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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="memname"><a class="el" href="classnlohmann_1_1basic__json.html">nlohmann::basic_json</a>::<a class="el" href="classnlohmann_1_1basic__json.html">basic_json</a> </td>
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<p>Create a <code>null</code> JSON value. This is the implicit version of the <code>null</code> value constructor as it takes no parameters.</p>
<dl class="section user"><dt>Complexity</dt><dd>Constant.</dd></dl>
<dl class="section user"><dt>Requirements</dt><dd>This function satisfies the Container requirements:<ul>
<li>The complexity is constant.</li>
<li>As postcondition, it holds: <code><a class="el" href="classnlohmann_1_1basic__json_a5a2d4dbcdbc8ea065b87daf52cd786b9.html#a5a2d4dbcdbc8ea065b87daf52cd786b9" title="create a null object (implicitly) ">basic_json()</a>.<a class="el" href="classnlohmann_1_1basic__json_a572cdf681c75b42c2bc38a1fbe993eca.html#a572cdf681c75b42c2bc38a1fbe993eca" title="checks whether the container is empty ">empty()</a> == true</code>.</li>
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<dl class="section user"><dt>Example</dt><dd>The following code shows the constructor for a <code>null</code> JSON value. <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 a JSON value with default null value</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> j;</div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;</div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160; <span class="comment">// serialize the JSON null value</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160; std::cout &lt;&lt; j &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;}</div>
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<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:121</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:56</div></div>
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</div><!-- fragment --> Output: <pre class="fragment">null
</pre> The example code above can be translated with<pre class="fragment">g++ -std=c++11 -Isrc doc/examples/basic_json.cpp -o basic_json </pre>.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="classnlohmann_1_1basic__json_a930e14150ffa067bcf56d35cb00271e1.html#a930e14150ffa067bcf56d35cb00271e1" title="create a null object (explicitly) ">basic_json(std::nullptr_t)</a> </dd></dl>
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