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<span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>CustomBaseClass</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=kt>void</span>
<span class=o>&gt;</span>
<span class=k>class</span><span class=w> </span><span class=nc>basic_json</span><span class=p>;</span>
</code></pre></div> <h2 id=template-parameters>Template parameters<a class=headerlink href=#template-parameters title="Permanent link">&para;</a></h2> <table> <thead> <tr> <th>Template parameter</th> <th>Description</th> <th>Derived type</th> </tr> </thead> <tbody> <tr> <td><code>ObjectType</code></td> <td>type for <abbr title="JavaScript Object Notation">JSON</abbr> objects</td> <td><a href=object_t/ ><code>object_t</code></a></td> </tr> <tr> <td><code>ArrayType</code></td> <td>type for <abbr title="JavaScript Object Notation">JSON</abbr> arrays</td> <td><a href=array_t/ ><code>array_t</code></a></td> </tr> <tr> <td><code>StringType</code></td> <td>type for <abbr title="JavaScript Object Notation">JSON</abbr> strings and object keys</td> <td><a href=string_t/ ><code>string_t</code></a></td> </tr> <tr> <td><code>BooleanType</code></td> <td>type for <abbr title="JavaScript Object Notation">JSON</abbr> booleans</td> <td><a href=boolean_t/ ><code>boolean_t</code></a></td> </tr> <tr> <td><code>NumberIntegerType</code></td> <td>type for <abbr title="JavaScript Object Notation">JSON</abbr> integer numbers</td> <td><a href=number_integer_t/ ><code>number_integer_t</code></a></td> </tr> <tr> <td><code>NumberUnsignedType</code></td> <td>type for <abbr title="JavaScript Object Notation">JSON</abbr> unsigned integer numbers</td> <td><a href=number_unsigned_t/ ><code>number_unsigned_t</code></a></td> </tr> <tr> <td><code>NumberFloatType</code></td> <td>type for <abbr title="JavaScript Object Notation">JSON</abbr> floating-point numbers</td> <td><a href=number_float_t/ ><code>number_float_t</code></a></td> </tr> <tr> <td><code>AllocatorType</code></td> <td>type of the allocator to use</td> <td></td> </tr> <tr> <td><code>JSONSerializer</code></td> <td>the serializer to resolve internal calls to <code>to_json()</code> and <code>from_json()</code></td> <td><a href=json_serializer/ ><code>json_serializer</code></a></td> </tr> <tr> <td><code>BinaryType</code></td> <td>type for binary arrays</td> <td><a href=binary_t/ ><code>binary_t</code></a></td> </tr> <tr> <td><code>CustomBaseClass</code></td> <td>extension point for user code</td> <td><a href=json_base_class_t/ ><code>json_base_class_t</code></a></td> </tr> </tbody> </table> <p>The library imposes a number of requirements on these types that are not expressed as C++ concepts, such as the container operations <code>object_t</code> and <code>array_t</code> must provide, or the fact that <code>StringType</code> must be <code>char</code>-based. They are collected in <a href=../../features/types/template_parameters/ >Template Parameter Requirements</a>.</p> <h2 id=specializations>Specializations<a class=headerlink href=#specializations title="Permanent link">&para;</a></h2> <ul> <li><a href=../json/ ><strong>json</strong></a> - default specialization</li> <li><a href=../ordered_json/ ><strong>ordered_json</strong></a> - a specialization that maintains the insertion order of object keys</li> </ul> <h2 id=iterator-invalidation>Iterator invalidation<a class=headerlink href=#iterator-invalidation title="Permanent link">&para;</a></h2> <p>All operations that add values to an <strong>array</strong> (<a href=push_back/ ><code>push_back</code></a> , <a href=operator%2B%3D/ ><code>operator+=</code></a>, <a href=emplace_back/ ><code>emplace_back</code></a>, <a href=insert/ ><code>insert</code></a>, and <a href=operator%5B%5D/ ><code>operator[]</code></a> for a non-existing index) can yield a reallocation, in which case all iterators (including the <a href=end/ ><code>end()</code></a> iterator) and all references to the elements are invalidated.