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 | |
2a755fe8 |
51 | our $VERSION = '0.64_05'; |
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 |
107 | my $file = $class . '.pm'; |
108 | $file =~ s{::}{/}g; |
1b8d9282 |
109 | my $e = do { local $@; eval { require($file) }; $@ }; |
110 | confess "Could not load class ($class) because : $e" if $e; |
07940968 |
111 | } |
112 | |
113 | # initialize a metaclass if necessary |
448b6e55 |
114 | unless (does_metaclass_exist($class)) { |
1b8d9282 |
115 | my $e = do { local $@; eval { Class::MOP::Class->initialize($class) }; $@ }; |
116 | confess "Could not initialize class ($class) because : $e" if $e; |
448b6e55 |
117 | } |
07940968 |
118 | |
1b8d9282 |
119 | return get_metaclass_by_name($class) if defined wantarray; |
448b6e55 |
120 | } |
121 | |
122 | sub is_class_loaded { |
c1d5345a |
123 | my $class = shift; |
26fcef27 |
124 | |
125 | return 0 if ref($class) || !defined($class) || !length($class); |
126 | |
127 | # walk the symbol table tree to avoid autovififying |
128 | # \*{${main::}{"Foo::"}} == \*main::Foo:: |
129 | |
130 | my $pack = \*::; |
131 | foreach my $part (split('::', $class)) { |
132 | return 0 unless exists ${$$pack}{"${part}::"}; |
133 | $pack = \*{${$$pack}{"${part}::"}}; |
c1d5345a |
134 | } |
26fcef27 |
135 | |
136 | # check for $VERSION or @ISA |
137 | return 1 if exists ${$$pack}{VERSION} |
138 | && defined *{${$$pack}{VERSION}}{SCALAR}; |
139 | return 1 if exists ${$$pack}{ISA} |
140 | && defined *{${$$pack}{ISA}}{ARRAY}; |
141 | |
142 | # check for any method |
143 | foreach ( keys %{$$pack} ) { |
144 | next if substr($_, -2, 2) eq '::'; |
d5be3722 |
145 | |
146 | my $glob = ${$$pack}{$_} || next; |
147 | |
9e275e86 |
148 | # constant subs |
d5be3722 |
149 | if ( IS_RUNNING_ON_5_10 ) { |
150 | return 1 if ref $glob eq 'SCALAR'; |
151 | } |
152 | |
153 | return 1 if defined *{$glob}{CODE}; |
26fcef27 |
154 | } |
155 | |
156 | # fail |
c1d5345a |
157 | return 0; |
448b6e55 |
158 | } |
159 | |
160 | |
aa448b16 |
161 | ## ---------------------------------------------------------------------------- |
162 | ## Setting up our environment ... |
163 | ## ---------------------------------------------------------------------------- |
1d68af04 |
164 | ## Class::MOP needs to have a few things in the global perl environment so |
aa448b16 |
165 | ## that it can operate effectively. Those things are done here. |
166 | ## ---------------------------------------------------------------------------- |
167 | |
3bf7644b |
168 | # ... nothing yet actually ;) |
8b978dd5 |
169 | |
b51af7f9 |
170 | ## ---------------------------------------------------------------------------- |
1d68af04 |
171 | ## Bootstrapping |
b51af7f9 |
172 | ## ---------------------------------------------------------------------------- |
1d68af04 |
173 | ## The code below here is to bootstrap our MOP with itself. This is also |
b51af7f9 |
174 | ## sometimes called "tying the knot". By doing this, we make it much easier |
175 | ## to extend the MOP through subclassing and such since now you can use the |
1d68af04 |
176 | ## MOP itself to extend itself. |
177 | ## |
b51af7f9 |
178 | ## Yes, I know, thats weird and insane, but it's a good thing, trust me :) |
1d68af04 |
179 | ## ---------------------------------------------------------------------------- |
727919c5 |
180 | |
1d68af04 |
181 | # We need to add in the meta-attributes here so that |
182 | # any subclass of Class::MOP::* will be able to |
727919c5 |
183 | # inherit them using &construct_instance |
184 | |
f0480c45 |
185 | ## -------------------------------------------------------- |
6d5355c3 |
186 | ## Class::MOP::Package |
727919c5 |
187 | |
6d5355c3 |
188 | Class::MOP::Package->meta->add_attribute( |
8683db0e |
189 | Class::MOP::Attribute->new('package' => ( |
b880e0de |
190 | reader => { |
1d68af04 |
191 | # NOTE: we need to do this in order |
192 | # for the instance meta-object to |
b880e0de |
193 | # not fall into meta-circular death |
1d68af04 |
194 | # |
ce2ae40f |
195 | # we just alias the original method |
1d68af04 |
196 | # rather than re-produce it here |
ce2ae40f |
197 | 'name' => \&Class::MOP::Package::name |
b880e0de |
198 | }, |
727919c5 |
199 | )) |
200 | ); |
201 | |
a5e51f0b |
202 | Class::MOP::Package->meta->add_attribute( |
8683db0e |
203 | Class::MOP::Attribute->new('namespace' => ( |
a5e51f0b |
204 | reader => { |
56dcfc1a |
205 | # NOTE: |
ce2ae40f |
206 | # we just alias the original method |
207 | # rather than re-produce it here |
208 | 'namespace' => \&Class::MOP::Package::namespace |
a5e51f0b |
209 | }, |
2e877f58 |
210 | init_arg => undef, |
c4260b45 |
211 | default => sub { \undef } |
a5e51f0b |
212 | )) |
213 | ); |
214 | |
f0480c45 |
215 | ## -------------------------------------------------------- |
216 | ## Class::MOP::Module |
217 | |
218 | # NOTE: |
1d68af04 |
219 | # yeah this is kind of stretching things a bit, |
f0480c45 |
220 | # but truthfully the version should be an attribute |
