Commit | Line | Data |
95bebf8c |
1 | |
2 | package Class::C3; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
95bebf8c |
7 | use Scalar::Util 'blessed'; |
2ffffc6d |
8 | use Algorithm::C3; |
95bebf8c |
9 | |
f093ecf6 |
10 | our $VERSION = '0.14'; |
d401eda1 |
11 | |
12 | # this is our global stash of both |
13 | # MRO's and method dispatch tables |
14 | # the structure basically looks like |
15 | # this: |
16 | # |
17 | # $MRO{$class} = { |
18 | # MRO => [ <class precendence list> ], |
19 | # methods => { |
20 | # orig => <original location of method>, |
21 | # code => \&<ref to original method> |
680100b1 |
22 | # }, |
23 | # has_overload_fallback => (1 | 0) |
d401eda1 |
24 | # } |
25 | # |
f7facd7b |
26 | our %MRO; |
95bebf8c |
27 | |
d0e2efe5 |
28 | # use these for debugging ... |
d401eda1 |
29 | sub _dump_MRO_table { %MRO } |
d401eda1 |
30 | our $TURN_OFF_C3 = 0; |
6262b4cf |
31 | |
32 | # state tracking for initialize()/uninitialize() |
ff168601 |
33 | our $_initialized = 0; |
d401eda1 |
34 | |
95bebf8c |
35 | sub import { |
36 | my $class = caller(); |
d401eda1 |
37 | # skip if the caller is main:: |
38 | # since that is clearly not relevant |
95bebf8c |
39 | return if $class eq 'main'; |
d401eda1 |
40 | return if $TURN_OFF_C3; |
41 | # make a note to calculate $class |
42 | # during INIT phase |
f7facd7b |
43 | $MRO{$class} = undef unless exists $MRO{$class}; |
95bebf8c |
44 | } |
45 | |
d401eda1 |
46 | ## initializers |
47 | |
d401eda1 |
48 | sub initialize { |
49 | # why bother if we don't have anything ... |
50 | return unless keys %MRO; |
ff168601 |
51 | if($_initialized) { |
52 | uninitialize(); |
53 | $MRO{$_} = undef foreach keys %MRO; |
54 | } |
d401eda1 |
55 | _calculate_method_dispatch_tables(); |
56 | _apply_method_dispatch_tables(); |
5d5c86d9 |
57 | %next::METHOD_CACHE = (); |
ff168601 |
58 | $_initialized = 1; |
d401eda1 |
59 | } |
60 | |
d0e2efe5 |
61 | sub uninitialize { |
62 | # why bother if we don't have anything ... |
63 | return unless keys %MRO; |
64 | _remove_method_dispatch_tables(); |
5d5c86d9 |
65 | %next::METHOD_CACHE = (); |
ff168601 |
66 | $_initialized = 0; |
d0e2efe5 |
67 | } |
68 | |
ff168601 |
69 | sub reinitialize { goto &initialize } |
d0e2efe5 |
70 | |
d401eda1 |
71 | ## functions for applying C3 to classes |
72 | |
73 | sub _calculate_method_dispatch_tables { |
f4a893b2 |
74 | my %merge_cache; |
95bebf8c |
75 | foreach my $class (keys %MRO) { |
f4a893b2 |
76 | _calculate_method_dispatch_table($class, \%merge_cache); |
95bebf8c |
77 | } |
d401eda1 |
78 | } |
79 | |
80 | sub _calculate_method_dispatch_table { |
f4a893b2 |
81 | my ($class, $merge_cache) = @_; |
d401eda1 |
82 | no strict 'refs'; |
f4a893b2 |
83 | my @MRO = calculateMRO($class, $merge_cache); |
d401eda1 |
84 | $MRO{$class} = { MRO => \@MRO }; |
680100b1 |
85 | my $has_overload_fallback = 0; |
d401eda1 |
86 | my %methods; |
87 | # NOTE: |
88 | # we do @MRO[1 .. $#MRO] here because it |
89 | # makes no sense to interogate the class |
90 | # which you are calculating for. |
91 | foreach my $local (@MRO[1 .. $#MRO]) { |
680100b1 |
92 | # if overload has tagged this module to |
93 | # have use "fallback", then we want to |
94 | # grab that value |
95 | $has_overload_fallback = ${"${local}::()"} |
96 | if defined ${"${local}::()"}; |
d401eda1 |
97 | foreach my $method (grep { defined &{"${local}::$_"} } keys %{"${local}::"}) { |
98 | # skip if already overriden in local class |
99 | next unless !defined *{"${class}::$method"}{CODE}; |
100 | $methods{$method} = { |
101 | orig => "${local}::$method", |
102 | code => \&{"${local}::$method"} |
103 | } unless exists $methods{$method}; |
95bebf8c |
104 | } |
d401eda1 |
105 | } |
