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1 | <?xml version="1.0" encoding="utf-8" ?> |
| 2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> | |
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| 4 | <head> | |
| 5 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> | |
| 6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
| 7 | <title>The MPL Reference Manual: Forward Sequence</title> | |
| 8 | <link rel="stylesheet" href="../style.css" type="text/css" /> | |
| 9 | </head> | |
| 10 | <body class="docframe refmanual"> | |
| 11 | <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./concepts.html" class="navigation-link">Prev</a> <a href="./bidirectional-sequence.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./bidirectional-sequence.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./concepts.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </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="./concepts.html" class="navigation-link">Concepts</a> / <a href="./forward-sequence.html" class="navigation-link">Forward Sequence</a></td> | |
| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="forward-sequence"> | |
| 15 | <h1><a class="toc-backref" href="./concepts.html#id1395">Forward Sequence</a></h1> | |
| 16 | <div class="section" id="description"> | |
| 17 | <h3>Description</h3> | |
| 18 | <p>A <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> is an MPL concept representing a compile-time sequence of | |
| 19 | elements. Sequence elements are | |
| 20 | 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 | |
| 21 | provide iterators delimiting the range of the sequence | |
| 22 | elements. A sequence guarantees that its elements are arranged in a definite, | |
| 23 | but possibly unspecified, order. Every MPL sequence is a <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</p> | |
| 24 | </div> | |
| 25 | <div class="section" id="definitions"> | |
| 26 | <h3>Definitions</h3> | |
| 27 | <ul class="simple"> | |
| 28 | <li>The <em>size</em> of a sequence is the number of elements it contains. The size is a | |
| 29 | nonnegative number.</li> | |
| 30 | <li>A sequence is <em>empty</em> if its size is zero.</li> | |
| 31 | </ul> | |
| 32 | </div> | |
| 33 | <div class="section" id="expression-requirements"> | |
| 34 | <h3>Expression requirements</h3> | |
| 35 | <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> | |
| 36 | <table border="1" class="docutils table"> | |
| 37 | <colgroup> | |
| 38 | <col width="30%" /> | |
| 39 | <col width="39%" /> | |
| 40 | <col width="30%" /> | |
| 41 | </colgroup> | |
| 42 | <thead valign="bottom"> | |
| 43 | <tr><th class="head">Expression</th> | |
| 44 | <th class="head">Type</th> | |
| 45 | <th class="head">Complexity</th> | |
| 46 | </tr> | |
| 47 | </thead> | |
| 48 | <tbody valign="top"> | |
| 49 | <tr><td><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><s>::type</span></tt></td> | |
| 50 | <td><a class="reference internal" href="./forward-iterator.html">Forward Iterator</a></td> | |
| 51 | <td>Amortized constant time</td> | |
| 52 | </tr> | |
| 53 | <tr><td><tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt></td> | |
| 54 | <td><a class="reference internal" href="./forward-iterator.html">Forward Iterator</a></td> | |
| 55 | <td>Amortized constant time</td> | |
| 56 | </tr> | |
| 57 | <tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::type</span></tt></td> | |
| 58 | <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td> | |
| 59 | <td>Unspecified</td> | |
| 60 | </tr> | |
| 61 | <tr><td><tt class="literal"><span class="pre"><a href="./empty.html" class="identifier">empty</a><s>::type</span></tt></td> | |
| 62 | <td>Boolean <a class="reference internal" href="./integral-constant.html">Integral Constant</a></td> | |
| 63 | <td>Constant time</td> | |
| 64 | </tr> | |
| 65 | <tr><td><tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a><s>::type</span></tt></td> | |
| 66 | <td>Any type</td> | |
| 67 | <td>Amortized constant time</td> | |
| 68 | </tr> | |
| 69 | </tbody> | |
| 70 | </table> | |
| 71 | </div> | |
| 72 | <div class="section" id="expression-semantics"> | |
| 73 | <h3>Expression semantics</h3> | |
| 74 | <table border="1" class="docutils table"> | |
| 75 | <colgroup> | |
| 76 | <col width="28%" /> | |
| 77 | <col width="72%" /> | |
| 78 | </colgroup> | |
| 79 | <thead valign="bottom"> | |
| 80 | <tr><th class="head">Expression</th> | |
| 81 | <th class="head">Semantics</th> | |
| 82 | </tr> | |
| 83 | </thead> | |
| 84 | <tbody valign="top"> | |
| 85 | <tr><td><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><s>::type</span></tt></td> | |
| 86 | <td>An iterator to the first element of the sequence; see <a class="reference internal" href="./begin.html">begin</a>.</td> | |
| 87 | </tr> | |
| 88 | <tr><td><tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt></td> | |
| 89 | <td>A past-the-end iterator to the sequence; see <a class="reference internal" href="./end.html">end</a>.</td> | |
| 90 | </tr> | |
| 91 | <tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::type</span></tt></td> | |
| 92 | <td>The size of the sequence; see <a class="reference internal" href="./size.html">size</a>.</td> | |
| 93 | </tr> | |
| 94 | <tr><td><tt class="literal"><span class="pre"><a href="./empty.html" class="identifier">empty</a><s>::type</span></tt></td> | |
| 95 | <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 | |
| 96 | <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> | |
| 97 | </tr> | |
| 98 | <tr><td><tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a><s>::type</span></tt></td> | |
| 99 | <td>The first element in the sequence; see <a class="reference internal" href="./front.html">front</a>.</td> | |
| 100 | </tr> | |
| 101 | </tbody> | |
| 102 | </table> | |
| 103 | </div> | |
| 104 | <div class="section" id="invariants"> | |
| 105 | <h3>Invariants</h3> | |
| 106 | <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> | |
| 107 | <ul class="simple"> | |
| 108 | <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> | |
| 109 | <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>) | |
| 110 | will pass through every element of <tt class="literal"><span class="pre">s</span></tt> exactly once.</li> | |
| 111 | <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> | |
| 112 | <li>Two different iterations through <tt class="literal"><span class="pre">s</span></tt> will access its elements in the same order.</li> | |
| 113 | </ul> | |
| 114 | </div> | |
| 115 | <div class="section" id="models"> | |
| 116 | <h3>Models</h3> | |
| 117 | <ul class="simple"> | |
| 118 | <li><a class="reference internal" href="./vector.html">vector</a></li> | |
| 119 | <li><a class="reference internal" href="./map.html">map</a></li> | |
| 120 | <li><a class="reference internal" href="./range-c.html">range_c</a></li> | |
| 121 | <li><a class="reference internal" href="./iterator-range.html">iterator_range</a></li> | |
| 122 | <li><a class="reference internal" href="./filter-view.html">filter_view</a></li> | |
| 123 | </ul> | |
| 124 | </div> | |
| 125 | <div class="section" id="see-also"> | |
| 126 | <h3>See also</h3> | |
| 127 | <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> | |
| 128 | <!-- Sequences/Concepts//Bidirectional Sequence |20 --> | |
| 129 | </div> | |
| 130 | </div> | |
| 131 | ||
| 132 | <div class="footer-separator"></div> | |
| 133 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./concepts.html" class="navigation-link">Prev</a> <a href="./bidirectional-sequence.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./bidirectional-sequence.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./concepts.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> | |
| 134 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
| 135 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 136 | file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body> | |
| 137 | </html> |