Commit | Line | Data |
4e036ee4 |
1 | |
2 | package Moose::Meta::TypeConstraint; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | use metaclass; |
7 | |
ed90007b |
8 | use overload '0+' => sub { refaddr(shift) }, # id an object |
9 | '""' => sub { shift->name }, # stringify to tc name |
72e389bf |
10 | bool => sub { 1 }, |
b644e331 |
11 | fallback => 1; |
900466d6 |
12 | |
477a812e |
13 | use Eval::Closure; |
dabed765 |
14 | use Scalar::Util qw(blessed refaddr); |
9f2230e9 |
15 | use Sub::Name qw(subname); |
5a18346b |
16 | use Try::Tiny; |
66811d63 |
17 | |
e606ae5f |
18 | use base qw(Class::MOP::Object); |
19 | |
3726f905 |
20 | __PACKAGE__->meta->add_attribute('name' => (reader => 'name')); |
21 | __PACKAGE__->meta->add_attribute('parent' => ( |
22 | reader => 'parent', |
23 | predicate => 'has_parent', |
24 | )); |
baf26cc6 |
25 | |
26 | my $null_constraint = sub { 1 }; |
d67145ed |
27 | __PACKAGE__->meta->add_attribute('constraint' => ( |
8de73ff1 |
28 | reader => 'constraint', |
29 | writer => '_set_constraint', |
baf26cc6 |
30 | default => sub { $null_constraint } |
d67145ed |
31 | )); |
76d37e5a |
32 | __PACKAGE__->meta->add_attribute('message' => ( |
33 | accessor => 'message', |
34 | predicate => 'has_message' |
35 | )); |
92a88343 |
36 | __PACKAGE__->meta->add_attribute('_default_message' => ( |
37 | accessor => '_default_message', |
38 | )); |
39 | # can't make this a default because it has to close over the type name, and |
40 | # cmop attributes don't have lazy |
41 | my $_default_message_generator = sub { |
42 | my $name = shift; |
43 | sub { |
44 | my $value = shift; |
45 | # have to load it late like this, since it uses Moose itself |
46 | my $can_partialdump = try { |
47 | # versions prior to 0.14 had a potential infinite loop bug |
48 | Class::MOP::load_class('Devel::PartialDump', { -version => 0.14 }); |
49 | 1; |
50 | }; |
51 | if ($can_partialdump) { |
52 | $value = Devel::PartialDump->new->dump($value); |
53 | } |
54 | else { |
55 | $value = (defined $value ? overload::StrVal($value) : 'undef'); |
56 | } |
57 | return "Validation failed for '" . $name . "' with value $value"; |
58 | } |
59 | }; |
a27aa600 |
60 | __PACKAGE__->meta->add_attribute('coercion' => ( |
61 | accessor => 'coercion', |
62 | predicate => 'has_coercion' |
63 | )); |
70ea9161 |
64 | |
c8cf9aaa |
65 | __PACKAGE__->meta->add_attribute('hand_optimized_type_constraint' => ( |
66 | init_arg => 'optimized', |
67 | accessor => 'hand_optimized_type_constraint', |
e27dfc11 |
68 | predicate => 'has_hand_optimized_type_constraint', |
c8cf9aaa |
69 | )); |
70 | |
4e36cf24 |
71 | __PACKAGE__->meta->add_attribute('inlined' => ( |
7487e61c |
72 | init_arg => 'inlined', |
4e36cf24 |
73 | accessor => 'inlined', |
7487e61c |
74 | predicate => '_has_inlined_type_constraint', |
4e36cf24 |
75 | )); |
76 | |
9c44971f |
77 | __PACKAGE__->meta->add_attribute('inline_environment' => ( |
78 | init_arg => 'inline_environment', |
ca789903 |
79 | accessor => '_inline_environment', |
9c44971f |
80 | default => sub { {} }, |
81 | )); |
82 | |
bd72f3c8 |
83 | sub parents { |
84 | my $self; |
85 | $self->parent; |
86 | } |
87 | |
3726f905 |
88 | # private accessors |
89 | |
90 | __PACKAGE__->meta->add_attribute('compiled_type_constraint' => ( |
91 | accessor => '_compiled_type_constraint', |
92 | predicate => '_has_compiled_type_constraint' |
93 | )); |
22aed3c0 |
94 | __PACKAGE__->meta->add_attribute('package_defined_in' => ( |
95 | accessor => '_package_defined_in' |
96 | )); |
97 | |
e27dfc11 |
98 | sub new { |
a27aa600 |
99 | my $class = shift; |
8534c69a |