106 | # now stash them in our %MRO table |
680100b1 |
107 | $MRO{$class}->{methods} = \%methods; |
108 | $MRO{$class}->{has_overload_fallback} = $has_overload_fallback; |
d401eda1 |
109 | } |
110 | |
111 | sub _apply_method_dispatch_tables { |
112 | foreach my $class (keys %MRO) { |
113 | _apply_method_dispatch_table($class); |
114 | } |
95bebf8c |
115 | } |
116 | |
d401eda1 |
117 | sub _apply_method_dispatch_table { |
118 | my $class = shift; |
119 | no strict 'refs'; |
680100b1 |
120 | ${"${class}::()"} = $MRO{$class}->{has_overload_fallback} |
121 | if $MRO{$class}->{has_overload_fallback}; |
d401eda1 |
122 | foreach my $method (keys %{$MRO{$class}->{methods}}) { |
123 | *{"${class}::$method"} = $MRO{$class}->{methods}->{$method}->{code}; |
124 | } |
125 | } |
126 | |
d0e2efe5 |
127 | sub _remove_method_dispatch_tables { |
128 | foreach my $class (keys %MRO) { |
129 | _remove_method_dispatch_table($class); |
130 | } |
131 | } |
132 | |
133 | sub _remove_method_dispatch_table { |
134 | my $class = shift; |
135 | no strict 'refs'; |
680100b1 |
136 | delete ${"${class}::"}{"()"} if $MRO{$class}->{has_overload_fallback}; |
d0e2efe5 |
137 | foreach my $method (keys %{$MRO{$class}->{methods}}) { |
5dd9299c |
138 | delete ${"${class}::"}{$method} |
139 | if defined *{"${class}::${method}"}{CODE} && |
140 | (*{"${class}::${method}"}{CODE} eq $MRO{$class}->{methods}->{$method}->{code}); |
d0e2efe5 |
141 | } |
142 | } |
143 | |
d401eda1 |
144 | ## functions for calculating C3 MRO |
145 | |
95bebf8c |
146 | sub calculateMRO { |
f4a893b2 |
147 | my ($class, $merge_cache) = @_; |
2ffffc6d |
148 | return Algorithm::C3::merge($class, sub { |
149 | no strict 'refs'; |
150 | @{$_[0] . '::ISA'}; |
f4a893b2 |
151 | }, $merge_cache); |
95bebf8c |
152 | } |
153 | |
5d5c86d9 |
154 | package # hide me from PAUSE |
155 | next; |
156 | |
157 | use strict; |
158 | use warnings; |
159 | |
160 | use Scalar::Util 'blessed'; |
161 | |
ac6b0914 |
162 | our $VERSION = '0.05'; |
5d5c86d9 |
163 | |
164 | our %METHOD_CACHE; |
165 | |
fa91a1c7 |
166 | sub method { |
167 | my $indirect = caller() =~ /^(?:next|maybe::next)$/; |
168 | my $level = $indirect ? 2 : 1; |
169 | |
7bb662d7 |
170 | my ($method_caller, $label, @label); |
ac6b0914 |
171 | while ($method_caller = (caller($level++))[3]) { |
7bb662d7 |
172 | @label = (split '::', $method_caller); |
173 | $label = pop @label; |
174 | last unless |
175 | $label eq '(eval)' || |
176 | $label eq '__ANON__'; |
ac6b0914 |
177 | } |
5d5c86d9 |
178 | my $caller = join '::' => @label; |
179 | my $self = $_[0]; |
180 | my $class = blessed($self) || $self; |
181 | |
fa91a1c7 |
182 | my $method = $METHOD_CACHE{"$class|$caller|$label"} ||= do { |
322a5920 |
183 | |
184 | my @MRO = Class::C3::calculateMRO($class); |
185 | |
186 | my $current; |
187 | while ($current = shift @MRO) { |
188 | last if $caller eq $current; |
189 | } |
190 | |
191 | no strict 'refs'; |
192 | my $found; |
193 | foreach my $class (@MRO) { |
194 | next if (defined $Class::C3::MRO{$class} && |
195 | defined $Class::C3::MRO{$class}{methods}{$label}); |
196 | last if (defined ($found = *{$class . '::' . $label}{CODE})); |
197 | } |
198 | |
322a5920 |
199 | $found; |
200 | }; |
fa91a1c7 |
201 | |
202 | return $method if $indirect; |
203 | |
204 | die "No next::method '$label' found for $self" if !$method; |
205 | |
206 | goto &{$method}; |
322a5920 |
207 | } |
5d5c86d9 |
208 | |
fa91a1c7 |
209 | sub can { method($_[0]) } |
5d5c86d9 |
210 | |
fa91a1c7 |
211 | package # hide me from PAUSE |
212 | maybe::next; |
213 | |
214 | use strict; |
215 | use warnings; |
216 | |
217 | our $VERSION = '0.01'; |
218 | |
219 | sub method { (next::method($_[0]) || return)->(@_) } |
