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| <div class="section boost_multiprecision_tut_rational_rational_adaptor"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="boost_multiprecision.tut.rational.rational_adaptor"></a><a class="link" href="rational_adaptor.html" title="rational_adaptor">rational_adaptor</a> |
| </h4></div></div></div> |
| <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> |
| |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">IntBackend</span><span class="special">></span> |
| <span class="keyword">class</span> <span class="identifier">rational_adpater</span><span class="special">;</span> |
| |
| <span class="special">}}</span> |
| </pre> |
| <p> |
| The class template <code class="computeroutput"><span class="identifier">rational_adaptor</span></code> |
| is a back-end for <code class="computeroutput"><span class="identifier">number</span></code> |
| which converts any existing integer back-end into a rational-number back-end. |
| </p> |
| <p> |
| So for example, given an integer back-end type <code class="computeroutput"><span class="identifier">MyIntegerBackend</span></code>, |
| the use would be something like: |
| </p> |
| <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> |
| <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> |
| |
| <span class="identifier">MyRational</span> <span class="identifier">r</span> <span class="special">=</span> <span class="number">2</span><span class="special">;</span> |
| <span class="identifier">r</span> <span class="special">/=</span> <span class="number">3</span><span class="special">;</span> |
| <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> |
| <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> |
| </pre> |
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| <td align="right"><div class="copyright-footer">Copyright © 2002-2012 John Maddock and Christopher Kormanyos<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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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