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<title>make_void</title>
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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">&lt;</span><span class="keyword">class</span><span class="special">...&gt;</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">&lt;</span><span class="keyword">class</span><span class="special">...</span> <span class="identifier">Ts</span><span class="special">&gt;</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">&lt;</span><span class="identifier">Ts</span><span class="special">...&gt;::</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">&lt;</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">&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.make_void.examples"></a><p class="title"><b>Table&#160;1.27.&#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">make_void</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;::</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">&lt;</span><span class="keyword">int</span><span class="special">&amp;&gt;::</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">&lt;</span><span class="keyword">int</span><span class="special">(*)(</span><span class="keyword">int</span><span class="special">)&gt;::</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">&lt;</span><span class="keyword">int</span><span class="special">[]&gt;::</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">&lt;</span><span class="keyword">int</span><span class="special">[</span><span class="number">1</span><span class="special">]&gt;::</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">&lt;&gt;::</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">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;::</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>
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<td align="right"><div class="copyright-footer">Copyright &#169; 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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