<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Node algorithms with custom NodeTraits</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="concepts.html" title="Concepts explained"> <link rel="next" href="value_traits.html" title="Containers with custom ValueTraits"> </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="concepts.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="value_traits.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.node_algorithms"></a><a class="link" href="node_algorithms.html" title="Node algorithms with custom NodeTraits"> Node algorithms with custom NodeTraits</a> </h2></div></div></div> <div class="toc"><dl> <dt><span class="section"><a href="node_algorithms.html#intrusive.node_algorithms.circular_slist_algorithms"> Intrusive singly linked list algorithms</a></span></dt> <dt><span class="section"><a href="node_algorithms.html#intrusive.node_algorithms.circular_list_algorithms"> Intrusive doubly linked list algorithms</a></span></dt> <dt><span class="section"><a href="node_algorithms.html#intrusive.node_algorithms.rbtree_algorithms"> Intrusive red-black tree algorithms</a></span></dt> <dt><span class="section"><a href="node_algorithms.html#intrusive.node_algorithms.splaytree_algorithms"> Intrusive splay tree algorithms</a></span></dt> <dt><span class="section"><a href="node_algorithms.html#intrusive.node_algorithms.avltree_algorithms"> Intrusive avl tree algorithms</a></span></dt> <dt><span class="section"><a href="node_algorithms.html#intrusive.node_algorithms.treap_algorithms"> Intrusive treap algorithms</a></span></dt> </dl></div> <p> As explained in the <a class="link" href="concepts.html" title="Concepts explained">Concepts</a> section, <span class="bold"><strong>Boost.Intrusive</strong></span> containers are implemented using node algorithms that work on generic nodes. </p> <p> Sometimes, the use of intrusive containers is expensive for some environments and the programmer might want to avoid all the template instantiations related to <span class="bold"><strong>Boost.Intrusive</strong></span> containers. However, the user can still benefit from <span class="bold"><strong>Boost.Intrusive</strong></span> using the node algorithms, because some of those algorithms, like red-black tree algorithms, are not trivial to write. </p> <p> All node algorithm classes are templatized by a <code class="computeroutput"><span class="identifier">NodeTraits</span></code> class. This class encapsulates the needed internal type declarations and operations to make a node compatible with node algorithms. Each type of node algorithms has its own requirements: </p> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="intrusive.node_algorithms.circular_slist_algorithms"></a><a class="link" href="node_algorithms.html#intrusive.node_algorithms.circular_slist_algorithms" title="Intrusive singly linked list algorithms"> Intrusive singly linked list algorithms</a> </h3></div></div></div> <p> These algorithms are static members of the <code class="computeroutput"><a class="link" href="../boost/intrusive/circular_slist_algorithms.html" title="Class template circular_slist_algorithms">circular_slist_algorithms</a></code> class: </p> <p> </p> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">NodeTraits</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">circular_slist_algorithms</span><span class="special">;</span> </pre> <p> An empty list is formed by a node whose pointer to the next node points to itself. <code class="computeroutput"><a class="link" href="../boost/intrusive/circular_slist_algorithms.html" title="Class template circular_slist_algorithms">circular_slist_algorithms</a></code> is configured with a NodeTraits class, which encapsulates the information about the node to be manipulated. NodeTraits must support the following interface: </p> <p> <span class="bold"><strong>Typedefs</strong></span>: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <code class="computeroutput"><span class="identifier">node</span></code>: The type of the node that forms the circular list </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">node_ptr</span></code>: The type of a pointer to a node (usually node*) </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">const_node_ptr</span></code>: The type of a pointer to a const node (usually const node*) </li> </ul></div> <p> <span class="bold"><strong>Static functions</strong></span>: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_next</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the next node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_next</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">next</span><span class="special">);</span></code>: Sets the pointer to the next node stored in "n" to "next". </li> </ul></div> <p> Once we have a node traits configuration we can use <span class="bold"><strong>Boost.Intrusive</strong></span> algorithms with our nodes: </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">circular_slist_algorithms</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">cassert</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">my_node</span> <span class="special">{</span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">next_</span><span class="special">;</span> <span class="comment">//other members... </span><span class="special">};</span> <span class="comment">//Define our own slist_node_traits </span><span class="keyword">struct</span> <span class="identifier">my_slist_node_traits</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">my_node</span> <span class="identifier">node</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">my_node</span> <span class="special">*</span> <span class="identifier">node_ptr</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span> <span class="identifier">const_node_ptr</span><span class="special">;</span> <span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_next</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">next_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_next</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">next</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">next_</span> <span class="special">=</span> <span class="identifier">next</span><span class="special">;</span> <span class="special">}</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">boost</span><span class="special">::</span><span class="identifier">intrusive</span><span class="special">::</span><span class="identifier">circular_slist_algorithms</span><span class="special"><</span><span class="identifier">my_slist_node_traits</span><span class="special">></span> <span class="identifier">algo</span><span class="special">;</span> <span class="identifier">my_node</span> <span class="identifier">one</span><span class="special">,</span> <span class="identifier">two</span><span class="special">,</span> <span class="identifier">three</span><span class="special">;</span> <span class="comment">//Create an empty singly linked list container: </span> <span class="comment">//"one" will be the first node of the container </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">init_header</span><span class="special">(&</span><span class="identifier">one</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">algo</span><span class="special">::</span><span class="identifier">count</span><span class="special">(&</span><span class="identifier">one</span><span class="special">)</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span> <span class="comment">//Now add a new node </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">link_after</span><span class="special">(&</span><span class="identifier">one</span><span class="special">,</span> <span class="special">&</span><span class="identifier">two</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">algo</span><span class="special">::</span><span class="identifier">count</span><span class="special">(&</span><span class="identifier">one</span><span class="special">)</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span> <span class="comment">//Now