Commit | Line | Data |
94b19069 |
1 | |
2 | package Class::MOP; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
5a2932cf |
7 | use 5.008; |
8 | |
3cf322a0 |
9 | use MRO::Compat; |
10 | |
4c105333 |
11 | use Carp 'confess'; |
12 | use Scalar::Util 'weaken'; |
8b978dd5 |
13 | |
0531f510 |
14 | use Sub::Identify 'get_code_info'; |
15 | |
fc4f8f91 |
16 | BEGIN { |
17 | local $@; |
18 | eval { |
19 | require Sub::Name; |
20 | Sub::Name->import(qw(subname)); |
21 | 1 |
22 | } or eval 'sub subname { $_[1] }'; |
23 | |
24 | # this is either part of core or set up appropriately by MRO::Compat |
25 | *check_package_cache_flag = \&mro::get_pkg_gen; |
712ecd18 |
26 | |
27 | eval { |
28 | require Devel::GlobalDestruction; |
29 | Devel::GlobalDestruction->import("in_global_destruction"); |
30 | 1; |
3fe042df |
31 | } or *in_global_destruction = sub () { !1 }; |
fc4f8f91 |
32 | } |
33 | |
34 | |
0531f510 |
35 | use Class::MOP::Class; |
36 | use Class::MOP::Attribute; |
37 | use Class::MOP::Method; |
38 | |
39 | use Class::MOP::Immutable; |
40 | |
b1f5f41d |
41 | BEGIN { |
11b56828 |
42 | *IS_RUNNING_ON_5_10 = ($] < 5.009_005) |
43 | ? sub () { 0 } |
4c105333 |
44 | : sub () { 1 }; |
46b23b44 |
45 | |
9efe16ca |
46 | *HAVE_ISAREV = defined(&mro::get_isarev) |
47 | ? sub () { 1 } |
48 | : sub () { 1 }; |
b1f5f41d |
49 | } |
e0e4674a |
50 | |
9457b596 |
51 | our $VERSION = '0.64_06'; |
8a7085c1 |
52 | our $XS_VERSION = $VERSION; |
d519662a |
53 | $VERSION = eval $VERSION; |
fc4f8f91 |
54 | our $AUTHORITY = 'cpan:STEVAN'; |
55 | |
0531f510 |
56 | # after that everything is loaded, if we're allowed try to load faster XS |
57 | # versions of various things |
58 | unless ($ENV{CLASS_MOP_NO_XS}) { |
59 | my $e = do { |
60 | local $@; |
61 | eval { |
62 | require XSLoader; |
8a7085c1 |
63 | __PACKAGE__->XSLoader::load($XS_VERSION); |
0531f510 |
64 | }; |
65 | $@; |
66 | }; |
15273f3c |
67 | |
0531f510 |
68 | die $e if $e && $e !~ /object version|loadable object/; |
69 | } |
15273f3c |
70 | |
be7677c7 |
71 | { |
72 | # Metaclasses are singletons, so we cache them here. |
73 | # there is no need to worry about destruction though |
74 | # because they should die only when the program dies. |
75 | # After all, do package definitions even get reaped? |
1d68af04 |
76 | my %METAS; |
77 | |
78 | # means of accessing all the metaclasses that have |
be7677c7 |
79 | # been initialized thus far (for mugwumps obj browser) |
1d68af04 |
80 | sub get_all_metaclasses { %METAS } |
81 | sub get_all_metaclass_instances { values %METAS } |
82 | sub get_all_metaclass_names { keys %METAS } |
be7677c7 |
83 | sub get_metaclass_by_name { $METAS{$_[0]} } |
1d68af04 |
84 | sub store_metaclass_by_name { $METAS{$_[0]} = $_[1] } |
85 | sub weaken_metaclass { weaken($METAS{$_[0]}) } |
be7677c7 |
86 | sub does_metaclass_exist { exists $METAS{$_[0]} && defined $METAS{$_[0]} } |
1d68af04 |
87 | sub remove_metaclass_by_name { $METAS{$_[0]} = undef } |
88 | |
be7677c7 |
89 | # NOTE: |
1d68af04 |
90 | # We only cache metaclasses, meaning instances of |
91 | # Class::MOP::Class. We do not cache instance of |
be7677c7 |
92 | # Class::MOP::Package or Class::MOP::Module. Mostly |
1d68af04 |
93 | # because I don't yet see a good reason to do so. |
be7677c7 |
94 | } |
95 | |
448b6e55 |
96 | sub load_class { |
97 | my $class = shift; |
ab5e2f48 |
98 | |
99 | if (ref($class) || !defined($class) || !length($class)) { |
100 | my $display = defined($class) ? $class : 'undef'; |
101 | confess "Invalid class name ($display)"; |
102 | } |
103 | |
07940968 |
104 | # if the class is not already loaded in the symbol table.. |
105 | unless (is_class_loaded($class)) { |
106 | # require it |
40b017cf |
107 | my $e = do { local $@; eval "require $class"; $@ }; |
1b8d9282 |
108 | confess "Could not load class ($class) because : $e" if $e; |
07940968 |
109 | } |
110 | |
111 | # initialize a metaclass if necessary |
448b6e55 |
112 | unless (does_metaclass_exist($class)) { |
1b8d9282 |
113 | my $e = do { local $@; eval { Class::MOP::Class->initialize($class) }; $@ }; |
114 | confess "Could not initialize class ($class) because : $e" if $e; |
448b6e55 |
115 | } |
07940968 |
116 | |
1b8d9282 |
117 | return get_metaclass_by_name($class) if defined wantarray; |
448b6e55 |
118 | } |
119 | |
120 | sub is_class_loaded { |
c1d5345a |
121 | my $class = shift; |
26fcef27 |
122 | |
123 | return 0 if ref($class) || !defined($class) || !length($class); |
124 | |
125 | # walk the symbol table tree to avoid autovififying |
126 | # \*{${main::}{"Foo::"}} == \*main::Foo:: |
127 | |
128 | my $pack = \*::; |
129 | foreach my $part (split('::', $class)) { |
130 | return 0 unless exists ${$$pack}{"${part}::"}; |
131 | $pack = \*{${$$pack}{"${part}::"}}; |
c1d5345a |
132 | } |
26fcef27 |
133 | |
134 | # check for $VERSION or @ISA |
135 | return 1 if exists ${$$pack}{VERSION} |
136 | && defined *{${$$pack}{VERSION}}{SCALAR}; |
137 | return 1 if exists ${$$pack}{ISA} |
138 | && defined *{${$$pack}{ISA}}{ARRAY}; |
139 | |
140 | # check for any method |
141 | foreach ( keys %{$$pack} ) { |
142 | next if substr($_, -2, 2) eq '::'; |
d5be3722 |
143 | |
144 | my $glob = ${$$pack}{$_} || next; |
145 | |
9e275e86 |
146 | # constant subs |
d5be3722 |
147 | if ( IS_RUNNING_ON_5_10 ) { |
148 | return 1 if ref $glob eq 'SCALAR'; |
149 | } |
150 | |
151 | return 1 if defined *{$glob}{CODE}; |
26fcef27 |
152 | } |
153 | |
154 | # fail |