1d68af04 |
221 | # of the Module, the weirdness comes from having to |
222 | # stick to Perl 5 convention and store it in the |
223 | # $VERSION package variable. Basically if you just |
224 | # squint at it, it will look how you want it to look. |
f0480c45 |
225 | # Either as a package variable, or as a attribute of |
226 | # the metaclass, isn't abstraction great :) |
227 | |
228 | Class::MOP::Module->meta->add_attribute( |
8683db0e |
229 | Class::MOP::Attribute->new('version' => ( |
f0480c45 |
230 | reader => { |
ce2ae40f |
231 | # NOTE: |
232 | # we just alias the original method |
1d68af04 |
233 | # rather than re-produce it here |
ce2ae40f |
234 | 'version' => \&Class::MOP::Module::version |
f0480c45 |
235 | }, |
2e877f58 |
236 | init_arg => undef, |
c4260b45 |
237 | default => sub { \undef } |
f0480c45 |
238 | )) |
239 | ); |
240 | |
241 | # NOTE: |
1d68af04 |
242 | # By following the same conventions as version here, |
243 | # we are opening up the possibility that people can |
244 | # use the $AUTHORITY in non-Class::MOP modules as |
245 | # well. |
f0480c45 |
246 | |
247 | Class::MOP::Module->meta->add_attribute( |
8683db0e |
248 | Class::MOP::Attribute->new('authority' => ( |
f0480c45 |
249 | reader => { |
ce2ae40f |
250 | # NOTE: |
251 | # we just alias the original method |
1d68af04 |
252 | # rather than re-produce it here |
ce2ae40f |
253 | 'authority' => \&Class::MOP::Module::authority |
1d68af04 |
254 | }, |
2e877f58 |
255 | init_arg => undef, |
c4260b45 |
256 | default => sub { \undef } |
f0480c45 |
257 | )) |
258 | ); |
259 | |
260 | ## -------------------------------------------------------- |
6d5355c3 |
261 | ## Class::MOP::Class |
262 | |
727919c5 |
263 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
264 | Class::MOP::Attribute->new('attributes' => ( |
f7259199 |
265 | reader => { |
1d68af04 |
266 | # NOTE: we need to do this in order |
267 | # for the instance meta-object to |
268 | # not fall into meta-circular death |
269 | # |
ce2ae40f |
270 | # we just alias the original method |
1d68af04 |
271 | # rather than re-produce it here |
ce2ae40f |
272 | 'get_attribute_map' => \&Class::MOP::Class::get_attribute_map |
f7259199 |
273 | }, |
727919c5 |
274 | default => sub { {} } |
275 | )) |
276 | ); |
277 | |
351bd7d4 |
278 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
279 | Class::MOP::Attribute->new('methods' => ( |
1d68af04 |
280 | reader => { |
ce2ae40f |
281 | # NOTE: |
282 | # we just alias the original method |
1d68af04 |
283 | # rather than re-produce it here |
ce2ae40f |
284 | 'get_method_map' => \&Class::MOP::Class::get_method_map |
92330ee2 |
285 | }, |
7855ddba |
286 | default => sub { {} } |
c4260b45 |
287 | )) |
288 | ); |
289 | |
290 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
291 | Class::MOP::Attribute->new('superclasses' => ( |
c23184fc |
292 | accessor => { |
293 | # NOTE: |
294 | # we just alias the original method |
1d68af04 |
295 | # rather than re-produce it here |
c23184fc |
296 | 'superclasses' => \&Class::MOP::Class::superclasses |
297 | }, |
2e877f58 |
298 | init_arg => undef, |
c23184fc |
299 | default => sub { \undef } |
300 | )) |
301 | ); |
302 | |
303 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
304 | Class::MOP::Attribute->new('attribute_metaclass' => ( |
1d68af04 |
305 | reader => { |
6d2118a4 |
306 | # NOTE: |
307 | # we just alias the original method |
1d68af04 |
308 | # rather than re-produce it here |
6d2118a4 |
309 | 'attribute_metaclass' => \&Class::MOP::Class::attribute_metaclass |
1d68af04 |
310 | }, |
351bd7d4 |
311 | default => 'Class::MOP::Attribute', |
312 | )) |
313 | ); |
314 | |
315 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
316 | Class::MOP::Attribute->new('method_metaclass' => ( |
1d68af04 |
317 | reader => { |
6d2118a4 |
318 | # NOTE: |
319 | # we just alias the original method |
1d68af04 |
320 | # rather than re-produce it here |
6d2118a4 |
321 | 'method_metaclass' => \&Class::MOP::Class::method_metaclass |
322 | }, |
1d68af04 |
323 | default => 'Class::MOP::Method', |
351bd7d4 |
324 | )) |
325 | ); |
326 | |
2bab2be6 |
327 | Class::MOP::Class->meta->add_attribute( |
8683db0e |
328 | Class::MOP::Attribute->new('instance_metaclass' => ( |
b880e0de |
329 | reader => { |
1d68af04 |
330 | # NOTE: we need to do this in order |
331 | # for the instance meta-object to |
332 | # not fall into meta-circular death |
333 | # |
ce2ae40f |
334 | # we just alias the original method |
1d68af04 |
335 | # rather than re-produce it here |
ce2ae40f |
336 | 'instance_metaclass' => \&Class::MOP::Class::instance_metaclass |
b880e0de |
337 | }, |
1d68af04 |
338 | default => 'Class::MOP::Instance', |
2bab2be6 |
339 | )) |
340 | ); |
341 | |
9d6dce77 |
342 | # NOTE: |
1d68af04 |
343 | # we don't actually need to tie the knot with |
344 | # Class::MOP::Class here, it is actually handled |
345 | # within Class::MOP::Class itself in the |
346 | # construct_class_instance method. |
9d6dce77 |
347 | |