add a new node after "one" </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">link_after</span><span class="special">(&</span><span class="identifier">one</span><span class="special">,</span> <span class="special">&</span><span class="identifier">three</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">algo</span><span class="special">::</span><span class="identifier">count</span><span class="special">(&</span><span class="identifier">one</span><span class="special">)</span> <span class="special">==</span> <span class="number">3</span><span class="special">);</span> <span class="comment">//Now unlink the node after one </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">unlink_after</span><span class="special">(&</span><span class="identifier">one</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">algo</span><span class="special">::</span><span class="identifier">count</span><span class="special">(&</span><span class="identifier">one</span><span class="special">)</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span> <span class="comment">//Now unlink two </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">unlink</span><span class="special">(&</span><span class="identifier">two</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">algo</span><span class="special">::</span><span class="identifier">count</span><span class="special">(&</span><span class="identifier">one</span><span class="special">)</span> <span class="special">==</span> <span class="number">1</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> <p> For a complete list of functions see <code class="computeroutput"><a class="link" href="../boost/intrusive/circular_slist_algorithms.html" title="Class template circular_slist_algorithms">circular_slist_algorithms reference</a></code>. </p> </div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="intrusive.node_algorithms.circular_list_algorithms"></a><a class="link" href="node_algorithms.html#intrusive.node_algorithms.circular_list_algorithms" title="Intrusive doubly linked list algorithms"> Intrusive doubly linked list algorithms</a> </h3></div></div></div> <p> These algorithms are static members of the <code class="computeroutput"><a class="link" href="../boost/intrusive/circular_list_algorithms.html" title="Class template circular_list_algorithms">circular_list_algorithms</a></code> class: </p> <p> </p> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">NodeTraits</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">circular_list_algorithms</span><span class="special">;</span> </pre> <p> An empty list is formed by a node whose pointer to the next node points to itself. <code class="computeroutput"><a class="link" href="../boost/intrusive/circular_list_algorithms.html" title="Class template circular_list_algorithms">circular_list_algorithms</a></code> is configured with a NodeTraits class, which encapsulates the information about the node to be manipulated. NodeTraits must support the following interface: </p> <p> <span class="bold"><strong>Typedefs</strong></span>: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <code class="computeroutput"><span class="identifier">node</span></code>: The type of the node that forms the circular list </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">node_ptr</span></code>: The type of a pointer to a node (usually node*) </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">const_node_ptr</span></code>: The type of a pointer to a const node (usually const node*) </li> </ul></div> <p> <span class="bold"><strong>Static functions</strong></span>: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_next</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the next node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_next</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">next</span><span class="special">);</span></code>: Sets the pointer to the next node stored in "n" to "next". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_previous</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the previous node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_previous</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">prev</span><span class="special">);</span></code>: Sets the pointer to the previous node stored in "n" to "prev". </li> </ul></div> <p> Once we have a node traits configuration we can use <span class="bold"><strong>Boost.Intrusive</strong></span> algorithms with our nodes: </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">circular_list_algorithms</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">cassert</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">my_node</span> <span class="special">{</span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">next_</span><span class="special">,</span> <span class="special">*</span><span class="identifier">prev_</span><span class="special">;</span> <span class="comment">//other members... </span><span class="special">};</span> <span class="comment">//Define our own list_node_traits </span><span class="keyword">struct</span> <span class="identifier">my_list_node_traits</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">my_node</span> <span class="identifier">node</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">my_node</span> <span class="special">*</span> <span class="identifier">node_ptr</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span> <span class="identifier">const_node_ptr</span><span class="special">;</span> <span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_next</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">next_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_next</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">next</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">next_</span> <span class="special">=</span> <span class="identifier">next</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">node</span> <span class="special">*</span><span class="identifier">get_previous</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">prev_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_previous</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">prev</span><span class="special">){</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">prev_</span> <span class="special">=</span> <span class="identifier">prev</span><span class="special">;</span> <span class="special">}</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">boost</span><span class="special">::</span><span class="identifier">intrusive</span><span class="special">::</span><span class="identifier">circular_list_algorithms</span><span class="special"><</span><span class="identifier">my_list_node_traits</span><span class="special">></span> <span class="identifier">algo</span><span class="special">;</span> <span class="identifier">my_node</span> <span class="identifier">one</span><span class="special">,</span> <span class="identifier">two</span><span class="special">,</span> <span class="identifier">three</span><span class="special">;</span> <span class="comment">//Create an empty doubly linked list container: </span> <span class="comment">//"one" will be the first node of the container </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">init_header</span><span class="special">(&</span><span class="identifier">one</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">algo</span><span class="special">::</span><span class="identifier">count</span><span class="special">(&</span><span class="identifier">one</span><span class="special">)</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span> <span class="comment">//Now add a new node before "one" </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">link_before</span><span class="special">(&</span><span class="identifier">one</span><span class="special">,</span> <span class="special">&</span><span class="identifier">two</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">algo</span><span class="special">::</span><span class="identifier">count</span><span class="special">(&</span><span