1Object::Tiny(3)       User Contributed Perl Documentation      Object::Tiny(3)
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NAME

6       Object::Tiny - Class building as simple as it gets
7

SYNOPSIS

9         # Define a class
10         package Foo;
11
12         use Object::Tiny qw{ bar baz };
13
14         1;
15
16
17         # Use the class
18         my $object = Foo->new( bar => 1 );
19
20         print "bar is " . $object->bar . "\n";
21

DESCRIPTION

23       There's a whole bunch of class builders out there. In fact, creating a
24       class builder seems to be something of a rite of passage (this is my
25       fifth, at least).
26
27       Unfortunately, most of the time I want a class builder I'm in a hurry
28       and sketching out lots of fairly simple data classes with fairly simple
29       structure, mostly just read-only accessors, and that's about it.
30
31       Often this is for code that won't end up on CPAN, so adding a small
32       dependency doesn't matter much. I just want to be able to define these
33       classes FAST.
34
35       By which I mean LESS typing than writing them by hand, not more. And I
36       don't need all those weird complex features that bloat out the code and
37       take over the whole way I build modules.
38
39       And so, I present yet another member of the Tiny family of modules,
40       Object::Tiny.
41
42       The goal here is really just to save me some typing. There's others
43       that could do the job just fine, but I want something that does as
44       little as possible and creates code the same way I'd have written it by
45       hand anyway.
46
47       To use Object::Tiny, just call it with a list of accessors to be
48       created.
49
50         use Object::Tiny 'foo', 'bar';
51
52       For a large list, I lay it out like this...
53
54         use Object::Tiny qw{
55             item_font_face
56             item_font_color
57             item_font_size
58             item_text_content
59             item_display_time
60             seperator_font_face
61             seperator_font_color
62             seperator_font_size
63             seperator_text_content
64         };
65
66       This will create a bunch of simple accessors, and set the inheritance
67       to be the child of Object::Tiny.
68
69       Object::Tiny is empty other than a basic "new" constructor which does
70       the following
71
72         sub new {
73             my $class = shift;
74             return bless { @_ }, $class;
75         }
76
77       In fact, if doing the following in your class gets annoying...
78
79         sub new {
80             my $class = shift;
81             my $self  = $class->SUPER::new( @_ );
82
83             # Extra checking and such
84             ...
85
86             return $self;
87         }
88
89       ... then feel free to ditch the SUPER call and just create the hash
90       yourself! It's not going to make a lick of different and there's
91       nothing magic going on under the covers you might break.
92
93       And that's really all there is to it. Let a million simple data classes
94       bloom. Features? We don't need no stinking features.
95
96   Handling Subclasses
97       If the class you are using Object::Tiny for is already a subclass of
98       another Object::Tiny class (or a subclass of anything else) it doesn't
99       really work to make the class use multiple inheritance.
100
101       So in this case, Object::Tiny will create the accessors you specify,
102       but WON'T make it a subclass of Object::Tiny.
103
104   Why bother when Class::Accessor::* already does the same thing?
105       As a class builder, Object::Tiny inevitably is compared to
106       Class::Accessor and related modules. They seem so similar, so why would
107       I reimplement it?
108
109       The answer is that for experienced developers that don't need or want
110       hand-holding, Object::Tiny is just outright better, faster or cheaper
111       on every single metric than Class::Accessor::Fast, which is the most
112       comparable member of the Class::Accessor::* family.
113
114       Object::Tiny is 93% smaller than Class::Accessor::Fast
115
116       Class::Accessor::Fast requires about 125k of memory to load.
117
118       Object::Tiny requires about 8k of memory to load.
119
120       Object::Tiny is 75% more terse to use than Class::Accessor::Fast
121
122       Object::Tiny is used with the least possible number of keystrokes
123       (short of making the actual name Object::Tiny smaller).
124
125       And it requires no ugly constructor methods.
126
127       I mean really, what sort of a method name is 'mk_ro_accessors'. That
128       sort of thing went out of style in the early nineties.
129
130       Using Class::Accessor::Fast...
131
132         package Foo::Bar;
133         use base 'Class::Accessor::Fast';
134         Foo::Bar->mk_ro_accessors(qw{ foo bar baz });
135
136       Using Object::Tiny...
137
138         package Foo::Bar;
139         use Object::Tiny qw{ foo bar baz };
140
141       Further, Object::Tiny lets you pass your params in directly, without
142       having to wrap them in an additional HASH reference that will just be
143       copied ANYWAY inside the constructor.
144
145       Using Class::Accessor::Fast...
146
