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1 | package Mouse::Util; |
2 | use strict; |
3 | use warnings; |
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4 | |
5 | use Exporter; |
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6 | |
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7 | use Carp qw(confess); |
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8 | use B (); |
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9 | |
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10 | use constant _MOUSE_VERBOSE => !!$ENV{MOUSE_VERBOSE}; |
11 | |
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12 | our @ISA = qw(Exporter); |
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13 | our @EXPORT_OK = qw( |
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14 | find_meta |
15 | does_role |
16 | resolve_metaclass_alias |
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17 | apply_all_roles |
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18 | english_list |
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19 | |
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20 | load_class |
21 | is_class_loaded |
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22 | |
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23 | get_linear_isa |
24 | get_code_info |
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25 | |
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26 | get_code_package |
27 | |
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28 | not_supported |
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29 | |
30 | does meta dump |
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31 | _MOUSE_VERBOSE |
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32 | ); |
33 | our %EXPORT_TAGS = ( |
34 | all => \@EXPORT_OK, |
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35 | meta => [qw(does meta dump _MOUSE_VERBOSE)], |
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36 | ); |
37 | |
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38 | # aliases as public APIs |
39 | |
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40 | # it must be 'require', because Mouse::Meta::Module depends on Mouse::Util |
41 | require Mouse::Meta::Module; # for the entities of metaclass cache utilities |
42 | |
43 | BEGIN { |
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44 | *class_of = \&Mouse::Meta::Module::class_of; |
45 | *get_metaclass_by_name = \&Mouse::Meta::Module::get_metaclass_by_name; |
46 | *get_all_metaclass_instances = \&Mouse::Meta::Module::get_all_metaclass_instances; |
47 | *get_all_metaclass_names = \&Mouse::Meta::Module::get_all_metaclass_names; |
48 | } |
49 | |
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50 | # Moose::Util compatible utilities |
51 | |
52 | sub find_meta{ |
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53 | return class_of( $_[0] ); |
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54 | } |
55 | |
56 | sub does_role{ |
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57 | my ($class_or_obj, $role_name) = @_; |
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58 | |
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59 | my $meta = class_of($class_or_obj); |
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60 | |
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61 | (defined $role_name) |
62 | || ($meta || 'Mouse::Meta::Class')->throw_error("You must supply a role name to does()"); |
63 | |
64 | return defined($meta) && $meta->does_role($role_name); |
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65 | } |
66 | |
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67 | BEGIN { |
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68 | my $impl; |
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69 | if ($] >= 5.009_005) { |
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70 | require mro; |
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71 | $impl = \&mro::get_linear_isa; |
72 | } else { |
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73 | my $e = do { |
74 | local $@; |
75 | eval { require MRO::Compat }; |
76 | $@; |
f172d4e7 |
77 | }; |
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78 | if (!$e) { |
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79 | $impl = \&mro::get_linear_isa; |
80 | } else { |
81 | # VVVVV CODE TAKEN FROM MRO::COMPAT VVVVV |
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82 | my $_get_linear_isa_dfs; # this recurses so it isn't pretty |
83 | $_get_linear_isa_dfs = sub { |
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84 | no strict 'refs'; |
85 | |
86 | my $classname = shift; |
87 | |
88 | my @lin = ($classname); |
89 | my %stored; |
90 | foreach my $parent (@{"$classname\::ISA"}) { |
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91 | my $plin = $_get_linear_isa_dfs->($parent); |
92 | foreach my $p(@$plin) { |
93 | next if exists $stored{$p}; |
94 | push(@lin, $p); |
95 | $stored{$p} = 1; |
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96 | } |
97 | } |
98 | return \@lin; |
99 | }; |
100 | # ^^^^^ CODE TAKEN FROM MRO::COMPAT ^^^^^ |
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101 | $impl = $_get_linear_isa_dfs; |
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102 | } |
103 | } |
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104 | |
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105 | |
106 | no warnings 'once'; |
107 | *get_linear_isa = $impl; |
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108 | } |
109 | |
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110 | { # taken from Sub::Identify |
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111 | sub get_code_info($) { |
112 | my ($coderef) = @_; |
113 | ref($coderef) or return; |
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114 | |
