/
impl-serialize.html
881 lines (429 loc) · 30.9 KB
/
impl-serialize.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
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
<!DOCTYPE HTML>
<html lang="en" >
<head>
<meta charset="UTF-8">
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<title>Implementing Serialize · Serde</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="description" content="">
<meta name="generator" content="GitBook 3.2.3">
<link rel="stylesheet" href="gitbook/style.css">
<link rel="stylesheet" href="gitbook/gitbook-plugin-codeblock-rust/block.css">
<link rel="stylesheet" href="gitbook/gitbook-plugin-checklist/checklist.css">
<link rel="stylesheet" href="gitbook/gitbook-plugin-anchors/plugin.css">
<link rel="stylesheet" href="gitbook/gitbook-plugin-highlight/website.css">
<link rel="stylesheet" href="gitbook/gitbook-plugin-fontsettings/website.css">
<link rel="stylesheet" href="styles/website.css">
<meta name="HandheldFriendly" content="true"/>
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<link rel="apple-touch-icon-precomposed" sizes="152x152" href="gitbook/images/apple-touch-icon-precomposed-152.png">
<link rel="shortcut icon" href="gitbook/images/favicon.ico" type="image/x-icon">
<link rel="next" href="impl-deserialize.html" />
<link rel="prev" href="custom-serialization.html" />
</head>
<body>
<div class="book with-summary font-size-2">
<div class="book-summary">
<nav role="navigation">
<ul class="summary">
<li class="chapter " data-level="1.1" data-path="./">
<a href="./">
Overview
</a>
</li>
<li class="chapter " data-level="1.2" data-path="help.html">
<a href="help.html">
Help
</a>
</li>
<li class="chapter " data-level="1.3" data-path="data-model.html">
<a href="data-model.html">
Serde data model
</a>
</li>
<li class="chapter " data-level="1.4" data-path="derive.html">
<a href="derive.html">
Using derive
</a>
</li>
<li class="chapter " data-level="1.5" data-path="attributes.html">
<a href="attributes.html">
Attributes
</a>
<ul class="articles">
<li class="chapter " data-level="1.5.1" data-path="container-attrs.html">
<a href="container-attrs.html">
Container attributes
</a>
</li>
<li class="chapter " data-level="1.5.2" data-path="variant-attrs.html">
<a href="variant-attrs.html">
Variant attributes
</a>
</li>
<li class="chapter " data-level="1.5.3" data-path="field-attrs.html">
<a href="field-attrs.html">
Field attributes
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.6" data-path="custom-serialization.html">
<a href="custom-serialization.html">
Custom serialization
</a>
<ul class="articles">
<li class="chapter active" data-level="1.6.1" data-path="impl-serialize.html">
<a href="impl-serialize.html">
Implementing Serialize
</a>
</li>
<li class="chapter " data-level="1.6.2" data-path="impl-deserialize.html">
<a href="impl-deserialize.html">
Implementing Deserialize
</a>
</li>
<li class="chapter " data-level="1.6.3" data-path="unit-testing.html">
<a href="unit-testing.html">
Unit testing
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.7" data-path="data-format.html">
<a href="data-format.html">
Writing a data format
</a>
<ul class="articles">
<li class="chapter " data-level="1.7.1" data-path="conventions.html">
<a href="conventions.html">
Conventions
</a>
</li>
<li class="chapter " data-level="1.7.2" data-path="error-handling.html">
<a href="error-handling.html">
Error handling
</a>
</li>
<li class="chapter " data-level="1.7.3" data-path="impl-serializer.html">
<a href="impl-serializer.html">
Implementing a Serializer
</a>
</li>
<li class="chapter " data-level="1.7.4" data-path="impl-deserializer.html">
<a href="impl-deserializer.html">
Implementing a Deserializer
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.8" data-path="lifetimes.html">
<a href="lifetimes.html">
Deserializer lifetimes
</a>
</li>
<li class="chapter " data-level="1.9" data-path="examples.html">
<a href="examples.html">
Examples
</a>
<ul class="articles">
<li class="chapter " data-level="1.9.1" data-path="json.html">
<a href="json.html">
Structs and enums in JSON
</a>
</li>
<li class="chapter " data-level="1.9.2" data-path="enum-representations.html">
<a href="enum-representations.html">
Enum representations
</a>
</li>
<li class="chapter " data-level="1.9.3" data-path="attr-default.html">
<a href="attr-default.html">
Default value for a field
</a>
</li>
<li class="chapter " data-level="1.9.4" data-path="attr-flatten.html">