c1d5345a |
155 | return 0; |
448b6e55 |
156 | } |
157 | |
158 | |
aa448b16 |
159 | ## ---------------------------------------------------------------------------- |
160 | ## Setting up our environment ... |
161 | ## ---------------------------------------------------------------------------- |
1d68af04 |
162 | ## Class::MOP needs to have a few things in the global perl environment so |
aa448b16 |
163 | ## that it can operate effectively. Those things are done here. |
164 | ## ---------------------------------------------------------------------------- |
165 | |
3bf7644b |
166 | # ... nothing yet actually ;) |
8b978dd5 |
167 | |
b51af7f9 |
168 | ## ---------------------------------------------------------------------------- |
1d68af04 |
169 | ## Bootstrapping |
b51af7f9 |
170 | ## ---------------------------------------------------------------------------- |
1d68af04 |
171 | ## The code below here is to bootstrap our MOP with itself. This is also |
b51af7f9 |
172 | ## sometimes called "tying the knot". By doing this, we make it much easier |
173 | ## to extend the MOP through subclassing and such since now you can use the |
1d68af04 |
174 | ## MOP itself to extend itself. |
175 | ## |
b51af7f9 |
176 | ## Yes, I know, thats weird and insane, but it's a good thing, trust me :) |
1d68af04 |
177 | ## ---------------------------------------------------------------------------- |
727919c5 |
178 | |
1d68af04 |
179 | # We need to add in the meta-attributes here so that |
180 | # any subclass of Class::MOP::* will be able to |
727919c5 |
181 | # inherit them using &construct_instance |
182 | |
f0480c45 |
183 | ## -------------------------------------------------------- |
6d5355c3 |
184 | ## Class::MOP::Package |
727919c5 |
185 | |
6d5355c3 |
186 | Class::MOP::Package->meta->add_attribute( |
8683db0e |
187 | Class::MOP::Attribute->new('package' => ( |
b880e0de |
188 | reader => { |
1d68af04 |
189 | # NOTE: we need to do this in order |
190 | # for the instance meta-object to |
b880e0de |
191 | # not fall into meta-circular death |
1d68af04 |
192 | # |
ce2ae40f |
193 | # we just alias the original method |
1d68af04 |
194 | # rather than re-produce it here |
ce2ae40f |
195 | 'name' => \&Class::MOP::Package::name |
b880e0de |
196 | }, |
727919c5 |
197 | )) |
198 | ); |
199 | |
a5e51f0b |
200 | Class::MOP::Package->meta->add_attribute( |
8683db0e |
201 | Class::MOP::Attribute->new('namespace' => ( |
a5e51f0b |
202 | reader => { |
56dcfc1a |
203 | # NOTE: |
ce2ae40f |
204 | # we just alias the original method |
205 | # rather than re-produce it here |
206 | 'namespace' => \&Class::MOP::Package::namespace |
a5e51f0b |
207 | }, |
2e877f58 |
208 | init_arg => undef, |
c4260b45 |
209 | default => sub { \undef } |
a5e51f0b |
210 | )) |
211 | ); |
212 | |
f0480c45 |
213 | ## -------------------------------------------------------- |
214 | ## Class::MOP::Module |
215 | |
216 | # NOTE: |
1d68af04 |
217 | # yeah this is kind of stretching things a bit, |
f0480c45 |
218 | # but truthfully the version should be an attribute |
1d68af04 |
219 | # of the Module, the weirdness comes from having to |
220 | # stick to Perl 5 convention and store it in the |
221 | # $VERSION package variable. Basically if you just |
222 | # squint at it, it will look how you want it to look. |
f0480c45 |
223 | # Either as a package variable, or as a attribute of |
224 | # the metaclass, isn't abstraction great :) |
225 | |
226 | Class::MOP::Module->meta->add_attribute( |
8683db0e |
227 | Class::MOP::Attribute->new('version' => ( |
f0480c45 |
228 | reader => { |
ce2ae40f |
229 | # NOTE: |
230 | # we just alias the original method |
1d68af04 |
231 | # rather than re-produce it here |
ce2ae40f |
232 | 'version' => \&Class::MOP::Module::version |
f0480c45 |
233 | }, |
2e877f58 |
234 | init_arg => undef, |
c4260b45 |
235 | default => sub { \undef } |
f0480c45 |
236 | )) |
237 | ); |
238 | |
239 | # NOTE: |
1d68af04 |
240 | # By following the same conventions as version here, |
241 | # we are opening up the possibility that people can |
242 | # use the $AUTHORITY in non-Class::MOP modules as |
243 | # well. |
f0480c45 |
244 | |
245 | Class::MOP::Module->meta->add_attribute( |
8683db0e |
246 | Class::MOP::Attribute->new('authority' => ( |
f0480c45 |
247 | reader => { |
ce2ae40f |
248 | # NOTE: |
249 | # we just alias the original method |
1d68af04 |
250 | # rather than re-produce it here |
ce2ae40f |
251 | 'authority' => \&Class::MOP::Module::authority |
1d68af04 |
252 | }, |
2e877f58 |
253 | init_arg => undef, |
c4260b45 |
254 | default => sub { \undef } |
f0480c45 |
255 | )) |
256 | ); |
257 | |
258 | ## -------------------------------------------------------- |
6d5355c3 |
259 | ## Class::MOP::Class |
260 | |
727919c5 |
261 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
262 | Class::MOP::Attribute->new('attributes' => ( |
f7259199 |
263 | reader => { |
1d68af04 |
264 | # NOTE: we need to do this in order |
265 | # for the instance meta-object to |
266 | # not fall into meta-circular death |
267 | # |
ce2ae40f |
268 | # we just alias the original method |
1d68af04 |
269 | # rather than re-produce it here |
ce2ae40f |
270 | 'get_attribute_map' => \&Class::MOP::Class::get_attribute_map |
f7259199 |
271 | }, |
727919c5 |
272 | default => sub { {} } |
273 | )) |
274 | ); |
275 | |
351bd7d4 |
276 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
277 | Class::MOP::Attribute->new('methods' => ( |
