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<article class="content wrap" id="_content" data-uid="Lucene.Net.Support.C5.IExtensible`1">
<h1 id="Lucene_Net_Support_C5_IExtensible_1" data-uid="Lucene.Net.Support.C5.IExtensible`1" class="text-break">Interface IExtensible&lt;T&gt;
</h1>
<div class="markdown level0 summary"><p>A generic collection to which one may add items. This is just the intersection
of the main stream generic collection interfaces and the priority queue interface,
<span class="xref">C5.ICollection`1</span> and <span class="xref">C5.IPriorityQueue`1</span>.</p>
</div>
<div class="markdown level0 conceptual"></div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_ListenableEvents">ICollectionValue&lt;T&gt;.ListenableEvents</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_ActiveEvents">ICollectionValue&lt;T&gt;.ActiveEvents</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_CollectionChanged">ICollectionValue&lt;T&gt;.CollectionChanged</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_CollectionCleared">ICollectionValue&lt;T&gt;.CollectionCleared</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_ItemsAdded">ICollectionValue&lt;T&gt;.ItemsAdded</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_ItemInserted">ICollectionValue&lt;T&gt;.ItemInserted</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_ItemsRemoved">ICollectionValue&lt;T&gt;.ItemsRemoved</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_ItemRemovedAt">ICollectionValue&lt;T&gt;.ItemRemovedAt</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_IsEmpty">ICollectionValue&lt;T&gt;.IsEmpty</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_Count">ICollectionValue&lt;T&gt;.Count</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_CountSpeed">ICollectionValue&lt;T&gt;.CountSpeed</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_CopyTo__0___System_Int32_">ICollectionValue&lt;T&gt;.CopyTo(T[], Int32)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_ToArray">ICollectionValue&lt;T&gt;.ToArray()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_Apply_System_Action__0__">ICollectionValue&lt;T&gt;.Apply(Action&lt;T&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_Exists_System_Func__0_System_Boolean__">ICollectionValue&lt;T&gt;.Exists(Func&lt;T, Boolean&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_Find_System_Func__0_System_Boolean___0__">ICollectionValue&lt;T&gt;.Find(Func&lt;T, Boolean&gt;, T)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_All_System_Func__0_System_Boolean__">ICollectionValue&lt;T&gt;.All(Func&lt;T, Boolean&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_Choose">ICollectionValue&lt;T&gt;.Choose()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.ICollectionValue-1.html#Lucene_Net_Support_C5_ICollectionValue_1_Filter_System_Func__0_System_Boolean__">ICollectionValue&lt;T&gt;.Filter(Func&lt;T, Boolean&gt;)</a>
</div>
<div>
<span class="xref">System.Collections.Generic.IEnumerable&lt;T&gt;.GetEnumerator()</span>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.C5.IShowable.html#Lucene_Net_Support_C5_IShowable_Show_System_Text_StringBuilder_System_Int32__System_IFormatProvider_">IShowable.Show(StringBuilder, Int32, IFormatProvider)</a>
</div>
<div>
<span class="xref">System.IFormattable.ToString(System.String, System.IFormatProvider)</span>
</div>
</div>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Support.C5.html">Lucene.Net.Support.C5</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.dll</h6>
<h5 id="Lucene_Net_Support_C5_IExtensible_1_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public interface IExtensible&lt;T&gt; : ICollectionValue&lt;T&gt;, IEnumerable&lt;T&gt;, IEnumerable, IShowable, IFormattable</code></pre>
</div>
<h5 class="typeParameters">Type Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="parametername">T</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="properties">Properties
</h3>
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<h4 id="Lucene_Net_Support_C5_IExtensible_1_AllowsDuplicates" data-uid="Lucene.Net.Support.C5.IExtensible`1.AllowsDuplicates">AllowsDuplicates</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">bool AllowsDuplicates { 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.Boolean</span></td>
<td><p>False if this collection has set semantics, true if bag semantics.</p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Support_C5_IExtensible_1_DuplicatesByCounting_" data-uid="Lucene.Net.Support.C5.IExtensible`1.DuplicatesByCounting*"></a>
<h4 id="Lucene_Net_Support_C5_IExtensible_1_DuplicatesByCounting" data-uid="Lucene.Net.Support.C5.IExtensible`1.DuplicatesByCounting">DuplicatesByCounting</h4>
<div class="markdown level1 summary"><p>By convention this is true for any collection with set semantics.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">bool DuplicatesByCounting { 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.Boolean</span></td>
<td><p>True if only one representative of a group of equal items
is kept in the collection together with the total count.</p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Support_C5_IExtensible_1_EqualityComparer_" data-uid="Lucene.Net.Support.C5.IExtensible`1.EqualityComparer*"></a>
<h4 id="Lucene_Net_Support_C5_IExtensible_1_EqualityComparer" data-uid="Lucene.Net.Support.C5.IExtensible`1.EqualityComparer">EqualityComparer</h4>
<div class="markdown level1 summary"><p>(Here should be a discussion of the role of equalityComparers. Any ). </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">IEqualityComparer&lt;T&gt; EqualityComparer { 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.Collections.Generic.IEqualityComparer</span>&lt;T&gt;</td>
<td><p>The equalityComparer used by this collection to check equality of items.
