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- <div class="titlepage"><div><div><h3 class="title">
- <a name="boost_multiprecision.ref.cpp_dec_ref"></a><a class="link" href="cpp_dec_ref.html" title="cpp_dec_float">cpp_dec_float</a>
- </h3></div></div></div>
- <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">multiprecision</span><span class="special">{</span>
- <span class="keyword">template</span> <span class="special"><</span><span class="keyword">unsigned</span> <span class="identifier">Digits10</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ExponentType</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">int32_t</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span> <span class="special">=</span> <span class="keyword">void</span><span class="special">></span>
- <span class="keyword">class</span> <span class="identifier">cpp_dec_float</span><span class="special">;</span>
- <span class="keyword">typedef</span> <span class="identifier">number</span><span class="special"><</span><span class="identifier">cpp_dec_float</span><span class="special"><</span><span class="number">50</span><span class="special">></span> <span class="special">></span> <span class="identifier">cpp_dec_float_50</span><span class="special">;</span>
- <span class="keyword">typedef</span> <span class="identifier">number</span><span class="special"><</span><span class="identifier">cpp_dec_float</span><span class="special"><</span><span class="number">100</span><span class="special">></span> <span class="special">></span> <span class="identifier">cpp_dec_float_100</span><span class="special">;</span>
- <span class="special">}}</span> <span class="comment">// namespaces</span>
- </pre>
- <p>
- Class template <code class="computeroutput"><span class="identifier">cpp_dec_float</span></code>
- fulfils all of the requirements for a <a class="link" href="backendconc.html" title="Backend Requirements">Backend</a>
- type. Its members and non-member functions are deliberately not documented:
- these are considered implementation details that are subject to change.
- </p>
- <p>
- The class takes three template parameters:
- </p>
- <div class="variablelist">
- <p class="title"><b></b></p>
- <dl class="variablelist">
- <dt><span class="term">Digits10</span></dt>
- <dd><p>
- The number of decimal digits precision the type should support. Note
- that this type does not normally perform any dynamic memory allocation,
- and as a result the <code class="computeroutput"><span class="identifier">Digits10</span></code>
- template argument should not be set too high or the class's size will
- grow unreasonably large.
- </p></dd>
- <dt><span class="term">ExponentType</span></dt>
- <dd><p>
- A signed integer type that represents the exponent of the number
- </p></dd>
- <dt><span class="term">Allocator</span></dt>
- <dd><p>
- The allocator used: defaults to type <code class="computeroutput"><span class="keyword">void</span></code>,
- meaning all storage is within the class, and no dynamic allocation
- is performed, but can be set to a standard library allocator if dynamic
- allocation makes more sense.
- </p></dd>
- </dl>
- </div>
- <p>
- The type of <code class="computeroutput"><span class="identifier">number_category</span><span class="special"><</span><span class="identifier">cpp_dec_float</span><span class="special"><</span><span class="identifier">Args</span><span class="special">...></span> <span class="special">>::</span><span class="identifier">type</span></code> is <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special"><</span><span class="identifier">number_kind_floating_point</span><span class="special">></span></code>.
- </p>
- <p>
- More information on this type can be found in the <a class="link" href="../tut/floats/cpp_dec_float.html" title="cpp_dec_float">tutorial</a>.
- </p>
- </div>
- <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
- <td align="left"></td>
- <td align="right"><div class="copyright-footer">Copyright © 2002-2019 John Maddock
- and Christopher Kormanyos<p>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- 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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