<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Intrusive doubly linked list: list</title> <link rel="stylesheet" href="../boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../intrusive.html" title="Chapter 10. Boost.Intrusive"> <link rel="prev" href="slist.html" title="Intrusive singly linked list: slist"> <link rel="next" href="set_multiset.html" title="Intrusive associative containers: set, multiset, rbtree"> </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="slist.html"><img src="../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../intrusive.html"><img src="../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="set_multiset.html"><img src="../../../doc/html/images/next.png" alt="Next"></a> </div> <div class="section" title="Intrusive doubly linked list: list"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="intrusive.list"></a><a class="link" href="list.html" title="Intrusive doubly linked list: list"> Intrusive doubly linked list: list</a> </h2></div></div></div> <div class="toc"><dl> <dt><span class="section"><a href="list.html#intrusive.list.list_hooks"> list hooks</a></span></dt> <dt><span class="section"><a href="list.html#intrusive.list.list_container"> list container</a></span></dt> <dt><span class="section"><a href="list.html#intrusive.list.list_example"> Example</a></span></dt> </dl></div> <p> <code class="computeroutput"><a class="link" href="../boost/intrusive/list.html" title="Class template list">list</a></code> is a doubly linked list. The memory overhead it imposes is 2 pointers per node. An empty, non constant-time size <code class="computeroutput"><a class="link" href="../boost/intrusive/list.html" title="Class template list">list</a></code> also has the size of 2 pointers. <code class="computeroutput"><a class="link" href="../boost/intrusive/list.html" title="Class template list">list</a></code> has many more constant-time operations than <code class="computeroutput"><a class="link" href="../boost/intrusive/slist.html" title="Class template slist">slist</a></code> and provides a bidirectional iterator. It is recommended to use <code class="computeroutput"><a class="link" href="../boost/intrusive/list.html" title="Class template list">list</a></code> instead of <code class="computeroutput"><a class="link" href="../boost/intrusive/slist.html" title="Class template slist">slist</a></code> if the size overhead is acceptable: </p> <div class="section" title="list hooks"> <div class="titlepage"><div><div><h3 class="title"> <a name="intrusive.list.list_hooks"></a><a class="link" href="list.html#intrusive.list.list_hooks" title="list hooks"> list hooks</a> </h3></div></div></div> <p> Like the rest of <span class="bold"><strong>Boost.Intrusive</strong></span> containers, <code class="computeroutput"><a class="link" href="../boost/intrusive/list.html" title="Class template list">list</a></code> has two hook types: </p> <p> </p> <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="special">...</span><span class="identifier">Options</span><span class="special">></span> <span class="keyword">class</span> <span class="identifier">list_base_hook</span><span class="special">;</span> </pre> <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> <code class="computeroutput"><a class="link" href="../boost/intrusive/list_base_hook.html" title="Class template list_base_hook">list_base_hook</a></code>: the user class derives publicly from <code class="computeroutput"><a class="link" href="../boost/intrusive/list_base_hook.html" title="Class template list_base_hook">list_base_hook</a></code> to make it <code class="computeroutput"><a class="link" href="../boost/intrusive/list.html" title="Class template list">list</a></code>-compatible. </li></ul></div> <p> </p> <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="special">...</span><span class="identifier">Options</span><span class="special">></span> <span class="keyword">class</span> <span class="identifier">list_member_hook</span><span class="special">;</span> </pre> <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> <code class="computeroutput"><a class="link" href="../boost/intrusive/list_member_hook.html" title="Class template list_member_hook">list_member_hook</a></code>: the user class contains a public <code class="computeroutput"><a class="link" href="../boost/intrusive/list_member_hook.html" title="Class template list_member_hook">list_member_hook</a></code> to make it <code class="computeroutput"><a class="link" href="../boost/intrusive/list.html" title="Class template list">list</a></code>-compatible. </li></ul></div> <p> <code class="computeroutput"><a class="link" href="../boost/intrusive/list_base_hook.html" title="Class template list_base_hook">list_base_hook</a></code> and <code class="computeroutput"><a class="link" href="../boost/intrusive/list_member_hook.html" title="Class template list_member_hook">list_member_hook</a></code> receive the same options explained in the section <a class="link" href="usage.html" title="How to use Boost.Intrusive">How to use Boost.Intrusive</a>: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <span class="bold"><strong><code class="computeroutput"><span class="identifier">tag</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Tag</span><span class="special">></span></code></strong></span> (for base hooks only): This argument serves as a tag, so you can derive from more than one list hook. Default: <code class="computeroutput"><span class="identifier">tag</span><span class="special"><</span><span class="identifier">default_tag</span><span class="special">></span></code>. </li> <li class="listitem"> <span class="bold"><strong><code class="computeroutput"><span class="identifier">link_mode</span><span class="special"><</span><span class="identifier">link_mode_type</span> <span class="identifier">LinkMode</span><span class="special">></span></code></strong></span>: The linking policy. Default: <code class="computeroutput"><span class="identifier">link_mode</span><span class="special"><</span><span class="identifier">safe_link</span><span class="special">></span></code>. </li> <li class="listitem"> <span class="bold"><strong><code class="computeroutput"><span class="identifier">void_pointer</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">VoidPointer</span><span class="special">></span></code></strong></span>: The pointer type to be used internally in the hook and propagated to the container. Default: <code class="computeroutput"><span class="identifier">void_pointer</span><span class="special"><</span><span class="keyword">void</span><span class="special">*></span></code>. </li> </ul></div> </div> <div class="section" title="list container"> <div class="titlepage"><div><div><h3 class="title"> <a name="intrusive.list.list_container"></a><a class="link" href="list.html#intrusive.list.list_container" title="list container"> list container</a> </h3></div></div></div> <p> </p> <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="special">...