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| 24 | </div> | |
| 25 | <div class="section"> | |
| 26 | <div class="titlepage"><div><div><h4 class="title"> | |
| 27 | <a name="boost_multiprecision.tut.rational.rational_adaptor"></a><a class="link" href="rational_adaptor.html" title="rational_adaptor">rational_adaptor</a> | |
| 28 | </h4></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">class</span> <span class="identifier">IntBackend</span><span class="special">></span> | |
| 32 | <span class="keyword">class</span> <span class="identifier">rational_adpater</span><span class="special">;</span> | |
| 33 | ||
| 34 | <span class="special">}}</span> | |
| 35 | </pre> | |
| 36 | <p> | |
| 37 | The class template <code class="computeroutput"><span class="identifier">rational_adaptor</span></code> | |
| 38 | is a back-end for <code class="computeroutput"><span class="identifier">number</span></code> | |
| 39 | which converts any existing integer back-end into a rational-number back-end. | |
| 40 | </p> | |
| 41 | <p> | |
| 42 | So for example, given an integer back-end type <code class="computeroutput"><span class="identifier">MyIntegerBackend</span></code>, | |
| 43 | the use would be something like: | |
| 44 | </p> | |
| 45 | <pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">number</span><span class="special"><</span><span class="identifier">MyIntegerBackend</span><span class="special">></span> <span class="identifier">MyInt</span><span class="special">;</span> | |
| 46 | <span class="keyword">typedef</span> <span class="identifier">number</span><span class="special"><</span><span class="identifier">rational_adaptor</span><span class="special"><</span><span class="identifier">MyIntegerBackend</span><span class="special">></span> <span class="special">></span> <span class="identifier">MyRational</span><span class="special">;</span> | |
| 47 | ||
| 48 | <span class="identifier">MyRational</span> <span class="identifier">r</span> <span class="special">=</span> <span class="number">2</span><span class="special">;</span> | |
| 49 | <span class="identifier">r</span> <span class="special">/=</span> <span class="number">3</span><span class="special">;</span> | |
| 50 | <span class="identifier">MyInt</span> <span class="identifier">i</span> <span class="special">=</span> <span class="identifier">numerator</span><span class="special">(</span><span class="identifier">r</span><span class="special">);</span> | |
| 51 | <span class="identifier">assert</span><span class="special">(</span><span class="identifier">i</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span> | |
| 52 | </pre> | |
| 53 | </div> | |
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| 56 | <td align="right"><div class="copyright-footer">Copyright © 2002-2013 John Maddock and Christopher Kormanyos<p> | |
| 57 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 58 | 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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