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| 24 | </div> | |
| 25 | <div class="section"> | |
| 26 | <div class="titlepage"><div><div><h3 class="title"> | |
| 27 | <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> | |
| 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> <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> | |
| 32 | <span class="keyword">class</span> <span class="identifier">cpp_dec_float</span><span class="special">;</span> | |
| 33 | ||
| 34 | <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> | |
| 35 | <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> | |
| 36 | ||
| 37 | <span class="special">}}</span> <span class="comment">// namespaces</span> | |
| 38 | </pre> | |
| 39 | <p> | |
| 40 | Class template <code class="computeroutput"><span class="identifier">cpp_dec_float</span></code> | |
| 41 | fulfils all of the requirements for a <a class="link" href="backendconc.html" title="Backend Requirements">Backend</a> | |
| 42 | type. Its members and non-member functions are deliberately not documented: | |
| 43 | these are considered implementation details that are subject to change. | |
| 44 | </p> | |
| 45 | <p> | |
| 46 | The class takes three template parameters: | |
| 47 | </p> | |
| 48 | <div class="variablelist"> | |
| 49 | <p class="title"><b></b></p> | |
| 50 | <dl class="variablelist"> | |
| 51 | <dt><span class="term">Digits10</span></dt> | |
| 52 | <dd><p> | |
| 53 | The number of decimal digits precision the type should support. Note | |
| 54 | that this type does not normally perform any dynamic memory allocation, | |
| 55 | and as a result the <code class="computeroutput"><span class="identifier">Digits10</span></code> | |
| 56 | template argument should not be set too high or the class's size will | |
| 57 | grow unreasonably large. | |
| 58 | </p></dd> | |
| 59 | <dt><span class="term">ExponentType</span></dt> | |
| 60 | <dd><p> | |
| 61 | A signed integer type that represents the exponent of the number | |
| 62 | </p></dd> | |
| 63 | <dt><span class="term">Allocator</span></dt> | |
| 64 | <dd><p> | |
| 65 | The allocator used: defaults to type <code class="computeroutput"><span class="keyword">void</span></code>, | |
| 66 | meaning all storage is within the class, and no dynamic allocation | |
| 67 | is performed, but can be set to a standard library allocator if dynamic | |
| 68 | allocation makes more sense. | |
| 69 | </p></dd> | |
| 70 | </dl> | |
| 71 | </div> | |
| 72 | <p> | |
| 73 | 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>. | |
| 74 | </p> | |
| 75 | <p> | |
| 76 | 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>. | |
| 77 | </p> | |
| 78 | </div> | |
| 79 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
| 80 | <td align="left"></td> | |
| 81 | <td align="right"><div class="copyright-footer">Copyright © 2002-2013 John Maddock and Christopher Kormanyos<p> | |
| 82 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 83 | 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>) | |
| 84 | </p> | |
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