100 | my ($first, @rest) = @_; |
101 | my %args = ref $first ? %$first : $first ? ($first, @rest) : (); |
102 | $args{name} = $args{name} ? "$args{name}" : "__ANON__"; |
70ea9161 |
103 | |
8534c69a |
104 | my $self = $class->_new(%args); |
3726f905 |
105 | $self->compile_type_constraint() |
106 | unless $self->_has_compiled_type_constraint; |
92a88343 |
107 | $self->_default_message($_default_message_generator->($self->name)) |
108 | unless $self->has_message; |
66811d63 |
109 | return $self; |
110 | } |
111 | |
8534c69a |
112 | |
113 | |
70ea9161 |
114 | sub coerce { |
115 | my $self = shift; |
116 | |
117 | my $coercion = $self->coercion; |
118 | |
119 | unless ($coercion) { |
120 | require Moose; |
121 | Moose->throw_error("Cannot coerce without a type coercion"); |
122 | } |
123 | |
02679ba4 |
124 | return $_[0] if $self->check($_[0]); |
125 | |
70ea9161 |
126 | return $coercion->coerce(@_); |
127 | } |
a1257460 |
128 | |
bb6ac54a |
129 | sub assert_coerce { |
130 | my $self = shift; |
131 | |
132 | my $coercion = $self->coercion; |
133 | |
134 | unless ($coercion) { |
135 | require Moose; |
136 | Moose->throw_error("Cannot coerce without a type coercion"); |
137 | } |
138 | |
139 | return $_[0] if $self->check($_[0]); |
140 | |
141 | my $result = $coercion->coerce(@_); |
142 | |
143 | $self->assert_valid($result); |
144 | |
145 | return $result; |
146 | } |
147 | |
a1257460 |
148 | sub check { |
149 | my ($self, @args) = @_; |
150 | my $constraint_subref = $self->_compiled_type_constraint; |
151 | return $constraint_subref->(@args) ? 1 : undef; |
152 | } |
153 | |
e27dfc11 |
154 | sub validate { |
76d37e5a |
155 | my ($self, $value) = @_; |
156 | if ($self->_compiled_type_constraint->($value)) { |
157 | return undef; |
158 | } |
159 | else { |
688fcdda |
160 | $self->get_message($value); |
76d37e5a |
161 | } |
162 | } |
163 | |
7c047a36 |
164 | sub can_be_inlined { |
7487e61c |
165 | my $self = shift; |
166 | |
92efe680 |
167 | if ( $self->has_parent && $self->constraint == $null_constraint ) { |
7c047a36 |
168 | return $self->parent->can_be_inlined; |
7487e61c |
169 | } |
170 | |
171 | return $self->_has_inlined_type_constraint; |
172 | } |
173 | |
4e36cf24 |
174 | sub _inline_check { |
175 | my $self = shift; |
176 | |
7c047a36 |
177 | unless ( $self->can_be_inlined ) { |
3f9c18f3 |
178 | require Moose; |
179 | Moose->throw_error( 'Cannot inline a type constraint check for ' . $self->name ); |
180 | } |
4e36cf24 |
181 | |
92efe680 |
182 | if ( $self->has_parent && $self->constraint == $null_constraint ) { |
7487e61c |
183 | return $self->parent->_inline_check(@_); |
184 | } |
185 | |
e6fff671 |
186 | return '( do { ' . $self->inlined->( $self, @_ ) . ' } )'; |
4e36cf24 |
187 | } |
188 | |
ca789903 |
189 | sub inline_environment { |
190 | my $self = shift; |
191 | |
192 | if ( $self->has_parent && $self->constraint == $null_constraint ) { |
193 | return $self->parent->inline_environment; |
194 | } |
195 | |
196 | return $self->_inline_environment; |
197 | } |
198 | |
c24269b3 |
199 | sub assert_valid { |
200 | my ($self, $value) = @_; |
201 | |
202 | my $error = $self->validate($value); |
203 | return 1 if ! defined $error; |
204 | |
205 | require Moose; |
206 | Moose->throw_error($error); |
207 | } |
208 | |
688fcdda |
209 | sub get_message { |
210 | my ($self, $value) = @_; |
92a88343 |
211 | my $msg = $self->message || $self->_default_message; |
212 | local $_ = $value; |
213 | return $msg->($value); |
688fcdda |
214 | } |
215 | |
3726f905 |
216 | ## type predicates ... |
217 | |
d9e17f80 |
218 | sub equals { |
219 | my ( $self, $type_or_name ) = @_; |
