ceph/src/boost/libs/type_traits/doc/html/boost_typetraits/reference/make_signed.html

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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_typetraits.reference.make_signed"></a><a class="link" href="make_signed.html" title="make_signed">make_signed</a>
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  29 <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>
  30 <span class="keyword">struct</span> <span class="identifier">make_signed</span>
  31 <span class="special">{</span>
  32    <span class="keyword">typedef</span> <em class="replaceable"><code>see-below</code></em> <span class="identifier">type</span><span class="special">;</span>
  33 <span class="special">};</span>
  34 </pre>
  35 <p>
  36         <span class="bold"><strong>type:</strong></span> If T is a signed integer type then
  37         the same type as T, if T is an unsigned integer type then the corresponding
  38         signed type. Otherwise if T is an enumerated or character type (char or wchar_t)
  39         then a signed integer type with the same width as T.
  40       </p>
  41 <p>
  42         If T has any cv-qualifiers then these are also present on the result type.
  43       </p>
  44 <p>
  45         <span class="bold"><strong>Requires:</strong></span> T must be an integer or enumerated
  46         type, and must not be the type bool.
  47       </p>
  48 <p>
  49         <span class="bold"><strong>C++ Standard Reference:</strong></span> 3.9.1.
  50       </p>
  51 <p>
  52         <span class="bold"><strong>Compiler Compatibility:</strong></span> All current compilers
  53         are supported by this trait.
  54       </p>
  55 <p>
  56         <span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
  57         <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_signed</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
  58         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>
  59       </p>
  60 <div class="table">
  61 <a name="boost_typetraits.reference.make_signed.examples"></a><p class="title"><b>Table&#160;1.23.&#160;Examples</b></p>
  62 <div class="table-contents"><table class="table" summary="Examples">
  63 <colgroup>
  64 <col>
  65 <col>
  66 </colgroup>
  67 <thead><tr>
  68 <th>
  69                 <p>
  70                   Expression
  71                 </p>
  72               </th>
  73 <th>
  74                 <p>
  75                   Result Type
  76                 </p>
  77               </th>
  78 </tr></thead>
  79 <tbody>
  80 <tr>
  81 <td>
  82                 <p>
  83                   <code class="computeroutput"><span class="identifier">make_signed</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
  84                 </p>
  85               </td>
  86 <td>
  87                 <p>
  88                   <code class="computeroutput"><span class="keyword">int</span></code>
  89                 </p>
  90               </td>
  91 </tr>
  92 <tr>
  93 <td>
  94                 <p>
  95                   <code class="computeroutput"><span class="identifier">make_signed</span><span class="special">&lt;</span><span class="keyword">unsigned</span> <span class="keyword">int</span>
  96                   <span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
  97                 </p>
  98               </td>
  99 <td>
 100                 <p>
 101                   <code class="computeroutput"><span class="keyword">int</span> <span class="keyword">const</span></code>
 102                 </p>
 103               </td>
 104 </tr>
 105 <tr>
 106 <td>
 107                 <p>
 108                   <code class="computeroutput"><span class="identifier">make_signed</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">unsigned</span>
 109                   <span class="keyword">long</span> <span class="keyword">long</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
 110                 </p>
 111               </td>
 112 <td>
 113                 <p>
 114                   <code class="computeroutput"><span class="keyword">const</span> <span class="keyword">long</span>
 115                   <span class="keyword">long</span></code>
 116                 </p>
 117               </td>
 118 </tr>
 119 <tr>
 120 <td>
 121                 <p>
 122                   <code class="computeroutput"><span class="identifier">make_signed</span><span class="special">&lt;</span><span class="identifier">my_enum</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
 123                 </p>
 124               </td>
 125 <td>
 126                 <p>
 127                   A signed integer type with the same width as the enum.
 128                 </p>
 129               </td>
 130 </tr>
 131 <tr>
 132 <td>
 133                 <p>
 134                   <code class="computeroutput"><span class="identifier">make_signed</span><span class="special">&lt;</span><span class="keyword">wchar_t</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
 135                 </p>
 136               </td>
 137 <td>
 138                 <p>
 139                   A signed integer type with the same width as wchar_t.
 140                 </p>
 141               </td>
 142 </tr>
 143 </tbody>
 144 </table></div>
 145 </div>
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 150 <td align="right"><div class="copyright-footer">Copyright &#169; 2000, 2011 Adobe Systems Inc, David Abrahams,
 151       Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
 152       Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
 153       Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
 154       Watanabe<p>
 155         Distributed under the Boost Software License, Version 1.0. (See accompanying
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