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>Lvalue Iterator Concept</title> 8<link rel="stylesheet" href="../../../rst.css" type="text/css" /> 9</head> 10<body> 11<div class="document" id="lvalue-iterator-concept"> 12<h1 class="title">Lvalue Iterator 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>The <em>Lvalue Iterator</em> concept adds the requirement that the return 18type of <tt class="docutils literal"><span class="pre">operator*</span></tt> type be a reference to the value type of the 19iterator.</p> 20<table border="1" class="docutils"> 21<colgroup> 22<col width="22%" /> 23<col width="19%" /> 24<col width="59%" /> 25</colgroup> 26<thead valign="bottom"> 27<tr><th class="head" colspan="3">Lvalue Iterator Requirements</th> 28</tr> 29<tr><th class="head">Expression</th> 30<th class="head">Return Type</th> 31<th class="head">Note/Assertion</th> 32</tr> 33</thead> 34<tbody valign="top"> 35<tr><td><tt class="docutils literal"><span class="pre">*a</span></tt></td> 36<td><tt class="docutils literal"><span class="pre">T&</span></tt></td> 37<td><tt class="docutils literal"><span class="pre">T</span></tt> is <em>cv</em> 38<tt class="docutils literal"><span class="pre">iterator_traits<X>::value_type</span></tt> 39where <em>cv</em> is an optional 40cv-qualification. 41pre: <tt class="docutils literal"><span class="pre">a</span></tt> is 42dereferenceable. If <tt class="docutils literal"><span class="pre">a</span> 43<span class="pre">==</span> <span class="pre">b</span></tt> then <tt class="docutils literal"><span class="pre">*a</span></tt> is 44equivalent to <tt class="docutils literal"><span class="pre">*b</span></tt>.</td> 45</tr> 46</tbody> 47</table> 48</div> 49<div class="footer"> 50<hr class="footer" /> 51<a class="reference external" href="LvalueIterator.rst">View document source</a>. 52Generated 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. 53 54</div> 55</body> 56</html> 57