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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">
3<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
4<head>
5<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
6<meta name="generator" content="Docutils 0.5: http://docutils.sourceforge.net/" />
7<title>Forward Traversal Concept</title>
8<link rel="stylesheet" href="../../../rst.css" type="text/css" />
9</head>
10<body>
11<div class="document" id="forward-traversal-concept">
12<h1 class="title">Forward Traversal Concept</h1>
13
14<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
15<!-- Software License, Version 1.0. (See accompanying -->
16<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
17<p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Forward Traversal</em>
18concept if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> meeting the requirements of Default
19Constructible and Single Pass Iterator, the following expressions are
20valid and respect the stated semantics.</p>
21<table border="1" class="docutils">
22<colgroup>
23<col width="38%" />
24<col width="34%" />
25<col width="27%" />
26</colgroup>
27<thead valign="bottom">
28<tr><th class="head" colspan="3">Forward Traversal Iterator Requirements (in addition to Default Constructible and Single Pass Iterator)</th>
29</tr>
30<tr><th class="head">Expression</th>
31<th class="head">Return Type</th>
32<th class="head">Assertion/Note</th>
33</tr>
34</thead>
35<tbody valign="top">
36<tr><td><tt class="docutils literal"><span class="pre">X</span> <span class="pre">u;</span></tt></td>
37<td><tt class="docutils literal"><span class="pre">X&amp;</span></tt></td>
38<td>note: <tt class="docutils literal"><span class="pre">u</span></tt> may have a
39singular value.</td>
40</tr>
41<tr><td><tt class="docutils literal"><span class="pre">++r</span></tt></td>
42<td><tt class="docutils literal"><span class="pre">X&amp;</span></tt></td>
43<td><tt class="docutils literal"><span class="pre">r</span> <span class="pre">==</span> <span class="pre">s</span></tt> and <tt class="docutils literal"><span class="pre">r</span></tt> is
44dereferenceable implies
45<tt class="docutils literal"><span class="pre">++r</span> <span class="pre">==</span> <span class="pre">++s.</span></tt></td>
46</tr>
47<tr><td><tt class="docutils literal"><span class="pre">iterator_traits&lt;X&gt;::difference_type</span></tt></td>
48<td>A signed integral type representing
49the distance between iterators</td>
50<td>&nbsp;</td>
51</tr>
52<tr><td><tt class="docutils literal"><span class="pre">iterator_traversal&lt;X&gt;::type</span></tt></td>
53<td>Convertible to
54<tt class="docutils literal"><span class="pre">forward_traversal_tag</span></tt></td>
55<td>&nbsp;</td>
56</tr>
57</tbody>
58</table>
59</div>
60<div class="footer">
61<hr class="footer" />
62<a class="reference external" href="ForwardTraversal.rst">View document source</a>.
63Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
64
65</div>
66</body>
67</html>
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