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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">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</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>

<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span> <span class="keyword">using</span> <span class="identifier">floating_point_promotion_t</span> <span class="special">=</span> <span class="keyword">typename</span> <span class="identifier">floating_point_promotion</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">;</span> <span class="comment">// C++11 and above</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">&lt;</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">&gt;</span></code>
        or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</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">&gt;</span></code>
      </p>
<div class="table">
<a name="boost_typetraits.reference.floating_point_promotion.examples"></a><p class="title"><b>Table&#160;1.21.&#160;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">&lt;</span><span class="keyword">float</span>
                  <span class="keyword">const</span><span class="special">&gt;::</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">&lt;</span><span class="keyword">float</span><span class="special">&amp;&gt;::</span><span class="identifier">type</span></code>
                </p>
              </td>
<td>
                <p>
                  <code class="computeroutput"><span class="keyword">float</span><span class="special">&amp;</span></code>
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">floating_point_promotion</span><span class="special">&lt;</span><span class="keyword">short</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
                </p>
              </td>
<td>
                <p>
                  <code class="computeroutput"><span class="keyword">short</span></code>
                </p>
              </td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><p>
        <span class="bold"><strong>Compiler Compatibility:</strong></span> All current compilers
        are supported by this trait.
      </p>
</div>
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      Watanabe<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
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