| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> |
| <title>Intrusive singly linked list: slist</title> |
| <link rel="stylesheet" href="../../../doc/src/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="auto_unlink_hooks.html" title="Auto-unlink hooks"> |
| <link rel="next" href="list.html" title="Intrusive doubly linked list: list"> |
| </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="auto_unlink_hooks.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../intrusive.html"><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="list.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="intrusive.slist"></a><a class="link" href="slist.html" title="Intrusive singly linked list: slist">Intrusive singly linked list: slist</a> |
| </h2></div></div></div> |
| <div class="toc"><dl> |
| <dt><span class="section"><a href="slist.html#intrusive.slist.slist_hooks">slist hooks</a></span></dt> |
| <dt><span class="section"><a href="slist.html#intrusive.slist.slist_container">slist container</a></span></dt> |
| <dt><span class="section"><a href="slist.html#intrusive.slist.slist_example">Example</a></span></dt> |
| </dl></div> |
| <p> |
| <code class="computeroutput"><a class="link" href="../boost/intrusive/slist.html" title="Class template slist">slist</a></code> is the simplest |
| intrusive container of <span class="bold"><strong>Boost.Intrusive</strong></span>: a |
| singly linked list. The memory overhead it imposes is 1 pointer per node. The |
| size of an empty, non constant-time size <code class="computeroutput"><a class="link" href="../boost/intrusive/slist.html" title="Class template slist">slist</a></code> |
| is the size of 1 pointer. This lightweight memory overhead comes with drawbacks, |
| though: many operations have linear time complexity, even some that usually |
| are constant time, like <code class="computeroutput">swap</code>. |
| <code class="computeroutput"><a class="link" href="../boost/intrusive/slist.html" title="Class template slist">slist</a></code> only provides forward |
| iterators. |
| </p> |
| <p> |
| For most cases, a doubly linked list is preferable because it offers more constant-time |
| functions with a slightly bigger size overhead. However, for some applications |
| like constructing more elaborate containers, singly linked lists are essential |
| because of their low size overhead. |
| </p> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="intrusive.slist.slist_hooks"></a><a class="link" href="slist.html#intrusive.slist.slist_hooks" title="slist hooks">slist 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/slist.html" title="Class template slist">slist</a></code> has two hook types: |
| </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">slist_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/slist_base_hook.html" title="Class template slist_base_hook">slist_base_hook</a></code>: |
| the user class derives publicly from <code class="computeroutput"><a class="link" href="../boost/intrusive/slist_base_hook.html" title="Class template slist_base_hook">slist_base_hook</a></code> |
| to make it <code class="computeroutput"><a class="link" href="../boost/intrusive/slist.html" title="Class template slist">slist</a></code>-compatible. |
| </li></ul></div> |
| <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">slist_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/slist_member_hook.html" title="Class template slist_member_hook">slist_member_hook</a></code>: |
| the user class contains a public <code class="computeroutput"><a class="link" href="../boost/intrusive/slist_member_hook.html" title="Class template slist_member_hook">slist_member_hook</a></code> |
| to make it <code class="computeroutput"><a class="link" href="../boost/intrusive/slist.html" title="Class template slist">slist</a></code>-compatible. |
| </li></ul></div> |
| <p> |
| <code class="computeroutput"><a class="link" href="../boost/intrusive/slist_base_hook.html" title="Class template slist_base_hook">slist_base_hook</a></code> |
| and <code class="computeroutput"><a class="link" href="../boost/intrusive/slist_member_hook.html" title="Class template slist_member_hook">slist_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 slist 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"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="intrusive.slist.slist_container"></a><a class="link" href="slist.html#intrusive.slist.slist_container" title="slist container">slist container</a> |
| </h3></div></div></div> |
| <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">slist</span><span class="special">;</span> |
| </pre> |
| <p> |
| <code class="computeroutput"><a class="link" href="../boost/intrusive/slist.html" title="Class template slist">slist</a></code> receives the 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> |
| <p> |
| <code class="computeroutput"><a class="link" href="../boost/intrusive/slist.html" title="Class template slist">slist</a></code> can receive additional |
| options: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| <span class="bold"><strong><code class="computeroutput"><span class="identifier">linear</span><span class="special"><</span><span class="keyword">bool</span> <span class="identifier">Enable</span><span class="special">></span></code></strong></span>: |
| the singly linked list is implemented as a null-terminated list instead |
| of a circular list. This allows <code class="computeroutput"><span class="identifier">O</span><span class="special">(</span><span class="number">1</span><span class="special">)</span></code> |
| swap, but losses some operations like <code class="computeroutput"><span class="identifier">container_from_end_iterator</span></code>. |
| </li> |
| <li class="listitem"> |