f0480c45 |
348 | ## -------------------------------------------------------- |
727919c5 |
349 | ## Class::MOP::Attribute |
350 | |
7b31baf4 |
351 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
352 | Class::MOP::Attribute->new('name' => ( |
c23184fc |
353 | reader => { |
1d68af04 |
354 | # NOTE: we need to do this in order |
355 | # for the instance meta-object to |
356 | # not fall into meta-circular death |
357 | # |
ce2ae40f |
358 | # we just alias the original method |
1d68af04 |
359 | # rather than re-produce it here |
ce2ae40f |
360 | 'name' => \&Class::MOP::Attribute::name |
b880e0de |
361 | } |
7b31baf4 |
362 | )) |
363 | ); |
364 | |
365 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
366 | Class::MOP::Attribute->new('associated_class' => ( |
c23184fc |
367 | reader => { |
1d68af04 |
368 | # NOTE: we need to do this in order |
369 | # for the instance meta-object to |
370 | # not fall into meta-circular death |
371 | # |
ce2ae40f |
372 | # we just alias the original method |
1d68af04 |
373 | # rather than re-produce it here |
ce2ae40f |
374 | 'associated_class' => \&Class::MOP::Attribute::associated_class |
b880e0de |
375 | } |
7b31baf4 |
376 | )) |
377 | ); |
378 | |
379 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
380 | Class::MOP::Attribute->new('accessor' => ( |
6d2118a4 |
381 | reader => { 'accessor' => \&Class::MOP::Attribute::accessor }, |
382 | predicate => { 'has_accessor' => \&Class::MOP::Attribute::has_accessor }, |
7b31baf4 |
383 | )) |
384 | ); |
385 | |
386 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
387 | Class::MOP::Attribute->new('reader' => ( |
6d2118a4 |
388 | reader => { 'reader' => \&Class::MOP::Attribute::reader }, |
389 | predicate => { 'has_reader' => \&Class::MOP::Attribute::has_reader }, |
7b31baf4 |
390 | )) |
391 | ); |
392 | |
393 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
394 | Class::MOP::Attribute->new('initializer' => ( |
8ee74136 |
395 | reader => { 'initializer' => \&Class::MOP::Attribute::initializer }, |
396 | predicate => { 'has_initializer' => \&Class::MOP::Attribute::has_initializer }, |
0ab65f99 |
397 | )) |
398 | ); |
399 | |
400 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
401 | Class::MOP::Attribute->new('writer' => ( |
6d2118a4 |
402 | reader => { 'writer' => \&Class::MOP::Attribute::writer }, |
403 | predicate => { 'has_writer' => \&Class::MOP::Attribute::has_writer }, |
7b31baf4 |
404 | )) |
405 | ); |
406 | |
407 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
408 | Class::MOP::Attribute->new('predicate' => ( |
6d2118a4 |
409 | reader => { 'predicate' => \&Class::MOP::Attribute::predicate }, |
410 | predicate => { 'has_predicate' => \&Class::MOP::Attribute::has_predicate }, |
7b31baf4 |
411 | )) |
412 | ); |
413 | |
414 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
415 | Class::MOP::Attribute->new('clearer' => ( |
6d2118a4 |
416 | reader => { 'clearer' => \&Class::MOP::Attribute::clearer }, |
417 | predicate => { 'has_clearer' => \&Class::MOP::Attribute::has_clearer }, |
7d28758b |
418 | )) |
419 | ); |
420 | |
421 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
422 | Class::MOP::Attribute->new('builder' => ( |
1d68af04 |
423 | reader => { 'builder' => \&Class::MOP::Attribute::builder }, |
424 | predicate => { 'has_builder' => \&Class::MOP::Attribute::has_builder }, |
425 | )) |
426 | ); |
427 | |
428 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
429 | Class::MOP::Attribute->new('init_arg' => ( |
6d2118a4 |
430 | reader => { 'init_arg' => \&Class::MOP::Attribute::init_arg }, |
431 | predicate => { 'has_init_arg' => \&Class::MOP::Attribute::has_init_arg }, |
7b31baf4 |
432 | )) |
433 | ); |
434 | |
435 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
436 | Class::MOP::Attribute->new('default' => ( |
7b31baf4 |
437 | # default has a custom 'reader' method ... |
1d68af04 |
438 | predicate => { 'has_default' => \&Class::MOP::Attribute::has_default }, |
7b31baf4 |
439 | )) |
440 | ); |
441 | |
3545c727 |
442 | Class::MOP::Attribute->meta->add_attribute( |
8683db0e |
443 | Class::MOP::Attribute->new('associated_methods' => ( |
c23184fc |
444 | reader => { 'associated_methods' => \&Class::MOP::Attribute::associated_methods }, |
1d68af04 |
445 | default => sub { [] } |
3545c727 |
446 | )) |
447 | ); |
727919c5 |
448 | |
5659d76e |
449 | Class::MOP::Attribute->meta->add_method('clone' => sub { |
a740253a |
450 | my $self = shift; |
1d68af04 |
451 | $self->meta->clone_object($self, @_); |
727919c5 |
452 | }); |
453 | |
f0480c45 |
454 | ## -------------------------------------------------------- |
b6164407 |
455 | ## Class::MOP::Method |
b6164407 |
456 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
457 | Class::MOP::Attribute->new('body' => ( |
c23184fc |
458 | reader => { 'body' => \&Class::MOP::Method::body }, |
b6164407 |
459 | )) |
460 | ); |
461 | |
4c105333 |
462 | Class::MOP::Method->meta->add_attribute( |
5e607260 |
463 | Class::MOP::Attribute->new('associated_metaclass' => ( |