5d5c86d9 |
220 | |
95bebf8c |
221 | 1; |
222 | |
223 | __END__ |
224 | |
225 | =pod |
226 | |
227 | =head1 NAME |
228 | |
229 | Class::C3 - A pragma to use the C3 method resolution order algortihm |
230 | |
231 | =head1 SYNOPSIS |
232 | |
233 | package A; |
234 | use Class::C3; |
235 | sub hello { 'A::hello' } |
236 | |
237 | package B; |
238 | use base 'A'; |
239 | use Class::C3; |
240 | |
241 | package C; |
242 | use base 'A'; |
243 | use Class::C3; |
244 | |
245 | sub hello { 'C::hello' } |
246 | |
247 | package D; |
248 | use base ('B', 'C'); |
249 | use Class::C3; |
250 | |
251 | # Classic Diamond MI pattern |
d401eda1 |
252 | # <A> |
253 | # / \ |
254 | # <B> <C> |
255 | # \ / |
256 | # <D> |
95bebf8c |
257 | |
258 | package main; |
2ffffc6d |
259 | |
260 | # initializez the C3 module |
261 | # (formerly called in INIT) |
262 | Class::C3::initialize(); |
95bebf8c |
263 | |
264 | print join ', ' => Class::C3::calculateMRO('Diamond_D') # prints D, B, C, A |
265 | |
266 | print D->hello() # prints 'C::hello' instead of the standard p5 'A::hello' |
267 | |
268 | D->can('hello')->(); # can() also works correctly |
269 | UNIVERSAL::can('D', 'hello'); # as does UNIVERSAL::can() |
270 | |
271 | =head1 DESCRIPTION |
272 | |
2ffffc6d |
273 | This is pragma to change Perl 5's standard method resolution order from depth-first left-to-right |
274 | (a.k.a - pre-order) to the more sophisticated C3 method resolution order. |
95bebf8c |
275 | |
276 | =head2 What is C3? |
277 | |
278 | C3 is the name of an algorithm which aims to provide a sane method resolution order under multiple |
279 | inheritence. It was first introduced in the langauge Dylan (see links in the L<SEE ALSO> section), |
280 | and then later adopted as the prefered MRO (Method Resolution Order) for the new-style classes in |
281 | Python 2.3. Most recently it has been adopted as the 'canonical' MRO for Perl 6 classes, and the |
282 | default MRO for Parrot objects as well. |
283 | |
284 | =head2 How does C3 work. |
285 | |
286 | C3 works by always preserving local precendence ordering. This essentially means that no class will |
287 | appear before any of it's subclasses. Take the classic diamond inheritence pattern for instance: |
288 | |
d401eda1 |
289 | <A> |
290 | / \ |
291 | <B> <C> |
292 | \ / |
293 | <D> |
95bebf8c |
294 | |
295 | The standard Perl 5 MRO would be (D, B, A, C). The result being that B<A> appears before B<C>, even |
296 | though B<C> is the subclass of B<A>. The C3 MRO algorithm however, produces the following MRO |
297 | (D, B, C, A), which does not have this same issue. |
298 | |
299 | This example is fairly trival, for more complex examples and a deeper explaination, see the links in |
300 | the L<SEE ALSO> section. |
301 | |
302 | =head2 How does this module work? |
303 | |
2ffffc6d |
304 | This module uses a technique similar to Perl 5's method caching. When C<Class::C3::initialize> is |
305 | called, this module calculates the MRO of all the classes which called C<use Class::C3>. It then |
306 | gathers information from the symbol tables of each of those classes, and builds a set of method |
307 | aliases for the correct dispatch ordering. Once all these C3-based method tables are created, it |
308 | then adds the method aliases into the local classes symbol table. |
95bebf8c |
309 | |
310 | The end result is actually classes with pre-cached method dispatch. However, this caching does not |
311 | do well if you start changing your C<@ISA> or messing with class symbol tables, so you should consider |
312 | your classes to be effectively closed. See the L<CAVEATS> section for more details. |
313 | |
d401eda1 |
