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<a accesskey="p" href="avl_set_multiset.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="sg_set_multiset.html"><img src="../../../doc/src/images/next.png" alt="Next"></a>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="intrusive.splay_set_multiset"></a><a class="link" href="splay_set_multiset.html" title="Intrusive splay tree based associative containers: splay_set, splay_multiset and , splay_tree">Intrusive splay tree based
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associative containers: splay_set, splay_multiset and , splay_tree</a>
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</h2></div></div></div>
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<div class="toc"><dl class="toc">
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<dt><span class="section"><a href="splay_set_multiset.html#intrusive.splay_set_multiset.splay_set_multiset_disadvantages">Advantages
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and disadvantages of splay tree based containers</a></span></dt>
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<dt><span class="section"><a href="splay_set_multiset.html#intrusive.splay_set_multiset.set_multiset_containers">splay_set,
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splay_multiset and splaytree containers</a></span></dt>
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<dt><span class="section"><a href="splay_set_multiset.html#intrusive.splay_set_multiset.splay_set_multiset_example">Example</a></span></dt>
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</dl></div>
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<p>
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C++ associative containers are usually based on red-black tree implementations
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(e.g.: STL, Boost.Intrusive associative containers). However, there are other
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interesting data structures that offer some advantages (and also disadvantages).
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</p>
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<p>
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Splay trees are self-adjusting binary search trees used typically in caches,
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memory allocators and other applications, because splay trees have a "caching
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effect": recently accessed elements have better access times than elements
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accessed less frequently. For more information on splay trees see <a href="http://en.wikipedia.org/wiki/Splay_tree" target="_top">the
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corresponding Wikipedia entry</a>.
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</p>
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<p>
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<span class="bold"><strong>Boost.Intrusive</strong></span> offers 3 containers based
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on splay trees: <code class="computeroutput"><a class="link" href="../boost/intrusive/splay_set.html" title="Class template splay_set">splay_set</a></code>,
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<code class="computeroutput"><a class="link" href="../boost/intrusive/splay_multiset.html" title="Class template splay_multiset">splay_multiset</a></code>
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and <code class="computeroutput"><a class="link" href="../boost/intrusive/splaytree.html" title="Class template splaytree">splaytree</a></code>. The
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first two are similar to <code class="computeroutput"><a class="link" href="../boost/intrusive/set.html" title="Class template set">set</a></code>
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or <code class="computeroutput"><a class="link" href="../boost/intrusive/multiset.html" title="Class template multiset">multiset</a></code> and the
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latter is a generalization that offers functions both to insert unique and
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multiple keys.
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</p>
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<p>
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The memory overhead of these containers with Boost.Intrusive hooks is usually
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3 pointers. An empty, non constant-time size splay container has also a size
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of 3 pointers.
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</p>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="intrusive.splay_set_multiset.splay_set_multiset_disadvantages"></a><a class="link" href="splay_set_multiset.html#intrusive.splay_set_multiset.splay_set_multiset_disadvantages" title="Advantages and disadvantages of splay tree based containers">Advantages
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and disadvantages of splay tree based containers</a>
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</h3></div></div></div>
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<p>
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Splay tree based intrusive containers have logarithmic complexity in many
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operations like searches, insertions, erasures, etc., but if some elements
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are more frequently accessed than others, splay trees perform faster searches
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than equivalent balanced binary trees (such as red-black trees).
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</p>
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<p>
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The caching effect offered by splay trees comes with a cost: the tree must
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be rebalanced when an element is searched. To maintain const-correctness
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and thread-safety guarantees, this caching effect is not updated when const
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versions of search functions like <code class="computeroutput"><span class="identifier">find</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">lower_bound</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">upper_bound</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">equal_range</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">count</span><span class="special">()</span></code>... are called. This means that using splay-tree
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based associative containers as drop-in replacements of <code class="computeroutput"><a class="link" href="../boost/intrusive/set.html" title="Class template set">set</a></code>/
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<code class="computeroutput"><a class="link" href="../boost/intrusive/multiset.html" title="Class template multiset">multiset</a></code>, specially
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for const search functions, might not result in desired performance improvements.
