This repository has been archived by the owner on Jan 27, 2025. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathlifecycle.html
519 lines (403 loc) · 28 KB
/
lifecycle.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
<!doctype html>
<html class="no-js" lang="en">
<head>
<meta charset="utf-8">
<!-- seems to be needed -->
<meta http-equiv="Content-Security-Policy" content="default-src *; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline' 'unsafe-eval'">
<title>Object Lifecycle – De Re NSObject</title>
<meta name="description" content="In the realm of Objective-C, and particularly within the mulle-objc framework,
objects undergo a fascinating journey through various lifecycle phases. Each
phase carries its own set of implications for memory management and thread
safety. Let’s dive deeper into this technical landscape and explore some of
the implications.
">
<meta name="keywords" content="">
<!-- Twitter Cards -->
<meta name="twitter:title" content="Object Lifecycle">
<meta name="twitter:description" content="In the realm of Objective-C, and particularly within the mulle-objc framework, objects undergo a fascinating journey through various lifecycle phases. Each phase carries its own set of implications for memory management and thread safety. Let’s dive deeper into this technical landscape and explore some of the implications. Initial Creation: The...">
<meta name="twitter:site" content="@mulle_nat">
<meta name="twitter:creator" content="@mulle_nat">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:image" content="https://www.mulle-kybernetik.com/de-re-nsobject/images/features/lifecycle.png">
<!-- Open Graph -->
<meta property="og:locale" content="en_US">
<meta property="og:type" content="article">
<meta property="og:title" content="Object Lifecycle">
<meta property="og:description" content="In the realm of Objective-C, and particularly within the mulle-objc framework, objects undergo a fascinating journey through various lifecycle phases. Each phase carries its own set of implications for memory management and thread safety. Let’s dive deeper into this technical landscape and explore some of the implications. Initial Creation: The...">
<meta property="og:url" content="https://www.mulle-kybernetik.com/lifecycle.html">
<meta property="og:site_name" content="De Re NSObject">
<meta property="og:image" content="https://www.mulle-kybernetik.com/de-re-nsobject/images/features/lifecycle.png">
<meta property="og:logo" content="https://www.mulle-kybernetik.com/de-re-nsobject/images/logo.png">
<link href="/de-re-nsobject/atom.xml" type="application/atom+xml" rel="alternate" title="De Re NSObject Feed">
<link href="/de-re-nsobject/index.rdf" type="application/rss+xml" rel="alternate" title="De Re NSObject Feed">
<link rel="canonical" href="https://www.mulle-kybernetik.com/lifecycle.html">
<!-- Mobile Specific Metas
–––––––––––––––––––––––––––––––––––––––––––––––––– -->
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- CSS
–––––––––––––––––––––––––––––––––––––––––––––––––– -->
<link rel="stylesheet" href="css/normalize.css">
<link rel="stylesheet" href="css/skeleton.css">
<!-- Code Color
–––––––––––––––––––––––––––––––––––––––––––––––––– -->
<link rel="stylesheet" href="css/monokai.css">
<!-- Site custom css -->
<link rel="stylesheet" href="css/custom.css">
<!-- local FONT
–––––––––––––––––––––––––––––––––––––––––––––––––– -->
<link rel="stylesheet" href="css/junction.css">
<link rel="stylesheet" href="css/poppins.css">
<!-- Favicon
–––––––––––––––––––––––––––––––––––––––––––––––––– -->
<link rel="icon" type="image/svg" href="images/favicon.svg">
<!-- This tag allows for activation of ClearType in Mobile IE for smoothing fonts.-->
<meta http-equiv="cleartype" content="on">
<!-- http://t.co/dKP3o1e -->
<meta name="HandheldFriendly" content="True">
<meta name="MobileOptimized" content="320">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- For all browsers -->
</head>
<body class="post">
<div class="container">
<div class="row">
<div id="post-first" class="four columns">
<div class="sideline">
<div class="bio">