</span><span class="identifier">Options</span><span class="special">></span> <span class="keyword">class</span> <span class="identifier">list</span><span class="special">;</span> </pre> <p> <code class="computeroutput"><a class="link" href="../boost/intrusive/list.html" title="Class template list">list</a></code> receives the same options explained in the section <a class="link" href="usage.html" title="How to use Boost.Intrusive">How to use Boost.Intrusive</a>: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <span class="bold"><strong><code class="computeroutput"><span class="identifier">base_hook</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Hook</span><span class="special">></span></code></strong></span> / <span class="bold"><strong><code class="computeroutput"><span class="identifier">member_hook</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Hook</span><span class="special">,</span> <span class="identifier">Hook</span> <span class="identifier">T</span><span class="special">::*</span> <span class="identifier">PtrToMember</span><span class="special">></span></code></strong></span> / <span class="bold"><strong><code class="computeroutput"><span class="identifier">value_traits</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">ValueTraits</span><span class="special">></span></code></strong></span>: To specify the hook type or value traits used to configure the container. (To learn about value traits go to the section <a class="link" href="value_traits.html" title="Containers with custom ValueTraits">Containers with custom ValueTraits</a>.) </li> <li class="listitem"> <span class="bold"><strong><code class="computeroutput"><span class="identifier">constant_time_size</span><span class="special"><</span><span class="keyword">bool</span> <span class="identifier">Enabled</span><span class="special">></span></code></strong></span>: To activate the constant-time <code class="computeroutput"><span class="identifier">size</span><span class="special">()</span></code> operation. Default: <code class="computeroutput"><span class="identifier">constant_time_size</span><span class="special"><</span><span class="keyword">true</span><span class="special">></span></code> </li> <li class="listitem"> <span class="bold"><strong><code class="computeroutput"><span class="identifier">size_type</span><span class="special"><</span><span class="keyword">bool</span> <span class="identifier">Enabled</span><span class="special">></span></code></strong></span>: To specify the type that will be used to store the size of the container. Default: <code class="computeroutput"><span class="identifier">size_type</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">></span></code> </li> </ul></div> </div> <div class="section" title="Example"> <div class="titlepage"><div><div><h3 class="title"> <a name="intrusive.list.list_example"></a><a class="link" href="list.html#intrusive.list.list_example" title="Example"> Example</a> </h3></div></div></div> <p> Now let's see a small example using both hooks: </p> <p> </p> <p> </p> <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">intrusive</span><span class="special">/</span><span class="identifier">list</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span> <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">intrusive</span><span class="special">;</span> <span class="keyword">class</span> <span class="identifier">MyClass</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">list_base_hook</span><span class="special"><></span> <span class="comment">//This is a derivation hook </span><span class="special">{</span> <span class="keyword">int</span> <span class="identifier">int_</span><span class="special">;</span> <span class="keyword">public</span><span class="special">:</span> <span class="comment">//This is a member hook </span> <span class="identifier">list_member_hook</span><span class="special"><></span> <span class="identifier">member_hook_</span><span class="special">;</span> <span class="identifier">MyClass</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">int_</span><span class="special">(</span><span class="identifier">i</span><span class="special">)</span> <span class="special">{}</span> <span class="special">};</span> <span class="comment">//Define a list that will store MyClass using the public base hook </span><span class="keyword">typedef</span> <span class="identifier">list</span><span class="special"><</span><span class="identifier">MyClass</span><span class="special">></span> <span class="identifier">BaseList</span><span class="special">;</span> <span class="comment">//Define a list that will store MyClass using the public member hook </span><span class="keyword">typedef</span> <span class="identifier">list</span><span class="special"><</span> <span class="identifier">MyClass</span> <span class="special">,</span> <span class="identifier">member_hook</span><span class="special"><</span> <span class="identifier">MyClass</span><span class="special">,</span> <span class="identifier">list_member_hook</span><span class="special"><>,</span> <span class="special">&</span><span class="identifier">MyClass</span><span class="special">::</span><span class="identifier">member_hook_</span><span class="special">></span> <span class="special">></span> <span class="identifier">MemberList</span><span class="special">;</span> <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">MyClass</span><span class="special">>::</span><span class="identifier">iterator</span> <span class="identifier">VectIt</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">MyClass</span><span class="special">>::</span><span class="identifier">reverse_iterator</span> <span