1d68af04 |
278 | reader => { |
ce2ae40f |
279 | # NOTE: |
280 | # we just alias the original method |
1d68af04 |
281 | # rather than re-produce it here |
ce2ae40f |
282 | 'get_method_map' => \&Class::MOP::Class::get_method_map |
92330ee2 |
283 | }, |
7855ddba |
284 | default => sub { {} } |
c4260b45 |
285 | )) |
286 | ); |
287 | |
288 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
289 | Class::MOP::Attribute->new('superclasses' => ( |
c23184fc |
290 | accessor => { |
291 | # NOTE: |
292 | # we just alias the original method |
1d68af04 |
293 | # rather than re-produce it here |
c23184fc |
294 | 'superclasses' => \&Class::MOP::Class::superclasses |
295 | }, |
2e877f58 |
296 | init_arg => undef, |
c23184fc |
297 | default => sub { \undef } |
298 | )) |
299 | ); |
300 | |
301 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
302 | Class::MOP::Attribute->new('attribute_metaclass' => ( |
1d68af04 |
303 | reader => { |
6d2118a4 |
304 | # NOTE: |
305 | # we just alias the original method |
1d68af04 |
306 | # rather than re-produce it here |
6d2118a4 |
307 | 'attribute_metaclass' => \&Class::MOP::Class::attribute_metaclass |
1d68af04 |
308 | }, |
351bd7d4 |
309 | default => 'Class::MOP::Attribute', |
310 | )) |
311 | ); |
312 | |
313 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
314 | Class::MOP::Attribute->new('method_metaclass' => ( |
1d68af04 |
315 | reader => { |
6d2118a4 |
316 | # NOTE: |
317 | # we just alias the original method |
1d68af04 |
318 | # rather than re-produce it here |
6d2118a4 |
319 | 'method_metaclass' => \&Class::MOP::Class::method_metaclass |
320 | }, |
1d68af04 |
321 | default => 'Class::MOP::Method', |
351bd7d4 |
322 | )) |
323 | ); |
324 | |
2bab2be6 |
325 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
326 | Class::MOP::Attribute->new('instance_metaclass' => ( |
b880e0de |
327 | reader => { |
1d68af04 |
328 | # NOTE: we need to do this in order |
329 | # for the instance meta-object to |
330 | # not fall into meta-circular death |
331 | # |
ce2ae40f |
332 | # we just alias the original method |
1d68af04 |
333 | # rather than re-produce it here |
ce2ae40f |
334 | 'instance_metaclass' => \&Class::MOP::Class::instance_metaclass |
b880e0de |
335 | }, |
1d68af04 |
336 | default => 'Class::MOP::Instance', |
2bab2be6 |
337 | )) |
338 | ); |
339 | |
9d6dce77 |
340 | # NOTE: |
1d68af04 |
341 | # we don't actually need to tie the knot with |
342 | # Class::MOP::Class here, it is actually handled |
343 | # within Class::MOP::Class itself in the |
344 | # construct_class_instance method. |
9d6dce77 |
345 | |
f0480c45 |
346 | ## -------------------------------------------------------- |
727919c5 |
347 | ## Class::MOP::Attribute |
348 | |
7b31baf4 |
349 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
350 | Class::MOP::Attribute->new('name' => ( |
c23184fc |
351 | reader => { |
1d68af04 |
352 | # NOTE: we need to do this in order |
353 | # for the instance meta-object to |
354 | # not fall into meta-circular death |
355 | # |
ce2ae40f |
356 | # we just alias the original method |
1d68af04 |
357 | # rather than re-produce it here |
ce2ae40f |
358 | 'name' => \&Class::MOP::Attribute::name |
b880e0de |
359 | } |
7b31baf4 |
360 | )) |
361 | ); |
362 | |
363 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
364 | Class::MOP::Attribute->new('associated_class' => ( |
c23184fc |
365 | reader => { |
1d68af04 |
366 | # NOTE: we need to do this in order |
367 | # for the instance meta-object to |
368 | # not fall into meta-circular death |
369 | # |
ce2ae40f |
370 | # we just alias the original method |
1d68af04 |
371 | # rather than re-produce it here |
ce2ae40f |
372 | 'associated_class' => \&Class::MOP::Attribute::associated_class |
b880e0de |
373 | } |
7b31baf4 |
374 | )) |
375 | ); |
376 | |
377 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
378 | Class::MOP::Attribute->new('accessor' => ( |
6d2118a4 |
379 | reader => { 'accessor' => \&Class::MOP::Attribute::accessor }, |
380 | predicate => { 'has_accessor' => \&Class::MOP::Attribute::has_accessor }, |
7b31baf4 |
381 | )) |
382 | ); |
383 | |
384 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
385 | Class::MOP::Attribute->new('reader' => ( |
6d2118a4 |
386 | reader => { 'reader' => \&Class::MOP::Attribute::reader }, |
387 | predicate => { 'has_reader' => \&Class::MOP::Attribute::has_reader }, |
7b31baf4 |
388 | )) |
389 | ); |
390 | |
391 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
392 | Class::MOP::Attribute->new('initializer' => ( |
8ee74136 |
393 | reader => { 'initializer' => \&Class::MOP::Attribute::initializer }, |
394 | predicate => { 'has_initializer' => \&Class::MOP::Attribute::has_initializer }, |
0ab65f99 |
395 | )) |
396 | ); |
397 | |
398 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
399 | Class::MOP::Attribute->new('writer' => ( |
6d2118a4 |
400 | reader => { 'writer' => \&Class::MOP::Attribute::writer }, |
401 | predicate => { 'has_writer' => \&Class::MOP::Attribute::has_writer }, |
7b31baf4 |
402 | )) |
403 | ); |
404 | |
405 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
406 | Class::MOP::Attribute->new('predicate' => ( |
6d2118a4 |
407 | reader => { 'predicate' => \&Class::MOP::Attribute::predicate }, |
408 | predicate => { 'has_predicate' => \&Class::MOP::Attribute::has_predicate }, |
7b31baf4 |
409 | )) |
410 | ); |
411 | |
412 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
