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class="clean-btn menu__caret"></button></div><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="categoryLink_byQd menu__link menu__link--sublist" tabindex=0 href=/zh-CN/docs/guide/scala/><span title=Scala class=categoryLinkLabel_W154>Scala</span></a><button aria-label="展开侧边栏分类 'Scala'" aria-expanded=false type=button class="clean-btn menu__caret"></button></div><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="categoryLink_byQd menu__link menu__link--sublist" tabindex=0 href=/zh-CN/docs/guide/kotlin/><span title=Kotlin class=categoryLinkLabel_W154>Kotlin</span></a><button aria-label="展开侧边栏分类 'Kotlin'" aria-expanded=false type=button class="clean-btn menu__caret"></button></div><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="categoryLink_byQd menu__link menu__link--sublist" tabindex=0 href=/zh-CN/docs/guide/xlang/><span title=跨语言 class=categoryLinkLabel_W154>跨语言</span></a><button aria-label="展开侧边栏分类 '跨语言'" aria-expanded=false type=button class="clean-btn menu__caret"></button></div></ul></ul></nav></div></div></aside><main class=docMainContainer_TBSr><div class="container padding-top--md padding-bottom--lg"><div class=row><div class="col docItemCol_VOVn"><div class=docItemContainer_Djhp><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label=页面路径><ul class=breadcrumbs><li class=breadcrumbs__item><a aria-label=主页面 class=breadcrumbs__link href=/zh-CN/><svg viewBox="0 0 24 24" class=breadcrumbHomeIcon_YNFT><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill=currentColor /></svg></a><li class=breadcrumbs__item><span class=breadcrumbs__link>用户指南</span><li class=breadcrumbs__item><a class=breadcrumbs__link href=/zh-CN/docs/guide/cpp/><span>C++</span></a><li class="breadcrumbs__item breadcrumbs__item--active"><span class=breadcrumbs__link>Schema 演化</span></ul></nav><span class="theme-doc-version-badge badge badge--secondary">版本：1.3.0</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type=button class="clean-btn tocCollapsibleButton_TO0P">本页总览</button></div><div class="theme-doc-markdown markdown"><header><h1>Schema 演化</h1></header><p>Apache Fory™ 在 <strong>Compatible 模式</strong>下支持 schema 演化，允许序列化和反序列化双方拥有不同的类型定义。</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=compatible-模式>Compatible 模式<a href=#compatible-模式 class=hash-link aria-label="Compatible 模式的直接链接" title="Compatible 模式的直接链接" translate=no></a></h2> |
| <p>使用 <code>compatible(true)</code> 启用 schema 演化：</p> |
| <div class="language-cpp codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-cpp codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token macro property directive-hash" style=color:#36acaa>#</span><span class="token macro property directive keyword" style=color:#00009f>include</span><span class="token macro property" style=color:#36acaa> </span><span class="token macro property string" style=color:#e3116c>"fory/serialization/fory.h"</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>using</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>namespace</span><span class="token plain"> fory</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">serialization</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 版本 1：原始 schema</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token class-name">PersonV1</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string name</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>int32_t</span><span class="token plain"> age</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>FORY_STRUCT</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">PersonV1</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> name</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> age</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 版本 2：添加 email 字段</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token class-name">PersonV2</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string name</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>int32_t</span><span class="token plain"> age</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string email</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 新字段</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>FORY_STRUCT</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">PersonV2</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> name</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> age</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> email</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>int</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>main</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 为每个 schema 版本创建单独的 Fory 实例</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> fory_v1 </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">Fory</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token function" style=color:#d73a49>builder</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>compatible</span><span class="token punctuation" style=color:#393A34>(</span><span class="token boolean" style=color:#36acaa>true</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 启用 schema 演化</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>xlang</span><span class="token punctuation" style=color:#393A34>(</span><span class="token boolean" style=color:#36acaa>true</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>build</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> fory_v2 </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">Fory</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token function" style=color:#d73a49>builder</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>compatible</span><span class="token punctuation" style=color:#393A34>(</span><span class="token boolean" style=color:#36acaa>true</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>xlang</span><span class="token punctuation" style=color:#393A34>(</span><span class="token boolean" style=color:#36acaa>true</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>build</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 使用相同的类型 ID 进行 schema 演化</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>constexpr</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>uint32_t</span><span class="token plain"> PERSON_TYPE_ID </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>100</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> fory_v1</span><span class="token punctuation" style=color:#393A34>.