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- <title>The MPL Reference Manual: Forward Sequence</title>
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- <div class="section" id="forward-sequence">
- <h1><a class="toc-backref" href="./concepts.html#id1395">Forward Sequence</a></h1>
- <div class="section" id="description">
- <h3>Description</h3>
- <p>A <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> is an MPL concept representing a compile-time sequence of
- elements. Sequence elements are
- types, and are accessible through <a class="reference internal" href="./iterators.html">Iterators</a>. The <a class="reference internal" href="./begin.html">begin</a> and <a class="reference internal" href="./end.html">end</a> metafunctions
- provide iterators delimiting the range of the sequence
- elements. A sequence guarantees that its elements are arranged in a definite,
- but possibly unspecified, order. Every MPL sequence is a <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</p>
- </div>
- <div class="section" id="definitions">
- <h3>Definitions</h3>
- <ul class="simple">
- <li>The <em>size</em> of a sequence is the number of elements it contains. The size is a
- nonnegative number.</li>
- <li>A sequence is <em>empty</em> if its size is zero.</li>
- </ul>
- </div>
- <div class="section" id="expression-requirements">
- <h3>Expression requirements</h3>
- <p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt> the following expressions must be valid:</p>
- <table border="1" class="docutils table">
- <colgroup>
- <col width="30%" />
- <col width="39%" />
- <col width="30%" />
- </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"><a href="./begin.html" class="identifier">begin</a><s>::type</span></tt></td>
- <td><a class="reference internal" href="./forward-iterator.html">Forward Iterator</a></td>
- <td>Amortized constant time</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt></td>
- <td><a class="reference internal" href="./forward-iterator.html">Forward Iterator</a></td>
- <td>Amortized constant time</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::type</span></tt></td>
- <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td>
- <td>Unspecified</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./empty.html" class="identifier">empty</a><s>::type</span></tt></td>
- <td>Boolean <a class="reference internal" href="./integral-constant.html">Integral Constant</a></td>
- <td>Constant time</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a><s>::type</span></tt></td>
- <td>Any type</td>
- <td>Amortized constant time</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="expression-semantics">
- <h3>Expression semantics</h3>
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- <colgroup>
- <col width="28%" />
- <col width="72%" />
- </colgroup>
- <thead valign="bottom">
- <tr><th class="head">Expression</th>
- <th class="head">Semantics</th>
- </tr>
- </thead>
- <tbody valign="top">
- <tr><td><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><s>::type</span></tt></td>
- <td>An iterator to the first element of the sequence; see <a class="reference internal" href="./begin.html">begin</a>.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt></td>
- <td>A past-the-end iterator to the sequence; see <a class="reference internal" href="./end.html">end</a>.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::type</span></tt></td>
- <td>The size of the sequence; see <a class="reference internal" href="./size.html">size</a>.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./empty.html" class="identifier">empty</a><s>::type</span></tt></td>
- <td>A boolean <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c</span></tt> such that
- <tt class="literal"><span class="pre">c::value</span> <span class="pre">==</span> <span class="pre">true</span></tt> if and only if the sequence is empty; see <a class="reference internal" href="./empty.html">empty</a>.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a><s>::type</span></tt></td>
- <td>The first element in the sequence; see <a class="reference internal" href="./front.html">front</a>.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="invariants">
- <h3>Invariants</h3>
- <p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt> the following invariants always hold:</p>
- <ul class="simple">
- <li>[<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><s>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt>) is always a valid range.</li>
- <li>An algorithm that iterates through the range [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><s>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt>)
- will pass through every element of <tt class="literal"><span class="pre">s</span></tt> exactly once.</li>
- <li><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><s>::type</span></tt> is identical to <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt> if and only if <tt class="literal"><span class="pre">s</span></tt> is empty.</li>
- <li>Two different iterations through <tt class="literal"><span class="pre">s</span></tt> will access its elements in the same order.</li>
- </ul>
- </div>
- <div class="section" id="models">
- <h3>Models</h3>
- <ul class="simple">
- <li><a class="reference internal" href="./vector.html">vector</a></li>
- <li><a class="reference internal" href="./map.html">map</a></li>
- <li><a class="reference internal" href="./range-c.html">range_c</a></li>
- <li><a class="reference internal" href="./iterator-range.html">iterator_range</a></li>
- <li><a class="reference internal" href="./filter-view.html">filter_view</a></li>
- </ul>
- </div>
- <div class="section" id="see-also">
- <h3>See also</h3>
- <p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a>, <a class="reference internal" href="./forward-iterator.html">Forward Iterator</a>, <a class="reference internal" href="./begin.html">begin</a> / <a class="reference internal" href="./end.html">end</a>, <a class="reference internal" href="./size.html">size</a>, <a class="reference internal" href="./empty.html">empty</a>, <a class="reference internal" href="./front.html">front</a></p>
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- <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
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