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template&lt;template&lt; typename U, typename V, typename...Args &gt; class ObjectType = std::map, template&lt; typename U, typename...Args &gt; class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = int64_t, class NumberFloatType = double, template&lt; typename U &gt; class AllocatorType = std::allocator&gt; </div>
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<td class="paramtype"><a class="el" href="classnlohmann_1_1basic__json.html">basic_json</a>&#160;</td>
<td class="paramname"><em>other</em></td><td>)</td>
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<p>Copy assignment operator. Copies a JSON value via the "copy and swap" strategy: It is expressed in terms of the copy constructor, destructor, and the <a class="el" href="classnlohmann_1_1basic__json_afb19d4669daf3c4347763f043471b835.html#afb19d4669daf3c4347763f043471b835" title="exchanges the values ">swap()</a> member function.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">other</td><td>value to copy from</td></tr>
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<dl class="section user"><dt>Complexity</dt><dd>Linear.</dd></dl>
<dl class="section user"><dt>Requirements</dt><dd>This function satisfies the Container requirements:<ul>
<li>The complexity is linear.</li>
</ul>
</dd></dl>
<dl class="section user"><dt>Example</dt><dd>The code below shows and example for the copy assignment. It creates a copy of value <code>a</code> which is then swapped with <code>b</code>. Finally, the copy of <code>a</code> (which is the null value after the swap) is destroyed. <div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="preprocessor">#include &lt;json.hpp&gt;</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;</div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="keyword">using namespace </span><a class="code" href="namespacenlohmann.html">nlohmann</a>;</div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;</div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="keywordtype">int</span> main()</div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;{</div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160; <span class="comment">// create JSON values</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160; <a class="code" href="classnlohmann_1_1basic__json.html">json</a> a = 23;</div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160; <a class="code" href="classnlohmann_1_1basic__json.html">json</a> b = 42;</div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;</div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160; <span class="comment">// copy-assign a to b</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160; b = a;</div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;</div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160; <span class="comment">// serialize the JSON arrays</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160; std::cout &lt;&lt; a &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160; std::cout &lt;&lt; b &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;}</div>
<div class="ttc" id="classnlohmann_1_1basic__json_html"><div class="ttname"><a href="classnlohmann_1_1basic__json.html">nlohmann::basic_json</a></div><div class="ttdoc">a class to store JSON values </div><div class="ttdef"><b>Definition:</b> json.hpp:113</div></div>
<div class="ttc" id="namespacenlohmann_html"><div class="ttname"><a href="namespacenlohmann.html">nlohmann</a></div><div class="ttdoc">namespace for Niels Lohmann </div><div class="ttdef"><b>Definition:</b> json.hpp:49</div></div>
</div><!-- fragment --> Output: <pre class="fragment">23
23
</pre> The example code above can be translated with<pre class="fragment">g++ -std=c++11 -Isrc doc/examples/basic_json__copyassignment.cpp -o basic_json__copyassignment </pre>. </dd></dl>
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