413 | Class::MOP::Attribute->new('clearer' => ( |
6d2118a4 |
414 | reader => { 'clearer' => \&Class::MOP::Attribute::clearer }, |
415 | predicate => { 'has_clearer' => \&Class::MOP::Attribute::has_clearer }, |
7d28758b |
416 | )) |
417 | ); |
418 | |
419 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
420 | Class::MOP::Attribute->new('builder' => ( |
1d68af04 |
421 | reader => { 'builder' => \&Class::MOP::Attribute::builder }, |
422 | predicate => { 'has_builder' => \&Class::MOP::Attribute::has_builder }, |
423 | )) |
424 | ); |
425 | |
426 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
427 | Class::MOP::Attribute->new('init_arg' => ( |
6d2118a4 |
428 | reader => { 'init_arg' => \&Class::MOP::Attribute::init_arg }, |
429 | predicate => { 'has_init_arg' => \&Class::MOP::Attribute::has_init_arg }, |
7b31baf4 |
430 | )) |
431 | ); |
432 | |
433 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
434 | Class::MOP::Attribute->new('default' => ( |
7b31baf4 |
435 | # default has a custom 'reader' method ... |
1d68af04 |
436 | predicate => { 'has_default' => \&Class::MOP::Attribute::has_default }, |
7b31baf4 |
437 | )) |
438 | ); |
439 | |
3545c727 |
440 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
441 | Class::MOP::Attribute->new('associated_methods' => ( |
c23184fc |
442 | reader => { 'associated_methods' => \&Class::MOP::Attribute::associated_methods }, |
1d68af04 |
443 | default => sub { [] } |
3545c727 |
444 | )) |
445 | ); |
727919c5 |
446 | |
5659d76e |
447 | Class::MOP::Attribute->meta->add_method('clone' => sub { |
a740253a |
448 | my $self = shift; |
1d68af04 |
449 | $self->meta->clone_object($self, @_); |
727919c5 |
450 | }); |
451 | |
f0480c45 |
452 | ## -------------------------------------------------------- |
b6164407 |
453 | ## Class::MOP::Method |
b6164407 |
454 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
455 | Class::MOP::Attribute->new('body' => ( |
c23184fc |
456 | reader => { 'body' => \&Class::MOP::Method::body }, |
b6164407 |
457 | )) |
458 | ); |
459 | |
4c105333 |
460 | Class::MOP::Method->meta->add_attribute( |
5e607260 |
461 | Class::MOP::Attribute->new('associated_metaclass' => ( |
5e607260 |
462 | reader => { 'associated_metaclass' => \&Class::MOP::Method::associated_metaclass }, |
463 | )) |
464 | ); |
465 | |
466 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
467 | Class::MOP::Attribute->new('package_name' => ( |
4c105333 |
468 | reader => { 'package_name' => \&Class::MOP::Method::package_name }, |
469 | )) |
470 | ); |
471 | |
472 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
473 | Class::MOP::Attribute->new('name' => ( |
4c105333 |
474 | reader => { 'name' => \&Class::MOP::Method::name }, |
475 | )) |
476 | ); |
477 | |
4c105333 |
478 | Class::MOP::Method->meta->add_method('clone' => sub { |
479 | my $self = shift; |
480 | $self->meta->clone_object($self, @_); |
481 | }); |
482 | |
b6164407 |
483 | ## -------------------------------------------------------- |
484 | ## Class::MOP::Method::Wrapped |
485 | |
486 | # NOTE: |
1d68af04 |
487 | # the way this item is initialized, this |
488 | # really does not follow the standard |
489 | # practices of attributes, but we put |
b6164407 |
490 | # it here for completeness |
491 | Class::MOP::Method::Wrapped->meta->add_attribute( |
8683db0e |
492 | Class::MOP::Attribute->new('modifier_table') |
b6164407 |
493 | ); |
494 | |
495 | ## -------------------------------------------------------- |
565f0cbb |
496 | ## Class::MOP::Method::Generated |
497 | |
498 | Class::MOP::Method::Generated->meta->add_attribute( |
8683db0e |
499 | Class::MOP::Attribute->new('is_inline' => ( |
565f0cbb |
500 | reader => { 'is_inline' => \&Class::MOP::Method::Generated::is_inline }, |
4c105333 |
501 | default => 0, |
1d68af04 |
502 | )) |
565f0cbb |
503 | ); |
504 | |
505 | ## -------------------------------------------------------- |
d90b42a6 |
506 | ## Class::MOP::Method::Accessor |
507 | |
508 | Class::MOP::Method::Accessor->meta->add_attribute( |
8683db0e |
509 | Class::MOP::Attribute->new('attribute' => ( |
1d68af04 |
510 | reader => { |
511 | 'associated_attribute' => \&Class::MOP::Method::Accessor::associated_attribute |
d90b42a6 |
512 | }, |
1d68af04 |
513 | )) |
d90b42a6 |
514 | ); |
515 | |
516 | Class::MOP::Method::Accessor->meta->add_attribute( |
8683db0e |
517 | Class::MOP::Attribute->new('accessor_type' => ( |
c23184fc |
518 | reader => { 'accessor_type' => \&Class::MOP::Method::Accessor::accessor_type }, |
1d68af04 |
519 | )) |
d90b42a6 |
520 | ); |
521 | |
d90b42a6 |
522 | ## -------------------------------------------------------- |
523 | ## Class::MOP::Method::Constructor |
524 | |
525 | Class::MOP::Method::Constructor->meta->add_attribute( |
8683db0e |
526 | Class::MOP::Attribute->new('options' => ( |
1d68af04 |
527 | reader => { |
528 | 'options' => \&Class::MOP::Method::Constructor::options |
d90b42a6 |
529 | }, |
4c105333 |
530 | default => sub { +{} } |
1d68af04 |
531 | )) |
d90b42a6 |
532 | ); |
533 | |
534 | Class::MOP::Method::Constructor->meta->add_attribute( |
8683db0e |
535 | Class::MOP::Attribute->new('associated_metaclass' => ( |
e8a38403 |
536 | init_arg => "metaclass", # FIXME alias and rename |
1d68af04 |
537 | reader => { |
538 | 'associated_metaclass' => \&Class::MOP::Method::Constructor::associated_metaclass |
539 | }, |
540 | )) |
d90b42a6 |
541 | ); |
542 | |
