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new files for iterator concepts

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[SVN r22004]
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Jeremy Siek
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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<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>Readable Iterator Concept</title>
<link rel="stylesheet" href="default.css" type="text/css" />
</head>
<body>
<div class="document" id="readable-iterator-concept">
<h1 class="title">Readable Iterator Concept</h1>
<p>A class or built-in type <tt class="literal"><span class="pre">X</span></tt> models the <em>Readable Iterator</em> concept
for value type <tt class="literal"><span class="pre">T</span></tt> if, in addition to <tt class="literal"><span class="pre">X</span></tt> being Assignable and
Copy Constructible, the following expressions are valid and respect
the stated semantics. <tt class="literal"><span class="pre">U</span></tt> is the type of any specified member of
type <tt class="literal"><span class="pre">T</span></tt>.</p>
<table border class="table">
<colgroup>
<col width="28%" />
<col width="20%" />
<col width="52%" />
</colgroup>
<thead valign="bottom">
<tr><th colspan="3">Readable Iterator Requirements (in addition to Assignable and Copy Constructible)</th>
</tr>
<tr><th>Expression</th>
<th>Return Type</th>
<th>Note/Precondition</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="literal"><span class="pre">iterator_traits&lt;X&gt;::value_type</span></tt></td>
<td><tt class="literal"><span class="pre">T</span></tt></td>
<td>Any non-reference,
non-cv-qualified type</td>
</tr>
<tr><td><tt class="literal"><span class="pre">*a</span></tt></td>
<td>Convertible to <tt class="literal"><span class="pre">T</span></tt></td>
<td><dl class="first last">
<dt>pre: <tt class="literal"><span class="pre">a</span></tt> is dereferenceable. If <tt class="literal"><span class="pre">a</span> <span class="pre">==</span> <span class="pre">b</span></tt> then <tt class="literal"><span class="pre">*a</span></tt></dt>
<dd>is equivalent to <tt class="literal"><span class="pre">*b</span></tt>.</dd>
</dl>
</td>
</tr>
<tr><td><tt class="literal"><span class="pre">a-&gt;m</span></tt></td>
<td><tt class="literal"><span class="pre">U&amp;</span></tt></td>
<td>pre: <tt class="literal"><span class="pre">pre:</span> <span class="pre">(*a).m</span></tt> is well-defined. Equivalent to <tt class="literal"><span class="pre">(*a).m</span></tt>.</td>
</tr>
</tbody>
</table>
</div>
<hr class="footer" />
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