</span><span class="token generic-function function" style=color:#d73a49>register_struct</span><span class="token generic-function generic class-name operator" style=color:#393A34><</span><span class="token generic-function generic class-name">PersonV1</span><span class="token generic-function generic class-name operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">PERSON_TYPE_ID</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> fory_v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token generic-function function" style=color:#d73a49>register_struct</span><span class="token generic-function generic class-name operator" style=color:#393A34><</span><span class="token generic-function generic class-name">PersonV2</span><span class="token generic-function generic class-name operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">PERSON_TYPE_ID</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 使用 V1 序列化</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> PersonV1 v1</span><span class="token punctuation" style=color:#393A34>{</span><span class="token string" style=color:#e3116c>"Alice"</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>30</span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> bytes </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> fory_v1</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>serialize</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">v1</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>value</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 反序列化为 V2 - email 获得默认值（空字符串）</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> v2 </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> fory_v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token generic-function function" style=color:#d73a49>deserialize</span><span class="token generic-function generic class-name operator" style=color:#393A34><</span><span class="token generic-function generic class-name">PersonV2</span><span class="token generic-function generic class-name operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">bytes</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>value</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">name </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"Alice"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">age </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>30</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">email </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>""</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 缺失字段的默认值</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>return</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>0</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=schema-演化特性>Schema 演化特性<a href=#schema-演化特性 class=hash-link aria-label="Schema 演化特性的直接链接" title="Schema 演化特性的直接链接" translate=no></a></h2> |
| <p>Compatible 模式支持以下 schema 变更：</p> |
| <table><thead><tr><th>变更类型<th>支持<th>行为<tbody><tr><td>添加新字段<td>✅<td>缺失字段使用默认值<tr><td>删除字段<td>✅<td>额外字段被跳过<tr><td>重排字段顺序<td>✅<td>按名称匹配字段，而非位置<tr><td>更改可空性<td>✅<td><code>T</code> ↔ <code>std::optional<T></code><tr><td>更改字段类型<td>❌<td>类型必须兼容<tr><td>重命名字段<td>❌<td>字段名必须匹配（区分大小写）</table> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=添加字段向后兼容>添加字段（向后兼容）<a href=#添加字段向后兼容 class=hash-link aria-label=添加字段（向后兼容）的直接链接 title=添加字段（向后兼容）的直接链接 translate=no></a></h2> |
| <p>当使用具有额外字段的新 schema 反序列化旧数据时：</p> |
| <div class="language-cpp codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-cpp codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic>// 旧 schema (V1)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token class-name">ProductV1</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string name</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>double</span><span class="token plain"> price</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>FORY_STRUCT</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">ProductV1</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> name</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> price</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 新 schema (V2) 带有额外字段</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token class-name">ProductV2</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string name</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>double</span><span class="token plain"> price</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">vector</span><span class="token operator" style=color:#393A34><</span><span class="token plain">std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string</span><span class="token operator" style=color:#393A34>></span><span class="token plain"> tags</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 新字段</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">map</span><span class="token operator" style=color:#393A34><</span><span class="token plain">std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string</span><span class="token operator" style=color:#393A34>></span><span class="token plain"> attributes</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 新字段</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>FORY_STRUCT</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">ProductV2</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> name</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> price</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> tags</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> attributes</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 序列化 V1</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">ProductV1 v1</span><span class="token punctuation" style=color:#393A34>{</span><span class="token string" style=color:#e3116c>"Laptop"</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>999.99</span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> bytes </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> fory_v1</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>serialize</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">v1</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>value</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 反序列化为 V2</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> v2 </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> fory_v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token generic-function function" style=color:#d73a49>deserialize</span><span class="token generic-function generic class-name operator" style=color:#393A34><</span><span class="token generic-function generic class-name">ProductV2</span><span class="token generic-function generic class-name operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">bytes</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>value</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">name </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"Laptop"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">price </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>999.99</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">tags</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>empty</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 默认：空 vector</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">attributes</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>empty</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 默认：空 map</span><br/></div></code></pre></div></div> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=删除字段向前兼容>删除字段（向前兼容）<a href=#删除字段向前兼容 class=hash-link aria-label=删除字段（向前兼容）的直接链接 title=删除字段（向前兼容）的直接链接 translate=no></a></h2> |
| <p>当使用具有较少字段的旧 schema 反序列化新数据时：</p> |
