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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_typetraits.reference.floating_point_promotion"></a><a class="link" href="floating_point_promotion.html" title="floating_point_promotion">
floating_point_promotion</a>
</h3></div></div></div>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span>
<span class="keyword">struct</span> <span class="identifier">floating_point_promotion</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <em class="replaceable"><code>see-below</code></em> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<p>
<span class="bold"><strong>type:</strong></span> If floating point promotion can be
applied to an rvalue of type <code class="computeroutput"><span class="identifier">T</span></code>,
then applies floating point promotion to <code class="computeroutput"><span class="identifier">T</span></code>
and keeps cv-qualifiers of <code class="computeroutput"><span class="identifier">T</span></code>,
otherwise leaves <code class="computeroutput"><span class="identifier">T</span></code> unchanged.
</p>
<p>
<span class="bold"><strong>C++ Standard Reference:</strong></span> 4.6.
</p>
<p>
<span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
<span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">floating_point_promotion</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>
or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>
</p>
<div class="table">
<a name="id930080"></a><p class="title"><b>Table 1.11. Examples</b></p>
<div class="table-contents"><table class="table" summary="Examples">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Result Type
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">floating_point_promotion</span><span class="special"><</span><span class="keyword">float</span>
<span class="keyword">const</span><span class="special">>::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">double</span> <span class="keyword">const</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">floating_point_promotion</span><span class="special"><</span><span class="keyword">float</span><span class="special">&>::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">float</span><span class="special">&</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">floating_point_promotion</span><span class="special"><</span><span class="keyword">short</span><span class="special">>::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">short</span></code>
</p>
</td>
</tr>
</tbody>
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<td align="right"><div class="copyright-footer">Copyright © 2000, 2006 Adobe Systems Inc, David Abrahams,
Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant, Jesse Jones, Mat
Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten Ottosen, Robert
Ramey and Jeremy Siek<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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