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</p>
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<p>
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If element searches are randomized, the tree will be continuously srebalanced
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without taking advantage of the cache effect, so splay trees can offer worse
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performance than other balanced trees for several search patterns.
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</p>
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<p>
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<span class="bold"><strong>Boost.Intrusive</strong></span> splay associative containers
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don't use their own hook types but plain Binary search tree hooks. See <a class="link" href="bst_hooks.html" title="Binary search tree hooks: bs_set_base_hook and bs_set_member_hook">Binary search tree hooks: bs_set_base_hook
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and bs_set_member_hook</a> section for more information about these hooks.
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</p>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="intrusive.splay_set_multiset.set_multiset_containers"></a><a class="link" href="splay_set_multiset.html#intrusive.splay_set_multiset.set_multiset_containers" title="splay_set, splay_multiset and splaytree containers">splay_set,
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splay_multiset and splaytree containers</a>
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</h3></div></div></div>
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<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="special">...</span><span class="identifier">Options</span><span class="special">></span>
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<span class="keyword">class</span> <span class="identifier">splay_set</span><span class="special">;</span>
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="special">...</span><span class="identifier">Options</span><span class="special">></span>
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<span class="keyword">class</span> <span class="identifier">splay_multiset</span><span class="special">;</span>
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="special">...</span><span class="identifier">Options</span><span class="special">></span>
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<span class="keyword">class</span> <span class="identifier">splaytree</span><span class="special">;</span>
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</pre>
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<p>
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These containers receive the same options explained in the section <a class="link" href="usage.html" title="How to use Boost.Intrusive">How to use Boost.Intrusive</a>:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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<span class="bold"><strong><code class="computeroutput"><span class="identifier">base_hook</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Hook</span><span class="special">></span></code></strong></span>
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/ <span class="bold"><strong><code class="computeroutput"><span class="identifier">member_hook</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Hook</span><span class="special">,</span> <span class="identifier">Hook</span> <span class="identifier">T</span><span class="special">::*</span> <span class="identifier">PtrToMember</span><span class="special">></span></code></strong></span>
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/ <span class="bold"><strong><code class="computeroutput"><span class="identifier">value_traits</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">ValueTraits</span><span class="special">></span></code></strong></span>:
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To specify the hook type or value traits used to configure the container.
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(To learn about value traits go to the section <a class="link" href="value_traits.html" title="Containers with custom ValueTraits">Containers
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with custom ValueTraits</a>.)
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</li>
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<li class="listitem">
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<span class="bold"><strong><code class="computeroutput"><span class="identifier">constant_time_size</span><span class="special"><</span><span class="keyword">bool</span> <span class="identifier">Enabled</span><span class="special">></span></code></strong></span>:
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To activate the constant-time <code class="computeroutput"><span class="identifier">size</span><span class="special">()</span></code> operation. Default: <code class="computeroutput"><span class="identifier">constant_time_size</span><span class="special"><</span><span class="keyword">true</span><span class="special">></span></code>
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</li>
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<li class="listitem">
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<span class="bold"><strong><code class="computeroutput"><span class="identifier">size_type</span><span class="special"><</span><span class="keyword">typename</span>
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<span class="identifier">SizeType</span><span class="special">></span></code></strong></span>:
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To specify the type that will be used to store the size of the container.
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Default: <code class="computeroutput"><span class="identifier">size_type</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">></span></code>
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</li>
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</ul></div>
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<p>
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And they also can receive an additional option:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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<span class="bold"><strong><code class="computeroutput"><span class="identifier">compare</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Compare</span><span class="special">></span></code></strong></span>:
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Comparison function for the objects to be inserted in containers. The
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comparison functor must induce a strict weak ordering. Default: <code class="computeroutput"><span class="identifier">compare</span><span class="special"><</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special"><</span><span class="identifier">key_type</span><span class="special">></span>
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<span class="special">></span></code>
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</li>
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<li class="listitem">
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<span class="bold"><strong><code class="computeroutput"><span class="identifier">key_of_value</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">KeyOfValueFunctionObject</span><span class="special">></span></code></strong></span>:
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A function object that will define the <code class="computeroutput"><span class="identifier">key_type</span></code>
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of the value type to be stored. This type will allow a map-like interface.