| <div class="language-cpp codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-cpp codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic>// 完整 schema</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token class-name">UserFull</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>int64_t</span><span class="token plain"> id</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string username</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string email</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string password_hash</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>int32_t</span><span class="token plain"> login_count</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>FORY_STRUCT</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">UserFull</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> id</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> username</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> email</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> password_hash</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> login_count</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 精简 schema（删除了 3 个字段）</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token class-name">UserMinimal</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>int64_t</span><span class="token plain"> id</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string username</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>FORY_STRUCT</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">UserMinimal</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> id</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> username</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 序列化完整版本</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">UserFull full</span><span class="token punctuation" style=color:#393A34>{</span><span class="token number" style=color:#36acaa>12345</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"johndoe"</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"john@example.com"</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"hash123"</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>42</span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> bytes </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> fory_full</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>serialize</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">full</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>value</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 反序列化为精简版本 - 额外字段被跳过</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> minimal </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> fory_minimal</span><span class="token punctuation" style=color:#393A34>.</span><span class="token generic-function function" style=color:#d73a49>deserialize</span><span class="token generic-function generic class-name operator" style=color:#393A34><</span><span class="token generic-function generic class-name">UserMinimal</span><span class="token generic-function generic class-name operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">bytes</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>value</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">minimal</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">id </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>12345</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">minimal</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">username </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"johndoe"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// email、password_hash、login_count 被跳过</span><br/></div></code></pre></div></div> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=字段重排>字段重排<a href=#字段重排 class=hash-link aria-label=字段重排的直接链接 title=字段重排的直接链接 translate=no></a></h2> |
| <p>在 compatible 模式下，字段按名称匹配，而非位置：</p> |
| <div class="language-cpp codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-cpp codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic>// 原始字段顺序</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token class-name">ConfigOriginal</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string host</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>int32_t</span><span class="token plain"> port</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>bool</span><span class="token plain"> enable_ssl</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string protocol</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>FORY_STRUCT</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">ConfigOriginal</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> host</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> port</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> enable_ssl</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> protocol</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 重排后的字段</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token class-name">ConfigReordered</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>bool</span><span class="token plain"> enable_ssl</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 移到第一位</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string protocol</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 移到第二位</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string host</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 移到第三位</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>int32_t</span><span class="token plain"> port</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 移到最后</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>FORY_STRUCT</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">ConfigReordered</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> enable_ssl</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> protocol</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> host</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> port</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 使用原始顺序序列化</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">ConfigOriginal orig</span><span class="token punctuation" style=color:#393A34>{</span><span class="token string" style=color:#e3116c>"localhost"</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>8080</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token boolean" style=color:#36acaa>true</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"https"</span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> bytes </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> fory_orig</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>serialize</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">orig</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>value</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 使用不同字段顺序反序列化 - 正常工作</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> reordered </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> fory_reord</span><span class="token punctuation" style=color:#393A34>.</span><span class="token generic-function function" style=color:#d73a49>deserialize</span><span class="token generic-function generic class-name operator" style=color:#393A34><</span><span class="token generic-function generic class-name">ConfigReordered</span><span class="token generic-function generic class-name operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">bytes</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>value</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">reordered</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">host </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"localhost"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">reordered</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">port </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>8080</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">reordered</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">enable_ssl </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token boolean" style=color:#36acaa>true</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">reordered</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">protocol </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"https"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=嵌套结构体演化>嵌套结构体演化<a href=#嵌套结构体演化 class=hash-link aria-label=嵌套结构体演化的直接链接 title=嵌套结构体演化的直接链接 translate=no></a></h2> |
