<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Struct template iterator</title> <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../../boost_typeerasure/reference.html#header.boost.type_erasure.iterator_hpp" title="Header <boost/type_erasure/iterator.hpp>"> <link rel="prev" href="forward_iterator.html" title="Struct template forward_iterator"> <link rel="next" href="random_access_iterator.html" title="Struct template random_access_iterator"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> <td align="center"><a href="../../../../index.html">Home</a></td> <td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="forward_iterator.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_typeerasure/reference.html#header.boost.type_erasure.iterator_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="random_access_iterator.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="refentry"> <a name="boost.type_erasure.iterator"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Struct template iterator</span></h2> <p>boost::type_erasure::iterator</p> </div> <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../boost_typeerasure/reference.html#header.boost.type_erasure.iterator_hpp" title="Header <boost/type_erasure/iterator.hpp>">boost/type_erasure/iterator.hpp</a>> </span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Traversal<span class="special">,</span> <span class="keyword">typename</span> T <span class="special">=</span> <a class="link" href="_self.html" title="Struct _self">_self</a><span class="special">,</span> <span class="keyword">typename</span> Reference <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">use_default</span><span class="special">,</span> <span class="keyword">typename</span> DifferenceType <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="iterator.html" title="Struct template iterator">iterator</a> <span class="special">{</span> <span class="comment">// types</span> <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="boost.type_erasure.iterator.value_type"></a><span class="identifier">value_type</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">Reference</span> <a name="boost.type_erasure.iterator.reference"></a><span class="identifier">reference</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">DifferenceType</span> <a name="boost.type_erasure.iterator.difference_type"></a><span class="identifier">difference_type</span><span class="special">;</span> <span class="special">}</span><span class="special">;</span></pre></div> <div class="refsect1"> <a name="idm45555078551408"></a><h2>Description</h2> <p>The <a class="link" href="iterator.html" title="Struct template iterator">iterator</a> concept can be used for any iterator category.</p> <p> The value_type of the iterator is deduced. To force it to be a specific type, use the <a class="link" href="same_type.html" title="Struct template same_type">same_type</a> concept.</p> <p>Example:</p> <pre class="programlisting"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span> <span class="identifier">iterator</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">forward_traversal_tag</span><span class="special">></span><span class="special">,</span> <span class="identifier">same_type</span><span class="special"><</span><span class="identifier">iterator</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">forward_traversal_tag</span><span class="special">></span><span class="special">::</span><span class="identifier">value_type</span><span class="special">,</span> <span class="keyword">int</span><span class="special">></span> <span class="special">></span> <span class="identifier">int_it</span><span class="special">;</span> </pre> <p> </p> <div class="refsect2"> <a name="idm45555078532064"></a><h3>Template Parameters</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout"><span class="keyword">typename</span> Traversal</pre> <p>must be one of <code class="computeroutput">boost::incrementable_traversal_tag</code>, <code class="computeroutput">boost::single_pass_traversal_tag</code>, <code class="computeroutput">boost::forward_traversal_tag</code>, <code class="computeroutput">boost::bidirectional_traversal_tag</code>, and <code class="computeroutput">boost::random_access_traversal_tag</code>. </p> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">typename</span> T <span class="special">=</span> <a class="link" href="_self.html" title="Struct _self">_self</a></pre> <p>The placeholder representing the iterator. </p> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">typename</span> Reference <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">use_default</span></pre> <p>The reference type. If it is boost::use_default, then reference will be value_type&. </p> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">typename</span> DifferenceType <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span></pre> <p>The iterator's difference type.</p> </li> </ol></div> </div> </div> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2011-2013 Steven Watanabe<p> Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="forward_iterator.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_typeerasure/reference.html#header.boost.type_erasure.iterator_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="random_access_iterator.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>