220 | |
e606ae5f |
221 | my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name) or return; |
dabed765 |
222 | |
0677975f |
223 | return 1 if $self == $other; |
dabed765 |
224 | |
225 | if ( $self->has_hand_optimized_type_constraint and $other->has_hand_optimized_type_constraint ) { |
226 | return 1 if $self->hand_optimized_type_constraint == $other->hand_optimized_type_constraint; |
227 | } |
228 | |
229 | return unless $self->constraint == $other->constraint; |
230 | |
231 | if ( $self->has_parent ) { |
232 | return unless $other->has_parent; |
233 | return unless $self->parent->equals( $other->parent ); |
234 | } else { |
235 | return if $other->has_parent; |
236 | } |
d9e17f80 |
237 | |
05a5763c |
238 | return; |
d9e17f80 |
239 | } |
240 | |
b26e162e |
241 | sub is_a_type_of { |
d9e17f80 |
242 | my ($self, $type_or_name) = @_; |
243 | |
e606ae5f |
244 | my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name) or return; |
d9e17f80 |
245 | |
246 | ($self->equals($type) || $self->is_subtype_of($type)); |
b26e162e |
247 | } |
248 | |
cce8198b |
249 | sub is_subtype_of { |
d9e17f80 |
250 | my ($self, $type_or_name) = @_; |
251 | |
e606ae5f |
252 | my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name) or return; |
d9e17f80 |
253 | |
cce8198b |
254 | my $current = $self; |
d9e17f80 |
255 | |
cce8198b |
256 | while (my $parent = $current->parent) { |
d9e17f80 |
257 | return 1 if $parent->equals($type); |
cce8198b |
258 | $current = $parent; |
259 | } |
d9e17f80 |
260 | |
cce8198b |
261 | return 0; |
262 | } |
263 | |
3726f905 |
264 | ## compiling the type constraint |
265 | |
266 | sub compile_type_constraint { |
267 | my $self = shift; |
268 | $self->_compiled_type_constraint($self->_actually_compile_type_constraint); |
451c8248 |
269 | } |
270 | |
3726f905 |
271 | ## type compilers ... |
272 | |
273 | sub _actually_compile_type_constraint { |
274 | my $self = shift; |
e27dfc11 |
275 | |
3726f905 |
276 | return $self->_compile_hand_optimized_type_constraint |
277 | if $self->has_hand_optimized_type_constraint; |
e27dfc11 |
278 | |
7c047a36 |
279 | if ( $self->can_be_inlined ) { |
477a812e |
280 | return eval_closure( |
9c44971f |
281 | source => 'sub { ' . $self->_inline_check('$_[0]') . ' }', |
282 | environment => $self->inline_environment, |
477a812e |
283 | ); |
43837b8a |
284 | } |
285 | |
3726f905 |
286 | my $check = $self->constraint; |
70ea9161 |
287 | unless ( defined $check ) { |
288 | require Moose; |
289 | Moose->throw_error( "Could not compile type constraint '" |
e27dfc11 |
290 | . $self->name |
70ea9161 |
291 | . "' because no constraint check" ); |
292 | } |
e27dfc11 |
293 | |
3726f905 |
294 | return $self->_compile_subtype($check) |
295 | if $self->has_parent; |
e27dfc11 |
296 | |
3726f905 |
297 | return $self->_compile_type($check); |
298 | } |
299 | |
300 | sub _compile_hand_optimized_type_constraint { |
301 | my $self = shift; |
e27dfc11 |
302 | |
3726f905 |
303 | my $type_constraint = $self->hand_optimized_type_constraint; |
e27dfc11 |
304 | |
70ea9161 |
305 | unless ( ref $type_constraint ) { |
306 | require Moose; |
70ea9161 |
307 | Moose->throw_error("Hand optimized type constraint is not a code reference"); |
308 | } |
42bc21a4 |
309 | |
310 | return $type_constraint; |
3726f905 |
311 | } |
312 | |
313 | sub _compile_subtype { |
314 | my ($self, $check) = @_; |
e27dfc11 |
315 | |
baf26cc6 |
316 | # gather all the parent constraintss in order |
3726f905 |
317 | my @parents; |
baf26cc6 |
318 | my $optimized_parent; |
3726f905 |
319 | foreach my $parent ($self->_collect_all_parents) { |
baf26cc6 |
