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  27 <a name="boost_multiprecision.tut.ints"></a><a class="link" href="ints.html" title="Integer Types">Integer Types</a>
  28 </h3></div></div></div>
  29 <div class="toc"><dl class="toc">
  30 <dt><span class="section"><a href="ints/cpp_int.html">cpp_int</a></span></dt>
  31 <dt><span class="section"><a href="ints/gmp_int.html">gmp_int</a></span></dt>
  32 <dt><span class="section"><a href="ints/tom_int.html">tom_int</a></span></dt>
  33 <dt><span class="section"><a href="ints/egs.html">Examples</a></span></dt>
  34 <dd><dl>
  35 <dt><span class="section"><a href="ints/egs/factorials.html">Factorials</a></span></dt>
  36 <dt><span class="section"><a href="ints/egs/bitops.html">Bit Operations</a></span></dt>
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  39 <p>
  40         The following back-ends provide integer arithmetic:
  41       </p>
  42 <div class="informaltable"><table class="table">
  43 <colgroup>
  44 <col>
  45 <col>
  46 <col>
  47 <col>
  48 <col>
  49 <col>
  50 </colgroup>
  51 <thead><tr>
  52 <th>
  53                 <p>
  54                   Backend Type
  55                 </p>
  56               </th>
  57 <th>
  58                 <p>
  59                   Header
  60                 </p>
  61               </th>
  62 <th>
  63                 <p>
  64                   Radix
  65                 </p>
  66               </th>
  67 <th>
  68                 <p>
  69                   Dependencies
  70                 </p>
  71               </th>
  72 <th>
  73                 <p>
  74                   Pros
  75                 </p>
  76               </th>
  77 <th>
  78                 <p>
  79                   Cons
  80                 </p>
  81               </th>
  82 </tr></thead>
  83 <tbody>
  84 <tr>
  85 <td>
  86                 <p>
  87                   <code class="computeroutput"><span class="identifier">cpp_int</span></code>
  88                 </p>
  89               </td>
  90 <td>
  91                 <p>
  92                   boost/multiprecision/cpp_int.hpp
  93                 </p>
  94               </td>
  95 <td>
  96                 <p>
  97                   2
  98                 </p>
  99               </td>
 100 <td>
 101                 <p>
 102                   None
 103                 </p>
 104               </td>
 105 <td>
 106                 <p>
 107                   Very versatile, Boost licensed, all C++ integer type which support
 108                   both <a href="http://en.wikipedia.org/wiki/Arbitrary-precision_arithmetic" target="_top">arbitrary
 109                   precision</a> and fixed precision integer types.
 110                 </p>
 111               </td>
 112 <td>
 113                 <p>
 114                   Slower than <a href="http://gmplib.org" target="_top">GMP</a>, though
 115                   typically not as slow as <a href="http://libtom.org/?page=features&amp;newsitems=5&amp;whatfile=ltm" target="_top">libtommath</a>
 116                 </p>
 117               </td>
 118 </tr>
 119 <tr>
 120 <td>
 121                 <p>
 122                   <code class="computeroutput"><span class="identifier">gmp_int</span></code>
 123                 </p>
 124               </td>
 125 <td>
 126                 <p>
 127                   boost/multiprecision/gmp.hpp
 128                 </p>
 129               </td>
 130 <td>
 131                 <p>
 132                   2
 133                 </p>
 134               </td>
 135 <td>
 136                 <p>
 137                   <a href="http://gmplib.org" target="_top">GMP</a>
 138                 </p>
 139               </td>
 140 <td>
 141                 <p>
 142                   Very fast and efficient back-end.
 143                 </p>
 144               </td>
 145 <td>
 146                 <p>
 147                   Dependency on GNU licensed <a href="http://gmplib.org" target="_top">GMP</a>
 148                   library.
 149                 </p>
 150               </td>
 151 </tr>
 152 <tr>
 153 <td>
 154                 <p>
 155                   <code class="computeroutput"><span class="identifier">tom_int</span></code>
 156                 </p>
 157               </td>
 158 <td>
 159                 <p>
 160                   boost/multiprecision/tommath.hpp
 161                 </p>
 162               </td>
 163 <td>
 164                 <p>
 165                   2
 166                 </p>
 167               </td>
 168 <td>
 169                 <p>
 170                   <a href="http://libtom.org/?page=features&amp;newsitems=5&amp;whatfile=ltm" target="_top">libtommath</a>
 171                 </p>
 172               </td>
 173 <td>
 174                 <p>
 175                   Public domain back-end with no licence restrictions.
 176                 </p>
 177               </td>
 178 <td>
 179                 <p>
 180                   Slower than <a href="http://gmplib.org" target="_top">GMP</a>.
 181                 </p>
 182               </td>
 183 </tr>
 184 </tbody>
 185 </table></div>
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 190         Distributed under the Boost Software License, Version 1.0. (See accompanying
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