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<h1><span class="namespace" title="namespace std">std::</span><a href="/reference/random/exponential_distribution/">exponential_distribution</a>::param<span class="C_ico cpp11warning" title="This page describes a feature introduced by the latest revision of the C++ standard (2011). Older compilers may not support it." alt="This page describes a feature introduced by the latest revision of the C++ standard (2011). Older compilers may not support it."></span></h1>
<div class="C_prototype"><table><tr class="odd"><th>(1)</th><td><pre>param_type param() const;
</pre></td></tr><tr class="even"><th>(2)</th><td><pre>void param (const param_type&amp; parm);</pre></td></tr></table></div><div id="I_description">Distribution parameters</div>
<section id="description">
The first version <i>(1)</i> returns an object with the parameters currently associated with the distribution object.<br>
The second version <i>(2)</i> associates the parameters in object <i>parm</i> to the distribution object.<br>
<br>
An <a href="/exponential_distribution">exponential_distribution</a> is defined by a single parameter: <a href="/exponential_distribution::lambda">lambda</a> (&lambda;), which can be interpreted as the mean frequence of occurrences. An object of type <tt>param_type</tt> carries this information, but it is meant to be used only to construct or specify the parameters for a <a href="/exponential_distribution">exponential_distribution</a> object, not to inspect the individual parameters.<br>
<br>
To inspect the individual parameter associated to the distribution object you can use: <a href="/exponential_distribution::lambda">exponential_distribution::lambda</a>.<br>
</section>
<br>
<section id="parameters">
<h3>Parameters</h3>
<dl>
<dt>parm</dt>
<dd>An object representing the distribution's parameters, obtained by a call to member function <a href="/exponential_distribution::param">param</a>.<br>
<tt>param_type</tt> is a member type.</dd>
</dl>
</section>
<br>
<section id="return">
<h3>Return value</h3>
<dd>An object representing the distribution's parameters.<br>
<tt>param_type</tt> is a member type.<br>
</section>
<br>
<section id="example">
<h3>Example</h3>
<div class="auto"><table class="snippet"><tr><td class="rownum"><pre><code>1<br>2<br>3<br>4<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br></code></pre></td>
<td class="source"><pre><code><cite>// exponential_distribution::param</cite>
<dfn>#include &lt;iostream&gt;</dfn>
<dfn>#include &lt;random&gt;</dfn>

<var>int</var> main()
{
  std::default_random_engine generator;
  std::exponential_distribution&lt;<var>double</var>&gt; d1(0.8);
  std::exponential_distribution&lt;<var>double</var>&gt; d2(d1.param());

  <cite>// print two independent values:</cite>
  std::cout &lt;&lt; d1(generator) &lt;&lt; std::endl;
  std::cout &lt;&lt; d2(generator) &lt;&lt; std::endl;

  <var>return</var> 0;
}</code></pre></td><td class="C_btnholder"></td></tr></table></div>
<br>
<br>
Possible output:<br>
<div class="auto"><table class="snippet"><tr><td class="output"><pre><samp>2.53558
0.974334
</samp></pre></td></tr></table></div>
</section>
<br>
<section id="complexity">
<h3>Complexity</h3>
No worse than the complexity of <tt>param_type</tt>'s constructor.<br>
</section>
<br>
<section id="see">
<h3>See also</h3>
<dl class="links"><dt><a href= "/reference/random/exponential_distribution/exponential_distribution/"><b>exponential_distribution::(constructor)</b></a></dt><dd>Construct exponential distribution <span class="typ">(public member function)</span></dd></dl><dl class="links"><dt><a href= "/reference/random/exponential_distribution/reset/"><b>exponential_distribution::reset</b></a></dt><dd>Reset distribution <span class="typ">(public member function)</span></dd></dl>
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<li class="C_Collapsable"><h4>distributions:</h4><ul>
<li class="cpp11 folder"><a href="/reference/random/bernoulli_distribution/"><span>bernoulli_distribution</span></a></li>
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<li class="cpp11 folder"><a href="/reference/random/mersenne_twister_engine/"><span>mersenne_twister_engine</span></a></li>
<li class="cpp11"><a href="/reference/random/minstd_rand/"><span>minstd_rand</span></a></li>
<li class="cpp11"><a href="/reference/random/minstd_rand0/"><span>minstd_rand0</span></a></li>
<li class="cpp11"><a href="/reference/random/mt19937/"><span>mt19937</span></a></li>
<li class="cpp11"><a href="/reference/random/mt19937_64/"><span>mt19937_64</span></a></li>
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<li class="cpp11"><a href="/reference/random/ranlux24/"><span>ranlux24</span></a></li>
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<li class="cpp11"><a href="/reference/random/ranlux48/"><span>ranlux48</span></a></li>
<li class="cpp11"><a href="/reference/random/ranlux48_base/"><span>ranlux48_base</span></a></li>
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<li class="C_Collapsable"><h4>other:</h4><ul>
<li class="cpp11"><a href="/reference/random/generate_canonical/"><span>generate_canonical</span></a></li>
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<h3><b><a href="/reference/random/exponential_distribution/">exponential_distribution</a></b></h3>
<ul>
<li class="cpp11"><a href="/reference/random/exponential_distribution/exponential_distribution/"><span>exponential_distribution::(constructor)</span></a></li>
<li class="C_Collapsable"><h4>member functions:</h4><ul>
<li class="cpp11"><a href="/reference/random/exponential_distribution/lambda/"><span>exponential_distribution::lambda</span></a></li>
<li class="cpp11"><a href="/reference/random/exponential_distribution/max/"><span>exponential_distribution::max</span></a></li>
<li class="cpp11"><a href="/reference/random/exponential_distribution/min/"><span>exponential_distribution::min</span></a></li>
<li class="cpp11"><a href="/reference/random/exponential_distribution/operator()/"><span>exponential_distribution::operator()</span></a></li>
<li class="cpp11 selected"><a href="/reference/random/exponential_distribution/param/"><span>exponential_distribution::param</span></a></li>
<li class="cpp11"><a href="/reference/random/exponential_distribution/reset/"><span>exponential_distribution::reset</span></a></li>
</ul></li>
<li class="C_Collapsable"><h4>non-member functions:</h4><ul>
<li class="cpp11"><a href="/reference/random/exponential_distribution/operator<</"><span>operator&lt;&lt;</span></a></li>
<li class="cpp11"><a href="/reference/random/exponential_distribution/operator>>/"><span>operator&gt;&gt;</span></a></li>
<li class="cpp11"><a href="/reference/random/exponential_distribution/operators/"><span>relational operators</span></a></li>
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