ceph/src/boost/libs/mpl/doc/refmanual/single-view.html

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   7 <title>The MPL Reference Manual: single_view</title>
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  11 <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./joint-view.html" class="navigation-link">Prev</a>&nbsp;<a href="./transform-view.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./joint-view.html" class="navigation-link">Back</a>&nbsp;<a href="./transform-view.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./views.html" class="navigation-link">Up</a>&nbsp;<a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
  12 <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./views.html" class="navigation-link">Views</a> / <a href="./single-view.html" class="navigation-link">single_view</a></td>
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  14 <div class="section" id="single-view">
  15 <h1><a class="toc-backref" href="./views.html#id1421">single_view</a></h1>
  16 <div class="section" id="id151">
  17 <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
  18 <pre class="literal-block">
  19 template&lt;
  20       typename T
  21     &gt;
  22 struct <a href="./single-view.html" class="identifier">single_view</a>
  23 {
  24     // <em>unspecified</em>
  25     // <em>...</em>
  26 };
  27 </pre>
  28 </div>
  29 <div class="section" id="id152">
  30 <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
  31 <p>A view onto an arbitrary type <tt class="literal"><span class="pre">T</span></tt> as on a single-element sequence.</p>
  32 </div>
  33 <div class="section" id="id153">
  34 <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
  35 <pre class="literal-block">
  36 #include &lt;<a href="../../../../boost/mpl/single_view.hpp" class="header">boost/mpl/single_view.hpp</a>&gt;
  37 </pre>
  38 </div>
  39 <div class="section" id="id154">
  40 <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
  41 <ul class="simple">
  42 <li><a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a></li>
  43 </ul>
  44 </div>
  45 <div class="section" id="id155">
  46 <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
  47 <table border="1" class="docutils table">
  48 <colgroup>
  49 <col width="19%" />
  50 <col width="23%" />
  51 <col width="58%" />
  52 </colgroup>
  53 <thead valign="bottom">
  54 <tr><th class="head">Parameter</th>
  55 <th class="head">Requirement</th>
  56 <th class="head">Description</th>
  57 </tr>
  58 </thead>
  59 <tbody valign="top">
  60 <tr><td><tt class="literal"><span class="pre">T</span></tt></td>
  61 <td>Any type</td>
  62 <td>The type to be wrapped in a sequence.</td>
  63 </tr>
  64 </tbody>
  65 </table>
  66 </div>
  67 <div class="section" id="id156">
  68 <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
  69 <p>The semantics of an expression are defined only
  70 where they differ from, or are not defined in <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</p>
  71 <p>In the following table, <tt class="literal"><span class="pre">v</span></tt> is an instance of <tt class="literal"><span class="pre"><a href="./single-view.html" class="identifier">single_view</a></span></tt>, <tt class="literal"><span class="pre">x</span></tt> is an arbitrary type.</p>
  72 <table border="1" class="docutils table">
  73 <colgroup>
  74 <col width="34%" />
  75 <col width="66%" />
  76 </colgroup>
  77 <thead valign="bottom">
  78 <tr><th class="head">Expression</th>
  79 <th class="head">Semantics</th>
  80 </tr>
  81 </thead>
  82 <tbody valign="top">
  83 <tr><td><pre class="first last literal-block">
  84 <a href="./single-view.html" class="identifier">single_view</a>&lt;x&gt;
  85 <a href="./single-view.html" class="identifier">single_view</a>&lt;x&gt;::type
  86 </pre>
  87 </td>
  88 <td>A single-element <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a> <tt class="literal"><span class="pre">v</span></tt> such that
  89 <tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a>&lt;v&gt;::type</span></tt> is identical to <tt class="literal"><span class="pre">x</span></tt>.</td>
  90 </tr>
  91 <tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;v&gt;::type</span></tt></td>
  92 <td>The size of <tt class="literal"><span class="pre">v</span></tt>; <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;v&gt;::value</span> <span class="pre">==</span> <span class="pre">1</span></tt>;
  93 see <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</td>
  94 </tr>
  95 </tbody>
  96 </table>
  97 </div>
  98 <div class="section" id="id157">
  99 <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
 100 <pre class="literal-block">
 101 typedef <a href="./single-view.html" class="identifier">single_view</a>&lt;int&gt; view;
 102 typedef <a href="./begin.html" class="identifier">begin</a>&lt;view&gt;::type first;
 103 typedef <a href="./end.html" class="identifier">end</a>&lt;view&gt;::type last;
 104
 105 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; <a href="./deref.html" class="identifier">deref</a>&lt;first&gt;::type,int &gt; ));
 106 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; <a href="./next.html" class="identifier">next</a>&lt;first&gt;::type,last &gt; ));
 107 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; <a href="./prior.html" class="identifier">prior</a>&lt;last&gt;::type,first &gt; ));
 108
 109 <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a>&lt;view&gt;::value, ==, 1 );
 110 </pre>
 111 </div>
 112 <div class="section" id="id158">
 113 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
 114 <p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./views.html">Views</a>, <a class="reference internal" href="./iterator-range.html">iterator_range</a>, <a class="reference internal" href="./filter-view.html">filter_view</a>, <a class="reference internal" href="./transform-view.html">transform_view</a>, <a class="reference internal" href="./joint-view.html">joint_view</a>, <a class="reference internal" href="./zip-view.html">zip_view</a></p>
 115 <!-- Sequences/Views//transform_view -->
 116 </div>
 117 </div>
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