ceph/src/boost/libs/mpl/doc/refmanual/empty-sequence.html

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  14 <div class="section" id="empty-sequence">
  15 <h1><a class="toc-backref" href="./views.html#id1417">empty_sequence</a></h1>
  16 <div class="section" id="id120">
  17 <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
  18 <pre class="literal-block">
  19 struct <a href="./empty-sequence.html" class="identifier">empty_sequence</a>
  20 {
  21     // <em>unspecified</em>
  22     // <em>...</em>
  23 };
  24 </pre>
  25 </div>
  26 <div class="section" id="id121">
  27 <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
  28 <p>Represents a sequence containing no elements.</p>
  29 </div>
  30 <div class="section" id="id122">
  31 <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
  32 <pre class="literal-block">
  33 #include &lt;<a href="../../../../boost/mpl/empty_sequence.hpp" class="header">boost/mpl/empty_sequence.hpp</a>&gt;
  34 </pre>
  35 </div>
  36 <div class="section" id="id123">
  37 <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
  38 <p>The semantics of an expression are defined only
  39 where they differ from, or are not defined in <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</p>
  40 <p>In the following table, <tt class="literal"><span class="pre">s</span></tt> is an instance of <tt class="literal"><span class="pre"><a href="./empty-sequence.html" class="identifier">empty_sequence</a></span></tt>.</p>
  41 <table border="1" class="docutils table">
  42 <colgroup>
  43 <col width="34%" />
  44 <col width="66%" />
  45 </colgroup>
  46 <thead valign="bottom">
  47 <tr><th class="head">Expression</th>
  48 <th class="head">Semantics</th>
  49 </tr>
  50 </thead>
  51 <tbody valign="top">
  52 <tr><td><tt class="literal"><span class="pre"><a href="./empty-sequence.html" class="identifier">empty_sequence</a></span></tt></td>
  53 <td>An empty <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</td>
  54 </tr>
  55 <tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::type</span></tt></td>
  56 <td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span> <span class="pre">==</span> <span class="pre">0</span></tt>; see <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</td>
  57 </tr>
  58 </tbody>
  59 </table>
  60 </div>
  61 <div class="section" id="id124">
  62 <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
  63 <pre class="literal-block">
  64 typedef <a href="./begin.html" class="identifier">begin</a>&lt;<a href="./empty-sequence.html" class="identifier">empty_sequence</a>&gt;::type first;
  65 typedef <a href="./end.html" class="identifier">end</a>&lt;<a href="./empty-sequence.html" class="identifier">empty_sequence</a>&gt;::type last;
  66
  67 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt;first,last&gt; ));
  68 <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a>&lt;<a href="./empty-sequence.html" class="identifier">empty_sequence</a>&gt;::value, ==, 0 );
  69
  70 typedef <a href="./transform-view.html" class="identifier">transform_view</a>&lt;
  71       <a href="./empty-sequence.html" class="identifier">empty_sequence</a>
  72     , add_pointer&lt;_&gt;
  73     &gt; empty_view;
  74
  75 <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a>&lt;<a href="./empty-sequence.html" class="identifier">empty_sequence</a>&gt;::value, ==, 0 );
  76 </pre>
  77 </div>
  78 <div class="section" id="id125">
  79 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
  80 <p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./views.html">Views</a>, <a class="reference internal" href="./vector.html">vector</a>, <a class="reference internal" href="./list.html">list</a>, <a class="reference internal" href="./single-view.html">single_view</a></p>
  81 <!-- Sequences/Views//filter_view -->
  82 </div>
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