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- <title>The MPL Reference Manual: Variadic Sequence</title>
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- <div class="section" id="variadic-sequence">
- <h1><a class="toc-backref" href="./concepts.html#id1404">Variadic Sequence</a></h1>
- <div class="section" id="id45">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>A <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a> is a member of a family of sequence classes with both
- <em>variadic</em> and <em>numbered</em> forms. If <tt class="literal"><span class="pre">seq</span></tt> is a generic name for some
- <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a>, its <em>variadic form</em> allows us to specify a sequence of
- <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
- <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>,
- using the following notation:</p>
- <blockquote>
- <div class="line-block">
- <div class="line"><tt class="literal"><span class="pre">seq<</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">></span></tt></div>
- </div>
- </blockquote>
- <p>By contrast, each <em>numbered</em> sequence form accepts the exact number of elements
- that is encoded in the name of the corresponding class template:</p>
- <blockquote>
- <div class="line-block">
- <div class="line"><tt class="literal"><span class="pre">seq</span></tt><em>n</em><tt class="literal"><span class="pre"><</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">></span></tt></div>
- </div>
- </blockquote>
- <p>For numbered forms, there is no predefined top limit for <em>n</em>, aside from compiler
- limitations on the number of template parameters.</p>
- <!-- The variadic form of sequence ``seq`` is defined in
- ``<boost/mpl/``\ *seq*\ ``.hpp>`` header.
- The numbered forms are defined in batches of 10. -->
- </div>
- <div class="section" id="id47">
- <h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
- <p>In the following table and subsequent specifications, <tt class="literal"><span class="pre">seq</span></tt> is a placeholder token for the actual
- <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a> name.</p>
- <table border="1" class="docutils table">
- <colgroup>
- <col width="35%" />
- <col width="30%" />
- <col width="35%" />
- </colgroup>
- <thead valign="bottom">
- <tr><th class="head">Expression</th>
- <th class="head">Type</th>
- <th class="head">Complexity</th>
- </tr>
- </thead>
- <tbody valign="top">
- <tr><td><tt class="literal"><span class="pre">seq<</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">></span></tt></td>
- <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
- <td>Amortized constant time</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">seq<</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">>::type</span></tt></td>
- <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
- <td>Amortized constant time</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">seq</span></tt><em>n</em><tt class="literal"><span class="pre"><</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">></span></tt></td>
- <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
- <td>Amortized constant time</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">seq</span></tt><em>n</em><tt class="literal"><span class="pre"><</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">>::type</span></tt></td>
- <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
- <td>Amortized constant time</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id48">
- <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
- <pre class="literal-block">
- typedef seq<<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>> s;
- typedef seq<em>n</em><<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>> s;
- </pre>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
- <col class="field-body" />
- <tbody valign="top">
- <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>
- </tr>
- <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><s>::value</span> <span class="pre">==</span> <span class="pre">n</span></tt>.<!-- FIXME .. parsed-literal::
- BOOST_MPL_ASSERT((|is_same|\< at_c<v,0>::type,\ |t1| >));
- BOOST_MPL_ASSERT((|is_same|\< at_c<v,1>::type,\ |t2| >));
- ...
- BOOST_MPL_ASSERT((|is_same|\< at_c<v,\ *n*>::type,\ |tn| >)); -->
- </td>
- </tr>
- </tbody>
- </table>
- <!-- .......................................................................... -->
- <pre class="literal-block">
- typedef seq<<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>>::type s;
- typedef seq<em>n</em><<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>>::type s;
- </pre>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
- <col class="field-body" />
- <tbody valign="top">
- <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"><</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">></span></tt>.</td>
- </tr>
- <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><s>::value</span> <span class="pre">==</span> <span class="pre">n</span></tt>.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id49">
- <h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
- <ul class="simple">
- <li><a class="reference internal" href="./vector.html">vector</a></li>
- <li><a class="reference internal" href="./list.html">list</a></li>
- <li><a class="reference internal" href="./map.html">map</a></li>
- </ul>
- </div>
- <div class="section" id="id50">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <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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