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

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  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="./concepts.html" class="navigation-link">Concepts</a> / <a href="./variadic-sequence.html" class="navigation-link">Variadic Sequence</a></td>
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  14 <div class="section" id="variadic-sequence">
  15 <h1><a class="toc-backref" href="./concepts.html#id1404">Variadic Sequence</a></h1>
  16 <div class="section" id="id45">
  17 <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
  18 <p>A <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a> is a member of a family of sequence classes with both
  19 <em>variadic</em> and <em>numbered</em> forms. If <tt class="literal"><span class="pre">seq</span></tt> is a generic name for some
  20 <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a>, its <em>variadic form</em> allows us to specify a sequence of
  21 <em>n</em> elements <em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>, for any <em>n</em> from 0 up to a
  22 <a class="reference internal" href="./configuration.html">preprocessor-configurable limit</a> <tt class="literal"><span class="pre">BOOST_MPL_LIMIT_</span></tt><em>seq</em><tt class="literal"><span class="pre">_SIZE</span></tt>,
  23 using the following notation:</p>
  24 <blockquote>
  25 <div class="line-block">
  26 <div class="line"><tt class="literal"><span class="pre">seq&lt;</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub><tt class="literal"><span class="pre">&gt;</span></tt></div>
  27 </div>
  28 </blockquote>
  29 <p>By contrast, each <em>numbered</em> sequence form accepts the exact number of elements
  30 that is encoded in the name of the corresponding class template:</p>
  31 <blockquote>
  32 <div class="line-block">
  33 <div class="line"><tt class="literal"><span class="pre">seq</span></tt><em>n</em><tt class="literal"><span class="pre">&lt;</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub><tt class="literal"><span class="pre">&gt;</span></tt></div>
  34 </div>
  35 </blockquote>
  36 <p>For numbered forms, there is no predefined top limit for <em>n</em>, aside from compiler
  37 limitations on the number of template parameters.</p>
  38 <!-- The variadic form of sequence ``seq`` is defined in
  39 ``<boost/mpl/``\ *seq*\ ``.hpp>`` header.
  40 The numbered forms are defined in batches of 10. -->
  41 </div>
  42 <div class="section" id="id47">
  43 <h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
  44 <p>In the following table and subsequent specifications, <tt class="literal"><span class="pre">seq</span></tt> is a placeholder token for the actual
  45 <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a> name.</p>
  46 <table border="1" class="docutils table">
  47 <colgroup>
  48 <col width="35%" />
  49 <col width="30%" />
  50 <col width="35%" />
  51 </colgroup>
  52 <thead valign="bottom">
  53 <tr><th class="head">Expression</th>
  54 <th class="head">Type</th>
  55 <th class="head">Complexity</th>
  56 </tr>
  57 </thead>
  58 <tbody valign="top">
  59 <tr><td><tt class="literal"><span class="pre">seq&lt;</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub><tt class="literal"><span class="pre">&gt;</span></tt></td>
  60 <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
  61 <td>Amortized constant time</td>
  62 </tr>
  63 <tr><td><tt class="literal"><span class="pre">seq&lt;</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub><tt class="literal"><span class="pre">&gt;::type</span></tt></td>
  64 <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
  65 <td>Amortized constant time</td>
  66 </tr>
  67 <tr><td><tt class="literal"><span class="pre">seq</span></tt><em>n</em><tt class="literal"><span class="pre">&lt;</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub><tt class="literal"><span class="pre">&gt;</span></tt></td>
  68 <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
  69 <td>Amortized constant time</td>
  70 </tr>
  71 <tr><td><tt class="literal"><span class="pre">seq</span></tt><em>n</em><tt class="literal"><span class="pre">&lt;</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub><tt class="literal"><span class="pre">&gt;::type</span></tt></td>
  72 <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
  73 <td>Amortized constant time</td>
  74 </tr>
  75 </tbody>
  76 </table>
  77 </div>
  78 <div class="section" id="id48">
  79 <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
  80 <pre class="literal-block">
  81 typedef seq&lt;<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>&gt; s;
  82 typedef seq<em>n</em>&lt;<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>&gt; s;
  83 </pre>
  84 <table class="docutils field-list" frame="void" rules="none">
  85 <col class="field-name" />
  86 <col class="field-body" />
  87 <tbody valign="top">
  88 <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><tt class="literal"><span class="pre">s</span></tt> is a sequence of elements <em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>.</td>
  89 </tr>
  90 <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><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">n</span></tt>.<!-- FIXME .. parsed-literal::
  91
  92 BOOST_MPL_ASSERT((|is_same|\< at_c<v,0>::type,\ |t1| >));
  93 BOOST_MPL_ASSERT((|is_same|\< at_c<v,1>::type,\ |t2| >));
  94 ...
  95 BOOST_MPL_ASSERT((|is_same|\< at_c<v,\ *n*>::type,\ |tn| >)); -->
  96 </td>
  97 </tr>
  98 </tbody>
  99 </table>
 100 <!-- .......................................................................... -->
 101 <pre class="literal-block">
 102 typedef seq&lt;<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>&gt;::type s;
 103 typedef seq<em>n</em>&lt;<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>&gt;::type s;
 104 </pre>
 105 <table class="docutils field-list" frame="void" rules="none">
 106 <col class="field-name" />
 107 <col class="field-body" />
 108 <tbody valign="top">
 109 <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><tt class="literal"><span class="pre">s</span></tt> is identical to <tt class="literal"><span class="pre">seq</span></tt><em>n</em><tt class="literal"><span class="pre">&lt;</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub> <tt class="literal"><span class="pre">&gt;</span></tt>.</td>
 110 </tr>
 111 <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><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">n</span></tt>.</td>
 112 </tr>
 113 </tbody>
 114 </table>
 115 </div>
 116 <div class="section" id="id49">
 117 <h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
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 119 <li><a class="reference internal" href="./vector.html">vector</a></li>
 120 <li><a class="reference internal" href="./list.html">list</a></li>
 121 <li><a class="reference internal" href="./map.html">map</a></li>
 122 </ul>
 123 </div>
 124 <div class="section" id="id50">
 125 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
 126 <p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./configuration.html">Configuration</a>, <a class="reference internal" href="./integral-sequence-wrapper.html">Integral Sequence Wrapper</a></p>
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