class="identifier">one</span><span class="special">)</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span> <span class="comment">//Now add a new node after "two" </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">link_after</span><span class="special">(&</span><span class="identifier">two</span><span class="special">,</span> <span class="special">&</span><span class="identifier">three</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">algo</span><span class="special">::</span><span class="identifier">count</span><span class="special">(&</span><span class="identifier">one</span><span class="special">)</span> <span class="special">==</span> <span class="number">3</span><span class="special">);</span> <span class="comment">//Now unlink the node after one </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">unlink</span><span class="special">(&</span><span class="identifier">three</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">algo</span><span class="special">::</span><span class="identifier">count</span><span class="special">(&</span><span class="identifier">one</span><span class="special">)</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span> <span class="comment">//Now unlink two </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">unlink</span><span class="special">(&</span><span class="identifier">two</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">algo</span><span class="special">::</span><span class="identifier">count</span><span class="special">(&</span><span class="identifier">one</span><span class="special">)</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span> <span class="comment">//Now unlink one </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">unlink</span><span class="special">(&</span><span class="identifier">one</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">algo</span><span class="special">::</span><span class="identifier">count</span><span class="special">(&</span><span class="identifier">one</span><span class="special">)</span> <span class="special">==</span> <span class="number">1</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> <p> For a complete list of functions see <code class="computeroutput"><a class="link" href="../boost/intrusive/circular_list_algorithms.html" title="Class template circular_list_algorithms">circular_list_algorithms reference</a></code>. </p> </div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="intrusive.node_algorithms.rbtree_algorithms"></a><a class="link" href="node_algorithms.html#intrusive.node_algorithms.rbtree_algorithms" title="Intrusive red-black tree algorithms"> Intrusive red-black tree algorithms</a> </h3></div></div></div> <p> These algorithms are static members of the <code class="computeroutput"><a class="link" href="../boost/intrusive/rbtree_algorithms.html" title="Class template rbtree_algorithms">rbtree_algorithms</a></code> class: </p> <p> </p> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">NodeTraits</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">rbtree_algorithms</span><span class="special">;</span> </pre> <p> An empty tree is formed by a node whose pointer to the parent node is null, the left and right node pointers point to itself, and whose color is red. <code class="computeroutput"><a class="link" href="../boost/intrusive/rbtree_algorithms.html" title="Class template rbtree_algorithms">rbtree_algorithms</a></code> is configured with a NodeTraits class, which encapsulates the information about the node to be manipulated. NodeTraits must support the following interface: </p> <p> <span class="bold"><strong>Typedefs</strong></span>: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <code class="computeroutput"><span class="identifier">node</span></code>: The type of the node that forms the circular rbtree </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">node_ptr</span></code>: The type of a pointer to a node (usually node*) </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">const_node_ptr</span></code>: The type of a pointer to a const node (usually const node*) </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">color</span></code>: The type that can store the color of a node </li> </ul></div> <p> <span class="bold"><strong>Static functions</strong></span>: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_parent</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the parent node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_parent</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">p</span><span class="special">);</span></code>: Sets the pointer to the parent node stored in "n" to "p". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_left</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the left node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_left</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">l</span><span class="special">);</span></code>: Sets the pointer to the left node stored in "n" to "l". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_right</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the right node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_right</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">r</span><span class="special">);</span></code>: Sets the pointer to the right node stored in "n" to "r". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">color</span> <span class="identifier">get_color</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns the color stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_color</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">color</span> <span class="identifier">c</span><span class="special">);</span></code>: Sets the color stored in "n" to "c". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">color</span> <span class="identifier">black</span><span class="special">();</span></code>: Returns a value representing the black color. </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">color</span> <span class="identifier">red</span><span class="special">();</span></code>: Returns a value representing the red color. </li> </ul></div> <p> Once we have a node traits configuration we can use <span class="bold"><strong>Boost.Intrusive</strong></span> algorithms with our nodes: </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">rbtree_algorithms</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">cassert</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">my_node</span> <span class="special">{</span> <span class="identifier">my_node</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="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="identifier">my_node</span> <span class="special">*</span><span class="identifier">parent_</span><span class="special">,</span> <span class="special">*</span><span class="identifier">left_</span><span class="special">,</span> <span class="special">*</span><span class="identifier">right_</span><span class="special">;</span> <span class="keyword">int</span> <span class="identifier">color_</span><span class="special">;</span> <span class="comment">//other members </span> <span class="keyword">int</span> <span class="identifier">int_</span><span class="special">;</span> <span class="special">};</span> <span class="comment">//Define our own rbtree_node_traits </span><span class="keyword">struct</span> <span class="identifier">my_rbtree_node_traits</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">my_node</span> <span class="identifier">node</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">my_node</span> <span class="special">*</span> <span class="identifier">node_ptr</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span> <span class="identifier">const_node_ptr</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="keyword">int</span> <span class="identifier">color</span><span class="special">;</span> <span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_parent</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">parent_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_parent</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">parent</span><span