543 | ## -------------------------------------------------------- |
86482605 |
544 | ## Class::MOP::Instance |
545 | |
546 | # NOTE: |
1d68af04 |
547 | # these don't yet do much of anything, but are just |
86482605 |
548 | # included for completeness |
549 | |
550 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
551 | Class::MOP::Attribute->new('associated_metaclass', |
552 | reader => { associated_metaclass => \&Class::MOP::Instance::associated_metaclass }, |
553 | ), |
86482605 |
554 | ); |
555 | |
556 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
557 | Class::MOP::Attribute->new('_class_name', |
558 | init_arg => undef, |
559 | reader => { _class_name => \&Class::MOP::Instance::_class_name }, |
560 | #lazy => 1, # not yet supported by Class::MOP but out our version does it anyway |
561 | #default => sub { $_[0]->associated_metaclass->name }, |
562 | ), |
563 | ); |
564 | |
565 | Class::MOP::Instance->meta->add_attribute( |
566 | Class::MOP::Attribute->new('attributes', |
0b5d46da |
567 | reader => { attributes => \&Class::MOP::Instance::get_all_attributes }, |
74890687 |
568 | ), |
32bfc810 |
569 | ); |
570 | |
571 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
572 | Class::MOP::Attribute->new('slots', |
573 | reader => { slots => \&Class::MOP::Instance::slots }, |
574 | ), |
86482605 |
575 | ); |
576 | |
63d08a9e |
577 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
578 | Class::MOP::Attribute->new('slot_hash', |
579 | reader => { slot_hash => \&Class::MOP::Instance::slot_hash }, |
580 | ), |
63d08a9e |
581 | ); |
582 | |
583 | |
caa051fa |
584 | # we need the meta instance of the meta instance to be created now, in order |
585 | # for the constructor to be able to use it |
586 | Class::MOP::Instance->meta->get_meta_instance; |
587 | |
caa051fa |
588 | # pretend the add_method never happenned. it hasn't yet affected anything |
589 | undef Class::MOP::Instance->meta->{_package_cache_flag}; |
590 | |
86482605 |
591 | ## -------------------------------------------------------- |
f0480c45 |
592 | ## Now close all the Class::MOP::* classes |
4d47b77f |
593 | |
0b9372a2 |
594 | # NOTE: |
1d68af04 |
595 | # we don't need to inline the |
596 | # constructors or the accessors |
597 | # this only lengthens the compile |
598 | # time of the MOP, and gives us |
0b9372a2 |
599 | # no actual benefits. |
600 | |
601 | $_->meta->make_immutable( |
6c2f6b5c |
602 | inline_constructor => 1, |
603 | replace_constructor => 1, |
604 | constructor_name => "_new", |
45582002 |
605 | inline_accessors => 0, |
0b9372a2 |
606 | ) for qw/ |
1d68af04 |
607 | Class::MOP::Package |
608 | Class::MOP::Module |
609 | Class::MOP::Class |
610 | |
0b9372a2 |
611 | Class::MOP::Attribute |
1d68af04 |
612 | Class::MOP::Method |
613 | Class::MOP::Instance |
614 | |
615 | Class::MOP::Object |
0b9372a2 |
616 | |
565f0cbb |
617 | Class::MOP::Method::Generated |
1d68af04 |
618 | |
ba38bf08 |
619 | Class::MOP::Method::Accessor |
1d68af04 |
620 | Class::MOP::Method::Constructor |
621 | Class::MOP::Method::Wrapped |
0b9372a2 |
622 | /; |
b6164407 |
623 | |
94b19069 |
624 | 1; |
625 | |
626 | __END__ |
627 | |
628 | =pod |
629 | |
1d68af04 |
630 | =head1 NAME |
94b19069 |
631 | |
632 | Class::MOP - A Meta Object Protocol for Perl 5 |
633 | |
94b19069 |
634 | =head1 DESCRIPTON |
635 | |
127d39a7 |
636 | This module is a fully functioning meta object protocol for the |
1d68af04 |
637 | Perl 5 object system. It makes no attempt to change the behavior or |
638 | characteristics of the Perl 5 object system, only to create a |
27e31eaf |
639 | protocol for its manipulation and introspection. |
94b19069 |
640 | |
1d68af04 |
641 | That said, it does attempt to create the tools for building a rich |
642 | set of extensions to the Perl 5 object system. Every attempt has been |
643 | made for these tools to keep to the spirit of the Perl 5 object |
94b19069 |
644 | system that we all know and love. |
645 | |
1d68af04 |
646 | This documentation is admittedly sparse on details, as time permits |
647 | I will try to improve them. For now, I suggest looking at the items |
648 | listed in the L<SEE ALSO> section for more information. In particular |
649 | the book "The Art of the Meta Object Protocol" was very influential |
40483095 |
650 | in the development of this system. |
651 | |
bfe4d0fc |
652 | =head2 What is a Meta Object Protocol? |
653 | |
1d68af04 |
654 | A meta object protocol is an API to an object system. |
bfe4d0fc |
655 | |
1d68af04 |
656 | To be more specific, it is a set of abstractions of the components of |
657 | an object system (typically things like; classes, object, methods, |
658 | object attributes, etc.). These abstractions can then be used to both |
bfe4d0fc |
659 | inspect and manipulate the object system which they describe. |
660 | |
1d68af04 |
661 | It can be said that there are two MOPs for any object system; the |
662 | implicit MOP, and the explicit MOP. The implicit MOP handles things |
663 | like method dispatch or inheritance, which happen automatically as |
664 | part of how the object system works. The explicit MOP typically |
665 | handles the introspection/reflection features of the object system. |
666 | All object systems have implicit MOPs, without one, they would not |
667 | work. Explict MOPs however as less common, and depending on the |
668 | language can vary from restrictive (Reflection in Java or C#) to |
669 | wide open (CLOS is a perfect example). |