5e607260 |
464 | reader => { 'associated_metaclass' => \&Class::MOP::Method::associated_metaclass }, |
465 | )) |
466 | ); |
467 | |
468 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
469 | Class::MOP::Attribute->new('package_name' => ( |
4c105333 |
470 | reader => { 'package_name' => \&Class::MOP::Method::package_name }, |
471 | )) |
472 | ); |
473 | |
474 | Class::MOP::Method->meta->add_attribute( |
8683db0e |
475 | Class::MOP::Attribute->new('name' => ( |
4c105333 |
476 | reader => { 'name' => \&Class::MOP::Method::name }, |
477 | )) |
478 | ); |
479 | |
4c105333 |
480 | Class::MOP::Method->meta->add_method('clone' => sub { |
481 | my $self = shift; |
482 | $self->meta->clone_object($self, @_); |
483 | }); |
484 | |
b6164407 |
485 | ## -------------------------------------------------------- |
486 | ## Class::MOP::Method::Wrapped |
487 | |
488 | # NOTE: |
1d68af04 |
489 | # the way this item is initialized, this |
490 | # really does not follow the standard |
491 | # practices of attributes, but we put |
b6164407 |
492 | # it here for completeness |
493 | Class::MOP::Method::Wrapped->meta->add_attribute( |
8683db0e |
494 | Class::MOP::Attribute->new('modifier_table') |
b6164407 |
495 | ); |
496 | |
497 | ## -------------------------------------------------------- |
565f0cbb |
498 | ## Class::MOP::Method::Generated |
499 | |
500 | Class::MOP::Method::Generated->meta->add_attribute( |
8683db0e |
501 | Class::MOP::Attribute->new('is_inline' => ( |
565f0cbb |
502 | reader => { 'is_inline' => \&Class::MOP::Method::Generated::is_inline }, |
4c105333 |
503 | default => 0, |
1d68af04 |
504 | )) |
565f0cbb |
505 | ); |
506 | |
507 | ## -------------------------------------------------------- |
d90b42a6 |
508 | ## Class::MOP::Method::Accessor |
509 | |
510 | Class::MOP::Method::Accessor->meta->add_attribute( |
8683db0e |
511 | Class::MOP::Attribute->new('attribute' => ( |
1d68af04 |
512 | reader => { |
513 | 'associated_attribute' => \&Class::MOP::Method::Accessor::associated_attribute |
d90b42a6 |
514 | }, |
1d68af04 |
515 | )) |
d90b42a6 |
516 | ); |
517 | |
518 | Class::MOP::Method::Accessor->meta->add_attribute( |
8683db0e |
519 | Class::MOP::Attribute->new('accessor_type' => ( |
c23184fc |
520 | reader => { 'accessor_type' => \&Class::MOP::Method::Accessor::accessor_type }, |
1d68af04 |
521 | )) |
d90b42a6 |
522 | ); |
523 | |
d90b42a6 |
524 | ## -------------------------------------------------------- |
525 | ## Class::MOP::Method::Constructor |
526 | |
527 | Class::MOP::Method::Constructor->meta->add_attribute( |
8683db0e |
528 | Class::MOP::Attribute->new('options' => ( |
1d68af04 |
529 | reader => { |
530 | 'options' => \&Class::MOP::Method::Constructor::options |
d90b42a6 |
531 | }, |
4c105333 |
532 | default => sub { +{} } |
1d68af04 |
533 | )) |
d90b42a6 |
534 | ); |
535 | |
536 | Class::MOP::Method::Constructor->meta->add_attribute( |
8683db0e |
537 | Class::MOP::Attribute->new('associated_metaclass' => ( |
e8a38403 |
538 | init_arg => "metaclass", # FIXME alias and rename |
1d68af04 |
539 | reader => { |
540 | 'associated_metaclass' => \&Class::MOP::Method::Constructor::associated_metaclass |
541 | }, |
542 | )) |
d90b42a6 |
543 | ); |
544 | |
545 | ## -------------------------------------------------------- |
86482605 |
546 | ## Class::MOP::Instance |
547 | |
548 | # NOTE: |
1d68af04 |
549 | # these don't yet do much of anything, but are just |
86482605 |
550 | # included for completeness |
551 | |
552 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
553 | Class::MOP::Attribute->new('associated_metaclass', |
554 | reader => { associated_metaclass => \&Class::MOP::Instance::associated_metaclass }, |
555 | ), |
86482605 |
556 | ); |
557 | |
558 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
559 | Class::MOP::Attribute->new('_class_name', |
560 | init_arg => undef, |
561 | reader => { _class_name => \&Class::MOP::Instance::_class_name }, |
562 | #lazy => 1, # not yet supported by Class::MOP but out our version does it anyway |
563 | #default => sub { $_[0]->associated_metaclass->name }, |
564 | ), |
565 | ); |
566 | |
567 | Class::MOP::Instance->meta->add_attribute( |
568 | Class::MOP::Attribute->new('attributes', |
0b5d46da |
569 | reader => { attributes => \&Class::MOP::Instance::get_all_attributes }, |
74890687 |
570 | ), |
32bfc810 |
571 | ); |
572 | |
573 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
574 | Class::MOP::Attribute->new('slots', |
575 | reader => { slots => \&Class::MOP::Instance::slots }, |
576 | ), |
86482605 |
577 | ); |
578 | |
63d08a9e |
579 | Class::MOP::Instance->meta->add_attribute( |
74890687 |
580 | Class::MOP::Attribute->new('slot_hash', |
581 | reader => { slot_hash => \&Class::MOP::Instance::slot_hash }, |
582 | ), |
63d08a9e |
583 | ); |
584 | |
585 | |
caa051fa |
586 | # we need the meta instance of the meta instance to be created now, in order |
587 | # for the constructor to be able to use it |