<div class="bio-photo-container" style="display: inline-block">
<img src="images/dog-pic.jpg" class="bio-photo" alt="Nat! bio photo">
</div>
<div style="display: inline-block; padding-left: 8px">
<h4>Nat!</h4>
<p>Senior Mull</p>
</div>
<div class="author-social"><a href="//www.mulle-kybernetik.com" target="_blank" class="link"><img class="inline-img" src="images/homepage-svgrepo-com.svg"></a> <a href="//www.mulle-kybernetik.com" target="_blank" class="link">WWW</a></div>
<div class="author-social"><a href="mailto:[email protected]" target="_blank"><img class="inline-img" src="images/email-svgrepo-com.svg"></a> <a href="mailto:[email protected]" target="_blank" class="link">Email</a></div>
<div class="author-social"><a href="//twitter.com/mulle_nat" target="_blank"><img class="inline-img" src="images/twitter-svgrepo-com.svg"></a> <a href="//twitter.com/mulle_nat" target="_blank" class="link">Twitter</a></div>
<div class="author-social"><a href="//github.com/mulle-nat" target="_blank"><img class="inline-img" src="images/github-svgrepo-com.svg"></a> <a href="//github.com/mulle-nat" target="_blank" class="link">Github</a></div>
<div class="author-social"><a href="//twitch.tv/Mulle_kybernetiK_TV" target="_blank"><img class="inline-img" src="images/twitch-svgrepo-com.svg"></a> <a href="//twitch.tv/Mulle_kybernetiK_TV" target="_blank" class="link">Twitch</a></div>
</div> <!-- bio -->
<div class="title">
<div>
<h2>De Re NSObject <div style="font-size:10px; display: inline-block;">0.0.1</div> <a href="feed.xml"><img class="inline-img" src='images/feed-icon-28x28.png'></a></h2>
</div>
<h6>© 2025 by Nat!, Mulle kybernetiK. All rights reserved.</h6>
<p>
</div> <!-- title -->
<div class="contents">
<h4>Contents</h4>
<ul>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-nsobject/intro.html" title="Intro">Intro</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-nsobject/life-and-death.html" title="NSObject: +alloc / -dealloc">NSObject: +alloc / -dealloc</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-nsobject/retaincount.html" title="NSObject: -retain / -release">NSObject: -retain / -release</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-nsobject/autorelease.html" title="NSObject: -autorelease">NSObject: -autorelease</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-nsobject/always-autoreleased.html" title="AAO: Always autoreleased objects">AAO: Always autoreleased objects</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-nsobject/init.html" title="NSObject: -init">NSObject: -init</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-nsobject/factory.html" title="NSObject: +object">NSObject: +object</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-nsobject/finalize.html" title="NSObject: -finalize">NSObject: -finalize</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-nsobject/alloc.html" title="NSObject: +alloc">NSObject: +alloc</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-nsobject/lifecycle.html" title="Object Lifecycle">Object Lifecycle</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-nsobject/dynamic.html" title="MulleDynamicObject">MulleDynamicObject</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-nsobject/mulleobject.html" title="MulleObject">MulleObject</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-nsobject/outro.html" title="Outro">Outro</a>
</article>
</ul>
<h5> Or read it like a <a href="book.html"><b>book</b></a>.</h6>
</div> <!-- contents -->
</div> <!-- sideline -->
</div>
<div id="post-second" class="eight columns">
<div class="title">
<div>
<h2>De Re NSObject <div style="font-size:10px; display: inline-block;">0.0.1</div> <a href="feed.xml"><img class="inline-img" src='images/feed-icon-28x28.png'></a></h2>
</div>
<h6>© 2025 by Nat!, Mulle kybernetiK. All rights reserved.</h6>
<p>
</div> <!-- title -->
<p>
<div id="main" role="main">
<article>
<h1>Object Lifecycle</h1>
<div>
<p>In the realm of Objective-C, and particularly within the <a href="//mulle-objc.github.io">mulle-objc</a> framework,
objects undergo a fascinating journey through various lifecycle phases. Each
