rob Kinyon |
a2e85e6c |
1067 | |
1d68af04 |
1068 | Thanks to Rob for actually getting the development of this module kick-started. |
a2e85e6c |
1069 | |
1070 | =back |
1071 | |
1a09d9cc |
1072 | =head1 AUTHORS |
94b19069 |
1073 | |
a2e85e6c |
1074 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
552e3d24 |
1075 | |
9c8cda90 |
1076 | B<with contributions from:> |
1077 | |
1078 | Brandon (blblack) Black |
1079 | |
4f116037 |
1080 | Florian (rafl) Ragwitz |
1081 | |
9c8cda90 |
1082 | Guillermo (groditi) Roditi |
1083 | |
9195ddff |
1084 | Matt (mst) Trout |
1085 | |
9c8cda90 |
1086 | Rob (robkinyon) Kinyon |
1087 | |
1088 | Yuval (nothingmuch) Kogman |
1a09d9cc |
1089 | |
f430cfa4 |
1090 | Scott (konobi) McWhirter |
1091 | |
94b19069 |
1092 | =head1 COPYRIGHT AND LICENSE |
1093 | |
070bb6c9 |
1094 | Copyright 2006-2009 by Infinity Interactive, Inc. |
94b19069 |
1095 | |
1096 | L<http://www.iinteractive.com> |
1097 | |
1098 | This library is free software; you can redistribute it and/or modify |
1d68af04 |
1099 | it under the same terms as Perl itself. |
94b19069 |
1100 | |
1101 | =cut |