588 | Class::MOP::Instance->meta->get_meta_instance; |
589 | |
caa051fa |
590 | # pretend the add_method never happenned. it hasn't yet affected anything |
591 | undef Class::MOP::Instance->meta->{_package_cache_flag}; |
592 | |
86482605 |
593 | ## -------------------------------------------------------- |
f0480c45 |
594 | ## Now close all the Class::MOP::* classes |
4d47b77f |
595 | |
0b9372a2 |
596 | # NOTE: |
1d68af04 |
597 | # we don't need to inline the |
598 | # constructors or the accessors |
599 | # this only lengthens the compile |
600 | # time of the MOP, and gives us |
0b9372a2 |
601 | # no actual benefits. |
602 | |
603 | $_->meta->make_immutable( |
6c2f6b5c |
604 | inline_constructor => 1, |
605 | replace_constructor => 1, |
606 | constructor_name => "_new", |
45582002 |
607 | inline_accessors => 0, |
0b9372a2 |
608 | ) for qw/ |
1d68af04 |
609 | Class::MOP::Package |
610 | Class::MOP::Module |
611 | Class::MOP::Class |
612 | |
0b9372a2 |
613 | Class::MOP::Attribute |
1d68af04 |
614 | Class::MOP::Method |
615 | Class::MOP::Instance |
616 | |
617 | Class::MOP::Object |
0b9372a2 |
618 | |
565f0cbb |
619 | Class::MOP::Method::Generated |
1d68af04 |
620 | |
ba38bf08 |
621 | Class::MOP::Method::Accessor |
1d68af04 |
622 | Class::MOP::Method::Constructor |
623 | Class::MOP::Method::Wrapped |
0b9372a2 |
624 | /; |
b6164407 |
625 | |
94b19069 |
626 | 1; |
627 | |
628 | __END__ |
629 | |
630 | =pod |
631 | |
1d68af04 |
632 | =head1 NAME |
94b19069 |
633 | |
634 | Class::MOP - A Meta Object Protocol for Perl 5 |
635 | |
94b19069 |
636 | =head1 DESCRIPTON |
637 | |
127d39a7 |
638 | This module is a fully functioning meta object protocol for the |
1d68af04 |
639 | Perl 5 object system. It makes no attempt to change the behavior or |
640 | characteristics of the Perl 5 object system, only to create a |
27e31eaf |
641 | protocol for its manipulation and introspection. |
94b19069 |
642 | |
1d68af04 |
643 | That said, it does attempt to create the tools for building a rich |
644 | set of extensions to the Perl 5 object system. Every attempt has been |
645 | made for these tools to keep to the spirit of the Perl 5 object |
94b19069 |
646 | system that we all know and love. |
647 | |
1d68af04 |
648 | This documentation is admittedly sparse on details, as time permits |
649 | I will try to improve them. For now, I suggest looking at the items |
650 | listed in the L<SEE ALSO> section for more information. In particular |
651 | the book "The Art of the Meta Object Protocol" was very influential |
40483095 |
652 | in the development of this system. |
653 | |
bfe4d0fc |
654 | =head2 What is a Meta Object Protocol? |
655 | |
1d68af04 |
656 | A meta object protocol is an API to an object system. |
bfe4d0fc |
657 | |
1d68af04 |
658 | To be more specific, it is a set of abstractions of the components of |
659 | an object system (typically things like; classes, object, methods, |
660 | object attributes, etc.). These abstractions can then be used to both |
bfe4d0fc |
661 | inspect and manipulate the object system which they describe. |
662 | |
1d68af04 |
663 | It can be said that there are two MOPs for any object system; the |
664 | implicit MOP, and the explicit MOP. The implicit MOP handles things |
665 | like method dispatch or inheritance, which happen automatically as |
666 | part of how the object system works. The explicit MOP typically |
667 | handles the introspection/reflection features of the object system. |
668 | All object systems have implicit MOPs, without one, they would not |
669 | work. Explict MOPs however as less common, and depending on the |
670 | language can vary from restrictive (Reflection in Java or C#) to |
671 | wide open (CLOS is a perfect example). |
bfe4d0fc |
672 | |
e16da3e6 |
673 | =head2 Yet Another Class Builder!! Why? |
674 | |
1d68af04 |
675 | This is B<not> a class builder so much as it is a I<class builder |
676 | B<builder>>. My intent is that an end user does not use this module |
677 | directly, but instead this module is used by module authors to |
678 | build extensions and features onto the Perl 5 object system. |
e16da3e6 |
679 | |
94b19069 |
680 | =head2 Who is this module for? |
681 | |
1d68af04 |
682 | This module is specifically for anyone who has ever created or |
683 | wanted to create a module for the Class:: namespace. The tools which |
684 | this module will provide will hopefully make it easier to do more |
685 | complex things with Perl 5 classes by removing such barriers as |
686 | the need to hack the symbol tables, or understand the fine details |
687 | of method dispatch. |
94b19069 |
688 | |
bfe4d0fc |
689 | =head2 What changes do I have to make to use this module? |
690 | |
1d68af04 |
691 | This module was designed to be as unintrusive as possible. Many of |
692 | its features are accessible without B<any> change to your existsing |
693 | code at all. It is meant to be a compliment to your existing code and |
694 | not an intrusion on your code base. Unlike many other B<Class::> |
