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<?xml version="1.0" encoding="utf-8" ?>
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="generator" content="Docutils 0.3.1: http://docutils.sourceforge.net/" />
<title>Single Pass Iterator Concept</title>
<link rel="stylesheet" href="default.css" type="text/css" />
</head>
<body>
<div class="document" id="single-pass-iterator-concept">
<h1 class="title">Single Pass Iterator Concept</h1>
<p>A class or built-in type <tt class="literal"><span class="pre">X</span></tt> models the <em>Single Pass Iterator</em>
concept if the following expressions are valid and respect the stated
semantics.</p>
<table border class="table">
<colgroup>
<col width="36%" />
<col width="33%" />
<col width="31%" />
</colgroup>
<thead valign="bottom">
<tr><th colspan="3">Single Pass Iterator Requirements (in addition to Incrementable Iterator and Equality
Comparable)</th>
</tr>
<tr><th>Expression</th>
<th>Return Type</th>
<th>Assertion/Semantics /
Pre-/Post-condition</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="literal"><span class="pre">++r</span></tt></td>
<td><tt class="literal"><span class="pre">X&amp;</span></tt></td>
<td>pre: <tt class="literal"><span class="pre">r</span></tt> is
dereferenceable; post:
<tt class="literal"><span class="pre">r</span></tt> is dereferenceable or
<tt class="literal"><span class="pre">r</span></tt> is past-the-end</td>
</tr>
<tr><td><tt class="literal"><span class="pre">a</span> <span class="pre">==</span> <span class="pre">b</span></tt></td>
<td>convertible to <tt class="literal"><span class="pre">bool</span></tt></td>
<td><tt class="literal"><span class="pre">==</span></tt> is an equivalence
relation over its domain</td>
</tr>
<tr><td><tt class="literal"><span class="pre">a</span> <span class="pre">!=</span> <span class="pre">b</span></tt></td>
<td>convertible to <tt class="literal"><span class="pre">bool</span></tt></td>
<td><tt class="literal"><span class="pre">!(a</span> <span class="pre">==</span> <span class="pre">b)</span></tt></td>
</tr>
<tr><td><tt class="literal"><span class="pre">iterator_traversal&lt;X&gt;::type</span></tt></td>
<td>Convertible to
<tt class="literal"><span class="pre">single_pass_traversal_tag</span></tt></td>
<td>&nbsp;</td>
</tr>
</tbody>
</table>
</div>
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