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25 | <div class="section"> | |
26 | <div class="titlepage"><div><div><h3 class="title"> | |
27 | <a name="boost_multiprecision.ref.mpfr_ref"></a><a class="link" href="mpfr_ref.html" title="mpfr_float_backend">mpfr_float_backend</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"><</span><span class="keyword">unsigned</span> <span class="identifier">Digits10</span><span class="special">></span> | |
32 | <span class="keyword">class</span> <span class="identifier">mpfr_float_backend</span><span class="special">;</span> | |
33 | ||
34 | <span class="keyword">typedef</span> <span class="identifier">number</span><span class="special"><</span><span class="identifier">mpfr_float_backend</span><span class="special"><</span><span class="number">50</span><span class="special">></span> <span class="special">></span> <span class="identifier">mpfr_float_50</span><span class="special">;</span> | |
35 | <span class="keyword">typedef</span> <span class="identifier">number</span><span class="special"><</span><span class="identifier">mpfr_float_backend</span><span class="special"><</span><span class="number">100</span><span class="special">></span> <span class="special">></span> <span class="identifier">mpfr_float_100</span><span class="special">;</span> | |
36 | <span class="keyword">typedef</span> <span class="identifier">number</span><span class="special"><</span><span class="identifier">mpfr_float_backend</span><span class="special"><</span><span class="number">500</span><span class="special">></span> <span class="special">></span> <span class="identifier">mpfr_float_500</span><span class="special">;</span> | |
37 | <span class="keyword">typedef</span> <span class="identifier">number</span><span class="special"><</span><span class="identifier">mpfr_float_backend</span><span class="special"><</span><span class="number">1000</span><span class="special">></span> <span class="special">></span> <span class="identifier">mpfr_float_1000</span><span class="special">;</span> | |
38 | <span class="keyword">typedef</span> <span class="identifier">number</span><span class="special"><</span><span class="identifier">mpfr_float_backend</span><span class="special"><</span><span class="number">0</span><span class="special">></span> <span class="special">></span> <span class="identifier">mpfr_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">mpfr_float_backend</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 or MPFR library's | |
54 | global state (for example it does not change the default precision of the | |
55 | mpfr_t data type), therefore you can safely mix this type with existing code | |
56 | that uses GMP or MPFR, and also mix <code class="computeroutput"><span class="identifier">mpfr_float_backend</span></code>s | |
57 | of differing precision. | |
58 | </p> | |
59 | <p> | |
60 | The type of <code class="computeroutput"><span class="identifier">number_category</span><span class="special"><</span><span class="identifier">cpp_int</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>. | |
61 | </p> | |
62 | <p> | |
63 | More information on this type can be found in the <a class="link" href="../tut/floats/mpfr_float.html" title="mpfr_float">tutorial</a>. | |
64 | </p> | |
65 | </div> | |
66 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
67 | <td align="left"></td> | |
68 | <td align="right"><div class="copyright-footer">Copyright © 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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