class="special">){</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">parent_</span> <span class="special">=</span> <span class="identifier">parent</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_left</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">left_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_left</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">left</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">left_</span> <span class="special">=</span> <span class="identifier">left</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_right</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">right_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_right</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">right</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">right_</span> <span class="special">=</span> <span class="identifier">right</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">color</span> <span class="identifier">get_color</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">color_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_color</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">color</span> <span class="identifier">c</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">color_</span> <span class="special">=</span> <span class="identifier">c</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">color</span> <span class="identifier">black</span><span class="special">()</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">color</span><span class="special">(</span><span class="number">0</span><span class="special">);</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">color</span> <span class="identifier">red</span><span class="special">()</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">color</span><span class="special">(</span><span class="number">1</span><span class="special">);</span> <span class="special">}</span> <span class="special">};</span> <span class="keyword">struct</span> <span class="identifier">node_ptr_compare</span> <span class="special">{</span> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">a</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">b</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">a</span><span class="special">-></span><span class="identifier">int_</span> <span class="special"><</span> <span class="identifier">b</span><span class="special">-></span><span class="identifier">int_</span><span class="special">;</span> <span class="special">}</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">boost</span><span class="special">::</span><span class="identifier">intrusive</span><span class="special">::</span><span class="identifier">rbtree_algorithms</span><span class="special"><</span><span class="identifier">my_rbtree_node_traits</span><span class="special">></span> <span class="identifier">algo</span><span class="special">;</span> <span class="identifier">my_node</span> <span class="identifier">header</span><span class="special">,</span> <span class="identifier">two</span><span class="special">(</span><span class="number">2</span><span class="special">),</span> <span class="identifier">three</span><span class="special">(</span><span class="number">3</span><span class="special">);</span> <span class="comment">//Create an empty rbtree container: </span> <span class="comment">//"header" will be the header node of the tree </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">init_header</span><span class="special">(&</span><span class="identifier">header</span><span class="special">);</span> <span class="comment">//Now insert node "two" in the tree using the sorting functor </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">insert_equal_upper_bound</span><span class="special">(&</span><span class="identifier">header</span><span class="special">,</span> <span class="special">&</span><span class="identifier">two</span><span class="special">,</span> <span class="identifier">node_ptr_compare</span><span class="special">());</span> <span class="comment">//Now insert node "three" in the tree using the sorting functor </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">insert_equal_lower_bound</span><span class="special">(&</span><span class="identifier">header</span><span class="special">,</span> <span class="special">&</span><span class="identifier">three</span><span class="special">,</span> <span class="identifier">node_ptr_compare</span><span class="special">());</span> <span class="comment">//Now take the first node (the left node of the header) </span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">n</span> <span class="special">=</span> <span class="identifier">header</span><span class="special">.</span><span class="identifier">left_</span><span class="special">;</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">n</span> <span class="special">==</span> <span class="special">&</span><span class="identifier">two</span><span class="special">);</span> <span class="comment">//Now go to the next node </span> <span class="identifier">n</span> <span class="special">=</span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">next_node</span><span class="special">(</span><span class="identifier">n</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">n</span> <span class="special">==</span> <span class="special">&</span><span class="identifier">three</span><span class="special">);</span> <span class="comment">//Erase a node just using a pointer to it </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">unlink</span><span class="special">(&</span><span class="identifier">two</span><span class="special">);</span> <span class="comment">//Erase a node using also the header (faster) </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">erase</span><span class="special">(&</span><span class="identifier">header</span><span class="special">,</span> <span class="special">&</span><span class="identifier">three</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> <p> For a complete list of functions see <code class="computeroutput"><a class="link" href="../boost/intrusive/rbtree_algorithms.html" title="Class template rbtree_algorithms">rbtree_algorithms reference</a></code>. </p> </div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="intrusive.node_algorithms.splaytree_algorithms"></a><a class="link" href="node_algorithms.html#intrusive.node_algorithms.splaytree_algorithms" title="Intrusive splay tree algorithms"> Intrusive splay tree algorithms</a> </h3></div></div></div> <p> These algorithms are static members of the <code class="computeroutput"><a class="link" href="../boost/intrusive/splaytree_algorithms.html" title="Class template splaytree_algorithms">splaytree_algorithms</a></code> class: </p> <p> </p> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">NodeTraits</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">splaytree_algorithms</span><span class="special">;</span> </pre> <p> An empty tree is formed by a node whose pointer to the parent node is null, and whose left and right nodes pointers point to itself. <code class="computeroutput"><a class="link" href="../boost/intrusive/splaytree_algorithms.html" title="Class template splaytree_algorithms">splaytree_algorithms</a></code> is configured with a NodeTraits class, which encapsulates the information about the node to be manipulated. NodeTraits must support the following interface: </p> <p> <span class="bold"><strong>Typedefs</strong></span>: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <code class="computeroutput"><span class="identifier">node</span></code>: The type of the node that forms the circular splaytree </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">node_ptr</span></code>: The type of a pointer to a node (usually node*) </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">const_node_ptr</span></code>: The type of a pointer to a const node (usually const node*) </li> </ul></div> <p> <span class="bold"><strong>Static functions</strong></span>: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_parent</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the parent node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_parent</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">p</span><span class="special">);</span></code>: Sets the pointer to the parent node stored in "n" to "p". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_left</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the left node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_left</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">l</span><span class="special">);</span></code>: Sets the pointer to the left node stored in "n" to "l". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_right</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the right node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_right</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">r</span><span class="special">);</span></code>: Sets the pointer to the right node stored in "n" to "r". </li> </ul></div> <p> Once we have a node traits configuration we can use <span class="bold"><strong>Boost.Intrusive</strong></span> algorithms with our nodes: </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">splaytree_algorithms</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">cassert</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">my_node</span> <span class="special">{</span> <span class="identifier">my_node</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="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="identifier">my_node</span> <span class="special">*</span><span class="identifier">parent_</span><span class="special">,</span> <span class="special">*</span><span class="identifier">left_</span><span class="special">,</span> <span class="special">*</span><span class="identifier">right_</span><span class="special">;</span> <span class="comment">//other members </span> <span class="keyword">int</span> <span class="identifier">int_</span><span class="special">;</span> <span class="special">};</span> <span class="comment">//Define our own splaytree_node_traits </span><span class="keyword">struct</span> <span class="identifier">my_splaytree_node_traits</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">my_node</span> <span class="identifier">node</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">my_node</span> <span class="special">*</span> <span class="identifier">node_ptr</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span> <span class="identifier">const_node_ptr</span><span class="special">;</span> <span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_parent</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">parent_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_parent</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">parent</span><span class="special">){</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">parent_</span> <span class="special">=</span> <span class="identifier">parent</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_left</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">left_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_left</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">left</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">left_</span> <span class="special">=</span> <span class="identifier">left</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_right</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">right_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_right</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">right</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">right_</span> <span class="special">=</span> <span class="identifier">right</span><span class="special">;</span> <span class="special">}</span> <span class="special">};</span> <span class="keyword">struct</span> <span class="identifier">node_ptr_compare</span> <span class="special">{</span> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">a</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">b</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">a</span><span class="special">-></span><span class="identifier">int_</span> <span class="special"><</span> <span class="identifier">b</span><span class="special">-></span><span class="identifier">int_</span><span class="special">;</span> <span class="special">}</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">boost</span><span class="special">::</span><span class="identifier">intrusive</span><span class="special">::</span><span class="identifier">splaytree_algorithms</span><span class="special"><</span><span class="identifier">my_splaytree_node_traits</span><span class="special">></span> <span class="identifier">algo</span><span class="special">;</span> <span class="identifier">my_node</span> <span class="identifier">header</span><span class="special">,</span> <span class="identifier">two</span><span class="special">(</span><span class="number">2</span><span class="special">),</span> <span class="identifier">three</span><span class="special">(</span><span class="number">3</span><span class="special">);</span> <span class="comment">//Create an empty splaytree container: </span> <span class="comment">//"header" will be the header node of the tree </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">init_header</span><span class="special">(&</span><span class="identifier">header</span><span class="special">);</span> <span class="comment">//Now insert node "two" in the tree using the sorting functor </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">insert_equal_upper_bound</span><span class="special">(&</span><span class="identifier">header</span><span class="special">,</span> <span class="special">&</span><span class="identifier">two</span><span class="special">,</span> <span class="identifier">node_ptr_compare</span><span class="special">());</span> <span class="comment">//Now insert node "three" in the tree using the sorting functor </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">insert_equal_lower_bound</span><span class="special">(&</span><span class="identifier">header</span><span class="special">,</span> <span class="special">&</span><span class="identifier">three</span><span class="special">,</span> <span class="identifier">node_ptr_compare</span><span class="special">());</span> <span class="comment">//Now take the first node (the left node of the header) </span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">n</span> <span class="special">=</span> <span class="identifier">header</span><span class="special">.</span><span class="identifier">left_</span><span class="special">;</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">n</span> <span class="special">==</span> <span class="special">&</span><span class="identifier">two</span><span class="special">);</span> <span class="comment">//Now go to the next node </span> <span class="identifier">n</span> <span class="special">=</span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">next_node</span><span class="special">(</span><span class="identifier">n</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">n</span> <span class="special">==</span> <span class="special">&</span><span class="identifier">three</span><span class="special">);</span> <span class="comment">//Erase a node just using a pointer to it </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">unlink</span><span class="special">(&</span><span class="identifier">two</span><span class="special">);</span> <span class="comment">//Erase a node using also the header (faster) </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">erase</span><span class="special">(&</span><span class="identifier">header</span><span class="special">,</span> <span class="special">&</span><span class="identifier">three</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> <p> For a complete list of functions see <code class="computeroutput"><a class="link" href="../boost/intrusive/splaytree_algorithms.html" title="Class template