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129 | .\" ======================================================================== |
130 | .\" |
131 | .IX Title "Moose::Meta::Attribute::Native::Trait::Array 3" |
132 | .TH Moose::Meta::Attribute::Native::Trait::Array 3 "2009-11-19" "perl v5.8.7" "User Contributed Perl Documentation" |
133 | .SH "NAME" |
134 | Moose::Meta::Attribute::Native::Trait::Array \- Helper trait for ArrayRef attributes |
135 | .SH "SYNOPSIS" |
136 | .IX Header "SYNOPSIS" |
137 | .Vb 2 |
138 | \& package Stuff; |
139 | \& use Moose; |
140 | .Ve |
141 | .PP |
142 | .Vb 19 |
143 | \& has 'options' => ( |
144 | \& traits => ['Array'], |
145 | \& is => 'ro', |
146 | \& isa => 'ArrayRef[Str]', |
147 | \& default => sub { [] }, |
148 | \& handles => { |
149 | \& all_options => 'elements', |
150 | \& add_option => 'push', |
151 | \& map_options => 'map', |
152 | \& filter_options => 'grep', |
153 | \& find_option => 'first', |
154 | \& get_option => 'get', |
155 | \& join_options => 'join', |
156 | \& count_options => 'count', |
157 | \& has_options => 'count', |
158 | \& has_no_options => 'is_empty', |
159 | \& sorted_options => 'sort', |
160 | \& }, |
161 | \& ); |
162 | .Ve |
163 | .PP |
164 | .Vb 2 |
165 | \& no Moose; |
166 | \& 1; |
167 | .Ve |
168 | .SH "DESCRIPTION" |
169 | .IX Header "DESCRIPTION" |
170 | This module provides an Array attribute which provides a number of |
171 | array operations. |
172 | .SH "PROVIDED METHODS" |
173 | .IX Header "PROVIDED METHODS" |
174 | These methods are implemented in |
175 | Moose::Meta::Attribute::Native::MethodProvider::Array. |
176 | .IP "\fBcount\fR" 4 |
177 | .IX Item "count" |
178 | Returns the number of elements in the array. |
179 | .Sp |
180 | .Vb 2 |
181 | \& $stuff = Stuff\->new; |
182 | \& $stuff\->options(["foo", "bar", "baz", "boo"]); |
183 | .Ve |
184 | .Sp |
185 | .Vb 2 |
186 | \& my $count = $stuff\->count_options; |
187 | \& print "$count\en"; # prints 4 |
188 | .Ve |
189 | .IP "\fBis_empty\fR" 4 |
190 | .IX Item "is_empty" |
191 | Returns a boolean value that is true when the array has no elements. |
192 | .Sp |
193 | .Vb 1 |
194 | \& $stuff\->has_no_options ? die "No options!\en" : print "Good boy.\en"; |
195 | .Ve |
196 | .IP "\fBelements\fR" 4 |
197 | .IX Item "elements" |
198 | Returns all of the elements of the array. |
199 | .Sp |
200 | .Vb 2 |
201 | \& my @option = $stuff\->all_options; |
202 | \& print "@options\en"; # prints "foo bar baz boo" |
203 | .Ve |
204 | .IP "\fBget($index)\fR" 4 |
205 | .IX Item "get($index)" |
206 | Returns an element of the array by its index. You can also use negative index |
207 | numbers, just as with Perl's core array handling. |
208 | .Sp |
209 | .Vb 2 |
210 | \& my $option = $stuff\->get_option(1); |
211 | \& print "$option\en"; # prints "bar" |
212 | .Ve |
213 | .IP "\fBpop\fR" 4 |
214 | .IX Item "pop" |
215 | .PD 0 |
216 | .ie n .IP "\fBpush($value1, \fB$value2\fB, value3 ...)\fR" 4 |
217 | .el .IP "\fBpush($value1, \f(CB$value2\fB, value3 ...)\fR" 4 |
218 | .IX Item "push($value1, $value2, value3 ...)" |
219 | .IP "\fBshift\fR" 4 |
220 | .IX Item "shift" |
221 | .ie n .IP "\fBunshift($value1, \fB$value2\fB, value3 ...)\fR" 4 |
222 | .el .IP "\fBunshift($value1, \f(CB$value2\fB, value3 ...)\fR" 4 |
223 | .IX Item "unshift($value1, $value2, value3 ...)" |
