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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/api/basic_json/json_base_class_t/" rel="canonical"><link href=../items/ rel=prev><link href=../json_serializer/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>json_base_class_t - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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</code></pre></div> <p>The base class used to inject custom functionality into each instance of <code>basic_json</code>. Examples of such functionality might be metadata, additional member functions (e.g., visitors), or other application-specific code.</p> <h2 id=template-parameters>Template parameters<a class=headerlink href=#template-parameters title="Permanent link">¶</a></h2> <dl> <dt><code>CustomBaseClass</code></dt> <dd>the base class to be added to <code>basic_json</code></dd> </dl> <h2 id=notes>Notes<a class=headerlink href=#notes title="Permanent link">¶</a></h2> <h3 id=default-type>Default type<a class=headerlink href=#default-type title="Permanent link">¶</a></h3> <p>The default value for <code>CustomBaseClass</code> is <code>void</code>. In this case, an <a href="https://en.cppreference.com/w/cpp/language/ebo">empty base class</a> is used and no additional functionality is injected.</p> <h3 id=limitations>Limitations<a class=headerlink href=#limitations title="Permanent link">¶</a></h3> <p>The type <code>CustomBaseClass</code> has to be a default-constructible, non-<code>final</code> class. <code>basic_json</code> only supports copy/move construction/assignment if <code>CustomBaseClass</code> does so as well. A <code>CustomBaseClass</code> with non-static data members forfeits <code>basic_json</code>'s <a href="https://en.cppreference.com/w/cpp/named_req/StandardLayoutType">standard layout</a> guarantee. See <a href=../../../features/types/template_parameters/#custombaseclass>Template Parameter Requirements</a>.</p> <h4 id=name-conflicts>Name conflicts<a class=headerlink href=#name-conflicts title="Permanent link">¶</a></h4> <p>Since <code>basic_json</code> derives from <code>CustomBaseClass</code>, members of <code>basic_json</code> hide members of <code>CustomBaseClass</code> with the same name. Hidden members remain accessible via <a href=../as_base_class/ ><code>as_base_class</code></a> or by casting the value to <code>json_base_class_t</code>.</p> <div class="admonition warning"> <p class=admonition-title>Avoid generic member names</p> <p>Future versions of the library may add members to <code>basic_json</code> that hide members of <code>CustomBaseClass</code> that are accessible today. To reduce the risk of such conflicts, avoid generic names for the members of <code>CustomBaseClass</code>, for instance by using a distinctive prefix.</p> </div> <h2 id=examples>Examples<a class=headerlink href=#examples title="Permanent link">¶</a></h2> <details class=example> <summary>Example</summary> <p>The following code shows how to inject custom data and methods for each node.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
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<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
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