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<article class="content wrap" id="_content" data-uid="Lucene.Net.Util.SentinelInt32Set">
<h1 id="Lucene_Net_Util_SentinelInt32Set" data-uid="Lucene.Net.Util.SentinelInt32Set" class="text-break">Class SentinelInt32Set
</h1>
<div class="markdown level0 summary"><p>A native <span class="xref">System.Int32</span> hash-based set where one value is reserved to mean &quot;EMPTY&quot; internally. The space overhead is fairly low
as there is only one power-of-two sized <span class="xref">int[]</span> to hold the values. The set is re-hashed when adding a value that
would make it &gt;= 75% full. Consider extending and over-riding <a class="xref" href="Lucene.Net.Util.SentinelInt32Set.html#Lucene_Net_Util_SentinelInt32Set_Hash_System_Int32_">Hash(Int32)</a> if the values might be poor
hash keys; Lucene docids should be fine.
The internal fields are exposed publicly to enable more efficient use at the expense of better O-O principles.
<p>
To iterate over the integers held in this set, simply use code like this:</p>
<pre><code>SentinelIntSet set = ...
foreach (int v in set.keys)
{
if (v == set.EmptyVal)
continue;
//use v...
}</code></pre>
<p><p>
NOTE: This was SentinelIntSet in Lucene
<p>
<div class="lucene-block lucene-internal">This is a Lucene.NET INTERNAL API, use at your own risk</div></div>
<div class="markdown level0 conceptual"></div>
<div class="inheritance">
<h5>Inheritance</h5>
<div class="level0"><span class="xref">System.Object</span></div>
<div class="level1"><span class="xref">SentinelInt32Set</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<span class="xref">System.Object.Equals(System.Object)</span>
</div>
<div>
<span class="xref">System.Object.Equals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.GetHashCode()</span>
</div>
<div>
<span class="xref">System.Object.GetType()</span>
</div>
<div>
<span class="xref">System.Object.MemberwiseClone()</span>
</div>
<div>
<span class="xref">System.Object.ReferenceEquals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.ToString()</span>
</div>
</div>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Util.html">Lucene.Net.Util</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.dll</h6>
<h5 id="Lucene_Net_Util_SentinelInt32Set_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public class SentinelInt32Set</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
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<a id="Lucene_Net_Util_SentinelInt32Set__ctor_" data-uid="Lucene.Net.Util.SentinelInt32Set.#ctor*"></a>
<h4 id="Lucene_Net_Util_SentinelInt32Set__ctor_System_Int32_System_Int32_" data-uid="Lucene.Net.Util.SentinelInt32Set.#ctor(System.Int32,System.Int32)">SentinelInt32Set(Int32, Int32)</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public SentinelInt32Set(int size, int emptyVal)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">size</span></td>
<td><p>The minimum number of elements this set should be able to hold without rehashing
(i.e. the slots are guaranteed not to change). </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">emptyVal</span></td>
<td><p>The integer value to use for EMPTY. </p>
</td>
</tr>
</tbody>
</table>
<h3 id="properties">Properties
</h3>
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<h4 id="Lucene_Net_Util_SentinelInt32Set_Count" data-uid="Lucene.Net.Util.SentinelInt32Set.Count">Count</h4>
<div class="markdown level1 summary"><p>The number of integers in this set. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public int Count { get; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Util_SentinelInt32Set_EmptyVal_" data-uid="Lucene.Net.Util.SentinelInt32Set.EmptyVal*"></a>
<h4 id="Lucene_Net_Util_SentinelInt32Set_EmptyVal" data-uid="Lucene.Net.Util.SentinelInt32Set.EmptyVal">EmptyVal</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public int EmptyVal { get; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Util_SentinelInt32Set_Keys" data-uid="Lucene.Net.Util.SentinelInt32Set.Keys">Keys</h4>
<div class="markdown level1 summary"><p>A power-of-2 over-sized array holding the integers in the set along with empty values. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public int[] Keys { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span>[]</td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Util_SentinelInt32Set_RehashCount" data-uid="Lucene.Net.Util.SentinelInt32Set.RehashCount">RehashCount</h4>
<div class="markdown level1 summary"><p>The count at which a rehash should be done. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public int RehashCount { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
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<h4 id="Lucene_Net_Util_SentinelInt32Set_Clear" data-uid="Lucene.Net.Util.SentinelInt32Set.Clear">Clear()</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual void Clear()</code></pre>
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<h4 id="Lucene_Net_Util_SentinelInt32Set_Exists_System_Int32_" data-uid="Lucene.Net.Util.SentinelInt32Set.Exists(System.Int32)">Exists(Int32)</h4>
<div class="markdown level1 summary"><p>Does this set contain the specified integer? </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual bool Exists(int key)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">key</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Util_SentinelInt32Set_Find_System_Int32_" data-uid="Lucene.Net.Util.SentinelInt32Set.Find(System.Int32)">Find(Int32)</h4>
<div class="markdown level1 summary"><p>(internal) Returns the slot for this key, or -slot-1 if not found. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual int Find(int key)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">key</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Util_SentinelInt32Set_GetSlot_System_Int32_" data-uid="Lucene.Net.Util.SentinelInt32Set.GetSlot(System.Int32)">GetSlot(Int32)</h4>
<div class="markdown level1 summary"><p>(internal) Returns the slot for this key. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual int GetSlot(int key)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">key</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
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<a id="Lucene_Net_Util_SentinelInt32Set_Hash_" data-uid="Lucene.Net.Util.SentinelInt32Set.Hash*"></a>
<h4 id="Lucene_Net_Util_SentinelInt32Set_Hash_System_Int32_" data-uid="Lucene.Net.Util.SentinelInt32Set.Hash(System.Int32)">Hash(Int32)</h4>
<div class="markdown level1 summary"><p>(internal) Return the hash for the key. The default implementation just returns the key,
which is not appropriate for general purpose use.</p>
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<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual int Hash(int key)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
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<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
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<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">key</span></td>
<td></td>
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<h5 class="returns">Returns</h5>
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<thead>
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<th>Type</th>
<th>Description</th>
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</thead>
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<td><span class="xref">System.Int32</span></td>
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<h4 id="Lucene_Net_Util_SentinelInt32Set_Put_System_Int32_" data-uid="Lucene.Net.Util.SentinelInt32Set.Put(System.Int32)">Put(Int32)</h4>
<div class="markdown level1 summary"><p>Puts this integer (key) in the set, and returns the slot index it was added to.
It rehashes if adding it would make the set more than 75% full.</p>
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<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual int Put(int key)</code></pre>
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<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
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<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
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<tbody>
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<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">key</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
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<td><span class="xref">System.Int32</span></td>
<td></td>
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<h4 id="Lucene_Net_Util_SentinelInt32Set_Rehash" data-uid="Lucene.Net.Util.SentinelInt32Set.Rehash">Rehash()</h4>
<div class="markdown level1 summary"><p>(internal) Rehashes by doubling key (<span class="xref">int[]</span>) and filling with the old values. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual void Rehash()</code></pre>
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