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<h2><span class="refentrytitle"><a name="evolution-data-server-EExtension.top_of_page"></a>EExtension</span></h2>
<p>EExtension — An abstract base class for extensions</p>
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<a name="evolution-data-server-EExtension.functions"></a><h2>Functions</h2>
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<td class="function_type">
<span class="returnvalue">EExtensible</span> *
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<td class="function_name">
<a class="link" href="evolution-data-server-EExtension.html#e-extension-get-extensible" title="e_extension_get_extensible ()">e_extension_get_extensible</a> <span class="c_punctuation">()</span>
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<a name="evolution-data-server-EExtension.other"></a><h2>Types and Values</h2>
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<col width="150px" class="name">
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<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="evolution-data-server-EExtension.html#EExtension" title="struct EExtension">EExtension</a></td>
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<a name="evolution-data-server-EExtension.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <libedataserver/libedataserver.h>
</pre>
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<a name="evolution-data-server-EExtension.description"></a><h2>Description</h2>
<p><a class="link" href="evolution-data-server-EExtension.html#EExtension" title="struct EExtension"><span class="type">EExtension</span></a> provides a way to extend the functionality of objects
that implement the <span class="type">EExtensible</span> interface. <a class="link" href="evolution-data-server-EExtension.html#EExtension" title="struct EExtension"><span class="type">EExtension</span></a> subclasses
can target a particular extensible object type. New instances of
an extensible object type get paired with a new instance of each
<a class="link" href="evolution-data-server-EExtension.html#EExtension" title="struct EExtension"><span class="type">EExtension</span></a> subclass that targets the extensible object type.</p>
<p>The first steps of writing a new extension are as follows:</p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><p>Subclass <a class="link" href="evolution-data-server-EExtension.html#EExtension" title="struct EExtension"><span class="type">EExtension</span></a>.</p></li>
<li class="listitem"><p>In the class initialization function, specify the <a href="../gobject/gobject-Type-Information.html#GType"><span class="type">GType</span></a> being
extended. The <a href="../gobject/gobject-Type-Information.html#GType"><span class="type">GType</span></a> must implement the <span class="type">EExtensible</span> interface.</p></li>
<li class="listitem"><p>Register the extension's own <a href="../gobject/gobject-Type-Information.html#GType"><span class="type">GType</span></a>. If the extension is to
be loaded dynamically using <a href="../gobject/GTypeModule.html#GTypeModule-struct"><span class="type">GTypeModule</span></a>, the type should be
registered in the library module's <code class="function">e_module_load()</code> function.</p></li>
</ol></div>
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<div class="refsect1">
<a name="evolution-data-server-EExtension.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="e-extension-get-extensible"></a><h3>e_extension_get_extensible ()</h3>
<pre class="programlisting"><span class="returnvalue">EExtensible</span> *
e_extension_get_extensible (<em class="parameter"><code><a class="link" href="evolution-data-server-EExtension.html#EExtension" title="struct EExtension"><span class="type">EExtension</span></a> *extension</code></em>);</pre>
<p>Returns the object that <em class="parameter"><code>extension</code></em>
extends.</p>
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<a name="e-extension-get-extensible.parameters"></a><h4>Parameters</h4>
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<col width="150px" class="parameters_name">
<col class="parameters_description">
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<td class="parameter_name"><p>extension</p></td>
<td class="parameter_description"><p>an <a class="link" href="evolution-data-server-EExtension.html#EExtension" title="struct EExtension"><span class="type">EExtension</span></a></p></td>
<td class="parameter_annotations"> </td>
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<div class="refsect3">
<a name="e-extension-get-extensible.returns"></a><h4>Returns</h4>
<p>the object being extended. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
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<p class="since">Since: <a class="link" href="api-index-3-4.html#api-index-3.4">3.4</a></p>
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<div class="refsect1">
<a name="evolution-data-server-EExtension.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="EExtension"></a><h3>struct EExtension</h3>
<pre class="programlisting">struct EExtension {
};
</pre>
<p>Contains only private data that should be read and manipulated using the
functions below.</p>
<p class="since">Since: <a class="link" href="api-index-3-4.html#api-index-3.4">3.4</a></p>
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