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  27 <a name="boost_multiprecision.ref.mpf_ref"></a><a class="link" href="mpf_ref.html" title="gmp_float">gmp_float</a>
  28 </h3></div></div></div>
  29 <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>
  30
  31 <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">unsigned</span> <span class="identifier">Digits10</span><span class="special">&gt;</span>
  32 <span class="keyword">class</span> <span class="identifier">gmp_float</span><span class="special">;</span>
  33
  34 <span class="keyword">typedef</span> <span class="identifier">number</span><span class="special">&lt;</span><span class="identifier">gmp_float</span><span class="special">&lt;</span><span class="number">50</span><span class="special">&gt;</span> <span class="special">&gt;</span>    <span class="identifier">mpf_float_50</span><span class="special">;</span>
  35 <span class="keyword">typedef</span> <span class="identifier">number</span><span class="special">&lt;</span><span class="identifier">gmp_float</span><span class="special">&lt;</span><span class="number">100</span><span class="special">&gt;</span> <span class="special">&gt;</span>   <span class="identifier">mpf_float_100</span><span class="special">;</span>
  36 <span class="keyword">typedef</span> <span class="identifier">number</span><span class="special">&lt;</span><span class="identifier">gmp_float</span><span class="special">&lt;</span><span class="number">500</span><span class="special">&gt;</span> <span class="special">&gt;</span>   <span class="identifier">mpf_float_500</span><span class="special">;</span>
  37 <span class="keyword">typedef</span> <span class="identifier">number</span><span class="special">&lt;</span><span class="identifier">gmp_float</span><span class="special">&lt;</span><span class="number">1000</span><span class="special">&gt;</span> <span class="special">&gt;</span>  <span class="identifier">mpf_float_1000</span><span class="special">;</span>
  38 <span class="keyword">typedef</span> <span class="identifier">number</span><span class="special">&lt;</span><span class="identifier">gmp_float</span><span class="special">&lt;</span><span class="number">0</span><span class="special">&gt;</span> <span class="special">&gt;</span>     <span class="identifier">mpf_float</span><span class="special">;</span>
  39
  40 <span class="special">}}</span> <span class="comment">// namespaces</span>
  41 </pre>
  42 <p>
  43         Class template <code class="computeroutput"><span class="identifier">gmp_float</span></code>
  44         fulfils all of the requirements for a <a class="link" href="backendconc.html" title="Backend Requirements">Backend</a>
  45         type. Its members and non-member functions are deliberately not documented:
  46         these are considered implementation details that are subject to change.
  47       </p>
  48 <p>
  49         The class takes a single template parameter - <code class="computeroutput"><span class="identifier">Digits10</span></code>
  50         - which is the number of decimal digits precision the type should support.
  51         When this parameter is zero, then the precision can be set at runtime via
  52         <code class="computeroutput"><span class="identifier">number</span><span class="special">::</span><span class="identifier">default_precision</span></code> and <code class="computeroutput"><span class="identifier">number</span><span class="special">::</span><span class="identifier">precision</span></code>.
  53         Note that this type does not in any way change the GMP library's global state
  54         (for example it does not change the default precision of the mpf_t data type),
  55         therefore you can safely mix this type with existing code that uses GMP,
  56         and also mix <code class="computeroutput"><span class="identifier">gmp_float</span></code>s of
  57         differing precision.
  58       </p>
  59 <p>
  60         The type of <code class="computeroutput"><span class="identifier">number_category</span><span class="special">&lt;</span><span class="identifier">cpp_int</span><span class="special">&lt;</span><span class="identifier">Args</span><span class="special">...&gt;</span> <span class="special">&gt;::</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">&lt;</span><span class="identifier">number_kind_floating_point</span><span class="special">&gt;</span></code>.
  61       </p>
  62 <p>
  63         More information on this type can be found in the <a class="link" href="../tut/floats/gmp_float.html" title="gmp_float">tutorial</a>.
  64       </p>
  65 </div>
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  68 <td align="right"><div class="copyright-footer">Copyright &#169; 2002-2013 John Maddock and Christopher Kormanyos<p>
  69         Distributed under the Boost Software License, Version 1.0. (See accompanying
  70         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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