</p> <p>For <a href=../ordered_json/ ><code>ordered_json</code></a>, also all operations that add a value to an <strong>object</strong> (<a href=push_back/ ><code>push_back</code></a>, <a href=operator%2B%3D/ ><code>operator+=</code></a>, <a href=emplace/ ><code>emplace</code></a>, <a href=insert/ ><code>insert</code></a>, <a href=update/ ><code>update</code></a>, and <a href=operator%5B%5D/ ><code>operator[]</code></a> for a non-existing key) can yield a reallocation, in which case all iterators (including the <a href=end/ ><code>end()</code></a> iterator) and all references to the elements are invalidated.</p> <h2 id=requirements>Requirements<a class=headerlink href=#requirements title="Permanent link">&para;</a></h2> <p>The class satisfies the following concept requirements:</p> <h3 id=basic>Basic<a class=headerlink href=#basic title="Permanent link">&para;</a></h3> <ul> <li><a href="https://en.cppreference.com/w/cpp/named_req/DefaultConstructible">DefaultConstructible</a>: <abbr title="JavaScript Object Notation">JSON</abbr> values can be default-constructed. The result will be a <abbr title="JavaScript Object Notation">JSON</abbr> null value.</li> <li><a href="https://en.cppreference.com/w/cpp/named_req/MoveConstructible">MoveConstructible</a>: A <abbr title="JavaScript Object Notation">JSON</abbr> value can be constructed from an rvalue arLine truncated
</code></pre></div> <h2 id=template-parameters>Template parameters<a class=headerlink href=#template-parameters title="Permanent link">&para;</a></h2> <table> <thead> <tr> <th>Template parameter</th> <th>Description</th> <th>Derived type</th> </tr> </thead> <tbody> <tr> <td><code>ObjectType</code></td> <td>type for <abbr title="JavaScript Object Notation">JSON</abbr> objects</td> <td><a href=object_t/ ><code>object_t</code></a></td> </tr> <tr> <td><code>ArrayType</code></td> <td>type for <abbr title="JavaScript Object Notation">JSON</abbr> arrays</td> <td><a href=array_t/ ><code>array_t</code></a></td> </tr> <tr> <td><code>StringType</code></td> <td>type for <abbr title="JavaScript Object Notation">JSON</abbr> strings and object keys</td> <td><a href=string_t/ ><code>string_t</code></a></td> </tr> <tr> <td><code>BooleanType</code></td> <td>type for <abbr title="JavaScript Object Notation">JSON</abbr> booleans</td> <td><a href=boolean_t/ ><code>boolean_t</code></a></td> </tr> <tr> <td><code>NumberIntegerType</code></td> <td>type for <abbr title="JavaScript Object Notation">JSON</abbr> integer numbers</td> <td><a href=number_integer_t/ ><code>number_integer_t</code></a></td> </tr> <tr> <td><code>NumberUnsignedType</code></td> <td>type for <abbr title="JavaScript Object Notation">JSON</abbr> unsigned integer numbers</td> <td><a href=number_unsigned_t/ ><code>number_unsigned_t</code></a></td> </tr> <tr> <td><code>NumberFloatType</code></td> <td>type for <abbr title="JavaScript Object Notation">JSON</abbr> floating-point numbers</td> <td><a href=number_float_t/ ><code>number_float_t</code></a></td> </tr> <tr> <td><code>AllocatorType</code></td> <td>type of the allocator to use</td> <td></td> </tr> <tr> <td><code>JSONSerializer</code></td> <td>the serializer to resolve internal calls to <code>to_json()</code> and <code>from_json()</code></td> <td><a href=json_serializer/ ><code>json_serializer</code></a></td> </tr> <tr> <td><code>BinaryType</code></td> <td>type for binary arrays</td> <td><a href=binary_t/ ><code>binary_t</code></a></td> </tr> <tr> <td><code>CustomBaseClass</code></td> <td>extension point for user code</td> <td><a href=json_base_class_t/ ><code>json_base_class_t</code></a></td> </tr> </tbody> </table> <p>The library imposes a number of requirements on these types that are not expressed as C++ concepts, such as the container operations <code>object_t</code> and <code>array_t</code> must provide, or the fact that <code>StringType</code> must be <code>char</code>-based. They are collected in <a href=../../features/types/template_parameters/ >Template Parameter Requirements</a>.