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<title>Integer Types</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_multiprecision.tut.ints"></a><a class="link" href="ints.html" title="Integer Types">Integer Types</a>
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<dt><span class="section"><a href="ints/cpp_int.html">cpp_int</a></span></dt>
<dt><span class="section"><a href="ints/gmp_int.html">gmp_int</a></span></dt>
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<p>
The following back-ends provide integer arithmetic:
</p>
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<colgroup>
<col>
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<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Backend Type
</p>
</th>
<th>
<p>
Header
</p>
</th>
<th>
<p>
Radix
</p>
</th>
<th>
<p>
Dependencies
</p>
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<th>
<p>
Pros
</p>
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<th>
<p>
Cons
</p>
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<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">cpp_int</span></code>
</p>
</td>
<td>
<p>
boost/multiprecision/cpp_int.hpp
</p>
</td>
<td>
<p>
2
</p>
</td>
<td>
<p>
None
</p>
</td>
<td>
<p>
Very versatile, Boost licensed, all C++ integer type which support
both <a href="http://en.wikipedia.org/wiki/Arbitrary-precision_arithmetic" target="_top">arbitrary
precision</a> and fixed precision integer types.
</p>
</td>
<td>
<p>
Slower than <a href="http://gmplib.org" target="_top">GMP</a>, though
typically not as slow as <a href="http://libtom.org/?page=features&newsitems=5&whatfile=ltm" target="_top">libtommath</a>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">gmp_int</span></code>
</p>
</td>
<td>
<p>
boost/multiprecision/gmp.hpp
</p>
</td>
<td>
<p>
2
</p>
</td>
<td>
<p>
<a href="http://gmplib.org" target="_top">GMP</a>
</p>
</td>
<td>
<p>
Very fast and efficient back-end.
</p>
</td>
<td>
<p>
Dependency on GNU licensed <a href="http://gmplib.org" target="_top">GMP</a>
library.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">tom_int</span></code>
</p>
</td>
<td>
<p>
boost/multiprecision/tommath.hpp
</p>
</td>
<td>
<p>
2
</p>
</td>
<td>
<p>
<a href="http://libtom.org/?page=features&newsitems=5&whatfile=ltm" target="_top">libtommath</a>
</p>
</td>
<td>
<p>
Public domain back-end with no licence restrictions.
</p>
</td>
<td>
<p>
Slower than <a href="http://gmplib.org" target="_top">GMP</a>.
</p>
</td>
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<td align="right"><div class="copyright-footer">Copyright © 2002-2013 John Maddock and Christopher Kormanyos<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
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