320 | # if a parent is optimized, the optimized constraint already includes |
321 | # all of its parents tcs, so we can break the loop |
3726f905 |
322 | if ($parent->has_hand_optimized_type_constraint) { |
baf26cc6 |
323 | push @parents => $optimized_parent = $parent->hand_optimized_type_constraint; |
e27dfc11 |
324 | last; |
3726f905 |
325 | } |
326 | else { |
baf26cc6 |
327 | push @parents => $parent->constraint; |
3726f905 |
328 | } |
329 | } |
e27dfc11 |
330 | |
baf26cc6 |
331 | @parents = grep { $_ != $null_constraint } reverse @parents; |
332 | |
333 | unless ( @parents ) { |
334 | return $self->_compile_type($check); |
335 | } elsif( $optimized_parent and @parents == 1 ) { |
336 | # the case of just one optimized parent is optimized to prevent |
337 | # looping and the unnecessary localization |
b5981f07 |
338 | if ( $check == $null_constraint ) { |
339 | return $optimized_parent; |
340 | } else { |
9f2230e9 |
341 | return subname($self->name, sub { |
b5981f07 |
342 | return undef unless $optimized_parent->($_[0]); |
a1257460 |
343 | my (@args) = @_; |
344 | local $_ = $args[0]; |
345 | $check->(@args); |
b5981f07 |
346 | }); |
347 | } |
baf26cc6 |
348 | } else { |
349 | # general case, check all the constraints, from the first parent to ourselves |
b5981f07 |
350 | my @checks = @parents; |
351 | push @checks, $check if $check != $null_constraint; |
9f2230e9 |
352 | return subname($self->name => sub { |
a1257460 |
353 | my (@args) = @_; |
354 | local $_ = $args[0]; |
baf26cc6 |
355 | foreach my $check (@checks) { |
a1257460 |
356 | return undef unless $check->(@args); |
baf26cc6 |
357 | } |
358 | return 1; |
359 | }); |
360 | } |
3726f905 |
361 | } |
362 | |
363 | sub _compile_type { |
364 | my ($self, $check) = @_; |
baf26cc6 |
365 | |
366 | return $check if $check == $null_constraint; # Item, Any |
367 | |
9f2230e9 |
368 | return subname($self->name => sub { |
a1257460 |
369 | my (@args) = @_; |
370 | local $_ = $args[0]; |
371 | $check->(@args); |
1b2aea39 |
372 | }); |
3726f905 |
373 | } |
374 | |
375 | ## other utils ... |
376 | |
377 | sub _collect_all_parents { |
378 | my $self = shift; |
379 | my @parents; |
380 | my $current = $self->parent; |
381 | while (defined $current) { |
382 | push @parents => $current; |
383 | $current = $current->parent; |
384 | } |
385 | return @parents; |
386 | } |
387 | |
85a9908f |
388 | sub create_child_type { |
9ceb576e |
389 | my ($self, %opts) = @_; |
390 | my $class = ref $self; |
391 | return $class->new(%opts, parent => $self); |
392 | } |
393 | |
4e036ee4 |
394 | 1; |
395 | |
ad46f524 |
396 | # ABSTRACT: The Moose Type Constraint metaclass |
397 | |
4e036ee4 |
398 | __END__ |
399 | |
400 | =pod |
401 | |
4e036ee4 |
402 | =head1 DESCRIPTION |
403 | |
cfd006f0 |
404 | This class represents a single type constraint. Moose's built-in type |
76127c77 |
405 | constraints, as well as constraints you define, are all stored in a |
cfd006f0 |
406 | L<Moose::Meta::TypeConstraint::Registry> object as objects of this |
407 | class. |
6ba6d68c |
408 | |
baf46b9e |
409 | =head1 INHERITANCE |
410 | |
411 | C<Moose::Meta::TypeConstraint> is a subclass of L<Class::MOP::Object>. |
412 | |
4e036ee4 |
413 | =head1 METHODS |
414 | |
415 | =over 4 |
416 | |
cfd006f0 |
417 | =item B<< Moose::Meta::TypeConstraint->new(%options) >> |
4e036ee4 |
418 | |
cfd006f0 |
419 | This creates a new type constraint based on the provided C<%options>: |
4e036ee4 |
420 | |
cfd006f0 |
421 | =over 8 |
d9e17f80 |
422 | |
cfd006f0 |
423 | =item * name |
e606ae5f |
424 | |
cfd006f0 |
425 | The constraint name. If a name is not provided, it will be set to |