phase carries its own set of implications for memory management and thread
safety. Let’s dive deeper into this technical landscape and explore some of
the implications.</p>
<p><img src="images/lifecycle.svg" alt="Lifecycle" /></p>
<h2 id="initial-creation-the-single-threaded-genesis">Initial Creation: The Single-Threaded Genesis</h2>
<p>When you create an object in <a href="//mulle-objc.github.io">mulle-objc</a> you’re still in a phase of
single-threaded bliss. This initial stage is crucial for setup of immutable
objects.</p>
<blockquote>
<p>LAW: Any object passed to another thread must be placed into the
autoreleasepool stack of that thread.</p>
</blockquote>
<p>During this phase, if you need to dispose of the object, you should use
<code class="language-plaintext highlighter-rouge">-release</code> rather than <code class="language-plaintext highlighter-rouge">-autorelease</code>. This direct approach aligns with the
single-threaded nature of the object at this point.</p>
<h2 id="autorelease-phase-stepping-into-the-multi-threaded-arena">Autorelease Phase: Stepping into the Multi-threaded Arena</h2>
<p>The next phase begins when an object is <code class="language-plaintext highlighter-rouge">-autoreleased</code>. This is a critical
juncture in the object’s lifecycle. Once autoreleased, the object is primed for
a potential multi-threaded existence (assuming it supports multi-threading).</p>
<p>Consider this scenario:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">id</span> <span class="n">obj</span><span class="p">;</span>
<span class="n">obj</span> <span class="o">=</span> <span class="p">[</span><span class="n">NSObject</span> <span class="nf">alloc</span><span class="p">];</span>
<span class="n">obj</span> <span class="o">=</span> <span class="p">[</span><span class="n">obj</span> <span class="nf">init</span><span class="p">];</span>
<span class="n">obj</span> <span class="o">=</span> <span class="p">[</span><span class="n">obj</span> <span class="nf">autorelease</span><span class="p">];</span>
</code></pre></div></div>
<p>At this point, you need to be prepared for the possibility that any thread could
call <code class="language-plaintext highlighter-rouge">mullePerformFinalize</code> on the object. This method is designed to “disable”
the object. Let’s illustrate this with an example:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">NSFileHandle</span> <span class="o">*</span><span class="n">h</span><span class="p">;</span>
<span class="n">h</span> <span class="o">=</span> <span class="p">[</span><span class="n">NSFileHandle</span> <span class="nf">fileHandleForWritingAtPath</span><span class="p">:</span><span class="s">@"/tmp/example.txt"</span><span class="p">];</span>
<span class="c1">// At any point after this, mullePerformFinalize could be called,</span>
<span class="c1">// closing the file handle...</span>
<span class="p">[</span><span class="n">h</span> <span class="nf">mullePerformFinalize</span><span class="p">];</span>
</code></pre></div></div>
<p>During this multi-threaded phase, it’s crucial to balance <code class="language-plaintext highlighter-rouge">-retain</code> calls with
<code class="language-plaintext highlighter-rouge">-autorelease</code>. Using <code class="language-plaintext highlighter-rouge">-release</code> directly is considered a mistake in mulle-objc,
unlike in some other Objective-C implementations.</p>
<h3 id="example-1">Example 1</h3>
<p>Consider this code snippet:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">document</span> <span class="o">=</span> <span class="p">[</span><span class="n">Document</span> <span class="nf">object</span><span class="p">];</span>
<span class="k">@autoreleasepool</span>
<span class="p">{</span>
<span class="c1">// #1</span>
<span class="p">[[</span><span class="n">document</span> <span class="nf">retain</span><span class="p">]</span> <span class="nf">autorelease</span><span class="p">];</span>
<span class="c1">// #2</span>
<span class="p">}</span>
<span class="c1">// #3</span>
</code></pre></div></div>
<p>Here is what happens:</p>