314 | =head1 OPTIONAL LOWERCASE PRAGMA |
315 | |
316 | This release also includes an optional module B<c3> in the F<opt/> folder. I did not include this in |
317 | the regular install since lowercase module names are considered I<"bad"> by some people. However I |
318 | think that code looks much nicer like this: |
319 | |
320 | package MyClass; |
321 | use c3; |
322 | |
323 | The the more clunky: |
324 | |
325 | package MyClass; |
326 | use Class::C3; |
327 | |
328 | But hey, it's your choice, thats why it is optional. |
329 | |
95bebf8c |
330 | =head1 FUNCTIONS |
331 | |
332 | =over 4 |
333 | |
334 | =item B<calculateMRO ($class)> |
335 | |
336 | Given a C<$class> this will return an array of class names in the proper C3 method resolution order. |
337 | |
d401eda1 |
338 | =item B<initialize> |
339 | |
2ffffc6d |
340 | This B<must be called> to initalize the C3 method dispatch tables, this module B<will not work> if |
5f01eb5f |
341 | you do not do this. It is advised to do this as soon as possible B<after> loading any classes which |
342 | use C3. Here is a quick code example: |
343 | |
344 | package Foo; |
345 | use Class::C3; |
346 | # ... Foo methods here |
347 | |
348 | package Bar; |
349 | use Class::C3; |
350 | use base 'Foo'; |
351 | # ... Bar methods here |
352 | |
353 | package main; |
354 | |
355 | Class::C3::initialize(); # now it is safe to use Foo and Bar |
2ffffc6d |
356 | |
357 | This function used to be called automatically for you in the INIT phase of the perl compiler, but |
358 | that lead to warnings if this module was required at runtime. After discussion with my user base |
359 | (the L<DBIx::Class> folks), we decided that calling this in INIT was more of an annoyance than a |
360 | convience. I apologize to anyone this causes problems for (although i would very suprised if I had |
361 | any other users other than the L<DBIx::Class> folks). The simplest solution of course is to define |
362 | your own INIT method which calls this function. |
d401eda1 |
363 | |
364 | NOTE: |
ff168601 |
365 | |
366 | If C<initialize> detects that C<initialize> has already been executed, it will L</uninitialize> and |
367 | clear the MRO cache first. |
d0e2efe5 |
368 | |
369 | =item B<uninitialize> |
370 | |
371 | Calling this function results in the removal of all cached methods, and the restoration of the old Perl 5 |
372 | style dispatch order (depth-first, left-to-right). |
373 | |
374 | =item B<reinitialize> |
375 | |
ff168601 |
376 | This is an alias for L</initialize> above. |
d401eda1 |
377 | |
95bebf8c |
378 | =back |
379 | |
5d5c86d9 |
380 | =head1 METHOD REDISPATCHING |
381 | |
382 | It is always useful to be able to re-dispatch your method call to the "next most applicable method". This |
383 | module provides a pseudo package along the lines of C<SUPER::> or C<NEXT::> which will re-dispatch the |
384 | method along the C3 linearization. This is best show with an examples. |
385 | |
386 | # a classic diamond MI pattern ... |
387 | <A> |
388 | / \ |
389 | <B> <C> |
390 | \ / |
391 | <D> |
392 | |
393 | package A; |
394 | use c3; |
395 | sub foo { 'A::foo' } |
396 | |
397 | package B; |
398 | use base 'A'; |
399 | use c3; |
400 | sub foo { 'B::foo => ' . (shift)->next::method() } |
401 | |
402 | package B; |
403 | use base 'A'; |
404 | use c3; |
405 | sub foo { 'C::foo => ' . (shift)->next::method() } |
406 | |
407 | package D; |
408 | use base ('B', 'C'); |
409 | use c3; |
410 | sub foo { 'D::foo => ' . (shift)->next::method() } |
411 | |
412 | print D->foo; # prints out "D::foo => B::foo => C::foo => A::foo" |
413 | |
414 | A few things to note. First, we do not require you to add on the method name to the C<next::method> |