695 | modules, this module B<does not> require you subclass it, or even that |
696 | you C<use> it in within your module's package. |
bfe4d0fc |
697 | |
1d68af04 |
698 | The only features which requires additions to your code are the |
2eb717d5 |
699 | attribute handling and instance construction features, and these are |
1d68af04 |
700 | both completely optional features. The only reason for this is because |
701 | Perl 5's object system does not actually have these features built |
2eb717d5 |
702 | in. More information about this feature can be found below. |
bfe4d0fc |
703 | |
704 | =head2 A Note about Performance? |
705 | |
1d68af04 |
706 | It is a common misconception that explict MOPs are performance drains. |
707 | But this is not a universal truth at all, it is an side-effect of |
708 | specific implementations. For instance, using Java reflection is much |
709 | slower because the JVM cannot take advantage of any compiler |
710 | optimizations, and the JVM has to deal with much more runtime type |
711 | information as well. Reflection in C# is marginally better as it was |
712 | designed into the language and runtime (the CLR). In contrast, CLOS |
713 | (the Common Lisp Object System) was built to support an explicit MOP, |
714 | and so performance is tuned for it. |
715 | |
716 | This library in particular does it's absolute best to avoid putting |
717 | B<any> drain at all upon your code's performance. In fact, by itself |
718 | it does nothing to affect your existing code. So you only pay for |
2eb717d5 |
719 | what you actually use. |
bfe4d0fc |
720 | |
550d56db |
721 | =head2 About Metaclass compatibility |
722 | |
1d68af04 |
723 | This module makes sure that all metaclasses created are both upwards |
724 | and downwards compatible. The topic of metaclass compatibility is |
725 | highly esoteric and is something only encountered when doing deep and |
726 | involved metaclass hacking. There are two basic kinds of metaclass |
727 | incompatibility; upwards and downwards. |
550d56db |
728 | |
1d68af04 |
729 | Upwards metaclass compatibility means that the metaclass of a |
730 | given class is either the same as (or a subclass of) all of the |
550d56db |
731 | class's ancestors. |
732 | |
1d68af04 |
733 | Downward metaclass compatibility means that the metaclasses of a |
734 | given class's anscestors are all either the same as (or a subclass |
550d56db |
735 | of) that metaclass. |
736 | |
1d68af04 |
737 | Here is a diagram showing a set of two classes (C<A> and C<B>) and |
738 | two metaclasses (C<Meta::A> and C<Meta::B>) which have correct |
550d56db |
739 | metaclass compatibility both upwards and downwards. |
740 | |
741 | +---------+ +---------+ |
742 | | Meta::A |<----| Meta::B | <....... (instance of ) |
1d68af04 |
743 | +---------+ +---------+ <------- (inherits from) |
550d56db |
744 | ^ ^ |
745 | : : |
746 | +---------+ +---------+ |
747 | | A |<----| B | |
748 | +---------+ +---------+ |
749 | |
1d68af04 |
750 | As I said this is a highly esoteric topic and one you will only run |
751 | into if you do a lot of subclassing of B<Class::MOP::Class>. If you |
752 | are interested in why this is an issue see the paper |
753 | I<Uniform and safe metaclass composition> linked to in the |
550d56db |
754 | L<SEE ALSO> section of this document. |
755 | |
aa448b16 |
756 | =head2 Using custom metaclasses |
757 | |
1d68af04 |
758 | Always use the metaclass pragma when using a custom metaclass, this |
759 | will ensure the proper initialization order and not accidentely |
760 | create an incorrect type of metaclass for you. This is a very rare |
761 | problem, and one which can only occur if you are doing deep metaclass |
aa448b16 |
762 | programming. So in other words, don't worry about it. |
763 | |
94b19069 |
764 | =head1 PROTOCOLS |
765 | |
127d39a7 |
766 | The protocol is divided into 4 main sub-protocols: |
94b19069 |
767 | |
768 | =over 4 |
769 | |
770 | =item The Class protocol |
771 | |
1d68af04 |
772 | This provides a means of manipulating and introspecting a Perl 5 |
773 | class. It handles all of symbol table hacking for you, and provides |
94b19069 |
774 | a rich set of methods that go beyond simple package introspection. |
775 | |
552e3d24 |
776 | See L<Class::MOP::Class> for more details. |
777 | |
94b19069 |
778 | =item The Attribute protocol |
779 | |
1d68af04 |
780 | This provides a consistent represenation for an attribute of a |
781 | Perl 5 class. Since there are so many ways to create and handle |
127d39a7 |
782 | attributes in Perl 5 OO, this attempts to provide as much of a |
1d68af04 |
783 | unified approach as possible, while giving the freedom and |
94b19069 |
784 | flexibility to subclass for specialization. |
785 | |
552e3d24 |
786 | See L<Class::MOP::Attribute> for more details. |
787 | |
94b19069 |
788 | =item The Method protocol |
789 | |
1d68af04 |
790 | This provides a means of manipulating and introspecting methods in |