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115 | my $cv = B::svref_2object($coderef); |
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116 | $cv->isa('B::CV') or return; |
117 | |
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118 | my $gv = $cv->GV; |
119 | $gv->isa('B::GV') or return; |
120 | |
121 | return ($gv->STASH->NAME, $gv->NAME); |
122 | } |
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123 | |
124 | sub get_code_package{ |
125 | my($coderef) = @_; |
126 | |
127 | my $cv = B::svref_2object($coderef); |
128 | $cv->isa('B::CV') or return ''; |
129 | |
130 | my $gv = $cv->GV; |
131 | $gv->isa('B::GV') or return ''; |
132 | |
133 | return $gv->STASH->NAME; |
134 | } |
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135 | } |
136 | |
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137 | # taken from Mouse::Util (0.90) |
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138 | { |
139 | my %cache; |
140 | |
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141 | sub resolve_metaclass_alias { |
142 | my ( $type, $metaclass_name, %options ) = @_; |
143 | |
144 | my $cache_key = $type . q{ } . ( $options{trait} ? '-Trait' : '' ); |
145 | |
146 | return $cache{$cache_key}{$metaclass_name} ||= do{ |
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147 | |
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148 | my $possible_full_name = join '::', |
149 | 'Mouse::Meta', $type, 'Custom', ($options{trait} ? 'Trait' : ()), $metaclass_name |
150 | ; |
151 | |
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152 | my $loaded_class = load_first_existing_class( |
153 | $possible_full_name, |
154 | $metaclass_name |
155 | ); |
156 | |
157 | $loaded_class->can('register_implementation') |
158 | ? $loaded_class->register_implementation |
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159 | : $loaded_class; |
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160 | }; |
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161 | } |
162 | } |
163 | |
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164 | # Utilities from Class::MOP |
165 | |
166 | |
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167 | # taken from Class/MOP.pm |
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168 | sub is_valid_class_name { |
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169 | my $class = shift; |
170 | |
171 | return 0 if ref($class); |
172 | return 0 unless defined($class); |
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173 | |
174 | return 1 if $class =~ /^\w+(?:::\w+)*$/; |
175 | |
176 | return 0; |
177 | } |
178 | |
179 | # taken from Class/MOP.pm |
180 | sub load_first_existing_class { |
181 | my @classes = @_ |
182 | or return; |
183 | |
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184 | my %exceptions; |
185 | for my $class (@classes) { |
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186 | my $e = _try_load_one_class($class); |
187 | |
188 | if ($e) { |
189 | $exceptions{$class} = $e; |
190 | } |
191 | else { |
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192 | return $class; |
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193 | } |
194 | } |
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195 | |
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196 | # not found |
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197 | confess join( |
198 | "\n", |
199 | map { |
200 | sprintf( "Could not load class (%s) because : %s", |
201 | $_, $exceptions{$_} ) |
202 | } @classes |
203 | ); |
204 | } |
205 | |
206 | # taken from Class/MOP.pm |
207 | sub _try_load_one_class { |
208 | my $class = shift; |
209 | |
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210 | unless ( is_valid_class_name($class) ) { |
211 | my $display = defined($class) ? $class : 'undef'; |
212 | confess "Invalid class name ($display)"; |
213 | } |
214 | |
215 | return if is_class_loaded($class); |
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216 | |
217 | my $file = $class . '.pm'; |
218 | $file =~ s{::}{/}g; |
219 | |
220 | return do { |
221 | local $@; |
222 | eval { require($file) }; |
223 | $@; |
224 | }; |
225 | } |
226 | |
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227 | |
228 | sub load_class { |
229 | my $class = shift; |
230 | my $e = _try_load_one_class($class); |
231 | confess "Could not load class ($class) because : $e" if $e; |
232 | |
233 | return 1; |
234 | } |
235 | |
236 | my %is_class_loaded_cache; |
237 | sub is_class_loaded { |
238 | my $class = shift; |
239 | |
240 | return 0 if ref($class) || !defined($class) || !length($class); |
241 | |
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242 | return 1 if $is_class_loaded_cache{$class}; |
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243 | |
244 | # walk the symbol table tree to avoid autovififying |
245 | # \*{${main::}{"Foo::"}} == \*main::Foo:: |
246 | |
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247 | my $pack = \%::; |
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248 | foreach my $part (split('::', $class)) { |
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249 | my $entry = \$pack->{$part . '::'}; |
250 | return 0 if ref($entry) ne 'GLOB'; |
251 | $pack = *{$entry}{HASH} or return 0; |
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252 | } |
253 | |
254 | # check for $VERSION or @ISA |
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255 | return ++$is_class_loaded_cache{$class} if exists $pack->{VERSION} |
256 | && defined *{$pack->{VERSION}}{SCALAR} && defined ${ $pack->{VERSION} }; |
257 | return ++$is_class_loaded_cache{$class} if exists $pack->{ISA} |
258 | && defined *{$pack->{ISA}}{ARRAY} && @{ $pack->{ISA} } != 0; |
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259 | |
260 | # check for any method |