415 | call (this is unlike C<NEXT::> and C<SUPER::> which do require that). This helps to enforce the rule |
416 | that you cannot dispatch to a method of a different name (this is how C<NEXT::> behaves as well). |
417 | |
418 | The next thing to keep in mind is that you will need to pass all arguments to C<next::method> it can |
419 | not automatically use the current C<@_>. |
420 | |
322a5920 |
421 | If C<next::method> cannot find a next method to re-dispatch the call to, it will throw an exception. |
422 | You can use C<next::can> to see if C<next::method> will succeed before you call it like so: |
423 | |
424 | $self->next::method(@_) if $self->next::can; |
425 | |
fa91a1c7 |
426 | Additionally, you can use C<maybe::next::method> as a shortcut to only call the next method if it exists. |
427 | The previous example could be simply written as: |
428 | |
429 | $self->maybe::next::method(@_); |
322a5920 |
430 | |
2ffffc6d |
431 | There are some caveats about using C<next::method>, see below for those. |
95bebf8c |
432 | |
2ffffc6d |
433 | =head1 CAVEATS |
95bebf8c |
434 | |
2ffffc6d |
435 | This module used to be labeled as I<experimental>, however it has now been pretty heavily tested by |
436 | the good folks over at L<DBIx::Class> and I am confident this module is perfectly usable for |
437 | whatever your needs might be. |
95bebf8c |
438 | |
2ffffc6d |
439 | But there are still caveats, so here goes ... |
95bebf8c |
440 | |
441 | =over 4 |
442 | |
443 | =item Use of C<SUPER::>. |
444 | |
445 | The idea of C<SUPER::> under multiple inheritence is ambigious, and generally not recomended anyway. |
446 | However, it's use in conjuntion with this module is very much not recommended, and in fact very |
5d5c86d9 |
447 | discouraged. The recommended approach is to instead use the supplied C<next::method> feature, see |
448 | more details on it's usage above. |
95bebf8c |
449 | |
450 | =item Changing C<@ISA>. |
451 | |
452 | It is the author's opinion that changing C<@ISA> at runtime is pure insanity anyway. However, people |
453 | do it, so I must caveat. Any changes to the C<@ISA> will not be reflected in the MRO calculated by this |
d0e2efe5 |
454 | module, and therefor probably won't even show up. If you do this, you will need to call C<reinitialize> |
455 | in order to recalulate B<all> method dispatch tables. See the C<reinitialize> documentation and an example |
456 | in F<t/20_reinitialize.t> for more information. |
95bebf8c |
457 | |
458 | =item Adding/deleting methods from class symbol tables. |
459 | |
2ffffc6d |
460 | This module calculates the MRO for each requested class by interogatting the symbol tables of said classes. |
461 | So any symbol table manipulation which takes place after our INIT phase is run will not be reflected in |
462 | the calculated MRO. Just as with changing the C<@ISA>, you will need to call C<reinitialize> for any |
463 | changes you make to take effect. |
95bebf8c |
464 | |
2ffffc6d |
465 | =item Calling C<next::method> from methods defined outside the class |
95bebf8c |
466 | |
2ffffc6d |
467 | There is an edge case when using C<next::method> from within a subroutine which was created in a different |
468 | module than the one it is called from. It sounds complicated, but it really isn't. Here is an example which |
469 | will not work correctly: |
15eeb546 |
470 | |
2ffffc6d |
471 | *Foo::foo = sub { (shift)->next::method(@_) }; |
472 | |
473 | The problem exists because the anonymous subroutine being assigned to the glob C<*Foo::foo> will show up |
474 | in the call stack as being called C<__ANON__> and not C<foo> as you might expect. Since C<next::method> |
