<?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 0.5: http://docutils.sourceforge.net/" /> <title>Readable Iterator Concept</title> <link rel="stylesheet" href="../../../rst.css" type="text/css" /> </head> <body> <div class="document" id="readable-iterator-concept"> <h1 class="title">Readable Iterator Concept</h1> <!-- Copyright David Abrahams 2006. Distributed under the Boost --> <!-- Software License, Version 1.0. (See accompanying --> <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) --> <p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Readable Iterator</em> concept for value type <tt class="docutils literal"><span class="pre">T</span></tt> if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> being Assignable and Copy Constructible, the following expressions are valid and respect the stated semantics. <tt class="docutils literal"><span class="pre">U</span></tt> is the type of any specified member of type <tt class="docutils literal"><span class="pre">T</span></tt>.</p> <table border="1" class="docutils"> <colgroup> <col width="28%" /> <col width="20%" /> <col width="52%" /> </colgroup> <thead valign="bottom"> <tr><th class="head" colspan="3">Readable Iterator Requirements (in addition to Assignable and Copy Constructible)</th> </tr> <tr><th class="head">Expression</th> <th class="head">Return Type</th> <th class="head">Note/Precondition</th> </tr> </thead> <tbody valign="top"> <tr><td><tt class="docutils literal"><span class="pre">iterator_traits<X>::value_type</span></tt></td> <td><tt class="docutils literal"><span class="pre">T</span></tt></td> <td>Any non-reference, non-cv-qualified type</td> </tr> <tr><td><tt class="docutils literal"><span class="pre">*a</span></tt></td> <td>Convertible to <tt class="docutils literal"><span class="pre">T</span></tt></td> <td><dl class="first last docutils"> <dt>pre: <tt class="docutils literal"><span class="pre">a</span></tt> is dereferenceable. If <tt class="docutils literal"><span class="pre">a</span> <span class="pre">==</span> <span class="pre">b</span></tt> then <tt class="docutils literal"><span class="pre">*a</span></tt></dt> <dd>is equivalent to <tt class="docutils literal"><span class="pre">*b</span></tt>.</dd> </dl> </td> </tr> <tr><td><tt class="docutils literal"><span class="pre">a->m</span></tt></td> <td><tt class="docutils literal"><span class="pre">U&</span></tt></td> <td>pre: <tt class="docutils literal"><span class="pre">pre:</span> <span class="pre">(*a).m</span></tt> is well-defined. Equivalent to <tt class="docutils literal"><span class="pre">(*a).m</span></tt>.</td> </tr> </tbody> </table> </div> <div class="footer"> <hr class="footer" /> <a class="reference external" href="ReadableIterator.rst">View document source</a>. Generated 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. </div> </body> </html>