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261 | foreach my $name( keys %{$pack} ) { |
262 | my $entry = \$pack->{$name}; |
263 | return ++$is_class_loaded_cache{$class} if ref($entry) ne 'GLOB' || defined *{$entry}{CODE}; |
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264 | } |
265 | |
266 | # fail |
267 | return 0; |
268 | } |
269 | |
270 | |
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271 | sub apply_all_roles { |
272 | my $meta = Mouse::Meta::Class->initialize(shift); |
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273 | |
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274 | my @roles; |
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275 | |
276 | # Basis of Data::OptList |
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277 | my $max = scalar(@_); |
278 | for (my $i = 0; $i < $max ; $i++) { |
279 | if ($i + 1 < $max && ref($_[$i + 1])) { |
280 | push @roles, [ $_[$i++] => $_[$i] ]; |
281 | } else { |
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282 | push @roles, [ $_[$i] => undef ]; |
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283 | } |
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284 | my $role_name = $roles[-1][0]; |
285 | load_class($role_name); |
286 | ( $role_name->can('meta') && $role_name->meta->isa('Mouse::Meta::Role') ) |
287 | || $meta->throw_error("You can only consume roles, $role_name(".$role_name->meta.") is not a Mouse role"); |
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288 | } |
289 | |
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290 | if ( scalar @roles == 1 ) { |
291 | my ( $role, $params ) = @{ $roles[0] }; |
292 | $role->meta->apply( $meta, ( defined $params ? %$params : () ) ); |
293 | } |
294 | else { |
295 | Mouse::Meta::Role->combine_apply($meta, @roles); |
296 | } |
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297 | return; |
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298 | } |
299 | |
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300 | # taken from Moose::Util 0.90 |
301 | sub english_list { |
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302 | return $_[0] if @_ == 1; |
303 | |
304 | my @items = sort @_; |
305 | |
306 | return "$items[0] and $items[1]" if @items == 2; |
307 | |
308 | my $tail = pop @items; |
309 | |
310 | return join q{, }, @items, "and $tail"; |
2e33bb59 |
311 | } |
312 | |
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313 | |
314 | # common utilities |
315 | |
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316 | sub not_supported{ |
317 | my($feature) = @_; |
318 | |
319 | $feature ||= ( caller(1) )[3]; # subroutine name |
320 | |
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321 | local $Carp::CarpLevel = $Carp::CarpLevel + 1; |
322 | Carp::confess("Mouse does not currently support $feature"); |
fce211ae |
323 | } |
324 | |
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325 | sub meta{ |
326 | return Mouse::Meta::Class->initialize($_[0]); |
327 | } |
328 | |
329 | sub dump { |
330 | my($self, $maxdepth) = @_; |
331 | |
332 | require 'Data/Dumper.pm'; # we don't want to create its namespace |
333 | my $dd = Data::Dumper->new([$self]); |
334 | $dd->Maxdepth(defined($maxdepth) ? $maxdepth : 2); |
335 | $dd->Indent(1); |
336 | return $dd->Dump(); |
337 | } |
338 | |
339 | sub does :method; |
340 | *does = \&does_role; # alias |
341 | |
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342 | 1; |
343 | |
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344 | __END__ |
345 | |
346 | =head1 NAME |
347 | |
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348 | Mouse::Util - Features, with or without their dependencies |
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349 | |
350 | =head1 IMPLEMENTATIONS FOR |
351 | |
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352 | =head2 Moose::Util |
353 | |
354 | =head3 C<find_meta> |
355 | |
356 | =head3 C<does_role> |
357 | |
358 | =head3 C<resolve_metaclass_alias> |
359 | |
360 | =head3 C<apply_all_roles> |
361 | |
362 | =head3 C<english_list> |
363 | |
364 | =head2 Class::MOP |
365 | |
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366 | =head3 C<< is_class_loaded(ClassName) -> Bool >> |
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367 | |
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368 | Returns whether C<ClassName> is actually loaded or not. It uses a heuristic which |
369 | involves checking for the existence of C<$VERSION>, C<@ISA>, and any |
370 | locally-defined method. |
371 | |
372 | =head3 C<< load_class(ClassName) >> |
373 | |
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374 | This will load a given C<ClassName> (or die if it is not loadable). |
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375 | This function can be used in place of tricks like |
376 | C<eval "use $module"> or using C<require>. |
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377 | |
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378 | =head2 C<< Mouse::Util::class_of(ClassName) >> |
379 | |
380 | The counterpart of C<Class::MOP::class_of()>. This is not exportable. |
381 | |
382 | =head2 C<< Mouse::Util::get_metaclass_by_name(ClassName) >> |
383 | |
384 | The counterpart of C<Class::MOP::get_metaclass_by_name()>. This is not exportable. |
385 | |
ea249879 |
386 | =head2 MRO::Compat |
387 | |
388 | =head3 C<get_linear_isa> |
389 | |
390 | =head2 Sub::Identify |
391 | |
392 | =head3 C<get_code_info> |
393 | |
394 | =head1 UTILITIES FOR MOUSE |
395 | |
bedd575c |
396 | =head3 C<not_supported> |
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397 | |
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398 | =head1 SEE ALSO |
399 | |
400 | L<Moose::Util> |
401 | |
402 | L<Scalar::Util> |
403 | |
404 | L<Sub::Identify> |
405 | |
406 | L<MRO::Compat> |
407 | |
f38ce2d0 |
408 | =cut |
409 | |