426 | "__ANON__". |
b26e162e |
427 | |
cfd006f0 |
428 | =item * parent |
b26e162e |
429 | |
cfd006f0 |
430 | A C<Moose::Meta::TypeConstraint> object which is the parent type for |
431 | the type being created. This is optional. |
cce8198b |
432 | |
cfd006f0 |
433 | =item * constraint |
e606ae5f |
434 | |
cfd006f0 |
435 | This is the subroutine reference that implements the actual constraint |
436 | check. This defaults to a subroutine which always returns true. |
6ba6d68c |
437 | |
cfd006f0 |
438 | =item * message |
0a5bd159 |
439 | |
cfd006f0 |
440 | A subroutine reference which is used to generate an error message when |
441 | the constraint fails. This is optional. |
0a5bd159 |
442 | |
cfd006f0 |
443 | =item * coercion |
76d37e5a |
444 | |
cfd006f0 |
445 | A L<Moose::Meta::TypeCoercion> object representing the coercions to |
446 | the type. This is optional. |
76d37e5a |
447 | |
7142d232 |
448 | =item * inlined |
449 | |
450 | A subroutine which returns a string suitable for inlining this type |
451 | constraint. It will be called as a method on the type constraint object, and |
452 | will receive a single additional parameter, a variable name to be tested |
453 | (usually C<"$_"> or C<"$_[0]">. |
454 | |
455 | This is optional. |
456 | |
457 | =item * inline_environment |
458 | |
459 | A hash reference of variables to close over. The keys are variables names, and |
460 | the values are I<references> to the variables. |
461 | |
cfd006f0 |
462 | =item * optimized |
76d37e5a |
463 | |
7142d232 |
464 | B<This option is deprecated.> |
465 | |
cfd006f0 |
466 | This is a variant of the C<constraint> parameter that is somehow |
467 | optimized. Typically, this means incorporating both the type's |
468 | constraint and all of its parents' constraints into a single |
469 | subroutine reference. |
6ba6d68c |
470 | |
cfd006f0 |
471 | =back |
4e036ee4 |
472 | |
cfd006f0 |
473 | =item B<< $constraint->equals($type_name_or_object) >> |
e606ae5f |
474 | |
cfd006f0 |
475 | Returns true if the supplied name or type object is the same as the |
476 | current type. |
66811d63 |
477 | |
cfd006f0 |
478 | =item B<< $constraint->is_subtype_of($type_name_or_object) >> |
e606ae5f |
479 | |
cfd006f0 |
480 | Returns true if the supplied name or type object is a parent of the |
481 | current type. |
3726f905 |
482 | |
cfd006f0 |
483 | =item B<< $constraint->is_a_type_of($type_name_or_object) >> |
e606ae5f |
484 | |
cfd006f0 |
485 | Returns true if the given type is the same as the current type, or is |
486 | a parent of the current type. This is a shortcut for checking |
487 | C<equals> and C<is_subtype_of>. |
d9e17f80 |
488 | |
cfd006f0 |
489 | =item B<< $constraint->coerce($value) >> |
2f7e4042 |
490 | |
b2894aea |
491 | This will attempt to coerce the value to the type. If the type does not |
cfd006f0 |
492 | have any defined coercions this will throw an error. |
66811d63 |
493 | |
572b5187 |
494 | If no coercion can produce a value matching C<$constraint>, the original |
495 | value is returned. |
496 | |
086c6b6c |
497 | =item B<< $constraint->assert_coerce($value) >> |
572b5187 |
498 | |
499 | This method behaves just like C<coerce>, but if the result is not valid |
500 | according to C<$constraint>, an error is thrown. |
501 | |
cfd006f0 |
502 | =item B<< $constraint->check($value) >> |
2f7e4042 |
503 | |
cfd006f0 |
504 | Returns true if the given value passes the constraint for the type. |
76d37e5a |
505 | |
cfd006f0 |
506 | =item B<< $constraint->validate($value) >> |
2f7e4042 |
507 | |
cfd006f0 |