| <p>Schema 演化递归支持嵌套结构体：</p> |
| <div class="language-cpp codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-cpp codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic>// V1 Address</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token class-name">AddressV1</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string street</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string city</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>FORY_STRUCT</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">AddressV1</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> street</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> city</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// V2 Address 带有新字段</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token class-name">AddressV2</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string street</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string city</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string country</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 新字段</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string zipcode</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 新字段</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>FORY_STRUCT</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">AddressV2</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> street</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> city</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> country</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> zipcode</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// V1 Employee 使用 V1 Address</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token class-name">EmployeeV1</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string name</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> AddressV1 home_address</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>FORY_STRUCT</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">EmployeeV1</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> name</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> home_address</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// V2 Employee 使用 V2 Address 和新字段</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token class-name">EmployeeV2</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string name</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> AddressV2 home_address</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 嵌套结构体已演化</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string employee_id</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 新字段</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>FORY_STRUCT</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">EmployeeV2</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> name</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> home_address</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> employee_id</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 使用相同 ID 注册类型</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>constexpr</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>uint32_t</span><span class="token plain"> ADDRESS_TYPE_ID </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>100</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>constexpr</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>uint32_t</span><span class="token plain"> EMPLOYEE_TYPE_ID </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>101</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">fory_v1</span><span class="token punctuation" style=color:#393A34>.</span><span class="token generic-function function" style=color:#d73a49>register_struct</span><span class="token generic-function generic class-name operator" style=color:#393A34><</span><span class="token generic-function generic class-name">AddressV1</span><span class="token generic-function generic class-name operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">ADDRESS_TYPE_ID</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">fory_v1</span><span class="token punctuation" style=color:#393A34>.</span><span class="token generic-function function" style=color:#d73a49>register_struct</span><span class="token generic-function generic class-name operator" style=color:#393A34><</span><span class="token generic-function generic class-name">EmployeeV1</span><span class="token generic-function generic class-name operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">EMPLOYEE_TYPE_ID</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">fory_v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token generic-function function" style=color:#d73a49>register_struct</span><span class="token generic-function generic class-name operator" style=color:#393A34><</span><span class="token generic-function generic class-name">AddressV2</span><span class="token generic-function generic class-name operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">ADDRESS_TYPE_ID</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">fory_v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token generic-function function" style=color:#d73a49>register_struct</span><span class="token generic-function generic class-name operator" style=color:#393A34><</span><span class="token generic-function generic class-name">EmployeeV2</span><span class="token generic-function generic class-name operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">EMPLOYEE_TYPE_ID</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 序列化 V1</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">EmployeeV1 emp_v1</span><span class="token punctuation" style=color:#393A34>{</span><span class="token string" style=color:#e3116c>"Jane Doe"</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token string" style=color:#e3116c>"123 Main St"</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"NYC"</span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> bytes </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> fory_v1</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>serialize</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">emp_v1</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>value</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 反序列化为 V2</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> emp_v2 </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> fory_v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token generic-function function" style=color:#d73a49>deserialize</span><span class="token generic-function generic class-name operator" style=color:#393A34><</span><span class="token generic-function generic class-name">EmployeeV2</span><span class="token generic-function generic class-name operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">bytes</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>value</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">emp_v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">name </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"Jane Doe"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">emp_v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">home_address</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">street </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"123 Main