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- <div class="titlepage"><div><div><h3 class="title">
- <a name="boost_typetraits.reference.make_signed"></a><a class="link" href="make_signed.html" title="make_signed">make_signed</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">make_signed</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"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> <span class="keyword">using</span> <span class="identifier">make_signed_t</span> <span class="special">=</span> <span class="keyword">typename</span> <span class="identifier">make_signed</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</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 T is a signed integer type then
- the same type as T, if T is an unsigned integer type then the corresponding
- signed type. Otherwise if T is an enumerated or character type (char or wchar_t)
- then a signed integer type with the same width as T.
- </p>
- <p>
- If T has any cv-qualifiers then these are also present on the result type.
- </p>
- <p>
- <span class="bold"><strong>Requires:</strong></span> T must be an integer or enumerated
- type, and must not be the type bool.
- </p>
- <p>
- <span class="bold"><strong>C++ Standard Reference:</strong></span> 3.9.1.
- </p>
- <p>
- <span class="bold"><strong>Compiler Compatibility:</strong></span> All current compilers
- are supported by this trait.
- </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_signed</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_signed.examples"></a><p class="title"><b>Table 1.25. 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_signed</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">int</span></code>
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">make_signed</span><span class="special"><</span><span class="keyword">unsigned</span> <span class="keyword">int</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">int</span> <span class="keyword">const</span></code>
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">make_signed</span><span class="special"><</span><span class="keyword">const</span> <span class="keyword">unsigned</span>
- <span class="keyword">long</span> <span class="keyword">long</span><span class="special">>::</span><span class="identifier">type</span></code>
- </p>
- </td>
- <td>
- <p>
- <code class="computeroutput"><span class="keyword">const</span> <span class="keyword">long</span>
- <span class="keyword">long</span></code>
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">make_signed</span><span class="special"><</span><span class="identifier">my_enum</span><span class="special">>::</span><span class="identifier">type</span></code>
- </p>
- </td>
- <td>
- <p>
- A signed integer type with the same width as the enum.
- </p>
- </td>
- </tr>
- <tr>
- <td>
- <p>
- <code class="computeroutput"><span class="identifier">make_signed</span><span class="special"><</span><span class="keyword">wchar_t</span><span class="special">>::</span><span class="identifier">type</span></code>
- </p>
- </td>
- <td>
- <p>
- A signed integer type with the same width as wchar_t.
- </p>
- </td>
- </tr>
- </tbody>
- </table></div>
- </div>
- <br class="table-break">
- </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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