bfe4d0fc |
670 | |
e16da3e6 |
671 | =head2 Yet Another Class Builder!! Why? |
672 | |
1d68af04 |
673 | This is B<not> a class builder so much as it is a I<class builder |
674 | B<builder>>. My intent is that an end user does not use this module |
675 | directly, but instead this module is used by module authors to |
676 | build extensions and features onto the Perl 5 object system. |
e16da3e6 |
677 | |
94b19069 |
678 | =head2 Who is this module for? |
679 | |
1d68af04 |
680 | This module is specifically for anyone who has ever created or |
681 | wanted to create a module for the Class:: namespace. The tools which |
682 | this module will provide will hopefully make it easier to do more |
683 | complex things with Perl 5 classes by removing such barriers as |
684 | the need to hack the symbol tables, or understand the fine details |
685 | of method dispatch. |
94b19069 |
686 | |
bfe4d0fc |
687 | =head2 What changes do I have to make to use this module? |
688 | |
1d68af04 |
689 | This module was designed to be as unintrusive as possible. Many of |
690 | its features are accessible without B<any> change to your existsing |
691 | code at all. It is meant to be a compliment to your existing code and |
692 | not an intrusion on your code base. Unlike many other B<Class::> |
693 | modules, this module B<does not> require you subclass it, or even that |
694 | you C<use> it in within your module's package. |
bfe4d0fc |
695 | |
1d68af04 |
696 | The only features which requires additions to your code are the |
2eb717d5 |
697 | attribute handling and instance construction features, and these are |
1d68af04 |
698 | both completely optional features. The only reason for this is because |
699 | Perl 5's object system does not actually have these features built |
2eb717d5 |
700 | in. More information about this feature can be found below. |
bfe4d0fc |
701 | |
702 | =head2 A Note about Performance? |
703 | |
1d68af04 |
704 | It is a common misconception that explict MOPs are performance drains. |
705 | But this is not a universal truth at all, it is an side-effect of |
706 | specific implementations. For instance, using Java reflection is much |
707 | slower because the JVM cannot take advantage of any compiler |
708 | optimizations, and the JVM has to deal with much more runtime type |
709 | information as well. Reflection in C# is marginally better as it was |
710 | designed into the language and runtime (the CLR). In contrast, CLOS |
711 | (the Common Lisp Object System) was built to support an explicit MOP, |
712 | and so performance is tuned for it. |
713 | |
714 | This library in particular does it's absolute best to avoid putting |
715 | B<any> drain at all upon your code's performance. In fact, by itself |
716 | it does nothing to affect your existing code. So you only pay for |
2eb717d5 |
717 | what you actually use. |
bfe4d0fc |
718 | |
550d56db |
719 | =head2 About Metaclass compatibility |
720 | |
1d68af04 |
721 | This module makes sure that all metaclasses created are both upwards |
722 | and downwards compatible. The topic of metaclass compatibility is |
723 | highly esoteric and is something only encountered when doing deep and |
724 | involved metaclass hacking. There are two basic kinds of metaclass |
725 | incompatibility; upwards and downwards. |
550d56db |
726 | |
1d68af04 |
727 | Upwards metaclass compatibility means that the metaclass of a |
728 | given class is either the same as (or a subclass of) all of the |
550d56db |
729 | class's ancestors. |
730 | |
1d68af04 |
731 | Downward metaclass compatibility means that the metaclasses of a |
732 | given class's anscestors are all either the same as (or a subclass |
550d56db |
733 | of) that metaclass. |
734 | |
1d68af04 |
735 | Here is a diagram showing a set of two classes (C<A> and C<B>) and |
736 | two metaclasses (C<Meta::A> and C<Meta::B>) which have correct |
550d56db |
737 | metaclass compatibility both upwards and downwards. |
738 | |
739 | +---------+ +---------+ |
740 | | Meta::A |<----| Meta::B | <....... (instance of ) |
1d68af04 |
741 | +---------+ +---------+ <------- (inherits from) |
550d56db |
742 | ^ ^ |
743 | : : |
744 | +---------+ +---------+ |
745 | | A |<----| B | |
746 | +---------+ +---------+ |
747 | |
1d68af04 |
748 | As I said this is a highly esoteric topic and one you will only run |
749 | into if you do a lot of subclassing of B<Class::MOP::Class>. If you |
750 | are interested in why this is an issue see the paper |
751 | I<Uniform and safe metaclass composition> linked to in the |
550d56db |
752 | L<SEE ALSO> section of this document. |
753 | |
aa448b16 |
754 | =head2 Using custom metaclasses |
755 | |
1d68af04 |
756 | Always use the metaclass pragma when using a custom metaclass, this |
757 | will ensure the proper initialization order and not accidentely |
758 | create an incorrect type of metaclass for you. This is a very rare |
759 | problem, and one which can only occur if you are doing deep metaclass |
aa448b16 |
760 | programming. So in other words, don't worry about it. |
761 | |
94b19069 |
762 | =head1 PROTOCOLS |
763 | |
127d39a7 |
764 | The protocol is divided into 4 main sub-protocols: |
94b19069 |
765 | |
766 | =over 4 |
767 | |
768 | =item The Class protocol |
769 | |
1d68af04 |
770 | This provides a means of manipulating and introspecting a Perl 5 |
771 | class. It handles all of symbol table hacking for you, and provides |