<a href="attr-flatten.html">
Struct flattening
</a>
</li>
<li class="chapter " data-level="1.9.5" data-path="attr-bound.html">
<a href="attr-bound.html">
Handwritten generic type bounds
</a>
</li>
<li class="chapter " data-level="1.9.6" data-path="deserialize-map.html">
<a href="deserialize-map.html">
Deserialize for custom map type
</a>
</li>
<li class="chapter " data-level="1.9.7" data-path="stream-array.html">
<a href="stream-array.html">
Array of values without buffering
</a>
</li>
<li class="chapter " data-level="1.9.8" data-path="enum-number.html">
<a href="enum-number.html">
Serialize enum as number
</a>
</li>
<li class="chapter " data-level="1.9.9" data-path="attr-rename.html">
<a href="attr-rename.html">
Serialize fields as camelCase
</a>
</li>
<li class="chapter " data-level="1.9.10" data-path="attr-skip-serializing.html">
<a href="attr-skip-serializing.html">
Skip serializing field
</a>
</li>
<li class="chapter " data-level="1.9.11" data-path="remote-derive.html">
<a href="remote-derive.html">
Derive for remote crate
</a>
</li>
<li class="chapter " data-level="1.9.12" data-path="deserialize-struct.html">
<a href="deserialize-struct.html">
Manually deserialize struct
</a>
</li>
<li class="chapter " data-level="1.9.13" data-path="ignored-any.html">
<a href="ignored-any.html">
Discarding data
</a>
</li>
<li class="chapter " data-level="1.9.14" data-path="transcode.html">
<a href="transcode.html">
Transcode into another format
</a>
</li>
<li class="chapter " data-level="1.9.15" data-path="string-or-struct.html">
<a href="string-or-struct.html">
Either string or struct
</a>
</li>
<li class="chapter " data-level="1.9.16" data-path="convert-error.html">
<a href="convert-error.html">
Convert error types
</a>
</li>
<li class="chapter " data-level="1.9.17" data-path="custom-date-format.html">
<a href="custom-date-format.html">
Custom date format
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.10" data-path="no-std.html">
<a href="no-std.html">
No-std support
</a>
</li>
<li class="chapter " data-level="1.11" data-path="feature-flags.html">
<a href="feature-flags.html">
Feature flags
</a>
</li>
</ul>
</nav>
</div>
<div class="book-body">
<div class="body-inner">
<div class="book-header" role="navigation">
<!-- Title -->
<h1>
<i class="fa fa-circle-o-notch fa-spin"></i>
<a href="." >Implementing Serialize</a>
</h1>
</div>
<div class="page-wrapper" tabindex="-1" role="main">
<div class="page-inner">
<section class="normal markdown-section">
<h1 id="implementing-serialize"><a name="implementing-serialize" class="plugin-anchor" href="#implementing-serialize"><i class="fa fa-link" aria-hidden="true"></i></a>Implementing Serialize</h1>
<p>The <a href="https://docs.rs/serde/1/serde/ser/trait.Serialize.html" target="_blank"><code>Serialize</code></a> trait looks like this:</p>
<pre><code class="lang-rust"><span class="hljs-keyword">pub</span> <span class="hljs-class"><span class="hljs-keyword">trait</span> <span class="hljs-title">Serialize</span></span> {
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">serialize</span></span><S>(&<span class="hljs-keyword">self</span>, serializer: S) -> <span class="hljs-built_in">Result</span><S::<span class="hljs-literal">Ok</span>, S::Error>
<span class="hljs-keyword">where</span>
S: Serializer;
}
</code></pre>
<p>This method's job is to take your type (<code>&self</code>) and map it into the <a href="data-model.html">Serde data
model</a> by invoking exactly one of the methods on the given <a href="https://docs.rs/serde/1/serde/ser/trait.Serializer.html" target="_blank"><code>Serializer</code></a>.</p>
<p>In most cases Serde's <a href="derive.html">derive</a> is able to generate an appropriate implementation
of <code>Serialize</code> for structs and enums defined in your crate. Should you need to
customize the serialization behavior for a type in a way that derive does not
support, you can implement <code>Serialize</code> yourself.</p>
<h2 id="serializing-a-primitive"><a name="serializing-a-primitive" class="plugin-anchor" href="#serializing-a-primitive"><i class="fa fa-link" aria-hidden="true"></i></a>Serializing a primitive</h2>
<p>As the simplest example, here is the builtin <code>Serialize</code> impl for the primitive
<code>i32</code>.</p>
<pre><code class="lang-rust"><span class="hljs-keyword">impl</span> Serialize <span class="hljs-keyword">for</span> <span class="hljs-keyword">i32</span> {