147         my $object = Foo::Bar->new( {
148             foo => 1,
149             bar => 2,
150             baz => 3,
151         } );
152
153       Using Object::Tiny...
154
155         my $object = Foo::Bar->new(
156             foo => 1,
157             bar => 2,
158             baz => 3,
159         );
160
161       Object::Tiny constructors are 110% faster than Class::Accessor::Fast
162
163       Object::Tiny accessors are identical in speed to Class::Accessor::Fast
164       accessors, but Object::Tiny constructors are TWICE as fast as
165       Class::Accessor::Fast constructors, DESPITE C:A:Fast forcing you to
166       pass by reference (which is typically done for speed reasons).
167
168         Benchmarking constructor plus accessors...
169                      Rate accessor     tiny
170         accessor 100949/s       --     -45%
171         tiny     182382/s      81%       --
172
173         Benchmarking constructor alone...
174                      Rate accessor     tiny
175         accessor 156470/s       --     -54%
176         tiny     342231/s     119%       --
177
178         Benchmarking accessors alone...
179                    Rate     tiny accessor
180         tiny     81.0/s       --      -0%
181         accessor 81.0/s       0%       --
182
183       Object::Tiny pollutes your API 95% less than Class::Accessor::Fast
184
185       Object::Tiny adds two methods to your class, "new" and "import". The
186       "new" constructor is so trivial you can just ignore it and use your own
187       if you wish, and the "import" will shortcut and do nothing (it is used
188       to implement the "use Object::Tiny qw{ foo bar baz };" syntax itself).
189
190       So if you make your own import, you can ignore the Object::Tiny one.
191
192       Class::Accessor::Fast isn't quite as light, adding all sorts of useless
193       extra public methods (why on earth would you want to add method
194       accessors at run-time?).
195
196       Here's what the classes used in the benchmark end up like.
197
198           DB<1> use Class::Inspector
199
200           DB<2> x Class::Inspector->methods('Foo_Bar_Tiny');
201         0  ARRAY(0xfda780)
202            0  'bar'
203            1  'baz'
204            2  'foo'
205            3  'import'
206            4  'new'
207
208           DB<3> x Class::Inspector->methods('Foo_Bar_Accessor');
209         0  ARRAY(0xfdb3c8)
210            0  '_bar_accessor'
211            1  '_baz_accessor'
212            2  '_carp'
213            3  '_croak'
214            4  '_foo_accessor'
215            5  '_mk_accessors'
216            6  'accessor_name_for'
217            7  'bar'
218            8  'baz'
219            9  'best_practice_accessor_name_for'
220            10  'best_practice_mutator_name_for'
221            11  'follow_best_practice'
222            12  'foo'
223            13  'get'
224            14  'make_accessor'
225            15  'make_ro_accessor'
226            16  'make_wo_accessor'
227            17  'mk_accessors'
228            18  'mk_ro_accessors'
229            19  'mk_wo_accessors'
230            20  'mutator_name_for'
231            21  'new'
232            22  'set'
233
234       As you can see, Object::Tiny adds 2 methods to your class,
235       Class::Accessor adds 16 methods, plus one extra one for every accessor.
236
237       Object::Tiny doesn't have any of the caveats of Class::Accessor::Fast
238
239       When you call use Object::Tiny qw{ foo bar baz } it isn't treated as
240       some sort of specification for the class, it's just a list of accessors
241       you want made for you.
242
243       So if you want to customize "foo" you don't need to get into
244       contortions with "pure" base classes or calling alternate internal
245       methods. Just make your own "foo" method and remove "foo" from the list
246       passed to the "use" call.
247
248       Object::Tiny is more back-compatible than Class::Accessor::Fast
249
250       Class::Accessor::Fast has a minimum Perl dependency of 5.005002.
251
252       Object::Tiny has a minimum Perl dependency of 5.004.
253
254       Object::Tiny has no module dependencies whatsoever
255
256       Object::Tiny does not load ANYTHING at all outside of its own single
257       .pm file.
258
259       So Object::Tiny will never get confused in odd situations due to old or
260       weird versions of other modules (Class::Accessor::Fast has a dependency
261       on base.pm, which has some caveats of its own).
262

SUPPORT

264       Bugs should be reported via the CPAN bug tracker at
265
266       <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Object-Tiny>
267
268       For other issues, contact the author.
269

AUTHOR

271       Adam Kennedy <adamk@cpan.org>
272

SEE ALSO

274       Config::Tiny
275
277       Copyright 2007 - 2011 Adam Kennedy.
278
279       This program is free software; you can redistribute it and/or modify it
280       under the same terms as Perl itself.
281
282       The full text of the license can be found in the LICENSE file included
283       with this module.
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285
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287perl v5.32.1                      2021-01-27                   Object::Tiny(3)
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