St"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">emp_v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">home_address</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">city </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"NYC"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">emp_v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">home_address</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">country </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>""</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 默认值</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">emp_v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">home_address</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">zipcode </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>""</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 默认值</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">emp_v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">employee_id </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>""</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 默认值</span><br/></div></code></pre></div></div> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=双向演化>双向演化<a href=#双向演化 class=hash-link aria-label=双向演化的直接链接 title=双向演化的直接链接 translate=no></a></h2> |
| <p>Schema 演化双向工作：</p> |
| <div class="language-cpp codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-cpp codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic>// V2 -> V1（降级）</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">PersonV2 v2</span><span class="token punctuation" style=color:#393A34>{</span><span class="token string" style=color:#e3116c>"Charlie"</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>35</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"charlie@example.com"</span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> bytes </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> fory_v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>serialize</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">v2</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>value</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> v1 </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> fory_v1</span><span class="token punctuation" style=color:#393A34>.</span><span class="token generic-function function" style=color:#d73a49>deserialize</span><span class="token generic-function generic class-name operator" style=color:#393A34><</span><span class="token generic-function generic class-name">PersonV1</span><span class="token generic-function generic class-name operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">bytes</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>value</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">v1</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">name </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>"Charlie"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>assert</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">v1</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">age </span><span class="token operator" style=color:#393A34>==</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>35</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// email 字段在反序列化时被丢弃</span><br/></div></code></pre></div></div> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=默认值>默认值<a href=#默认值 class=hash-link aria-label=默认值的直接链接 title=默认值的直接链接 translate=no></a></h2> |
| <p>当字段缺失时，使用 C++ 默认初始化：</p> |
| <table><thead><tr><th>类型<th>默认值<tbody><tr><td><code>int8_t</code>、<code>int16_t</code>...<td><code>0</code><tr><td><code>float</code>、<code>double</code><td><code>0.0</code><tr><td><code>bool</code><td><code>false</code><tr><td><code>std::string</code><td><code>""</code><tr><td><code>std::vector<T></code><td>空 vector<tr><td><code>std::map<K,V></code><td>空 map<tr><td><code>std::set<T></code><td>空 set<tr><td><code>std::optional<T></code><td><code>std::nullopt</code><tr><td>结构体类型<td>默认构造</table> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=schemaconsistent-模式默认>SchemaConsistent 模式（默认）<a href=#schemaconsistent-模式默认 class=hash-link aria-label="SchemaConsistent 模式（默认）的直接链接" title="SchemaConsistent 模式（默认）的直接链接" translate=no></a></h2> |
| <p>不使用 compatible 模式时，schema 必须完全匹配：</p> |
| <div class="language-cpp codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-cpp codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic>// 严格模式（默认）</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> fory </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">Fory</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token function" style=color:#d73a49>builder</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>compatible</span><span class="token punctuation" style=color:#393A34>(</span><span class="token boolean" style=color:#36acaa>false</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 默认：schema 必须匹配</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>xlang</span><span class="token punctuation" style=color:#393A34>(</span><span class="token boolean" style=color:#36acaa>true</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>build</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 序列化/反序列化要求相同的 schema</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// Schema 不匹配可能导致错误或未定义行为</span><br/></div></code></pre></div></div> |
| <p><strong>何时使用 SchemaConsistent 模式：</strong></p> |
| <ul> |
| <li class="">Schema 保证匹配（相同的二进制版本）</li> |
| <li class="">需要最高性能（更少的元数据开销）</li> |
| <li class="">您同时控制序列化和反序列化</li> |
| </ul> |
| <p><strong>何时使用 Compatible 模式：</strong></p> |
| <ul> |
| <li class="">Schema 可能独立演化</li> |
| <li class="">需要跨版本兼容性</li> |
| <li class="">不同服务可能有不同的 schema 版本</li> |
| </ul> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=类型-id-要求>类型 ID 要求<a href=#类型-id-要求 class=hash-link aria-label="类型 ID 要求的直接链接" title="类型 ID 要求的直接链接" translate=no></a></h2> |
| <p>要使 schema 演化正常工作：</p> |
| <ol> |
| <li class=""><strong>相同类型 ID</strong>：同一结构体的不同版本必须使用相同的类型 ID</li> |
| <li class=""><strong>一致的 ID</strong>：类型 ID 必须在所有 Fory 实例中保持一致</li> |
| <li class=""><strong>注册所有版本</strong>：每个 Fory 实例注册自己的结构体版本</li> |
| </ol> |
| <div class="language-cpp codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-cpp codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>constexpr</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>uint32_t</span><span class="token plain"> PERSON_TYPE_ID </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>100</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 实例 1 使用 PersonV1</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">fory_v1</span><span class="token punctuation" style=color:#393A34>.</span><span class="token generic-function function" style=color:#d73a49>register_struct</span><span class="token generic-function generic class-name operator" style=color:#393A34><</span><span class="token generic-function generic class-name">PersonV1</span><span class="token generic-function generic class-name operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">PERSON_TYPE_ID</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 实例 2 使用 PersonV2</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">fory_v2</span><span class="token punctuation" style=color:#393A34>.</span><span class="token generic-function function" style=color:#d73a49>register_struct</span><span class="token generic-function generic class-name operator" style=color:#393A34><</span><span class="token generic-function generic class-name">PersonV2</span><span class="token generic-function generic class-name operator" style=color:#393A34>></span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">PERSON_TYPE_ID</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 相同的类型 ID 启用 schema 演化</span><br/></div></code></pre></div></div> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=最佳实践>最佳实践<a href=#最佳实践 class=hash-link aria-label=最佳实践的直接链接 title=最佳实践的直接链接 translate=no></a></h2> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=1-为演化做规划>1. 为演化做规划<a href=#1-为演化做规划 class=hash-link aria-label="1. 为演化做规划的直接链接" title="1. 为演化做规划的直接链接" translate=no></a></h3> |