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">serialize</span></span><S>(&<span class="hljs-keyword">self</span>, serializer: S) -> <span class="hljs-built_in">Result</span><S::<span class="hljs-literal">Ok</span>, S::Error>
<span class="hljs-keyword">where</span>
S: Serializer,
{
serializer.serialize_i32(*<span class="hljs-keyword">self</span>)
}
}
</code></pre>
<p>Serde provides such impls for all of Rust's <a href="https://doc.rust-lang.org/book/primitive-types.html" target="_blank">primitive types</a> so you are not
responsible for implementing them yourself, but <code>serialize_i32</code> and similar
methods may be useful if you have a type that needs to be represented as a
primitive in its serialized form. For example you could <a href="https://serde.rs/enum-number.html" target="_blank">serialize a C-like enum
as a primitive number</a>.</p>
<h2 id="serializing-a-sequence-or-map"><a name="serializing-a-sequence-or-map" class="plugin-anchor" href="#serializing-a-sequence-or-map"><i class="fa fa-link" aria-hidden="true"></i></a>Serializing a sequence or map</h2>
<p>Compound types follow a three-step process of init, elements, end.</p>
<pre><code class="lang-rust"><span class="hljs-keyword">use</span> serde::ser::{Serialize, Serializer, SerializeSeq, SerializeMap};
<span class="hljs-keyword">impl</span><T> Serialize <span class="hljs-keyword">for</span> <span class="hljs-built_in">Vec</span><T>
<span class="hljs-keyword">where</span>
T: Serialize,
{
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">serialize</span></span><S>(&<span class="hljs-keyword">self</span>, serializer: S) -> <span class="hljs-built_in">Result</span><S::<span class="hljs-literal">Ok</span>, S::Error>
<span class="hljs-keyword">where</span>
S: Serializer,
{
<span class="hljs-keyword">let</span> <span class="hljs-keyword">mut</span> seq = serializer.serialize_seq(<span class="hljs-literal">Some</span>(<span class="hljs-keyword">self</span>.len()))?;
<span class="hljs-keyword">for</span> e <span class="hljs-keyword">in</span> <span class="hljs-keyword">self</span> {
seq.serialize_element(e)?;
}
seq.end()
}
}
<span class="hljs-keyword">impl</span><K, V> Serialize <span class="hljs-keyword">for</span> MyMap<K, V>
<span class="hljs-keyword">where</span>
K: Serialize,
V: Serialize,
{
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">serialize</span></span><S>(&<span class="hljs-keyword">self</span>, serializer: S) -> <span class="hljs-built_in">Result</span><S::<span class="hljs-literal">Ok</span>, S::Error>
<span class="hljs-keyword">where</span>
S: Serializer,
{
<span class="hljs-keyword">let</span> <span class="hljs-keyword">mut</span> map = serializer.serialize_map(<span class="hljs-literal">Some</span>(<span class="hljs-keyword">self</span>.len()))?;
<span class="hljs-keyword">for</span> (k, v) <span class="hljs-keyword">in</span> <span class="hljs-keyword">self</span> {
map.serialize_entry(k, v)?;
}
map.end()
}
}
</code></pre>
<h2 id="serializing-a-tuple"><a name="serializing-a-tuple" class="plugin-anchor" href="#serializing-a-tuple"><i class="fa fa-link" aria-hidden="true"></i></a>Serializing a tuple</h2>
<p>The <code>serialize_tuple</code> method is a lot like <code>serialize_seq</code>. The distinction
Serde makes is that <code>serialize_tuple</code> is for sequences where the length does not
need to be serialized because it will be known at deserialization time. The
usual examples are Rust <a href="https://doc.rust-lang.org/std/primitive.tuple.html" target="_blank">tuples</a> and <a href="https://doc.rust-lang.org/std/primitive.array.html" target="_blank">arrays</a>. In non-self-describing formats a
<code>Vec<T></code> needs to be serialized with its length in order to be able to
deserialize a <code>Vec<T></code> back out. But a <code>[T; 16]</code> can be serialized using
<code>serialize_tuple</code> because the length will be known at deserialization time
without looking at the serialized bytes.</p>
<h2 id="serializing-a-struct"><a name="serializing-a-struct" class="plugin-anchor" href="#serializing-a-struct"><i class="fa fa-link" aria-hidden="true"></i></a>Serializing a struct</h2>
<p>Serde distinguishes between four types of structs. <a href="https://doc.rust-lang.org/book/structs.html" target="_blank">Ordinary structs</a> and <a href="https://doc.rust-lang.org/book/structs.html#tuple-structs" target="_blank">tuple
