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25 <div class=
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26 <div class=
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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>
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>
34 <span class=
"special">}}
</span>
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.
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:
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>
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>
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56 <td align=
"right"><div class=
"copyright-footer">Copyright
© 2002-
2012 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
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