</p> <h2 id=specializations>Specializations<a class=headerlink href=#specializations title="Permanent link">&para;</a></h2> <ul> <li><a href=../json/ ><strong>json</strong></a> - default specialization</li> <li><a href=../ordered_json/ ><strong>ordered_json</strong></a> - a specialization that maintains the insertion order of object keys</li> </ul> <h2 id=iterator-invalidation>Iterator invalidation<a class=headerlink href=#iterator-invalidation title="Permanent link">&para;</a></h2> <p>All operations that add values to an <strong>array</strong> (<a href=push_back/ ><code>push_back</code></a> , <a href=operator%2B%3D/ ><code>operator+=</code></a>, <a href=emplace_back/ ><code>emplace_back</code></a>, <a href=insert/ ><code>insert</code></a>, and <a href=operator%5B%5D/ ><code>operator[]</code></a> for a non-existing index) can yield a reallocation, in which case all iterators (including the <a href=end/ ><code>end()</code></a> iterator) and all references to the elements are invalidated.</p> <p>For <a href=../ordered_json/ ><code>ordered_json</code></a>, also all operations that add a value to an <strong>object</strong> (<a href=push_back/ ><code>push_back</code></a>, <a href=operator%2B%3D/ ><code>operator+=</code></a>, <a href=emplace/ ><code>emplace</code></a>, <a href=insert/ ><code>insert</code></a>, <a href=update/ ><code>update</code></a>, and <a href=operator%5B%5D/ ><code>operator[]</code></a> for a non-existing key) can yield a reallocation, in which case all iterators (including the <a href=end/ ><code>end()</code></a> iterator) and all references to the elements are invalidated.</p> <h2 id=requirements>Requirements<a class=headerlink href=#requirements title="Permanent link">&para;</a></h2> <p>The class satisfies the following concept requirements:</p> <h3 id=basic>Basic<a class=headerlink href=#basic title="Permanent link">&para;</a></h3> <ul> <li><a href="https://en.cppreference.com/w/cpp/named_req/DefaultConstructible">DefaultConstructible</a>: <abbr title="JavaScript Object Notation">JSON</abbr> values can be default-constructed. The result will be a <abbr title="JavaScript Object Notation">JSON</abbr> null value.</li> <li><a href="https://en.cppreference.com/w/cpp/named_req/MoveConstructible">MoveConstructible</a>: A <abbr title="JavaScript Object Notation">JSON</abbr> value can be constructed from an rvalue arLine truncated
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;iomanip&gt;</span>
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json.hpp&gt;</span>
@@ -78,4 +78,4 @@
<span class=w> </span><span class=nt>"pi"</span><span class=p>:</span><span class=w> </span><span class=mf>3.141</span><span class=p>,</span>
<span class=w> </span><span class=nt>"size"</span><span class=p>:</span><span class=w> </span><span class=mi>8</span>
<span class=p>}</span>
</code></pre></div> </details> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">&para;</a></h2> <ul> <li><a href="https://tools.ietf.org/html/rfc8259"><abbr title="Request for Comments">RFC</abbr> 8259: The JavaScript Object Notation (<abbr title="JavaScript Object Notation">JSON</abbr>) Data Interchange Format</a></li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">&para;</a></h2> <ul> <li>Added in version 1.0.0.</li> </ul> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 12, 2026 07:33:43 UTC">October 12, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright &copy; 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</code></pre></div> </details> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">&para;</a></h2> <ul> <li><a href="https://tools.ietf.org/html/rfc8259"><abbr title="Request for Comments">RFC</abbr> 8259: The JavaScript Object Notation (<abbr title="JavaScript Object Notation">JSON</abbr>) Data Interchange Format</a></li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">&para;</a></h2> <ul> <li>Added in version 1.0.0.</li> </ul> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 14, 2026 15:40:55 UTC">October 14, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright &copy; 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