<table>
<tbody>
<tr>
<td><img src="images/pool-object-ownership-2.svg" alt="2" width="120" /> <code class="language-plaintext highlighter-rouge">#1</code></td>
<td><img src="images/pool-object-ownership-3a.svg" alt="3" width="120" /> <code class="language-plaintext highlighter-rouge">#2</code></td>
<td><img src="images/pool-object-ownership-1.svg" alt="1" width="120" /> <code class="language-plaintext highlighter-rouge">#3</code></td>
</tr>
<tr>
<td>A document in the root pool of a hierarchy with a fresh inferior pool</td>
<td>The document gets (retained and) autoreleased into the new pool</td>
<td>The new pool disappears again. The document remains in its old pool</td>
</tr>
</tbody>
</table>
<h3 id="example-2">Example 2</h3>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">document</span> <span class="o">=</span> <span class="p">[</span><span class="n">Document</span> <span class="nf">object</span><span class="p">];</span>
<span class="c1">// #1</span>
<span class="k">@autoreleasepool</span>
<span class="p">{</span>
<span class="c1">// #2</span>
<span class="n">person</span> <span class="o">=</span> <span class="p">[</span><span class="n">Person</span> <span class="nf">object</span><span class="p">];</span>
<span class="p">[</span><span class="n">document</span> <span class="nf">setPerson</span><span class="p">:</span><span class="n">person</span><span class="p">];</span>
<span class="c1">// #3</span>
</code></pre></div></div>
<table>
<tbody>
<tr>
<td><img src="images/pool-object-ownership-1.svg" alt="1" width="120" /> <code class="language-plaintext highlighter-rouge">#1</code></td>
<td><img src="images/pool-object-ownership-2.svg" alt="2" width="120" /> <code class="language-plaintext highlighter-rouge">#2</code></td>
<td><img src="images/pool-object-ownership-3.svg" alt="3" width="120" /> <code class="language-plaintext highlighter-rouge">#3</code></td>
</tr>
<tr>
<td>The initial setup with <em>document</em> in its pool</td>
<td>An inferior pool is created</td>
<td><em>person</em> is created in the inferior pool and ownership is given to <em>document</em> via <code class="language-plaintext highlighter-rouge">-setPerson:</code></td>
</tr>
</tbody>
</table>
<p>Continuing on:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">document</span> <span class="o">=</span> <span class="p">[</span><span class="n">Document</span> <span class="nf">object</span><span class="p">];</span>
<span class="c1">// #1</span>
<span class="k">@autoreleasepool</span>
<span class="p">{</span>
<span class="c1">// #2</span>
<span class="n">person</span> <span class="o">=</span> <span class="p">[</span><span class="n">Person</span> <span class="nf">object</span><span class="p">];</span>
<span class="p">[</span><span class="n">document</span> <span class="nf">setPerson</span><span class="p">:</span><span class="n">person</span><span class="p">];</span>
<span class="c1">// #3</span>
<span class="p">}</span>
<span class="c1">// #4</span>
<span class="k">@autoreleasepool</span>
<span class="p">{</span>
<span class="c1">// #5</span>
<span class="p">[</span><span class="n">document</span> <span class="nf">setPerson</span><span class="p">:</span><span class="nb">nil</span><span class="p">];</span>
<span class="p">}</span>
<span class="c1">// #6</span>
</code></pre></div></div>
<table>
<tbody>
<tr>
<td><img src="images/pool-object-ownership-4.svg" alt="4" width="120" /> <code class="language-plaintext highlighter-rouge">#4</code></td>
<td><img src="images/pool-object-ownership-5.svg" alt="5" width="120" /> <code class="language-plaintext highlighter-rouge">#5</code></td>
<td><img src="images/pool-object-ownership-6.svg" alt="6" width="120" /> <code class="language-plaintext highlighter-rouge">#6</code></td>
</tr>
<tr>
<td>The creation pool disappears. <em>person</em> is still alive</td>
<td>A new inferior pool appears</td>
<td>Document relinquishes ownership when receiving <code class="language-plaintext highlighter-rouge">-setPerson:nil</code></td>
</tr>
</tbody>
</table>