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See <a class="link" href="map_multimap.html" title="Map and multimap-like interface for associative containers">Map and multimap-like interface
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with set and multiset</a> for details. Default: <code class="computeroutput"><span class="identifier">key_type</span></code>
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is equal to <code class="computeroutput"><span class="identifier">value_type</span></code>
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(set-like interface).
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</li>
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</ul></div>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="intrusive.splay_set_multiset.splay_set_multiset_example"></a><a class="link" href="splay_set_multiset.html#intrusive.splay_set_multiset.splay_set_multiset_example" title="Example">Example</a>
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</h3></div></div></div>
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<p>
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Now let's see a small example using <code class="computeroutput"><a class="link" href="../boost/intrusive/splay_set.html" title="Class template splay_set">splay_set</a></code>/
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<code class="computeroutput"><a class="link" href="../boost/intrusive/splay_multiset.html" title="Class template splay_multiset">splay_multiset</a></code>
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containers:
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</p>
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<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">splay_set</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">functional</span><span class="special">></span>
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<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">intrusive</span><span class="special">;</span>
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<span class="keyword">class</span> <span class="identifier">mytag</span><span class="special">;</span>
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<span class="keyword">class</span> <span class="identifier">MyClass</span>
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<span class="special">:</span> <span class="keyword">public</span> <span class="identifier">bs_set_base_hook</span><span class="special"><></span>
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<span class="special">{</span>
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<span class="keyword">int</span> <span class="identifier">int_</span><span class="special">;</span>
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<span class="keyword">public</span><span class="special">:</span>
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<span class="comment">//This is a member hook</span>
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<span class="identifier">bs_set_member_hook</span><span class="special"><></span> <span class="identifier">member_hook_</span><span class="special">;</span>
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<span class="identifier">MyClass</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span><span class="special">)</span>
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<span class="special">:</span> <span class="identifier">int_</span><span class="special">(</span><span class="identifier">i</span><span class="special">)</span>
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<span class="special">{}</span>
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<span class="keyword">friend</span> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special"><</span> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">MyClass</span> <span class="special">&</span><span class="identifier">a</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">MyClass</span> <span class="special">&</span><span class="identifier">b</span><span class="special">)</span>
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<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>
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<span class="keyword">friend</span> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">></span> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">MyClass</span> <span class="special">&</span><span class="identifier">a</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">MyClass</span> <span class="special">&</span><span class="identifier">b</span><span class="special">)</span>
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<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>
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<span class="keyword">friend</span> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==</span> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">MyClass</span> <span class="special">&</span><span class="identifier">a</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">MyClass</span> <span class="special">&</span><span class="identifier">b</span><span class="special">)</span>
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||
<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>
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<span class="special">};</span>
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<span class="comment">//Define a set using the base hook that will store values in reverse order</span>
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||
<span class="keyword">typedef</span> <span class="identifier">splay_set</span><span class="special"><</span> <span class="identifier">MyClass</span><span class="special">,</span> <span class="identifier">compare</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">greater</span><span class="special"><</span><span class="identifier">MyClass</span><span class="special">></span> <span class="special">></span> <span class="special">></span> <span class="identifier">BaseSplaySet</span><span class="special">;</span>
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<span class="comment">//Define an multiset using the member hook</span>
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<span class="keyword">typedef</span> <span class="identifier">member_hook</span><span class="special"><</span><span class="identifier">MyClass</span><span class="special">,</span> <span class="identifier">bs_set_member_hook</span><span class="special"><>,</span> <span class="special">&</span><span class="identifier">MyClass</span><span class="special">::</span><span class="identifier">member_hook_</span><span class="special">></span> <span class="identifier">MemberOption</span><span class="special">;</span>
