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| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_typetraits.reference.promote"></a><a class="link" href="promote.html" title="promote"> promote</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">promote</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 integral or floating point promotion |
| can be applied to an rvalue of type <code class="computeroutput"><span class="identifier">T</span></code>, |
| then applies integral and floating point promotions 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. |
| See also <a class="link" href="integral_promotion.html" title="integral_promotion">integral_promotion</a> |
| and <a class="link" href="floating_point_promotion.html" title="floating_point_promotion">floating_point_promotion</a>. |
| </p> |
| <p> |
| <span class="bold"><strong>C++ Standard Reference:</strong></span> 4.5 except 4.5/3 |
| (integral bit-field) and 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">promote</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="id1090757"></a><p class="title"><b>Table 1.19. 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">promote</span><span class="special"><</span><span class="keyword">short</span> <span class="keyword">volatile</span><span class="special">>::</span><span class="identifier">type</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="keyword">int</span> <span class="keyword">volatile</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">promote</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">promote</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><span class="special">&</span></code> |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
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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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