Or null (????) if collection does not check equality at all or uses a comparer.</p>
</td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Support_C5_IExtensible_1_IsReadOnly" data-uid="Lucene.Net.Support.C5.IExtensible`1.IsReadOnly">IsReadOnly</h4>
<div class="markdown level1 summary"><p>If true any call of an updating operation will throw an</p>
<pre><code>ReadOnlyCollectionException</code></pre>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">bool IsReadOnly { 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.Boolean</span></td>
<td><p>True if this collection is read-only.</p>
</td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
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<a id="Lucene_Net_Support_C5_IExtensible_1_Add_" data-uid="Lucene.Net.Support.C5.IExtensible`1.Add*"></a>
<h4 id="Lucene_Net_Support_C5_IExtensible_1_Add__0_" data-uid="Lucene.Net.Support.C5.IExtensible`1.Add(`0)">Add(T)</h4>
<div class="markdown level1 summary"><p>Add an item to this collection if possible. If this collection has set
semantics, the item will be added if not already in the collection. If
bag semantics, the item will always be added.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">bool Add(T item)</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">T</span></td>
<td><span class="parametername">item</span></td>
<td><p>The item to add.</p>
</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><p>True if item was added.</p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Support_C5_IExtensible_1_AddAll_" data-uid="Lucene.Net.Support.C5.IExtensible`1.AddAll*"></a>
<h4 id="Lucene_Net_Support_C5_IExtensible_1_AddAll_System_Collections_Generic_IEnumerable__0__" data-uid="Lucene.Net.Support.C5.IExtensible`1.AddAll(System.Collections.Generic.IEnumerable{`0})">AddAll(IEnumerable&lt;T&gt;)</h4>
<div class="markdown level1 summary"><p>Add the elements from another collection with a more specialized item type
to this collection. If this
collection has set semantics, only items not already in the collection
will be added.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">void AddAll(IEnumerable&lt;T&gt; items)</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.Collections.Generic.IEnumerable</span>&lt;T&gt;</td>
<td><span class="parametername">items</span></td>
<td><p>The items to add</p>
</td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Support_C5_IExtensible_1_Check" data-uid="Lucene.Net.Support.C5.IExtensible`1.Check">Check()</h4>
<div class="markdown level1 summary"><p>Check the integrity of the internal data structures of this collection.
<em>This is only relevant for developers of the library</em></p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">bool Check()</code></pre>
</div>
<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><p>True if check was passed.</p>
</td>
</tr>
</tbody>
</table>
<h3 id="extensionmethods">Extension Methods</h3>
<div>
<a class="xref" href="Lucene.Net.Support.EnumerableExtensions.html#Lucene_Net_Support_EnumerableExtensions_InPairs__2_System_Collections_Generic_IEnumerable___0__System_Func___0___0___1__">EnumerableExtensions.InPairs&lt;T, TOut&gt;(IEnumerable&lt;T&gt;, Func&lt;T, T, TOut&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.EnumerableExtensions.html#Lucene_Net_Support_EnumerableExtensions_TakeAllButLast__1_System_Collections_Generic_IEnumerable___0__">EnumerableExtensions.TakeAllButLast&lt;T&gt;(IEnumerable&lt;T&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Support.EnumerableExtensions.html#Lucene_Net_Support_EnumerableExtensions_TakeAllButLast__1_System_Collections_Generic_IEnumerable___0__System_Int32_">EnumerableExtensions.TakeAllButLast&lt;T&gt;(IEnumerable&lt;T&gt;, Int32)</a>
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