splaytree_algorithms">splaytree_algorithms reference</a></code>. </p> </div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="intrusive.node_algorithms.avltree_algorithms"></a><a class="link" href="node_algorithms.html#intrusive.node_algorithms.avltree_algorithms" title="Intrusive avl tree algorithms"> Intrusive avl tree algorithms</a> </h3></div></div></div> <p> <code class="computeroutput"><a class="link" href="../boost/intrusive/avltree_algorithms.html" title="Class template avltree_algorithms">avltree_algorithms</a></code> have the same interface as <code class="computeroutput"><a class="link" href="../boost/intrusive/rbtree_algorithms.html" title="Class template rbtree_algorithms">rbtree_algorithms</a></code>. </p> <p> </p> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">NodeTraits</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">avltree_algorithms</span><span class="special">;</span> </pre> <p> <code class="computeroutput"><a class="link" href="../boost/intrusive/avltree_algorithms.html" title="Class template avltree_algorithms">avltree_algorithms</a></code> is configured with a NodeTraits class, which encapsulates the information about the node to be manipulated. NodeTraits must support the following interface: </p> <p> <span class="bold"><strong>Typedefs</strong></span>: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <code class="computeroutput"><span class="identifier">node</span></code>: The type of the node that forms the circular avltree </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">node_ptr</span></code>: The type of a pointer to a node (usually node*) </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">const_node_ptr</span></code>: The type of a pointer to a const node (usually const node*) </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">balance</span></code>: A type that can represent 3 balance types (usually an integer) </li> </ul></div> <p> <span class="bold"><strong>Static functions</strong></span>: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_parent</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the parent node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_parent</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">p</span><span class="special">);</span></code>: Sets the pointer to the parent node stored in "n" to "p". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_left</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the left node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_left</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">l</span><span class="special">);</span></code>: Sets the pointer to the left node stored in "n" to "l". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_right</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the right node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_right</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">r</span><span class="special">);</span></code>: Sets the pointer to the right node stored in "n" to "r". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">balance</span> <span class="identifier">get_balance</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns the balance factor stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_balance</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">balance</span> <span class="identifier">b</span><span class="special">);</span></code>: Sets the balance factor stored in "n" to "b". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">balance</span> <span class="identifier">negative</span><span class="special">();</span></code>: Returns a value representing a negative balance factor. </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">balance</span> <span class="identifier">zero</span><span class="special">();</span></code>: Returns a value representing a zero balance factor. </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">balance</span> <span class="identifier">positive</span><span class="special">();</span></code>: Returns a value representing a positive balance factor. </li> </ul></div> <p> Once we have a node traits configuration we can use <span class="bold"><strong>Boost.Intrusive</strong></span> algorithms with our nodes: </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">avltree_algorithms</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">cassert</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">my_node</span> <span class="special">{</span> <span class="identifier">my_node</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="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="identifier">my_node</span> <span class="special">*</span><span class="identifier">parent_</span><span class="special">,</span> <span class="special">*</span><span class="identifier">left_</span><span class="special">,</span> <span class="special">*</span><span class="identifier">right_</span><span class="special">;</span> <span class="keyword">int</span> <span class="identifier">balance_</span><span class="special">;</span> <span class="comment">//other members </span> <span class="keyword">int</span> <span class="identifier">int_</span><span class="special">;</span> <span class="special">};</span> <span class="comment">//Define our own avltree_node_traits </span><span class="keyword">struct</span> <span class="identifier">my_avltree_node_traits</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">my_node</span> <span class="identifier">node</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">my_node</span> <span class="special">*</span> <span class="identifier">node_ptr</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span> <span class="identifier">const_node_ptr</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="keyword">int</span> <span class="identifier">balance</span><span class="special">;</span> <span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_parent</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">parent_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_parent</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">parent</span><span class="special">){</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">parent_</span> <span class="special">=</span> <span class="identifier">parent</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_left</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">left_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_left</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">left</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">left_</span> <span class="special">=</span> <span class="identifier">left</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_right</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">right_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_right</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">right</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">right_</span> <span class="special">=</span> <span class="identifier">right</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">balance</span> <span class="identifier">get_balance</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">balance_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_balance</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">balance</span> <span class="identifier">b</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">balance_</span> <span class="special">=</span> <span class="identifier">b</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">balance</span> <span class="identifier">negative</span><span class="special">()</span> <span class="special">{</span> <span class="keyword">return</span> <span class="special">-</span><span class="number">1</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">balance</span> <span class="identifier">zero</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> <span class="keyword">static</span> <span class="identifier">balance</span> <span class="identifier">positive</span><span class="special">()</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="special">};</span> <span