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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_document/push_back/" rel="canonical"><link href=../parse_copy/ rel=prev><link href=../read/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>push_back - 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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<span class=n>view_type</span><span class=w> </span><span class=n>push_back</span><span class=p>(</span><span class=n>view_type</span><span class=w> </span><span class=n>array</span><span class=p>,</span><span class=w> </span><span class=n>V</span><span class=o>&amp;&amp;</span><span class=w> </span><span class=n>value</span><span class=p>);</span>
</code></pre></div> <p>Appends <code>value</code> as a new last element of <code>array</code>. A <a href=../../basic_json_view/is_null/ >null</a> <code>array</code> first becomes an empty array, the same way <a href=../set/ ><code>set</code></a> turns a null <code>object</code> into an empty object.</p> <p><code>value</code> is accepted three ways: a <a href=../../basic_json_view/ ><code>basic_json_view</code></a> of <em>any</em> document -- read-only or editable, and it does not have to be <code>array</code>'s own document -- which is copied so that nothing is shared with the source document afterward; a <code>BasicJsonType</code> value; or anything <code>BasicJsonType</code> can be constructed from (numbers, strings, <code class=highlight><span class=kt>bool</span></code>, <code class=highlight><span class=nb>nullptr</span></code>, containers, ...).</p> <p>Only an <strong>editable</strong> document (<code class=highlight><span class=n>Editable</span><span class=w> </span><span class=o>==</span><span class=w> </span><span class=nb>true</span></code>, e.g. <a href=../../json_editable_document/ ><code>json_editable_document</code></a>) has <code>push_back</code>; calling it on a read-only <code>basic_json_document</code> fails to compile (<code class=highlight><span class=k>static_assert</span></code>).</p> <h2 id=template-parameters>Template parameters<a class=headerlink href=#template-parameters title="Permanent link">&para;</a></h2> <dl> <dt><code>V</code></dt> <dd>the type of <code>value</code>, deduced; see above for what is accepted.</dd> </dl> <h2 id=parameters>Parameters<a class=headerlink href=#parameters title="Permanent link">&para;</a></h2> <dl> <dt><code>array</code> (in)</dt> <dd>the array (or null value) to append to</dd> <dt><code>value</code> (in)</dt> <dd>the value to append</dd> </dl> <h2 id=return-value>Return value<a class=headerlink href=#return-value title="Permanent link">&para;</a></h2> <p>a view of the new last element of <code>array</code>, now holding <code>value</code></p> <h2 id=exception-safety>Exception safety<a class=headerlink href=#exception-safety title="Permanent link">&para;</a></h2> <p>Basic exception safety: <code>value</code> is fully encoded -- including the checks below -- into storage owned by the document before anything already reachable from <a href=../root/ ><code>root()</code></a> is touched, so a failure while encoding <code>value</code> (an invalid argument, or <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>bad_alloc</span></code>) leaves the document completely unchanged, other than memory allocated for the encoding that is not reclaimed. A failure of a later allocation -- while <code>array</code> switches from its parsed layout to a growable block, or while that block grows, see <a href=#notes>Notes</a> -- can still leave a partial effect, such as a null <code>array</code> argument already turned into an empty array even though <code>value</code> itself was not appended.</p> <h2 id=exceptions>Exceptions<a class=headerlink href=#exceptions title="Permanent link">&para;</a></h2> <p>Throws <a href=../../../home/exceptions/#jsonexceptiontype_error308><code>type_error.308</code></a> if <code>array</code> is neither an array nor null -- the same message <a href=../../basic_json/push_back/ ><code>BasicJsonType::push_back</code></a> throws for the same type. Throws <a href=../../../home/exceptions/#jsonexceptioninvalid_iterator202><code>invalid_iterator.202</code></a> ("view does not belong to this document") if <code>array</code> is a <a href=../../basic_json_view/is_discarded/ >discarded</a> view or a view of a <em>different</em> document. Throws <a href=../../../home/exceptions/#jsonexceptiontype_error302><code>type_error.302</code></a> if <code>value</code> is a <a href=../../basic_json_view/is_discarded/ >discarded</a> view or a <a href=../../basic_json/is_discarded/ >discarded</a> <code>BasicJsonType</code> value, and <a href=../../../home/exceptions/#jsonexceptiontype_error319><code>type_error.319</code></a> if <code>value</code> is (or contains) a binary value -- <code>BasicJsonType</code> can hold one, but a <code>json_document</code> cannot. Throws <a href=../../../home/exceptions/#jsonexceptiontype_error316><code>type_error.316</code></a> if <code>value</code> is (or contains) a string that is not valid <abbr title="Unicode Transformation Format">UTF</abbr>-8, with the same message <a href=../../basic_json/dump/ ><code>BasicJsonType::dump()</code></a> gives for that string.</p> <h2 id=complexity>Complexity<a class=headerlink href=#complexity title="Permanent link">&para;</a></h2> <p>Amortized constant, plus time linear in the size of <code>value</code> to encode it into the document's storage (constant for a scalar, linear in the number of nested values for an array or object): the elements of <code>array</code> move to a growable block of links the first time it is appended to (or <a href=../set/ ><code>set</code></Line truncated
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json_view.hpp&gt;</span>
<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
<span class=k>using</span><span class=w> </span><span class=n>json_editable_document</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json_editable_document</span><span class=p>;</span>
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
<span class=p>{</span>
<span class=w> </span><span class=c1>// "events" starts out null -- the first push_back() turns it into an</span>