94b19069 |
772 | a rich set of methods that go beyond simple package introspection. |
773 | |
552e3d24 |
774 | See L<Class::MOP::Class> for more details. |
775 | |
94b19069 |
776 | =item The Attribute protocol |
777 | |
1d68af04 |
778 | This provides a consistent represenation for an attribute of a |
779 | Perl 5 class. Since there are so many ways to create and handle |
127d39a7 |
780 | attributes in Perl 5 OO, this attempts to provide as much of a |
1d68af04 |
781 | unified approach as possible, while giving the freedom and |
94b19069 |
782 | flexibility to subclass for specialization. |
783 | |
552e3d24 |
784 | See L<Class::MOP::Attribute> for more details. |
785 | |
94b19069 |
786 | =item The Method protocol |
787 | |
1d68af04 |
788 | This provides a means of manipulating and introspecting methods in |
789 | the Perl 5 object system. As with attributes, there are many ways to |
790 | approach this topic, so we try to keep it pretty basic, while still |
94b19069 |
791 | making it possible to extend the system in many ways. |
792 | |
552e3d24 |
793 | See L<Class::MOP::Method> for more details. |
94b19069 |
794 | |
127d39a7 |
795 | =item The Instance protocol |
796 | |
797 | This provides a layer of abstraction for creating object instances. |
798 | Since the other layers use this protocol, it is relatively easy to |
799 | change the type of your instances from the default HASH ref to other |
800 | types of references. Several examples are provided in the F<examples/> |
801 | directory included in this distribution. |
802 | |
803 | See L<Class::MOP::Instance> for more details. |
804 | |
94b19069 |
805 | =back |
806 | |
be7677c7 |
807 | =head1 FUNCTIONS |
808 | |
c1d5345a |
809 | =head2 Constants |
810 | |
811 | =over 4 |
812 | |
813 | =item I<IS_RUNNING_ON_5_10> |
814 | |
815 | We set this constant depending on what version perl we are on, this |
816 | allows us to take advantage of new 5.10 features and stay backwards |
817 | compat. |
818 | |
9efe16ca |
819 | =item I<HAVE_ISAREV> |
820 | |
821 | Whether or not C<mro> provides C<get_isarev>, a much faster way to get all the |
822 | subclasses of a certain class. |
823 | |
c1d5345a |
824 | =back |
825 | |
448b6e55 |
826 | =head2 Utility functions |
827 | |
828 | =over 4 |
829 | |
830 | =item B<load_class ($class_name)> |
831 | |
1d68af04 |
832 | This will load a given C<$class_name> and if it does not have an |
448b6e55 |
833 | already initialized metaclass, then it will intialize one for it. |
127d39a7 |
834 | This function can be used in place of tricks like |
835 | C<eval "use $module"> or using C<require>. |
448b6e55 |
836 | |
837 | =item B<is_class_loaded ($class_name)> |
838 | |
1d68af04 |
839 | This will return a boolean depending on if the C<$class_name> has |
840 | been loaded. |
448b6e55 |
841 | |
1d68af04 |
842 | NOTE: This does a basic check of the symbol table to try and |
448b6e55 |
843 | determine as best it can if the C<$class_name> is loaded, it |
1d68af04 |
844 | is probably correct about 99% of the time. |
448b6e55 |
845 | |
b1f5f41d |
846 | =item B<check_package_cache_flag ($pkg)> |
e0e4674a |
847 | |
127d39a7 |
848 | This will return an integer that is managed by C<Class::MOP::Class> |
849 | to determine if a module's symbol table has been altered. |
850 | |
851 | In Perl 5.10 or greater, this flag is package specific. However in |
852 | versions prior to 5.10, this will use the C<PL_sub_generation> variable |
853 | which is not package specific. |
854 | |
e0e4674a |
855 | =item B<get_code_info ($code)> |
856 | |
127d39a7 |
857 | This function returns two values, the name of the package the C<$code> |
858 | is from and the name of the C<$code> itself. This is used by several |
859 | elements of the MOP to detemine where a given C<$code> reference is from. |
860 | |
4c105333 |
861 | =item B<subname ($name, $code)> |
862 | |
863 | B<NOTE: DO NOT USE THIS FUNCTION, IT IS FOR INTERNAL USE ONLY!> |
864 | |
865 | If possible, we will load the L<Sub::Name> module and this will function |
866 | as C<Sub::Name::subname> does, otherwise it will just return the C<$code> |
867 | argument. |
868 | |
6f49cf3f |
869 | =item B<in_global_destruction> |
870 | |
871 | If L<Devel::GlobalDestruction> is available, this returns true under global |
872 | destruction. |
873 | |
874 | Otherwise it's a constant returning false. |
875 | |
448b6e55 |
876 | =back |
877 | |
878 | =head2 Metaclass cache functions |
879 | |
1d68af04 |
880 | Class::MOP holds a cache of metaclasses, the following are functions |
881 | (B<not methods>) which can be used to access that cache. It is not |
882 | recommended that you mess with this, bad things could happen. But if |
be7677c7 |
883 | you are brave and willing to risk it, go for it. |
884 | |
885 | =over 4 |
886 | |
887 | =item B<get_all_metaclasses> |
888 | |
1d68af04 |
889 | This will return an hash of all the metaclass instances that have |
890 | been cached by B<Class::MOP::Class> keyed by the package name. |
b9d9fc0b |
891 | |
be7677c7 |
892 | =item B<get_all_metaclass_instances> |
893 | |
1d68af04 |
894 | This will return an array of all the metaclass instances that have |
b9d9fc0b |
895 | been cached by B<Class::MOP::Class>. |
896 | |
be7677c7 |
897 | =item B<get_all_metaclass_names> |
898 | |
1d68af04 |
899 | This will return an array of all the metaclass names that have |
b9d9fc0b |
900 | been cached by B<Class::MOP::Class>. |