class="keyword">struct</span> <span class="identifier">node_ptr_compare</span> <span class="special">{</span> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">a</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">b</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">a</span><span class="special">-></span><span class="identifier">int_</span> <span class="special"><</span> <span class="identifier">b</span><span class="special">-></span><span class="identifier">int_</span><span class="special">;</span> <span class="special">}</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">boost</span><span class="special">::</span><span class="identifier">intrusive</span><span class="special">::</span><span class="identifier">avltree_algorithms</span><span class="special"><</span><span class="identifier">my_avltree_node_traits</span><span class="special">></span> <span class="identifier">algo</span><span class="special">;</span> <span class="identifier">my_node</span> <span class="identifier">header</span><span class="special">,</span> <span class="identifier">two</span><span class="special">(</span><span class="number">2</span><span class="special">),</span> <span class="identifier">three</span><span class="special">(</span><span class="number">3</span><span class="special">);</span> <span class="comment">//Create an empty avltree container: </span> <span class="comment">//"header" will be the header node of the tree </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">init_header</span><span class="special">(&</span><span class="identifier">header</span><span class="special">);</span> <span class="comment">//Now insert node "two" in the tree using the sorting functor </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">insert_equal_upper_bound</span><span class="special">(&</span><span class="identifier">header</span><span class="special">,</span> <span class="special">&</span><span class="identifier">two</span><span class="special">,</span> <span class="identifier">node_ptr_compare</span><span class="special">());</span> <span class="comment">//Now insert node "three" in the tree using the sorting functor </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">insert_equal_lower_bound</span><span class="special">(&</span><span class="identifier">header</span><span class="special">,</span> <span class="special">&</span><span class="identifier">three</span><span class="special">,</span> <span class="identifier">node_ptr_compare</span><span class="special">());</span> <span class="comment">//Now take the first node (the left node of the header) </span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">n</span> <span class="special">=</span> <span class="identifier">header</span><span class="special">.</span><span class="identifier">left_</span><span class="special">;</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">n</span> <span class="special">==</span> <span class="special">&</span><span class="identifier">two</span><span class="special">);</span> <span class="comment">//Now go to the next node </span> <span class="identifier">n</span> <span class="special">=</span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">next_node</span><span class="special">(</span><span class="identifier">n</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">n</span> <span class="special">==</span> <span class="special">&</span><span class="identifier">three</span><span class="special">);</span> <span class="comment">//Erase a node just using a pointer to it </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">unlink</span><span class="special">(&</span><span class="identifier">two</span><span class="special">);</span> <span class="comment">//Erase a node using also the header (faster) </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">erase</span><span class="special">(&</span><span class="identifier">header</span><span class="special">,</span> <span class="special">&</span><span class="identifier">three</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> <p> For a complete list of functions see <code class="computeroutput"><a class="link" href="../boost/intrusive/avltree_algorithms.html" title="Class template avltree_algorithms">avltree_algorithms reference</a></code>. </p> </div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="intrusive.node_algorithms.treap_algorithms"></a><a class="link" href="node_algorithms.html#intrusive.node_algorithms.treap_algorithms" title="Intrusive treap algorithms"> Intrusive treap algorithms</a> </h3></div></div></div> <p> <code class="computeroutput"><a class="link" href="../boost/intrusive/treap_algorithms.html" title="Class template treap_algorithms">treap_algorithms</a></code> have the same interface as <code class="computeroutput"><a class="link" href="../boost/intrusive/rbtree_algorithms.html" title="Class template rbtree_algorithms">rbtree_algorithms</a></code>. </p> <p> </p> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">NodeTraits</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">treap_algorithms</span><span class="special">;</span> </pre> <p> <code class="computeroutput"><a class="link" href="../boost/intrusive/treap_algorithms.html" title="Class template treap_algorithms">treap_algorithms</a></code> is configured with a NodeTraits class, which encapsulates the information about the node to be manipulated. NodeTraits must support the following interface: </p> <p> <span class="bold"><strong>Typedefs</strong></span>: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <code class="computeroutput"><span class="identifier">node</span></code>: The type of the node that forms the circular treap </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">node_ptr</span></code>: The type of a pointer to a node (usually node*) </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">const_node_ptr</span></code>: The type of a pointer to a const node (usually const node*) </li> </ul></div> <p> <span class="bold"><strong>Static functions</strong></span>: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_parent</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the parent node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_parent</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">p</span><span class="special">);</span></code>: Sets the pointer to the parent node stored in "n" to "p". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_left</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the left node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_left</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">l</span><span class="special">);</span></code>: Sets the pointer to the left node stored in "n" to "l". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_right</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">);</span></code>: Returns a pointer to the right node stored in "n". </li> <li class="listitem"> <code class="computeroutput"><span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_right</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">r</span><span class="special">);</span></code>: Sets the pointer to the right node stored in "n" to "r". </li> </ul></div> <p> Once we have a node traits configuration we can use <span class="bold"><strong>Boost.Intrusive</strong></span> algorithms with our nodes: </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">treap_algorithms</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">cassert</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">my_node</span> <span class="special">{</span> <span class="identifier">my_node</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="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">priority</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">prio_</span><span class="special">(</span><span class="identifier">priority</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="identifier">my_node</span> <span class="special">*</span><span class="identifier">parent_</span><span class="special">,</span> <span class="special">*</span><span class="identifier">left_</span><span