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||
<span class="keyword">typedef</span> <span class="identifier">splay_multiset</span><span class="special"><</span> <span class="identifier">MyClass</span><span class="special">,</span> <span class="identifier">MemberOption</span><span class="special">></span> <span class="identifier">MemberSplayMultiset</span><span class="special">;</span>
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<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
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||
<span class="special">{</span>
|
||
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">MyClass</span><span class="special">>::</span><span class="identifier">iterator</span> <span class="identifier">VectIt</span><span class="special">;</span>
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<span class="comment">//Create several MyClass objects, each one with a different value</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">MyClass</span><span class="special">></span> <span class="identifier">values</span><span class="special">;</span>
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<span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="number">100</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="identifier">values</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">MyClass</span><span class="special">(</span><span class="identifier">i</span><span class="special">));</span>
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<span class="identifier">BaseSplaySet</span> <span class="identifier">baseset</span><span class="special">;</span>
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<span class="identifier">MemberSplayMultiset</span> <span class="identifier">membermultiset</span><span class="special">;</span>
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<span class="comment">//Insert values in the container</span>
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<span class="keyword">for</span><span class="special">(</span><span class="identifier">VectIt</span> <span class="identifier">it</span><span class="special">(</span><span class="identifier">values</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()),</span> <span class="identifier">itend</span><span class="special">(</span><span class="identifier">values</span><span class="special">.</span><span class="identifier">end</span><span class="special">());</span> <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">itend</span><span class="special">;</span> <span class="special">++</span><span class="identifier">it</span><span class="special">){</span>
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||
<span class="identifier">baseset</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(*</span><span class="identifier">it</span><span class="special">);</span>
|
||
<span class="identifier">membermultiset</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(*</span><span class="identifier">it</span><span class="special">);</span>
|
||
<span class="special">}</span>
|
||
|
||
<span class="comment">//Now test sets</span>
|
||
<span class="special">{</span>
|
||
<span class="identifier">BaseSplaySet</span><span class="special">::</span><span class="identifier">reverse_iterator</span> <span class="identifier">rbit</span><span class="special">(</span><span class="identifier">baseset</span><span class="special">.</span><span class="identifier">rbegin</span><span class="special">());</span>
|
||
<span class="identifier">MemberSplayMultiset</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">mit</span><span class="special">(</span><span class="identifier">membermultiset</span><span class="special">.</span><span class="identifier">begin</span><span class="special">());</span>
|
||
<span class="identifier">VectIt</span> <span class="identifier">it</span><span class="special">(</span><span class="identifier">values</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()),</span> <span class="identifier">itend</span><span class="special">(</span><span class="identifier">values</span><span class="special">.</span><span class="identifier">end</span><span class="special">());</span>
|
||
|
||
<span class="comment">//Test the objects inserted in the base hook set</span>
|
||
<span class="keyword">for</span><span class="special">(;</span> <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">itend</span><span class="special">;</span> <span class="special">++</span><span class="identifier">it</span><span class="special">,</span> <span class="special">++</span><span class="identifier">rbit</span><span class="special">){</span>
|
||
<span class="keyword">if</span><span class="special">(&*</span><span class="identifier">rbit</span> <span class="special">!=</span> <span class="special">&*</span><span class="identifier">it</span><span class="special">)</span> <span class="keyword">return</span> <span class="number">1</span><span class="special">;</span>
|
||
<span class="special">}</span>
|
||
|
||
<span class="comment">//Test the objects inserted in member and binary search hook sets</span>
|
||
<span class="keyword">for</span><span class="special">(</span><span class="identifier">it</span> <span class="special">=</span> <span class="identifier">values</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">itend</span><span class="special">;</span> <span class="special">++</span><span class="identifier">it</span><span class="special">,</span> <span class="special">++</span><span class="identifier">mit</span><span class="special">){</span>
|
||
<span class="keyword">if</span><span class="special">(&*</span><span class="identifier">mit</span> <span class="special">!=</span> <span class="special">&*</span><span class="identifier">it</span><span class="special">)</span> <span class="keyword">return</span> <span class="number">1</span><span class="special">;</span>
|
||
<span class="special">}</span>
|
||
<span class="special">}</span>
|
||
<span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
|
||
<span class="special">}</span>
|
||
</pre>
|
||
</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<br>Copyright © 2006-2015 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>
|
||
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