| <p>设计 schema 时考虑未来的变更：</p> |
| <div class="language-cpp codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-cpp codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic>// 好的做法：对可能删除的字段使用 optional</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token class-name">Config</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string host</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>int32_t</span><span class="token plain"> port</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">optional</span><span class="token operator" style=color:#393A34><</span><span class="token plain">std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string</span><span class="token operator" style=color:#393A34>></span><span class="token plain"> deprecated_field</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 以后可以删除</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=2-使用有意义的默认值>2. 使用有意义的默认值<a href=#2-使用有意义的默认值 class=hash-link aria-label="2. 使用有意义的默认值的直接链接" title="2. 使用有意义的默认值的直接链接" translate=no></a></h3> |
| <p>考虑新字段使用什么默认值才有意义：</p> |
| <div class="language-cpp codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-cpp codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>struct</span><span class="token plain"> </span><span class="token class-name">Settings</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>int32_t</span><span class="token plain"> timeout_ms</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 默认：0（可能需要一个合理的默认值）</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>bool</span><span class="token plain"> enabled</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 默认：false</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> std</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token plain">string mode</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"> </span><span class="token comment" style=color:#999988;font-style:italic>// 默认：""（可能需要 "default"）</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=3-记录-schema-版本>3. 记录 Schema 版本<a href=#3-记录-schema-版本 class=hash-link aria-label="3. 记录 Schema 版本的直接链接" title="3. 记录 Schema 版本的直接链接" translate=no></a></h3> |
| <p>跟踪 schema 变更以便调试：</p> |
| <div class="language-cpp codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-cpp codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic>// V1：初始 schema（2024-01-01）</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// V2：添加 email 字段（2024-02-01）</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// V3：添加 phone、address 字段（2024-03-01）</span><br/></div></code></pre></div></div> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=4-测试演化路径>4. 测试演化路径<a href=#4-测试演化路径 class=hash-link aria-label="4. 测试演化路径的直接链接" title="4. 测试演化路径的直接链接" translate=no></a></h3> |
| <p>测试升级和降级场景：</p> |
| <div class="language-cpp codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-cpp codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic>// 测试 V1 -> V2</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 测试 V2 -> V1</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 测试 V1 -> V3</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token comment" style=color:#999988;font-style:italic>// 测试 V3 -> V1</span><br/></div></code></pre></div></div> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=跨语言-schema-演化>跨语言 Schema 演化<a href=#跨语言-schema-演化 class=hash-link aria-label="跨语言 Schema 演化的直接链接" title="跨语言 Schema 演化的直接链接" translate=no></a></h2> |
| <p>使用 xlang 模式时，schema 演化跨语言工作：</p> |
| <div class="language-cpp codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-cpp codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic>// 使用 compatible 模式的 C++</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>auto</span><span class="token plain"> fory </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">Fory</span><span class="token double-colon punctuation" style=color:#393A34>::</span><span class="token function" style=color:#d73a49>builder</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>compatible</span><span class="token punctuation" style=color:#393A34>(</span><span class="token boolean" style=color:#36acaa>true</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>xlang</span><span class="token punctuation" style=color:#393A34>(</span><span class="token boolean" style=color:#36acaa>true</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>build</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div> |
| <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-java codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token comment" style=color:#999988;font-style:italic>// 使用 compatible 模式的 Java</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token class-name">Fory</span><span class="token plain"> fory </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token class-name">Fory</span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>builder</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>withCompatibleMode</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">CompatibleMode</span><span class="token punctuation" style=color:#393A34>.</span><span class="token constant" style=color:#36acaa>COMPATIBLE</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>withLanguage</span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">Language</span><span class="token punctuation" style=color:#393A34>.</span><span class="token constant" style=color:#36acaa>XLANG</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token function" style=color:#d73a49>build</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><br/></div></code></pre></div></div> |
| <p>即使 schema 版本不同，两个实例也可以交换数据。</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=相关主题>相关主题<a href=#相关主题 class=hash-link aria-label=相关主题的直接链接 title=相关主题的直接链接 translate=no></a></h2> |
| <ul> |
| <li class=""><a class="" href=/zh-CN/docs/guide/cpp/configuration>配置</a> - 启用 compatible 模式</li> |
| <li class=""><a class="" href=/zh-CN/docs/guide/cpp/type_registration>类型注册</a> - 类型 ID 管理</li> |
| <li class=""><a class="" href=/zh-CN/docs/guide/cpp/xlang_serialization>跨语言</a> - 跨语言注意事项</li> |
| </ul></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col noPrint_WFHX"><a href=https://github.com/apache/fory-site/tree/main/i18n/zh-CN/docusaurus-plugin-content-docs/version-1.3.0/guide/cpp/schema-evolution.md target=_blank rel="noopener noreferrer" class=theme-edit-this-page><svg fill=currentColor height=20 width=20 viewBox="0 0 40 40" class=iconEdit_Z9Sw aria-hidden=true><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"/></g></svg>编辑此页</a></div><div class="col lastUpdated_JAkA"></div></div></footer></article><nav class="docusaurus-mt-lg pagination-nav" aria-label=文件选项卡><a class="pagination-nav__link pagination-nav__link--prev" href=/zh-CN/docs/guide/cpp/native_serialization><div class=pagination-nav__sublabel>上一页</div><div class=pagination-nav__label>原生序列化</div></a><a class="pagination-nav__link 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