structs</a> follow the three-step process of init, elements, end just like a
sequence or map. <a href="https://doc.rust-lang.org/book/structs.html#tuple-structs" target="_blank">Newtype structs</a> and <a href="https://doc.rust-lang.org/book/structs.html#unit-like-structs" target="_blank">unit structs</a> are more like primitives.</p>
<pre><code class="lang-rust"><span class="hljs-comment">// An ordinary struct. Use three-step process:</span>
<span class="hljs-comment">// 1. serialize_struct</span>
<span class="hljs-comment">// 2. serialize_field</span>
<span class="hljs-comment">// 3. end</span>
<span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">Color</span></span> {
r: <span class="hljs-keyword">u8</span>,
g: <span class="hljs-keyword">u8</span>,
b: <span class="hljs-keyword">u8</span>,
}
<span class="hljs-comment">// A tuple struct. Use three-step process:</span>
<span class="hljs-comment">// 1. serialize_tuple_struct</span>
<span class="hljs-comment">// 2. serialize_field</span>
<span class="hljs-comment">// 3. end</span>
<span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">Point2D</span></span>(<span class="hljs-keyword">f64</span>, <span class="hljs-keyword">f64</span>);
<span class="hljs-comment">// A newtype struct. Use serialize_newtype_struct.</span>
<span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">Inches</span></span>(<span class="hljs-keyword">u64</span>);
<span class="hljs-comment">// A unit struct. Use serialize_unit_struct.</span>
<span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">Instance</span></span>;
</code></pre>
<p>Structs and maps may look similar in some formats, including JSON. The
distinction Serde makes is that structs have keys that are compile-time constant
strings and will be known at deserialization time without looking at the
serialized data. This condition enables some data formats to handle structs much
more efficiently and compactly than maps.</p>
<p>Data formats are encouraged to treat newtype structs as insignificant wrappers
around the inner value, serializing just the inner value. See for example
<a href="json.html">JSON's treatment of newtype structs</a>.</p>
<pre><code class="lang-rust"><span class="hljs-keyword">use</span> serde::ser::{Serialize, Serializer, SerializeStruct};
<span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">Color</span></span> {
r: <span class="hljs-keyword">u8</span>,
g: <span class="hljs-keyword">u8</span>,
b: <span class="hljs-keyword">u8</span>,
}
<span class="hljs-keyword">impl</span> Serialize <span class="hljs-keyword">for</span> Color {
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">serialize</span></span><S>(&<span class="hljs-keyword">self</span>, serializer: S) -> <span class="hljs-built_in">Result</span><S::<span class="hljs-literal">Ok</span>, S::Error>
<span class="hljs-keyword">where</span>
S: Serializer,
{
<span class="hljs-comment">// 3 is the number of fields in the struct.</span>
<span class="hljs-keyword">let</span> <span class="hljs-keyword">mut</span> state = serializer.serialize_struct(<span class="hljs-string">"Color"</span>, <span class="hljs-number">3</span>)?;
state.serialize_field(<span class="hljs-string">"r"</span>, &<span class="hljs-keyword">self</span>.r)?;
state.serialize_field(<span class="hljs-string">"g"</span>, &<span class="hljs-keyword">self</span>.g)?;
state.serialize_field(<span class="hljs-string">"b"</span>, &<span class="hljs-keyword">self</span>.b)?;
state.end()
}
}
</code></pre>
<h2 id="serializing-an-enum"><a name="serializing-an-enum" class="plugin-anchor" href="#serializing-an-enum"><i class="fa fa-link" aria-hidden="true"></i></a>Serializing an enum</h2>
<p>Serializing enum variants is very similar to serializing structs.</p>
<pre><code class="lang-rust"><span class="hljs-class"><span class="hljs-keyword">enum</span> <span class="hljs-title">E</span></span> {
<span class="hljs-comment">// Use three-step process:</span>
<span class="hljs-comment">// 1. serialize_struct_variant</span>
<span class="hljs-comment">// 2. serialize_field</span>
<span class="hljs-comment">// 3. end</span>
Color { r: <span class="hljs-keyword">u8</span>, g: <span class="hljs-keyword">u8</span>, b: <span class="hljs-keyword">u8</span> },
<span class="hljs-comment">// Use three-step process:</span>
<span class="hljs-comment">// 1. serialize_tuple_variant</span>