<p>In frame #4 <em>person</em> is implicitly in the same pool as <em>document</em>, through the ownership by <em>document</em>. But its not explicitly in the pool. <em>person</em> didn’t “magically” get an <code class="language-plaintext highlighter-rouge">-autorelease</code> from somewhere, when its creation pool went down.</p>
<h3 id="lifting-an-object-to-a-parent-pool">Lifting an object to a parent pool</h3>
<p>Inside a function or method scope you can <code class="language-plaintext highlighter-rouge">-retain</code> and <code class="language-plaintext highlighter-rouge">-release</code> objects,
as long as you keep it balanced.</p>
<p>Though you are advised to never call <code class="language-plaintext highlighter-rouge">-release</code> directly, you may do so, if you
previously called <code class="language-plaintext highlighter-rouge">-retain</code> on the same object. This is a special case, that is
hardly ever useful.</p>
<p>Somewhat more useful is the ability to <code class="language-plaintext highlighter-rouge">-retain</code> and <code class="language-plaintext highlighter-rouge">-autorelease</code> in the same
function or method scope.</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">-</span> <span class="p">(</span><span class="n">Document</span> <span class="o">*</span><span class="p">)</span> <span class="n">document</span>
<span class="p">{</span>
<span class="n">Document</span> <span class="o">*</span><span class="n">document</span><span class="p">;</span>
<span class="k">@autoreleasepool</span>
<span class="p">{</span>
<span class="n">document</span> <span class="o">=</span> <span class="p">[</span><span class="n">Document</span> <span class="nf">object</span><span class="p">];</span>
<span class="p">[</span><span class="n">document</span> <span class="nf">retain</span><span class="p">];</span>
<span class="p">}</span>
<span class="p">[</span><span class="n">document</span> <span class="nf">autorelease</span><span class="p">];</span>
<span class="k">return</span><span class="p">(</span> <span class="n">document</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div></div>
<p>This can be used to lift an object into a parent pool and therefore extend its lifetime:</p>
<table>
<tbody>
<tr>
<td><img src="images/pool-object-ownership-3b.svg" alt="4" width="240" /></td>
</tr>
</tbody>
</table>
<h2 id="the-return-to-single-threaded-life">The Return to Single-threaded Life</h2>
<p>An interesting aspect of mulle-objc’s object lifecycle is the potential return
to single-threaded existence. This occurs when an object’s retain count reaches 1.
On occasion it can be useful to check for this condition in your code:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">if</span><span class="p">(</span> <span class="p">[</span><span class="n">obj</span> <span class="nf">retainCount</span><span class="p">]</span> <span class="o">==</span> <span class="mi">1</span><span class="p">)</span>
<span class="p">{</span>
<span class="c1">// Object is back to single-threaded life</span>
<span class="p">}</span>
</code></pre></div></div>
<h2 id="the-final-act-deallocation">The Final Act: Deallocation</h2>
<p>The deallocation phase always occurs while the object is single-threaded. During
-dealloc we also know that the objects is not in a pool, so objects that are still
retained by the object, must be released now. As they are also not implicitly in
a pool anymore (from the perspective of the instance executing <code class="language-plaintext highlighter-rouge">-dealloc</code>) it would be wrong to call <code class="language-plaintext highlighter-rouge">-autorelease</code> on them.</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">finalize</span>
<span class="p">{</span>
<span class="p">[</span><span class="n">self</span> <span class="nf">cleanup</span><span class="p">];</span> <span class="c1">// Last chance for cleanup</span>
<span class="p">[</span><span class="n">super</span> <span class="nf">finalize</span><span class="p">];</span>
<span class="p">}</span>
<span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">dealloc</span>
<span class="p">{</span>
