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template<template< typename U, typename V, typename...Args > class ObjectType = std::map, template< typename U, typename...Args > class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = int64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator> </div>
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<td class="mlabels-left">
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<table class="memname">
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<td class="memname">std::ostream& operator<< </td>
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<td>(</td>
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<td class="paramtype">std::ostream & </td>
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<td class="paramname"><em>o</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="classnlohmann_1_1basic__json.html">basic_json</a> & </td>
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<td class="paramname"><em>j</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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<span class="mlabels"><span class="mlabel">friend</span></span> </td>
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</div><div class="memdoc">
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<p>Serialize the given JSON value <em>j</em> to the output stream <em>o</em>. The JSON value will be serialized using the <a class="el" href="classnlohmann_1_1basic__json_a1f6b988271c56e3b9d5d33166154fdb6.html#a1f6b988271c56e3b9d5d33166154fdb6">dump</a> member function. The indentation of the output can be controlled with the member variable <code>width</code> of the output stream <em>o</em>. For instance, using the manipulator <code>std::setw(4)</code> on <em>o</em> sets the indentation level to <code>4</code> and the serialization result is the same as calling <code>dump(4)</code>.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in,out]</td><td class="paramname">o</td><td>stream to serialize to </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">j</td><td>JSON value to serialize</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>the stream <em>o</em> </dd></dl>
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<dl class="section user"><dt>Complexity</dt><dd>Linear.</dd></dl>
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<dl class="section user"><dt>Example</dt><dd>The example below shows the serialization with different parameters to <code>width</code> to adjust the indentation level. <div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#include <json.hpp></span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="keyword">using namespace </span><a class="code" href="namespacenlohmann.html">nlohmann</a>;</div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> </div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="keywordtype">int</span> main()</div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> {</div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>  <span class="comment">// create JSON values</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>  <a class="code" href="classnlohmann_1_1basic__json.html">json</a> j_object = {{<span class="stringliteral">"one"</span>, 1}, {<span class="stringliteral">"two"</span>, 2}};</div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>  <a class="code" href="classnlohmann_1_1basic__json.html">json</a> j_array = {1, 2, 4, 8, 16};</div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  <span class="comment">// serialize without indentation</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  std::cout << j_object << <span class="stringliteral">"\n\n"</span>;</div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  std::cout << j_array << <span class="stringliteral">"\n\n"</span>;</div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  <span class="comment">// serialize with indentation</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  std::cout << std::setw(4) << j_object << <span class="stringliteral">"\n\n"</span>;</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  std::cout << std::setw(2) << j_array << <span class="stringliteral">"\n\n"</span>;</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> }</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="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">{"one":1,"two":2}
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[1,2,4,8,16]
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{
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"one": 1,
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"two": 2
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}
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[
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1,
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2,
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4,
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8,
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16
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]
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</pre> The example code above can be translated with<pre class="fragment">g++ -std=c++11 -Isrc doc/examples/operator_serialize.cpp -o operator_serialize </pre>. </dd></dl>
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<li class="footer">Generated on Mon Jun 22 2015 23:21:59 for JSON for Modern C++ by
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