224 | .ie n .IP "\fBsplice($offset, \fB$length\fB, \f(BI@values\fB)\fR" 4 |
225 | .el .IP "\fBsplice($offset, \f(CB$length\fB, \f(CB@values\fB)\fR" 4 |
226 | .IX Item "splice($offset, $length, @values)" |
227 | .PD |
228 | These methods are all equivalent to the Perl core functions of the same name. |
229 | .IP "\fBfirst( sub { ... } )\fR" 4 |
230 | .IX Item "first( sub { ... } )" |
231 | This method returns the first item matching item in the array, just like |
232 | List::Util's \f(CW\*(C`first\*(C'\fR function. The matching is done with a subroutine |
233 | reference you pass to this method. The reference will be called against each |
234 | element in the array until one matches or all elements have been checked. |
235 | .Sp |
236 | .Vb 2 |
237 | \& my $found = $stuff\->find_option( sub { /^b/ } ); |
238 | \& print "$found\en"; # prints "bar" |
239 | .Ve |
240 | .IP "\fBgrep( sub { ... } )\fR" 4 |
241 | .IX Item "grep( sub { ... } )" |
242 | This method returns every element matching a given criteria, just like Perl's |
243 | core \f(CW\*(C`grep\*(C'\fR function. This method requires a subroutine which implements the |
244 | matching logic. |
245 | .Sp |
246 | .Vb 2 |
247 | \& my @found = $stuff\->filter_options( sub { /^b/ } ); |
248 | \& print "@found\en"; # prints "bar baz boo" |
249 | .Ve |
250 | .IP "\fBmap( sub { ... } )\fR" 4 |
251 | .IX Item "map( sub { ... } )" |
252 | This method transforms every element in the array and returns a new array, |
253 | just like Perl's core \f(CW\*(C`map\*(C'\fR function. This method requires a subroutine which |
254 | implements the transformation. |
255 | .Sp |
256 | .Vb 2 |
257 | \& my @mod_options = $stuff\->map_options( sub { $_ . "\-tag" } ); |
258 | \& print "@mod_options\en"; # prints "foo\-tag bar\-tag baz\-tag boo\-tag" |
259 | .Ve |
260 | .IP "\fBreduce( sub { ... } )\fR" 4 |
261 | .IX Item "reduce( sub { ... } )" |
262 | This method condenses an array into a single value, by passing a function the |
263 | value so far and the next value in the array, just like List::Util's |
264 | \&\f(CW\*(C`reduce\*(C'\fR function. The reducing is done with a subroutine reference you pass |
265 | to this method. |
266 | .Sp |
267 | .Vb 2 |
268 | \& my $found = $stuff\->reduce_options( sub { $_[0] . $_[1] } ); |
269 | \& print "$found\en"; # prints "foobarbazboo" |
270 | .Ve |
271 | .IP "\fBsort( sub { ... } )\fR" 4 |
272 | .IX Item "sort( sub { ... } )" |
273 | Returns a the array in sorted order. |
274 | .Sp |
275 | You can provide an optional subroutine reference to sort with (as you can with |
276 | Perl's core \f(CW\*(C`sort\*(C'\fR function). However, instead of using \f(CW$a\fR and \f(CW$b\fR, you |
277 | will need to use \f(CW$_[0]\fR and \f(CW$_[1]\fR instead. |
278 | .Sp |
279 | .Vb 2 |
280 | \& # ascending ASCIIbetical |
281 | \& my @sorted = $stuff\->sort_options(); |
282 | .Ve |
283 | .Sp |
284 | .Vb 3 |
285 | \& # Descending alphabetical order |
286 | \& my @sorted_options = $stuff\->sort_options( sub { lc $_[1] cmp lc $_[0] } ); |
287 | \& print "@sorted_options\en"; # prints "foo boo baz bar" |
288 | .Ve |
289 | .IP "\fBsort_in_place\fR" 4 |
290 | .IX Item "sort_in_place" |
291 | Sorts the array \fIin place\fR, modifying the value of the attribute. |
292 | .Sp |