<span class="p">[</span><span class="n">_data</span> <span class="nf">release</span><span class="p">];</span>
<span class="p">[</span><span class="n">super</span> <span class="nf">dealloc</span><span class="p">];</span>
<span class="p">}</span>
</code></pre></div></div>
<p>The distinction between <code class="language-plaintext highlighter-rouge">finalize</code> and <code class="language-plaintext highlighter-rouge">dealloc</code> is crucial in mulle-objc:</p>
<ul>
<li><code class="language-plaintext highlighter-rouge">finalize</code>: Closes resources and cleans up state. It can run early via
<code class="language-plaintext highlighter-rouge">mullePerformFinalize</code>.</li>
<li><code class="language-plaintext highlighter-rouge">dealloc</code>: Releases retained objects.</li>
</ul>
<p>This two-step cleanup process allows for more flexible and robust resource
management compared to simpler models used in languages like C++.</p>
<p>Understanding this lifecycle is paramount for several reasons:</p>
<ol>
<li>It allows for precise performance optimization.</li>
<li>It provides clear thread-safety guarantees.</li>
<li>It enables efficient resource management.</li>
<li>It helps prevent memory leaks.</li>
<li>It ensures clean object cleanup.</li>
</ol>
<p>As you work with mulle-objc, you’ll find that this sophisticated lifecycle
management system provides powerful tools for creating efficient, thread-safe,
and resource-conscious applications. How will you leverage these capabilities in
your next project?</p>
</div>
</article>
</div>
<p>
<div class="left-right" id="pn-container">
<div class="left-half">
<span class="link">
Back to <a rel="prev" class="internal-link" href="/de-re-nsobject/alloc.html">NSObject: +alloc</a>
</span>
</div>
<div class="right-half">
<span class="link">
Next <a rel="next" class="internal-link" href="/de-re-nsobject/dynamic.html">MulleDynamicObject</a>
</span>
</div>
</div> <!-- left_right -->
</div> <!-- eight columns -->
</div> <!-- row -->
</div> <!-- container -->
<script>
document.querySelectorAll('pre').forEach((block) => {
const button = document.createElement('button');
button.className = 'copy-button';
button.innerHTML = `<svg aria-hidden="true" data-prefix="far" data-icon="copy" class="svg-inline--fa fa-copy fa-fw fa-1x" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 440 500"><path fill="currentColor" d="M384 336H192c-9 0-16-7-16-16V64c0-9 7-16 16-16h140l68 68v204c0 9-7 16-16 16zm-192 48h192c35 0 64-29 64-64V116c0-13-5-25-14-34l-68-68c-9-9-21-14-34-14H192c-35 0-64 29-64 64v256c0 35 29 64 64 64zM64 128c-35 0-64 29-64 64v256c0 35 29 64 64 64h192c35 0 64-29 64-64v-32h-48v32c0 9-7 16-16 16H64c-9 0-16-7-16-16V192c0-9 7-16 16-16h32v-48H64z"/></svg>`;
block.appendChild(button);
button.addEventListener('click', () => {
const code = block.querySelector('code');
navigator.clipboard.writeText(code.textContent).then(() => {
// Change icon to checkmark
const originalHTML = button.innerHTML;
button.innerHTML = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" width="16" height="16"><path fill-rule="evenodd" d="M20 5a1 1 0 0 1 0 1l-9 13a1 1 0 0 1-1 0l-7-6a1 1 0 0 1 1-1l5 6 10-13a1 1 0 0 1 1 0z" clip-rule="evenodd"/></svg>';
// Reset after delay
setTimeout(() => {
// Restore original icon
button.innerHTML = originalHTML;
// fidget this for reasons...
button.style.color = '#6a6a7c';
}, 500);
});
});
});
</script>
<!-- Matomo -->
<script type="text/javascript">
var _paq = window._paq || [];
/* tracker methods like "setCustomDimension" should be called before "trackPageView" */
_paq.push(["setCookieDomain", "*.www.mulle-kybernetik.com"]);
_paq.push(["setDomains", ["*.www.mulle-kybernetik.com"]]);
_paq.push(['trackPageView']);
_paq.push(['enableLinkTracking']);
(function() {
var u="//www.mulle-kybernetik.com/matomo/";
_paq.push(['setTrackerUrl', u+'matomo.php']);
_paq.push(['setSiteId', '1']);
var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s);
})();
</script>
<noscript><p><img src="//www.mulle-kybernetik.com/matomo/matomo.php?idsite=1&rec=1" style="border:0;" alt="" /></p></noscript>
<!-- End Matomo Code -->
</body>
</html>