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107 lines
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<title>Namespaces</title>
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<table cellpadding="2" width="100%"><tr>
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<td align="center"><a href="../../../../../index.html">Home</a></td>
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="math_toolkit.namespaces"></a><a class="link" href="namespaces.html" title="Namespaces">Namespaces</a>
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</h2></div></div></div>
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<p>
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All math functions and distributions are in <code class="computeroutput"><span class="keyword">namespace</span>
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<span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span></code>.
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</p>
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<p>
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So, for example, the Students-t distribution template in <code class="computeroutput"><span class="keyword">namespace</span>
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<span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span></code> is
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</p>
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<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">RealType</span><span class="special">></span> <span class="keyword">class</span> <span class="identifier">students_t_distribution</span>
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</pre>
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<p>
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and can be instantiated with the help of the reserved name <code class="computeroutput"><span class="identifier">students_t</span></code>(for
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<code class="computeroutput"><span class="identifier">RealType</span> <span class="keyword">double</span></code>)
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</p>
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<pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">students_t_distribution</span><span class="special"><</span><span class="keyword">double</span><span class="special">></span> <span class="identifier">students_t</span><span class="special">;</span>
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<span class="identifier">student_t</span> <span class="identifier">mydist</span><span class="special">(</span><span class="number">10</span><span class="special">);</span>
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</pre>
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<div class="warning"><table border="0" summary="Warning">
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<tr>
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Warning]" src="../../../../../doc/src/images/warning.png"></td>
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<th align="left">Warning</th>
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</tr>
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<tr><td align="left" valign="top"><p>
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Some distribution names are also used in std random library, so to avoid
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the risk of ambiguity it is better to make explicit using declarations, for
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example: <code class="computeroutput"><span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">students_t_distribution</span></code>
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</p></td></tr>
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</table></div>
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<p>
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Functions not intended for use by applications are in <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">detail</span></code>.
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</p>
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<p>
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Functions that may have more general use, like <code class="computeroutput"><span class="identifier">digits</span></code>
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(significand), <code class="computeroutput"><span class="identifier">max_value</span></code>,
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<code class="computeroutput"><span class="identifier">min_value</span></code> and <code class="computeroutput"><span class="identifier">epsilon</span></code> are in <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">tools</span></code>.
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</p>
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<p>
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<a class="link" href="../policy.html" title="Chapter 20. Policies: Controlling Precision, Error Handling etc">Policy</a> and configuration information is in <code class="computeroutput"><span class="keyword">namespace</span></code> <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span></code>.
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</p>
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="../../../../../doc/src/images/tip.png"></td>
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<th align="left">Tip</th>
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</tr>
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<tr><td align="left" valign="top"><p>
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Many code snippets assume implicit namespace(s), for example, <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span></code> or
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<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span></code>.
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</p></td></tr>
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<th align="left">Tip</th>
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</tr>
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<tr><td align="left" valign="top"><p>
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Start your work from a copy of the example source code; links usually provided.
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</p></td></tr>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2006-2019 Nikhar
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Agrawal, Anton Bikineev, Paul A. Bristow, Marco Guazzone, Christopher Kormanyos,
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Hubert Holin, Bruno Lalande, John Maddock, Jeremy Murphy, Matthew Pulver, Johan
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Råde, Gautam Sewani, Benjamin Sobotta, Nicholas Thompson, Thijs van den Berg,
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Daryle Walker and Xiaogang Zhang<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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