475 | uses C<caller> to find the name of the method it was called in, it will fail in this case. |
15eeb546 |
476 | |
2ffffc6d |
477 | But fear not, there is a simple solution. The module C<Sub::Name> will reach into the perl internals and |
478 | assign a name to an anonymous subroutine for you. Simply do this: |
479 | |
480 | use Sub::Name 'subname'; |
481 | *Foo::foo = subname 'Foo::foo' => sub { (shift)->next::method(@_) }; |
15eeb546 |
482 | |
2ffffc6d |
483 | and things will Just Work. Of course this is not always possible to do, but to be honest, I just can't |
484 | manage to find a workaround for it, so until someone gives me a working patch this will be a known |
485 | limitation of this module. |
15eeb546 |
486 | |
5d5c86d9 |
487 | =back |
15eeb546 |
488 | |
5d5c86d9 |
489 | =head1 CODE COVERAGE |
15eeb546 |
490 | |
ac6b0914 |
491 | I use B<Devel::Cover> to test the code coverage of my tests, below is the B<Devel::Cover> report on this |
492 | module's test suite. |
5d5c86d9 |
493 | |
494 | ---------------------------- ------ ------ ------ ------ ------ ------ ------ |
495 | File stmt bran cond sub pod time total |
496 | ---------------------------- ------ ------ ------ ------ ------ ------ ------ |
58f0eafe |
497 | Class/C3.pm 98.3 84.4 80.0 96.2 100.0 98.4 94.4 |
5d5c86d9 |
498 | ---------------------------- ------ ------ ------ ------ ------ ------ ------ |
58f0eafe |
499 | Total 98.3 84.4 80.0 96.2 100.0 98.4 94.4 |
5d5c86d9 |
500 | ---------------------------- ------ ------ ------ ------ ------ ------ ------ |
15eeb546 |
501 | |
95bebf8c |
502 | =head1 SEE ALSO |
503 | |
504 | =head2 The original Dylan paper |
505 | |
506 | =over 4 |
507 | |
508 | =item L<http://www.webcom.com/haahr/dylan/linearization-oopsla96.html> |
509 | |
510 | =back |
511 | |
512 | =head2 The prototype Perl 6 Object Model uses C3 |
513 | |
514 | =over 4 |
515 | |
516 | =item L<http://svn.openfoundry.org/pugs/perl5/Perl6-MetaModel/> |
517 | |
518 | =back |
519 | |
520 | =head2 Parrot now uses C3 |
521 | |
522 | =over 4 |
523 | |
524 | =item L<http://aspn.activestate.com/ASPN/Mail/Message/perl6-internals/2746631> |
525 | |
526 | =item L<http://use.perl.org/~autrijus/journal/25768> |
527 | |
528 | =back |
529 | |
530 | =head2 Python 2.3 MRO related links |
531 | |
532 | =over 4 |
533 | |
534 | =item L<http://www.python.org/2.3/mro.html> |
535 | |
536 | =item L<http://www.python.org/2.2.2/descrintro.html#mro> |
537 | |
538 | =back |
539 | |
540 | =head2 C3 for TinyCLOS |
541 | |
542 | =over 4 |
543 | |
544 | =item L<http://www.call-with-current-continuation.org/eggs/c3.html> |
545 | |
546 | =back |
547 | |
bad9dc59 |
548 | =head1 ACKNOWLEGEMENTS |
549 | |
550 | =over 4 |
551 | |
552 | =item Thanks to Matt S. Trout for using this module in his module L<DBIx::Class> |
553 | and finding many bugs and providing fixes. |
554 | |
555 | =item Thanks to Justin Guenther for making C<next::method> more robust by handling |
556 | calls inside C<eval> and anon-subs. |
557 | |
f480cda1 |
558 | =item Thanks to Robert Norris for adding support for C<next::can> and |
559 | C<maybe::next::method>. |
560 | |
bad9dc59 |
561 | =back |
562 | |
95bebf8c |
563 | =head1 AUTHOR |
564 | |
d401eda1 |
565 | Stevan Little, E<lt>stevan@iinteractive.comE<gt> |
95bebf8c |
566 | |
6262b4cf |
567 | Brandon L. Black, E<lt>blblack@gmail.comE<gt> |
568 | |
95bebf8c |
569 | =head1 COPYRIGHT AND LICENSE |
570 | |
08c29211 |
571 | Copyright 2005, 2006 by Infinity Interactive, Inc. |
95bebf8c |
572 | |
573 | L<http://www.iinteractive.com> |
574 | |
575 | This library is free software; you can redistribute it and/or modify |
576 | it under the same terms as Perl itself. |
577 | |
f4a893b2 |
578 | =cut |