901 | |
be7677c7 |
902 | =item B<get_metaclass_by_name ($name)> |
903 | |
127d39a7 |
904 | This will return a cached B<Class::MOP::Class> instance of nothing |
905 | if no metaclass exist by that C<$name>. |
906 | |
be7677c7 |
907 | =item B<store_metaclass_by_name ($name, $meta)> |
908 | |
127d39a7 |
909 | This will store a metaclass in the cache at the supplied C<$key>. |
910 | |
be7677c7 |
911 | =item B<weaken_metaclass ($name)> |
912 | |
127d39a7 |
913 | In rare cases it is desireable to store a weakened reference in |
914 | the metaclass cache. This function will weaken the reference to |
915 | the metaclass stored in C<$name>. |
916 | |
be7677c7 |
917 | =item B<does_metaclass_exist ($name)> |
918 | |
127d39a7 |
919 | This will return true of there exists a metaclass stored in the |
920 | C<$name> key and return false otherwise. |
921 | |
be7677c7 |
922 | =item B<remove_metaclass_by_name ($name)> |
923 | |
127d39a7 |
924 | This will remove a the metaclass stored in the C<$name> key. |
925 | |
be7677c7 |
926 | =back |
927 | |
552e3d24 |
928 | =head1 SEE ALSO |
8b978dd5 |
929 | |
552e3d24 |
930 | =head2 Books |
8b978dd5 |
931 | |
1d68af04 |
932 | There are very few books out on Meta Object Protocols and Metaclasses |
933 | because it is such an esoteric topic. The following books are really |
934 | the only ones I have found. If you know of any more, B<I<please>> |
a2e85e6c |
935 | email me and let me know, I would love to hear about them. |
936 | |
8b978dd5 |
937 | =over 4 |
938 | |
552e3d24 |
939 | =item "The Art of the Meta Object Protocol" |
8b978dd5 |
940 | |
552e3d24 |
941 | =item "Advances in Object-Oriented Metalevel Architecture and Reflection" |
8b978dd5 |
942 | |
b51af7f9 |
943 | =item "Putting MetaClasses to Work" |
944 | |
a2e85e6c |
945 | =item "Smalltalk: The Language" |
946 | |
94b19069 |
947 | =back |
948 | |
550d56db |
949 | =head2 Papers |
950 | |
951 | =over 4 |
952 | |
953 | =item Uniform and safe metaclass composition |
954 | |
1d68af04 |
955 | An excellent paper by the people who brought us the original Traits paper. |
956 | This paper is on how Traits can be used to do safe metaclass composition, |
957 | and offers an excellent introduction section which delves into the topic of |
550d56db |
958 | metaclass compatibility. |
959 | |
960 | L<http://www.iam.unibe.ch/~scg/Archive/Papers/Duca05ySafeMetaclassTrait.pdf> |
961 | |
962 | =item Safe Metaclass Programming |
963 | |
1d68af04 |
964 | This paper seems to precede the above paper, and propose a mix-in based |
965 | approach as opposed to the Traits based approach. Both papers have similar |
966 | information on the metaclass compatibility problem space. |
550d56db |
967 | |
968 | L<http://citeseer.ist.psu.edu/37617.html> |
969 | |
970 | =back |
971 | |
552e3d24 |
972 | =head2 Prior Art |
8b978dd5 |
973 | |
974 | =over 4 |
975 | |
7184ca14 |
976 | =item The Perl 6 MetaModel work in the Pugs project |
8b978dd5 |
977 | |
978 | =over 4 |
979 | |
552e3d24 |
980 | =item L<http://svn.openfoundry.org/pugs/perl5/Perl6-MetaModel> |
8b978dd5 |
981 | |
552e3d24 |
982 | =item L<http://svn.openfoundry.org/pugs/perl5/Perl6-ObjectSpace> |
8b978dd5 |
983 | |
984 | =back |
985 | |
94b19069 |
986 | =back |
987 | |
1d68af04 |
988 | =head2 Articles |
f8dfcfb7 |
989 | |
990 | =over 4 |
991 | |
1d68af04 |
992 | =item CPAN Module Review of Class::MOP |
f8dfcfb7 |
993 | |
994 | L<http://www.oreillynet.com/onlamp/blog/2006/06/cpan_module_review_classmop.html> |
995 | |
996 | =back |
997 | |
a2e85e6c |
998 | =head1 SIMILAR MODULES |
999 | |
1d68af04 |
1000 | As I have said above, this module is a class-builder-builder, so it is |
1001 | not the same thing as modules like L<Class::Accessor> and |
1002 | L<Class::MethodMaker>. That being said there are very few modules on CPAN |
1003 | with similar goals to this module. The one I have found which is most |
1004 | like this module is L<Class::Meta>, although it's philosophy and the MOP it |
1005 | creates are very different from this modules. |
94b19069 |
1006 | |
a2e85e6c |
1007 | =head1 BUGS |
1008 | |
1d68af04 |
1009 | All complex software has bugs lurking in it, and this module is no |
a2e85e6c |
1010 | exception. If you find a bug please either email me, or add the bug |
1011 | to cpan-RT. |
1012 | |
1013 | =head1 ACKNOWLEDGEMENTS |
1014 | |
1015 | =over 4 |
1016 | |
b9d9fc0b |
1017 | =item Rob Kinyon |
a2e85e6c |
1018 | |
1d68af04 |
1019 | Thanks to Rob for actually getting the development of this module kick-started. |
a2e85e6c |
1020 | |
1021 | =back |
1022 | |
1a09d9cc |
1023 | =head1 AUTHORS |
94b19069 |
1024 | |
a2e85e6c |
1025 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
552e3d24 |
1026 | |
9c8cda90 |
1027 | B<with contributions from:> |
1028 | |
1029 | Brandon (blblack) Black |
1030 | |
1031 | Guillermo (groditi) Roditi |
1032 | |
9195ddff |
1033 | Matt (mst) Trout |
1034 | |
9c8cda90 |
1035 | Rob (robkinyon) Kinyon |
1036 | |
1037 | Yuval (nothingmuch) Kogman |
1a09d9cc |
1038 | |
f430cfa4 |
1039 | Scott (konobi) McWhirter |
1040 | |
94b19069 |
1041 | =head1 COPYRIGHT AND LICENSE |
1042 | |
69e3ab0a |
1043 | Copyright 2006-2008 by Infinity Interactive, Inc. |
94b19069 |
1044 | |
1045 | L<http://www.iinteractive.com> |
1046 | |
1047 | This library is free software; you can redistribute it and/or modify |
1d68af04 |
1048 | it under the same terms as Perl itself. |
94b19069 |
1049 | |
1050 | =cut |