class="special">,</span> <span class="special">*</span><span class="identifier">right_</span><span class="special">;</span> <span class="keyword">int</span> <span class="identifier">prio_</span><span class="special">;</span> <span class="comment">//other members </span> <span class="keyword">int</span> <span class="identifier">int_</span><span class="special">;</span> <span class="special">};</span> <span class="comment">//Define our own treap_node_traits </span><span class="keyword">struct</span> <span class="identifier">my_treap_node_traits</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">my_node</span> <span class="identifier">node</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">my_node</span> <span class="special">*</span> <span class="identifier">node_ptr</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span> <span class="identifier">const_node_ptr</span><span class="special">;</span> <span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_parent</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">parent_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_parent</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">parent</span><span class="special">){</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">parent_</span> <span class="special">=</span> <span class="identifier">parent</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_left</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">left_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_left</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">left</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">left_</span> <span class="special">=</span> <span class="identifier">left</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="identifier">node_ptr</span> <span class="identifier">get_right</span><span class="special">(</span><span class="identifier">const_node_ptr</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">right_</span><span class="special">;</span> <span class="special">}</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">set_right</span><span class="special">(</span><span class="identifier">node_ptr</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">node_ptr</span> <span class="identifier">right</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">n</span><span class="special">-></span><span class="identifier">right_</span> <span class="special">=</span> <span class="identifier">right</span><span class="special">;</span> <span class="special">}</span> <span class="special">};</span> <span class="keyword">struct</span> <span class="identifier">node_ptr_compare</span> <span class="special">{</span> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">a</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">b</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">a</span><span class="special">-></span><span class="identifier">int_</span> <span class="special"><</span> <span class="identifier">b</span><span class="special">-></span><span class="identifier">int_</span><span class="special">;</span> <span class="special">}</span> <span class="special">};</span> <span class="keyword">struct</span> <span class="identifier">node_ptr_priority</span> <span class="special">{</span> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">a</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">b</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">a</span><span class="special">-></span><span class="identifier">prio_</span> <span class="special"><</span> <span class="identifier">b</span><span class="special">-></span><span class="identifier">prio_</span><span class="special">;}</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">boost</span><span class="special">::</span><span class="identifier">intrusive</span><span class="special">::</span><span class="identifier">treap_algorithms</span><span class="special"><</span><span class="identifier">my_treap_node_traits</span><span class="special">></span> <span class="identifier">algo</span><span class="special">;</span> <span class="identifier">my_node</span> <span class="identifier">header</span><span class="special">,</span> <span class="identifier">two</span><span class="special">(</span><span class="number">2</span><span class="special">,</span> <span class="number">5</span><span class="special">),</span> <span class="identifier">three</span><span class="special">(</span><span class="number">3</span><span class="special">,</span> <span class="number">1</span><span class="special">);</span> <span class="comment">//Create an empty treap container: </span> <span class="comment">//"header" will be the header node of the tree </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">init_header</span><span class="special">(&</span><span class="identifier">header</span><span class="special">);</span> <span class="comment">//Now insert node "two" in the tree using the sorting functor </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">insert_equal_upper_bound</span><span class="special">(&</span><span class="identifier">header</span><span class="special">,</span> <span class="special">&</span><span class="identifier">two</span><span class="special">,</span> <span class="identifier">node_ptr_compare</span><span class="special">(),</span> <span class="identifier">node_ptr_priority</span><span class="special">());</span> <span class="comment">//Now insert node "three" in the tree using the sorting functor </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">insert_equal_lower_bound</span><span class="special">(&</span><span class="identifier">header</span><span class="special">,</span> <span class="special">&</span><span class="identifier">three</span><span class="special">,</span> <span class="identifier">node_ptr_compare</span><span class="special">(),</span> <span class="identifier">node_ptr_priority</span><span class="special">());</span> <span class="comment">//Now take the first node (the left node of the header) </span> <span class="identifier">my_node</span> <span class="special">*</span><span class="identifier">n</span> <span class="special">=</span> <span class="identifier">header</span><span class="special">.</span><span class="identifier">left_</span><span class="special">;</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">n</span> <span class="special">==</span> <span class="special">&</span><span class="identifier">two</span><span class="special">);</span> <span class="comment">//Now go to the next node </span> <span class="identifier">n</span> <span class="special">=</span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">next_node</span><span class="special">(</span><span class="identifier">n</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">n</span> <span class="special">==</span> <span class="special">&</span><span class="identifier">three</span><span class="special">);</span> <span class="comment">//Erase a node just using a pointer to it </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">unlink</span><span class="special">(&</span><span class="identifier">two</span><span class="special">,</span> <span class="identifier">node_ptr_priority</span><span class="special">());</span> <span class="comment">//Erase a node using also the header (faster) </span> <span class="identifier">algo</span><span class="special">::</span><span class="identifier">erase</span><span class="special">(&</span><span class="identifier">header</span><span class="special">,</span> <span class="special">&</span><span class="identifier">three</span><span class="special">,</span> <span class="identifier">node_ptr_priority</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> <p> For a complete list of functions see <code class="computeroutput"><a class="link" href="../boost/intrusive/treap_algorithms.html" title="Class template treap_algorithms">treap_algorithms reference</a></code>. </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="concepts.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="value_traits.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>