<span class="hljs-comment">// 2. serialize_field</span>
<span class="hljs-comment">// 3. end</span>
Point2D(<span class="hljs-keyword">f64</span>, <span class="hljs-keyword">f64</span>),
<span class="hljs-comment">// Use serialize_newtype_variant.</span>
Inches(<span class="hljs-keyword">u64</span>),
<span class="hljs-comment">// Use serialize_unit_variant.</span>
Instance,
}
</code></pre>
<h2 id="other-special-cases"><a name="other-special-cases" class="plugin-anchor" href="#other-special-cases"><i class="fa fa-link" aria-hidden="true"></i></a>Other special cases</h2>
<p>There are two more special cases that are part of the Serializer trait.</p>
<p>There is a method <code>serialize_bytes</code> which serializes a <code>&[u8]</code>. Some formats
treat bytes like any other seq, but some formats are able to serialize bytes
more compactly. Currently Serde does not use <code>serialize_bytes</code> in the
<code>Serialize</code> impl for <code>&[u8]</code> or <code>Vec<u8></code> but once <a href="https://github.com/rust-lang/rust/issues/31844" target="_blank">specialization</a> lands in
stable Rust we will begin using it. For now the <a href="https://docs.rs/serde_bytes" target="_blank"><code>serde_bytes</code></a> crate can be
used to enable efficient handling of <code>&[u8]</code> and <code>Vec<u8></code> through
<code>serialize_bytes</code>.</p>
<p>Finally, <code>serialize_some</code> and <code>serialize_none</code> correspond to <code>Option::Some</code> and
<code>Option::None</code>. Users tend to have different expectations around the <code>Option</code>
enum compared to other enums. Serde JSON will serialize <code>Option::None</code> as <code>null</code>
and <code>Option::Some</code> as just the contained value.</p>
</section>
</div>
</div>
</div>
<a href="custom-serialization.html" class="navigation navigation-prev " aria-label="Previous page: Custom serialization">
<i class="fa fa-angle-left"></i>
</a>
<a href="impl-deserialize.html" class="navigation navigation-next " aria-label="Next page: Implementing Deserialize">
<i class="fa fa-angle-right"></i>
</a>
</div>
<script>
var gitbook = gitbook || [];
gitbook.push(function() {
gitbook.page.hasChanged({"page":{"title":"Implementing Serialize","level":"1.6.1","depth":2,"next":{"title":"Implementing Deserialize","level":"1.6.2","depth":2,"path":"impl-deserialize.md","ref":"impl-deserialize.md","articles":[]},"previous":{"title":"Custom serialization","level":"1.6","depth":1,"path":"custom-serialization.md","ref":"custom-serialization.md","articles":[{"title":"Implementing Serialize","level":"1.6.1","depth":2,"path":"impl-serialize.md","ref":"impl-serialize.md","articles":[]},{"title":"Implementing Deserialize","level":"1.6.2","depth":2,"path":"impl-deserialize.md","ref":"impl-deserialize.md","articles":[]},{"title":"Unit testing","level":"1.6.3","depth":2,"path":"unit-testing.md","ref":"unit-testing.md","articles":[]}]},"dir":"ltr"},"config":{"plugins":["-search","-sharing","sane-sidebar","codeblock-omit","codeblock-rust","edit-link","ga4","bulk-redirect","checklist","anchors"],"root":"_src","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"checklist":{},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"codeblock-rust":{},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sane-sidebar":{},"codeblock-omit":{},"bulk-redirect":{"redirectsFile":"redirects.json"},"ga4":{"anonymize_ip":true,"cookie_domain":"serde.rs","tag":"G-T5QD1R7FZW"},"edit-link":{"label":"Edit","base":"https://github.com/serde-rs/serde-rs.github.io/edit/master/_src"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false},"anchors":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Serde","language":"en","gitbook":"*"},"file":{"path":"impl-serialize.md","mtime":"2022-12-18T19:59:50.123Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2024-03-17T00:07:22.816Z"},"basePath":".","book":{"language":""}});
});
</script>
</div>
<script src="gitbook/gitbook.js"></script>
<script src="gitbook/theme.js"></script>
<script src="gitbook/gitbook-plugin-sane-sidebar/plugin.js"></script>
<script src="gitbook/gitbook-plugin-edit-link/plugin.js"></script>
<script src="gitbook/gitbook-plugin-ga4/plugin.js"></script>
<script src="gitbook/gitbook-plugin-lunr/lunr.min.js"></script>
<script src="gitbook/gitbook-plugin-lunr/search-lunr.js"></script>
<script src="gitbook/gitbook-plugin-fontsettings/fontsettings.js"></script>
</body>
</html>