791 | the Perl 5 object system. As with attributes, there are many ways to |
792 | approach this topic, so we try to keep it pretty basic, while still |
94b19069 |
793 | making it possible to extend the system in many ways. |
794 | |
552e3d24 |
795 | See L<Class::MOP::Method> for more details. |
94b19069 |
796 | |
127d39a7 |
797 | =item The Instance protocol |
798 | |
799 | This provides a layer of abstraction for creating object instances. |
800 | Since the other layers use this protocol, it is relatively easy to |
801 | change the type of your instances from the default HASH ref to other |
802 | types of references. Several examples are provided in the F<examples/> |
803 | directory included in this distribution. |
804 | |
805 | See L<Class::MOP::Instance> for more details. |
806 | |
94b19069 |
807 | =back |
808 | |
be7677c7 |
809 | =head1 FUNCTIONS |
810 | |
c1d5345a |
811 | =head2 Constants |
812 | |
813 | =over 4 |
814 | |
815 | =item I<IS_RUNNING_ON_5_10> |
816 | |
817 | We set this constant depending on what version perl we are on, this |
818 | allows us to take advantage of new 5.10 features and stay backwards |
819 | compat. |
820 | |
9efe16ca |
821 | =item I<HAVE_ISAREV> |
822 | |
823 | Whether or not C<mro> provides C<get_isarev>, a much faster way to get all the |
824 | subclasses of a certain class. |
825 | |
c1d5345a |
826 | =back |
827 | |
448b6e55 |
828 | =head2 Utility functions |
829 | |
830 | =over 4 |
831 | |
832 | =item B<load_class ($class_name)> |
833 | |
1d68af04 |
834 | This will load a given C<$class_name> and if it does not have an |
448b6e55 |
835 | already initialized metaclass, then it will intialize one for it. |
127d39a7 |
836 | This function can be used in place of tricks like |
837 | C<eval "use $module"> or using C<require>. |
448b6e55 |
838 | |
839 | =item B<is_class_loaded ($class_name)> |
840 | |
1d68af04 |
841 | This will return a boolean depending on if the C<$class_name> has |
842 | been loaded. |
448b6e55 |
843 | |
1d68af04 |
844 | NOTE: This does a basic check of the symbol table to try and |
448b6e55 |
845 | determine as best it can if the C<$class_name> is loaded, it |
1d68af04 |
846 | is probably correct about 99% of the time. |
448b6e55 |
847 | |
b1f5f41d |
848 | =item B<check_package_cache_flag ($pkg)> |
e0e4674a |
849 | |
127d39a7 |
850 | This will return an integer that is managed by C<Class::MOP::Class> |
851 | to determine if a module's symbol table has been altered. |
852 | |
853 | In Perl 5.10 or greater, this flag is package specific. However in |
854 | versions prior to 5.10, this will use the C<PL_sub_generation> variable |
855 | which is not package specific. |
856 | |
e0e4674a |
857 | =item B<get_code_info ($code)> |
858 | |
127d39a7 |
859 | This function returns two values, the name of the package the C<$code> |
860 | is from and the name of the C<$code> itself. This is used by several |
861 | elements of the MOP to detemine where a given C<$code> reference is from. |
862 | |
4c105333 |
863 | =item B<subname ($name, $code)> |
864 | |
865 | B<NOTE: DO NOT USE THIS FUNCTION, IT IS FOR INTERNAL USE ONLY!> |
866 | |
867 | If possible, we will load the L<Sub::Name> module and this will function |
868 | as C<Sub::Name::subname> does, otherwise it will just return the C<$code> |
869 | argument. |
870 | |
6f49cf3f |
871 | =item B<in_global_destruction> |
872 | |
873 | If L<Devel::GlobalDestruction> is available, this returns true under global |
874 | destruction. |
875 | |
876 | Otherwise it's a constant returning false. |
877 | |
448b6e55 |
878 | =back |
879 | |
880 | =head2 Metaclass cache functions |
881 | |
1d68af04 |
882 | Class::MOP holds a cache of metaclasses, the following are functions |
883 | (B<not methods>) which can be used to access that cache. It is not |
884 | recommended that you mess with this, bad things could happen. But if |
be7677c7 |
885 | you are brave and willing to risk it, go for it. |
886 | |
887 | =over 4 |
888 | |
889 | =item B<get_all_metaclasses> |
890 | |
1d68af04 |
891 | This will return an hash of all the metaclass instances that have |
892 | been cached by B<Class::MOP::Class> keyed by the package name. |
b9d9fc0b |
893 | |
be7677c7 |
894 | =item B<get_all_metaclass_instances> |
895 | |
1d68af04 |
896 | This will return an array of all the metaclass instances that have |
b9d9fc0b |
897 | been cached by B<Class::MOP::Class>. |
898 | |
be7677c7 |
899 | =item B<get_all_metaclass_names> |
900 | |
1d68af04 |
901 | This will return an array of all the metaclass names that have |
b9d9fc0b |
902 | been cached by B<Class::MOP::Class>. |
903 | |
be7677c7 |
904 | =item B<get_metaclass_by_name ($name)> |
905 | |
127d39a7 |
906 | This will return a cached B<Class::MOP::Class> instance of nothing |
907 | if no metaclass exist by that C<$name>. |
908 | |
be7677c7 |
909 | =item B<store_metaclass_by_name ($name, $meta)> |
910 | |
127d39a7 |
911 | This will store a metaclass in the cache at the supplied C<$key>. |
912 | |
be7677c7 |
913 | =item B<weaken_metaclass ($name)> |
