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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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<td class="paramtype">const <a class="el" href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522">value_t</a>&#160;</td>
<td class="paramname"><em>value</em></td><td>)</td>
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<p>Create an empty JSON value with a given type. The value will be default initialized with an empty value which depends on the type:</p>
<table class="doxtable">
<tr>
<th>Value type </th><th>initial value </th></tr>
<tr>
<td>null </td><td><code>null</code> </td></tr>
<tr>
<td>boolean </td><td><code>false</code> </td></tr>
<tr>
<td>string </td><td><code>""</code> </td></tr>
<tr>
<td>number </td><td><code>0</code> </td></tr>
<tr>
<td>object </td><td><code>{}</code> </td></tr>
<tr>
<td>array </td><td><code>[]</code> </td></tr>
</table>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>the type of the value to create</td></tr>
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<dl class="section user"><dt>Complexity</dt><dd>Constant.</dd></dl>
<dl class="exception"><dt>Exceptions</dt><dd>
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<tr><td class="paramname">std::bad_alloc</td><td>if allocation for object, array, or string value fails (thrown by the constructors of <a class="el" href="unionnlohmann_1_1basic__json_1_1json__value.html">json_value</a>)</td></tr>
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<dl class="section user"><dt>Example</dt><dd>The following code shows the constructor for different <a class="el" href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522">value_t</a> values <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 the different JSON values with default 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> j_null(<a class="code" href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522a37a6259cc0c1dae299a7866489dff0bd">json::value_t::null</a>);</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> j_boolean(<a class="code" href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522a84e2c64f38f78ba3ea5c905ab5a2da27">json::value_t::boolean</a>);</div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160; <a class="code" href="classnlohmann_1_1basic__json.html">json</a> j_number_integer(<a class="code" href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522a5763da164f8659d94a56e29df64b4bcc">json::value_t::number_integer</a>);</div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160; <a class="code" href="classnlohmann_1_1basic__json.html">json</a> j_number_float(<a class="code" href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522ad9966ecb59667235a57b4b999a649eef">json::value_t::number_float</a>);</div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160; <a class="code" href="classnlohmann_1_1basic__json.html">json</a> j_object(<a class="code" href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522aa8cfde6331bd59eb2ac96f8911c4b666">json::value_t::object</a>);</div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160; <a class="code" href="classnlohmann_1_1basic__json.html">json</a> j_array(<a class="code" href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522af1f713c9e000f5d3f280adbd124df4f5">json::value_t::array</a>);</div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160; <a class="code" href="classnlohmann_1_1basic__json.html">json</a> j_string(<a class="code" href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522ab45cffe084dd3d20d928bee85e7b0f21">json::value_t::string</a>);</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160; <span class="comment">// serialize the JSON values</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160; std::cout &lt;&lt; j_null &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160; std::cout &lt;&lt; j_boolean &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160; std::cout &lt;&lt; j_number_integer &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160; std::cout &lt;&lt; j_number_float &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160; std::cout &lt;&lt; j_object &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; std::cout &lt;&lt; j_array &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160; std::cout &lt;&lt; j_string &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</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>
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<div class="ttc" id="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522_html_a231b02148577b69a154b2ce2c87a5522aa8cfde6331bd59eb2ac96f8911c4b666"><div class="ttname"><a href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522aa8cfde6331bd59eb2ac96f8911c4b666">nlohmann::basic_json::value_t::object</a></div><div class="ttdoc">object (unordered set of name/value pairs) </div></div>
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<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 class="ttc" id="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522_html_a231b02148577b69a154b2ce2c87a5522ab45cffe084dd3d20d928bee85e7b0f21"><div class="ttname"><a href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522ab45cffe084dd3d20d928bee85e7b0f21">nlohmann::basic_json::value_t::string</a></div><div class="ttdoc">string value </div></div>
<div class="ttc" id="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522_html_a231b02148577b69a154b2ce2c87a5522af1f713c9e000f5d3f280adbd124df4f5"><div class="ttname"><a href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522af1f713c9e000f5d3f280adbd124df4f5">nlohmann::basic_json::value_t::array</a></div><div class="ttdoc">array (ordered collection of values) </div></div>
<div class="ttc" id="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522_html_a231b02148577b69a154b2ce2c87a5522a37a6259cc0c1dae299a7866489dff0bd"><div class="ttname"><a href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522a37a6259cc0c1dae299a7866489dff0bd">nlohmann::basic_json::value_t::null</a></div><div class="ttdoc">null value </div></div>
<div class="ttc" id="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522_html_a231b02148577b69a154b2ce2c87a5522ad9966ecb59667235a57b4b999a649eef"><div class="ttname"><a href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522ad9966ecb59667235a57b4b999a649eef">nlohmann::basic_json::value_t::number_float</a></div><div class="ttdoc">number value (floating-point) </div></div>
<div class="ttc" id="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522_html_a231b02148577b69a154b2ce2c87a5522a84e2c64f38f78ba3ea5c905ab5a2da27"><div class="ttname"><a href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522a84e2c64f38f78ba3ea5c905ab5a2da27">nlohmann::basic_json::value_t::boolean</a></div><div class="ttdoc">boolean value </div></div>
<div class="ttc" id="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522_html_a231b02148577b69a154b2ce2c87a5522a5763da164f8659d94a56e29df64b4bcc"><div class="ttname"><a href="classnlohmann_1_1basic__json_a231b02148577b69a154b2ce2c87a5522.html#a231b02148577b69a154b2ce2c87a5522a5763da164f8659d94a56e29df64b4bcc">nlohmann::basic_json::value_t::number_integer</a></div><div class="ttdoc">number value (integer) </div></div>
</div><!-- fragment --> Output: <pre class="fragment">null
false
0
0
{}
[]
""
</pre> The example code above can be translated with<pre class="fragment">g++ -std=c++11 -Isrc doc/examples/basic_json__value_t.cpp -o basic_json__value_t </pre>. </dd></dl>
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