<span class=w> </span><span class=c1>// array, exactly like set() turns a null object member into an object</span>
<span class=w> </span><span class=n>json_editable_document</span><span class=w> </span><span class=n>doc</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>json_editable_document</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=sa>R</span><span class=s>"</span><span class=dl>(</span><span class=s>{"source": "sensor-1", "events": null}</span><span class=dl>)</span><span class=s>"</span><span class=p>);</span>
<span class=w> </span><span class=k>const</span><span class=w> </span><span class=k>auto</span><span class=w> </span><span class=n>first</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>doc</span><span class=p>.</span><span class=n>push_back</span><span class=p>(</span><span class=n>doc</span><span class=p>.</span><span class=n>root</span><span class=p>()[</span><span class=s>"events"</span><span class=p>],</span><span class=w> </span><span class=n>json</span><span class=p>{{</span><span class=s>"type"</span><span class=p>,</span><span class=w> </span><span class=s>"start"</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"t"</span><span class=p>,</span><span class=w> </span><span class=mi>0</span><span class=p>}});</span>
<span class=w> </span><span class=k>for</span><span class=w> </span><span class=p>(</span><span class=kt>int</span><span class=w> </span><span class=n>t</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>1</span><span class=p>;</span><span class=w> </span><span class=n>t</span><span class=w> </span><span class=o>&lt;=</span><span class=w> </span><span class=mi>3</span><span class=p>;</span><span class=w> </span><span class=o>++</span><span class=n>t</span><span class=p>)</span>
<span class=w> </span><span class=p>{</span>
<span class=w> </span><span class=n>doc</span><span class=p>.</span><span class=n>push_back</span><span class=p>(</span><span class=n>doc</span><span class=p>.</span><span class=n>root</span><span class=p>()[</span><span class=s>"events"</span><span class=p>],</span><span class=w> </span><span class=n>json</span><span class=p>{{</span><span class=s>"type"</span><span class=p>,</span><span class=w> </span><span class=s>"tick"</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"t"</span><span class=p>,</span><span class=w> </span><span class=n>t</span><span class=p>}});</span>
<span class=w> </span><span class=p>}</span>
<span class=w> </span><span class=c1>// push_back() never moves an existing element: a view taken from an</span>
<span class=w> </span><span class=c1>// earlier call still refers to the same element after later ones</span>
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>first</span><span class=p>.</span><span class=n>dump</span><span class=p>()</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>doc</span><span class=p>.</span><span class=n>root</span><span class=p>()[</span><span class=s>"events"</span><span class=p>].</span><span class=n>size</span><span class=p>()</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>doc</span><span class=p>.</span><span class=n>root</span><span class=p>().</span><span class=n>dump</span><span class=p>(</span><span class=mi>2</span><span class=p>)</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
<span class=p>}</span>
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=p>{</span><span class=nt>"t"</span><span class=p>:</span><span class=mi>0</span><span class=p>,</span><span class=nt>"type"</span><span class=p>:</span><span class=s2>"start"</span><span class=p>}</span>
<span class=mi>4</span>
<span class=p>{</span>
<span class=w> </span><span class=nt>"source"</span><span class=p>:</span><span class=w> </span><span class=s2>"sensor-1"</span><span class=p>,</span>
<span class=w> </span><span class=nt>"events"</span><span class=p>:</span><span class=w> </span><span class=p>[</span>
<span class=w> </span><span class=p>{</span>
<span class=w> </span><span class=nt>"t"</span><span class=p>:</span><span class=w> </span><span class=mi>0</span><span class=p>,</span>
<span class=w> </span><span class=nt>"type"</span><span class=p>:</span><span class=w> </span><span class=s2>"start"</span>
<span class=w> </span><span class=p>},</span>
<span class=w> </span><span class=p>{</span>
<span class=w> </span><span class=nt>"t"</span><span class=p>:</span><span class=w> </span><span class=mi>1</span><span class=p>,</span>
<span class=w> </span><span class=nt>"type"</span><span class=p>:</span><span class=w> </span><span class=s2>"tick"</span>
<span class=w> </span><span class=p>},</span>
<span class=w> </span><span class=p>{</span>
<span class=w> </span><span class=nt>"t"</span><span class=p>:</span><span class=w> </span><span class=mi>2</span><span class=p>,</span>
<span class=w> </span><span class=nt>"type"</span><span class=p>:</span><span class=w> </span><span class=s2>"tick"</span>
<span class=w> </span><span class=p>},</span>
<span class=w> </span><span class=p>{</span>
<span class=w> </span><span class=nt>"t"</span><span class=p>:</span><span class=w> </span><span class=mi>3</span><span class=p>,</span>
<span class=w> </span><span class=nt>"type"</span><span class=p>:</span><span class=w> </span><span class=s2>"tick"</span>
<span class=w> </span><span class=p>}</span>
<span class=w> </span><span class=p>]</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=../set/ >set</a> - replace a value, or set an object member, an array element, or the value a <abbr title="JavaScript Object Notation">JSON</abbr> pointer refers to</li> <li><a href=../insert/ >insert</a> - insert an element into an array before a given position</li> <li><a href=../erase/ >erase</a> - remove an object member, an array element, or the value a <abbr title="JavaScript Object Notation">JSON</abbr> pointer refers to</li> <li><a href=../root/ >root</a> - the view of the root value</li> <li><a href=../../basic_json/push_back/ ><code>BasicJsonType::push_back</code></a> - the corresponding function of <code>basic_json</code></li> <li><a href=../#edits>Edits</a> - what an edit guarantees, for every overload</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 3.13.0 <span class=unreleased-version title="Not part of a release yet; 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