914 | |
127d39a7 |
915 | In rare cases it is desireable to store a weakened reference in |
916 | the metaclass cache. This function will weaken the reference to |
917 | the metaclass stored in C<$name>. |
918 | |
be7677c7 |
919 | =item B<does_metaclass_exist ($name)> |
920 | |
127d39a7 |
921 | This will return true of there exists a metaclass stored in the |
922 | C<$name> key and return false otherwise. |
923 | |
be7677c7 |
924 | =item B<remove_metaclass_by_name ($name)> |
925 | |
127d39a7 |
926 | This will remove a the metaclass stored in the C<$name> key. |
927 | |
be7677c7 |
928 | =back |
929 | |
552e3d24 |
930 | =head1 SEE ALSO |
8b978dd5 |
931 | |
552e3d24 |
932 | =head2 Books |
8b978dd5 |
933 | |
1d68af04 |
934 | There are very few books out on Meta Object Protocols and Metaclasses |
935 | because it is such an esoteric topic. The following books are really |
936 | the only ones I have found. If you know of any more, B<I<please>> |
a2e85e6c |
937 | email me and let me know, I would love to hear about them. |
938 | |
8b978dd5 |
939 | =over 4 |
940 | |
552e3d24 |
941 | =item "The Art of the Meta Object Protocol" |
8b978dd5 |
942 | |
552e3d24 |
943 | =item "Advances in Object-Oriented Metalevel Architecture and Reflection" |
8b978dd5 |
944 | |
b51af7f9 |
945 | =item "Putting MetaClasses to Work" |
946 | |
a2e85e6c |
947 | =item "Smalltalk: The Language" |
948 | |
94b19069 |
949 | =back |
950 | |
550d56db |
951 | =head2 Papers |
952 | |
953 | =over 4 |
954 | |
955 | =item Uniform and safe metaclass composition |
956 | |
1d68af04 |
957 | An excellent paper by the people who brought us the original Traits paper. |
958 | This paper is on how Traits can be used to do safe metaclass composition, |
959 | and offers an excellent introduction section which delves into the topic of |
550d56db |
960 | metaclass compatibility. |
961 | |
962 | L<http://www.iam.unibe.ch/~scg/Archive/Papers/Duca05ySafeMetaclassTrait.pdf> |
963 | |
964 | =item Safe Metaclass Programming |
965 | |
1d68af04 |
966 | This paper seems to precede the above paper, and propose a mix-in based |
967 | approach as opposed to the Traits based approach. Both papers have similar |
968 | information on the metaclass compatibility problem space. |
550d56db |
969 | |
970 | L<http://citeseer.ist.psu.edu/37617.html> |
971 | |
972 | =back |
973 | |
552e3d24 |
974 | =head2 Prior Art |
8b978dd5 |
975 | |
976 | =over 4 |
977 | |
7184ca14 |
978 | =item The Perl 6 MetaModel work in the Pugs project |
8b978dd5 |
979 | |
980 | =over 4 |
981 | |
552e3d24 |
982 | =item L<http://svn.openfoundry.org/pugs/perl5/Perl6-MetaModel> |
8b978dd5 |
983 | |
552e3d24 |
984 | =item L<http://svn.openfoundry.org/pugs/perl5/Perl6-ObjectSpace> |
8b978dd5 |
985 | |
986 | =back |
987 | |
94b19069 |
988 | =back |
989 | |
1d68af04 |
990 | =head2 Articles |
f8dfcfb7 |
991 | |
992 | =over 4 |
993 | |
1d68af04 |
994 | =item CPAN Module Review of Class::MOP |
f8dfcfb7 |
995 | |
996 | L<http://www.oreillynet.com/onlamp/blog/2006/06/cpan_module_review_classmop.html> |
997 | |
998 | =back |
999 | |
a2e85e6c |
1000 | =head1 SIMILAR MODULES |
1001 | |
1d68af04 |
1002 | As I have said above, this module is a class-builder-builder, so it is |
1003 | not the same thing as modules like L<Class::Accessor> and |
1004 | L<Class::MethodMaker>. That being said there are very few modules on CPAN |
1005 | with similar goals to this module. The one I have found which is most |
1006 | like this module is L<Class::Meta>, although it's philosophy and the MOP it |
1007 | creates are very different from this modules. |
94b19069 |
1008 | |
a2e85e6c |
1009 | =head1 BUGS |
1010 | |
1d68af04 |
1011 | All complex software has bugs lurking in it, and this module is no |
a2e85e6c |
1012 | exception. If you find a bug please either email me, or add the bug |
1013 | to cpan-RT. |
1014 | |
1015 | =head1 ACKNOWLEDGEMENTS |
1016 | |
1017 | =over 4 |
1018 | |
b9d9fc0b |
1019 | =item Rob Kinyon |
a2e85e6c |
1020 | |
1d68af04 |
1021 | Thanks to Rob for actually getting the development of this module kick-started. |
a2e85e6c |
1022 | |
1023 | =back |
1024 | |
1a09d9cc |
1025 | =head1 AUTHORS |
94b19069 |
1026 | |
a2e85e6c |
1027 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
552e3d24 |
1028 | |
9c8cda90 |
1029 | B<with contributions from:> |
1030 | |
1031 | Brandon (blblack) Black |
1032 | |
1033 | Guillermo (groditi) Roditi |
1034 | |
9195ddff |
1035 | Matt (mst) Trout |
1036 | |
9c8cda90 |
1037 | Rob (robkinyon) Kinyon |
1038 | |
1039 | Yuval (nothingmuch) Kogman |
1a09d9cc |
1040 | |
f430cfa4 |
1041 | Scott (konobi) McWhirter |
1042 | |
94b19069 |
1043 | =head1 COPYRIGHT AND LICENSE |
1044 | |
69e3ab0a |
1045 | Copyright 2006-2008 by Infinity Interactive, Inc. |
94b19069 |
1046 | |
1047 | L<http://www.iinteractive.com> |
1048 | |
1049 | This library is free software; you can redistribute it and/or modify |
1d68af04 |
1050 | it under the same terms as Perl itself. |
94b19069 |
1051 | |
1052 | =cut |