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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>
<div class="memtemplate">
template&lt;typename CompatibleNumberFloatType , typename = typename std::enable_if&lt; std::is_constructible&lt;number_float_t, CompatibleNumberFloatType&gt;::value and std::is_floating_point&lt;CompatibleNumberFloatType&gt;::value&gt;::type&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>
<td>(</td>
<td class="paramtype">const CompatibleNumberFloatType&#160;</td>
<td class="paramname"><em>value</em></td><td>)</td>
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<p>Create an floating-point number JSON value with a given content. This constructor allows any type that can be used to construct values of type <a class="el" href="classnlohmann_1_1basic__json_aacf6c869f6a9c66ac1bc99e93f310044.html#aacf6c869f6a9c66ac1bc99e93f310044">number_float_t</a>. Examples may include the types <code>float</code>.</p>
<dl class="tparams"><dt>Template Parameters</dt><dd>
<table class="tparams">
<tr><td class="paramname">CompatibleNumberFloatType</td><td>a floating-point type which is compatible to <a class="el" href="classnlohmann_1_1basic__json_aacf6c869f6a9c66ac1bc99e93f310044.html#aacf6c869f6a9c66ac1bc99e93f310044">number_float_t</a>.</td></tr>
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</dd>
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<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">value</td><td>a floating-point to create a JSON number from</td></tr>
</table>
</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>RFC 7159 <a href="http://www.rfc-editor.org/rfc/rfc7159.txt">http://www.rfc-editor.org/rfc/rfc7159.txt</a>, section 6 disallows NaN values: <blockquote class="doxtable">
<p>Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted. </p>
</blockquote>
In case the parameter <em>value</em> is not a number, a JSON null value is created instead.</dd></dl>
<dl class="section user"><dt>Complexity</dt><dd>Constant.</dd></dl>
<dl class="section user"><dt>Example</dt><dd>The example below shows the construction of several JSON floating-point number values from compatible types. <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 values of different floating-point types</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160; <span class="keywordtype">float</span> f42 = 42.23;</div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160; <span class="keywordtype">float</span> f_nan = 1.0f / 0.0f;</div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160; <span class="keywordtype">double</span> f23 = 23.42;</div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;</div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160; <span class="comment">// create JSON numbers</span></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> j42(f42);</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_nan(f_nan);</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160; <a class="code" href="classnlohmann_1_1basic__json.html">json</a> j23(f23);</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160; <span class="comment">// serialize the JSON numbers</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160; std::cout &lt;&lt; j42 &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_nan &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; j23 &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</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: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>
</div><!-- fragment --> Output: <pre class="fragment">42.2299995422363
null
23.42
</pre> The example code above can be translated with<pre class="fragment">g++ -std=c++11 -Isrc doc/examples/basic_json__CompatibleNumberFloatType.cpp -o basic_json__CompatibleNumberFloatType </pre>.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="classnlohmann_1_1basic__json_a80a89ddbe4cb7ef15b049febee208cc8.html#a80a89ddbe4cb7ef15b049febee208cc8" title="create a floating-point number (explicit) ">basic_json(const number_float_t)</a> </dd></dl>
Update
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