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| <a name="boost.units.static_rational"></a><div class="titlepage"></div> |
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| <h2><span class="refentrytitle">Class template static_rational</span></h2> |
| <p>boost::units::static_rational</p> |
| </div> |
| <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> |
| <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../boost_units/Reference.html#header.boost.units.static_rational_hpp" title="Header <boost/units/static_rational.hpp>">boost/units/static_rational.hpp</a>> |
| |
| </span><span class="keyword">template</span><span class="special"><</span><span class="identifier">integer_type</span> N<span class="special">,</span> <span class="identifier">integer_type</span> D <span class="special">=</span> <span class="number">1</span><span class="special">></span> |
| <span class="keyword">class</span> <a class="link" href="static_rational.html" title="Class template static_rational">static_rational</a> <span class="special">{</span> |
| <span class="keyword">public</span><span class="special">:</span> |
| <span class="comment">// types</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="boost.units.static_rational.tag"></a><span class="identifier">tag</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <a class="link" href="static_rational.html" title="Class template static_rational">static_rational</a><span class="special"><</span> <span class="identifier">Numerator</span><span class="special">,</span> <span class="identifier">Denominator</span> <span class="special">></span> <a name="boost.units.static_rational.type"></a><span class="identifier">type</span><span class="special">;</span> <span class="comment">// static_rational<N,D> reduced by GCD </span> |
| |
| <span class="comment">// <a class="link" href="static_rational.html#boost.units.static_rationalconstruct-copy-destruct">construct/copy/destruct</a></span> |
| <a class="link" href="static_rational.html#id1455310-bb"><span class="identifier">static_rational</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> |
| |
| <span class="comment">// <a class="link" href="static_rational.html#id1455287-bb">public static functions</a></span> |
| <span class="keyword">static</span> <span class="identifier">integer_type</span> <a class="link" href="static_rational.html#id1455290-bb"><span class="identifier">numerator</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="identifier">integer_type</span> <a class="link" href="static_rational.html#id1455298-bb"><span class="identifier">denominator</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">integer_type</span> Numerator<span class="special">;</span> |
| <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">integer_type</span> Denominator<span class="special">;</span> |
| <span class="special">}</span><span class="special">;</span></pre></div> |
| <div class="refsect1"> |
| <a name="id2895490"></a><h2>Description</h2> |
| <p>This is an implementation of a compile time rational number, where <code class="computeroutput">static_rational<N,D></code> represents a rational number with numerator <code class="computeroutput">N</code> and denominator <code class="computeroutput">D</code>. Because of the potential for ambiguity arising from multiple equivalent values of <code class="computeroutput">static_rational</code> (e.g. <code class="computeroutput">static_rational<6,2>==static_rational<3></code>), static rationals should always be accessed through <code class="computeroutput">static_rational<N,D>::type</code>. Template specialization prevents instantiation of zero denominators (i.e. <code class="computeroutput">static_rational<N,0></code>). The following compile-time arithmetic operators are provided for static_rational variables only (no operators are defined between long and static_rational):</p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"><p><code class="computeroutput">mpl::negate</code> </p></li> |
| <li class="listitem"><p><code class="computeroutput">mpl::plus</code> </p></li> |
| <li class="listitem"><p><code class="computeroutput">mpl::minus</code> </p></li> |
| <li class="listitem"><p><code class="computeroutput">mpl::times</code> </p></li> |
| <li class="listitem"><p><code class="computeroutput">mpl::divides</code> </p></li> |
| </ul></div> |
| <p> |
| </p> |
| <p>Neither <code class="computeroutput">static_power</code> nor <code class="computeroutput">static_root</code> are defined for <code class="computeroutput">static_rational</code>. This is because template types may not be floating point values, while powers and roots of rational numbers can produce floating point values. </p> |
| <div class="refsect2"> |
| <a name="id2895612"></a><h3> |
| <a name="boost.units.static_rationalconstruct-copy-destruct"></a><code class="computeroutput">static_rational</code> |
| public |
| construct/copy/destruct</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><pre class="literallayout"><a name="id1455310-bb"></a><span class="identifier">static_rational</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li></ol></div> |
| </div> |
| <div class="refsect2"> |
| <a name="id2895661"></a><h3> |
| <a name="id1455287-bb"></a><code class="computeroutput">static_rational</code> public static functions</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"> |
| <li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="identifier">integer_type</span> <a name="id1455290-bb"></a><span class="identifier">numerator</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li> |
| <li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="identifier">integer_type</span> <a name="id1455298-bb"></a><span class="identifier">denominator</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li> |
| </ol></div> |
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| <td align="right"><div class="copyright-footer">Copyright © 2003 -2008 Matthias Christian Schabel, 2007-2010 Steven |
| Watanabe<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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