class="identifier">VectRit</span><span class="special">;</span> <span class="comment">//Create several MyClass objects, each one with a different value </span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">MyClass</span><span class="special">></span> <span class="identifier">values</span><span class="special">;</span> <span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="number">100</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="identifier">values</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">MyClass</span><span class="special">(</span><span class="identifier">i</span><span class="special">));</span> <span class="identifier">BaseList</span> <span class="identifier">baselist</span><span class="special">;</span> <span class="identifier">MemberList</span> <span class="identifier">memberlist</span><span class="special">;</span> <span class="comment">//Now insert them in the reverse order in the base hook list </span> <span class="keyword">for</span><span class="special">(</span><span class="identifier">VectIt</span> <span class="identifier">it</span><span class="special">(</span><span class="identifier">values</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()),</span> <span class="identifier">itend</span><span class="special">(</span><span class="identifier">values</span><span class="special">.</span><span class="identifier">end</span><span class="special">());</span> <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">itend</span><span class="special">;</span> <span class="special">++</span><span class="identifier">it</span><span class="special">)</span> <span class="identifier">baselist</span><span class="special">.</span><span class="identifier">push_front</span><span class="special">(*</span><span class="identifier">it</span><span class="special">);</span> <span class="comment">//Now insert them in the same order as in vector in the member hook list </span> <span class="keyword">for</span><span class="special">(</span><span class="identifier">VectIt</span> <span class="identifier">it</span><span class="special">(</span><span class="identifier">values</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()),</span> <span class="identifier">itend</span><span class="special">(</span><span class="identifier">values</span><span class="special">.</span><span class="identifier">end</span><span class="special">());</span> <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">itend</span><span class="special">;</span> <span class="special">++</span><span class="identifier">it</span><span class="special">)</span> <span class="identifier">memberlist</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(*</span><span class="identifier">it</span><span class="special">);</span> <span class="comment">//Now test lists </span> <span class="special">{</span> <span class="identifier">BaseList</span><span class="special">::</span><span class="identifier">reverse_iterator</span> <span class="identifier">rbit</span><span class="special">(</span><span class="identifier">baselist</span><span class="special">.</span><span class="identifier">rbegin</span><span class="special">()),</span> <span class="identifier">rbitend</span><span class="special">(</span><span class="identifier">baselist</span><span class="special">.</span><span class="identifier">rend</span><span class="special">());</span> <span class="identifier">MemberList</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">mit</span><span class="special">(</span><span class="identifier">memberlist</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()),</span> <span class="identifier">mitend</span><span class="special">(</span><span class="identifier">memberlist</span><span class="special">.</span><span class="identifier">end</span><span class="special">());</span> <span class="identifier">VectIt</span> <span class="identifier">it</span><span class="special">(</span><span class="identifier">values</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()),</span> <span class="identifier">itend</span><span class="special">(</span><span class="identifier">values</span><span class="special">.</span><span class="identifier">end</span><span class="special">());</span> <span class="comment">//Test the objects inserted in the base hook list </span> <span class="keyword">for</span><span class="special">(;</span> <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">itend</span><span class="special">;</span> <span class="special">++</span><span class="identifier">it</span><span class="special">,</span> <span class="special">++</span><span class="identifier">rbit</span><span class="special">)</span> <span class="keyword">if</span><span class="special">(&*</span><span class="identifier">rbit</span> <span class="special">!=</span> <span class="special">&*</span><span class="identifier">it</span><span class="special">)</span> <span class="keyword">return</span> <span class="number">1</span><span class="special">;</span> <span class="comment">//Test the objects inserted in the member hook list </span> <span class="keyword">for</span><span class="special">(</span><span class="identifier">it</span> <span class="special">=</span> <span class="identifier">values</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">itend</span><span class="special">;</span> <span class="special">++</span><span class="identifier">it</span><span class="special">,</span> <span class="special">++</span><span class="identifier">mit</span><span class="special">)</span> <span class="keyword">if</span><span class="special">(&*</span><span class="identifier">mit</span> <span class="special">!=</span> <span class="special">&*</span><span class="identifier">it</span><span class="special">)</span> <span class="keyword">return</span> <span class="number">1</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> <span class="special">}</span> </pre> <p> </p> <p> </p> </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 © 2005 Olaf Krzikalla, 2006-2009 Ion Gaztanaga<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="slist.html"><img src="../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../intrusive.html"><img src="../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="set_multiset.html"><img src="../../../doc/html/images/next.png" alt="Next"></a> </div> </body> </html>