| <span class="bold"><strong><code class="computeroutput"><span class="identifier">cache_last</span><span class="special"><</span><span class="keyword">bool</span> <span class="identifier">Enable</span><span class="special">></span></code></strong></span>: |
| the singly linked also stores a pointer to the last element of the singly |
| linked list. This allows <code class="computeroutput"><span class="identifier">O</span><span class="special">(</span><span class="number">1</span><span class="special">)</span></code> |
| swap, <code class="computeroutput"><span class="identifier">splice_after</span><span class="special">(</span><span class="identifier">iterator</span><span class="special">,</span> |
| <span class="identifier">slist</span> <span class="special">&)</span></code> |
| and makes the list offer new functions like <code class="computeroutput"><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">reference</span><span class="special">)</span></code> and <code class="computeroutput"><span class="identifier">back</span><span class="special">()</span></code>. Logically, the size an empty list |
| is increased in <code class="computeroutput"><span class="keyword">sizeof</span><span class="special">(</span><span class="identifier">void_pointer</span><span class="special">)</span></code> |
| and the the cached last node pointer must be updated in every operation, |
| and that might incur in a slight performance impact. |
| </li> |
| </ul></div> |
| <p> |
| <code class="computeroutput"><span class="identifier">auto_unlink</span></code> hooks are not |
| usable if <code class="computeroutput"><span class="identifier">linear</span><span class="special"><</span><span class="keyword">true</span><span class="special">></span></code> and/or |
| <code class="computeroutput"><span class="identifier">cache_last</span><span class="special"><</span><span class="keyword">true</span><span class="special">></span></code> options |
| are used. If <code class="computeroutput"><span class="identifier">auto_unlink</span></code> |
| hooks are used and those options are specified, a static assertion will be |
| raised. |
| </p> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="intrusive.slist.slist_example"></a><a class="link" href="slist.html#intrusive.slist.slist_example" title="Example">Example</a> |
| </h3></div></div></div> |
| <p> |
| Now let's see a small example using both hooks: |
| </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">slist</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="comment">//This is a base hook |
| </span><span class="keyword">class</span> <span class="identifier">MyClass</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">slist_base_hook</span><span class="special"><></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">slist_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 an slist that will store MyClass using the public base hook |
| </span><span class="keyword">typedef</span> <span class="identifier">slist</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 an slist that will store MyClass using the public member hook |
| </span><span class="keyword">typedef</span> <span class="identifier">member_hook</span><span class="special"><</span><span class="identifier">MyClass</span><span class="special">,</span> <span class="identifier">slist_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="identifier">MemberOption</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="identifier">slist</span><span class="special"><</span><span class="identifier">MyClass</span><span class="special">,</span> <span class="identifier">MemberOption</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">BaseList</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">it</span><span class="special">(</span><span class="identifier">baselist</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">baselist</span><span class="special">.</span><span class="identifier">end</span><span class="special">())</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_front</span><span class="special">(*</span><span class="identifier">it</span><span class="special">);</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">iterator</span> <span class="identifier">bit</span><span class="special">(</span><span class="identifier">baselist</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()),</span> <span class="identifier">bitend</span><span class="special">(</span><span class="identifier">baselist</span><span class="special">.</span><span class="identifier">end</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">VectRit</span> <span class="identifier">rit</span><span class="special">(</span><span class="identifier">values</span><span class="special">.</span><span class="identifier">rbegin</span><span class="special">()),</span> <span class="identifier">ritend</span><span class="special">(</span><span class="identifier">values</span><span class="special">.</span><span class="identifier">rend</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">rit</span> <span class="special">!=</span> <span class="identifier">ritend</span><span class="special">;</span> <span class="special">++</span><span class="identifier">rit</span><span class="special">,</span> <span class="special">++</span><span class="identifier">bit</span><span class="special">)</span> |
| <span class="keyword">if</span><span class="special">(&*</span><span class="identifier">bit</span> <span class="special">!=</span> <span class="special">&*</span><span class="identifier">rit</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">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> |
| </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, 2006-2010 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="auto_unlink_hooks.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../intrusive.html"><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="list.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| </body> |
| </html> |