508 | This is similar to C<check>. However, if the type I<is valid> then the |
509 | method returns an explicit C<undef>. If the type is not valid, we call |
510 | C<< $self->get_message($value) >> internally to generate an error |
511 | message. |
76d37e5a |
512 | |
952320e0 |
513 | =item B<< $constraint->assert_valid($value) >> |
514 | |
515 | Like C<check> and C<validate>, this method checks whether C<$value> is |
516 | valid under the constraint. If it is, it will return true. If it is not, |
517 | an exception will be thrown with the results of |
518 | C<< $self->get_message($value) >>. |
519 | |
cfd006f0 |
520 | =item B<< $constraint->name >> |
2f7e4042 |
521 | |
cfd006f0 |
522 | Returns the type's name, as provided to the constructor. |
688fcdda |
523 | |
cfd006f0 |
524 | =item B<< $constraint->parent >> |
2f7e4042 |
525 | |
cfd006f0 |
526 | Returns the type's parent, as provided to the constructor, if any. |
4e036ee4 |
527 | |
cfd006f0 |
528 | =item B<< $constraint->has_parent >> |
2f7e4042 |
529 | |
cfd006f0 |
530 | Returns true if the type has a parent type. |
a27aa600 |
531 | |
cfd006f0 |
532 | =item B<< $constraint->parents >> |
2f7e4042 |
533 | |
cfd006f0 |
534 | A synonym for C<parent>. This is useful for polymorphism with types |
535 | that can have more than one parent. |
c8cf9aaa |
536 | |
cfd006f0 |
537 | =item B<< $constraint->constraint >> |
c8cf9aaa |
538 | |
cfd006f0 |
539 | Returns the type's constraint, as provided to the constructor. |
9ceb576e |
540 | |
cfd006f0 |
541 | =item B<< $constraint->get_message($value) >> |
4e036ee4 |
542 | |
cfd006f0 |
543 | This generates a method for the given value. If the type does not have |
544 | an explicit message, we generate a default message. |
3726f905 |
545 | |
cfd006f0 |
546 | =item B<< $constraint->has_message >> |
547 | |
548 | Returns true if the type has a message. |
549 | |
550 | =item B<< $constraint->message >> |
551 | |
552 | Returns the type's message as a subroutine reference. |
553 | |
554 | =item B<< $constraint->coercion >> |
555 | |
556 | Returns the type's L<Moose::Meta::TypeCoercion> object, if one |
557 | exists. |
558 | |
559 | =item B<< $constraint->has_coercion >> |
560 | |
561 | Returns true if the type has a coercion. |
562 | |
7142d232 |
563 | =item B<< $constraint->can_be_inlined >> |
564 | |
565 | Returns true if this type constraint can be inlined. A type constraint which |
566 | subtypes an inlinable constraint and does not add an additional constraint |
567 | "inherits" its parent type's inlining. |
568 | |
cfd006f0 |
569 | =item B<< $constraint->hand_optimized_type_constraint >> |
570 | |
7142d232 |
571 | B<This method is deprecated.> |
572 | |
cfd006f0 |
573 | Returns the type's hand optimized constraint, as provided to the |
574 | constructor via the C<optimized> option. |
575 | |
576 | =item B<< $constraint->has_hand_optimized_type_constraint >> |
577 | |
7142d232 |
578 | B<This method is deprecated.> |
579 | |
cfd006f0 |
580 | Returns true if the type has an optimized constraint. |
581 | |
582 | =item B<< $constraint->create_child_type(%options) >> |
451c8248 |
583 | |
cfd006f0 |
584 | This returns a new type constraint of the same class using the |
585 | provided C<%options>. The C<parent> option will be the current type. |
3726f905 |
586 | |
cfd006f0 |
587 | This method exists so that subclasses of this class can override this |
588 | behavior and change how child types are created. |
451c8248 |
589 | |
590 | =back |
591 | |
4e036ee4 |
592 | =head1 BUGS |
593 | |
d4048ef3 |
594 | See L<Moose/BUGS> for details on reporting bugs. |
4e036ee4 |
595 | |
c8cf9aaa |
596 | =cut |