293 | You can provide an optional subroutine reference to sort with (as you can with |
294 | Perl's core \f(CW\*(C`sort\*(C'\fR function). However, instead of using \f(CW$a\fR and \f(CW$b\fR, you |
295 | will need to use \f(CW$_[0]\fR and \f(CW$_[1]\fR instead. |
296 | .IP "\fBshuffle\fR" 4 |
297 | .IX Item "shuffle" |
298 | Returns the array, with indices in random order, like \f(CW\*(C`shuffle\*(C'\fR from |
299 | List::Util. |
300 | .IP "\fBuniq\fR" 4 |
301 | .IX Item "uniq" |
302 | Returns the array, with all duplicate elements removed, like \f(CW\*(C`uniq\*(C'\fR from |
303 | List::MoreUtils. |
304 | .IP "\fBjoin($str)\fR" 4 |
305 | .IX Item "join($str)" |
306 | Joins every element of the array using the separator given as argument, just |
307 | like Perl's core \f(CW\*(C`join\*(C'\fR function. |
308 | .Sp |
309 | .Vb 2 |
310 | \& my $joined = $stuff\->join_options( ':' ); |
311 | \& print "$joined\en"; # prints "foo:bar:baz:boo" |
312 | .Ve |
313 | .ie n .IP "\fBset($index, \fB$value\fB)\fR" 4 |
314 | .el .IP "\fBset($index, \f(CB$value\fB)\fR" 4 |
315 | .IX Item "set($index, $value)" |
316 | Given an index and a value, sets the specified array element's value. |
317 | .IP "\fBdelete($index)\fR" 4 |
318 | .IX Item "delete($index)" |
319 | Removes the element at the given index from the array. |
320 | .ie n .IP "\fBinsert($index, \fB$value\fB)\fR" 4 |
321 | .el .IP "\fBinsert($index, \f(CB$value\fB)\fR" 4 |
322 | .IX Item "insert($index, $value)" |
323 | Inserts a new element into the array at the given index. |
324 | .IP "\fBclear\fR" 4 |
325 | .IX Item "clear" |
326 | Empties the entire array, like \f(CW\*(C`@array = ()\*(C'\fR. |
327 | .IP "\fBaccessor\fR" 4 |
328 | .IX Item "accessor" |
329 | This method provides a get/set accessor for the array, based on array indexes. |
330 | If passed one argument, it returns the value at the specified index. If |
331 | passed two arguments, it sets the value of the specified index. |
332 | .ie n .IP "\fBnatatime($n, \fB$code\fB)\fR" 4 |
333 | .el .IP "\fBnatatime($n, \f(CB$code\fB)\fR" 4 |
334 | .IX Item "natatime($n, $code)" |
335 | This method returns an iterator which, on each call, returns \f(CW$n\fR more items |
336 | from the array, in order, like \f(CW\*(C`natatime\*(C'\fR from List::MoreUtils. A coderef |
337 | can optionally be provided; it will be called on each group of \f(CW$n\fR elements |
338 | in the array. |
339 | .SH "METHODS" |
340 | .IX Header "METHODS" |
341 | .IP "\fBmeta\fR" 4 |
342 | .IX Item "meta" |
343 | .PD 0 |
344 | .IP "\fBmethod_provider\fR" 4 |
345 | .IX Item "method_provider" |
346 | .IP "\fBhas_method_provider\fR" 4 |
347 | .IX Item "has_method_provider" |
348 | .PD |
349 | .SH "BUGS" |
350 | .IX Header "BUGS" |
351 | All complex software has bugs lurking in it, and this module is no |
352 | exception. If you find a bug please either email me, or add the bug |
353 | to cpan\-RT. |
354 | .SH "AUTHOR" |
355 | .IX Header "AUTHOR" |
356 | Stevan Little <stevan@iinteractive.com> |
357 | .SH "COPYRIGHT AND LICENSE" |
358 | .IX Header "COPYRIGHT AND LICENSE" |
359 | Copyright 2007\-2009 by Infinity Interactive, Inc. |
360 | .PP |
361 | <http://www.iinteractive.com> |
362 | .PP |
363 | This library is free software; you can redistribute it and/or modify |
364 | it under the same terms as Perl itself. |