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- <div class="titlepage"><div><div><h3 class="title">
- <a name="boost_typetraits.reference.make_void"></a><a class="link" href="make_void.html" title="make_void">make_void</a>
- </h3></div></div></div>
- <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span><span class="special">...></span>
- <span class="keyword">struct</span> <span class="identifier">make_void</span>
- <span class="special">{</span>
- <span class="keyword">typedef</span> <span class="keyword">void</span> <span class="identifier">type</span><span class="special">;</span>
- <span class="special">};</span>
- <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span><span class="special">...</span> <span class="identifier">Ts</span><span class="special">></span>
- <span class="keyword">using</span> <span class="identifier">void_t</span> <span class="special">=</span> <span class="keyword">typename</span> <span class="identifier">make_void</span><span class="special"><</span><span class="identifier">Ts</span><span class="special">...>::</span><span class="identifier">type</span><span class="special">;</span>
- </pre>
- <p>
- <span class="bold"><strong>type:</strong></span> The type <code class="computeroutput"><span class="keyword">void</span></code>
- for all <code class="computeroutput"><span class="identifier">T</span></code>.
- </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">make_void</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="boost_typetraits.reference.make_void.examples"></a><p class="title"><b>Table 1.27. 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">make_void</span><span class="special"><</span><span class="keyword">int</span><span class="special">>::</span><span class="identifier">type</span></code>
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="keyword">void</span></code>
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">make_void</span><span class="special"><</span><span class="keyword">int</span><span class="special">&>::</span><span class="identifier">type</span></code>
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="keyword">void</span></code>
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">make_void</span><span class="special"><</span><span class="keyword">int</span><span class="special">(*)(</span><span class="keyword">int</span><span class="special">)>::</span><span class="identifier">type</span></code>
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="keyword">void</span></code>
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">make_void</span><span class="special"><</span><span class="keyword">int</span><span class="special">[]>::</span><span class="identifier">type</span></code>
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="keyword">void</span></code>
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">make_void</span><span class="special"><</span><span class="keyword">int</span><span class="special">[</span><span class="number">1</span><span class="special">]>::</span><span class="identifier">type</span></code>
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="keyword">void</span></code>
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">make_void</span><span class="special"><>::</span><span class="identifier">type</span></code>
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="keyword">void</span></code>
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">make_void</span><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">>::</span><span class="identifier">type</span></code>
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="keyword">void</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. However, the type alias <code class="computeroutput"><span class="identifier">void_t</span></code>
- is only available if the compiler supports template aliases. Further, in
- the absence of variadic-template support, <code class="computeroutput"><span class="identifier">make_void</span></code>
- only supports up to 5 parameters.
- </p>
- </div>
- <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
- <td align="left"></td>
- <td align="right"><div class="copyright-footer">Copyright © 2000, 2011 Adobe Systems Inc, David Abrahams,
- Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
- Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
- Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and 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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