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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>EExtension: Evolution-Data-Server Reference Manual</title>
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<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#EExtension.description" class="shortcut">Description</a></span><span id="nav_hierarchy">  <span class="dim">|</span> 
                  <a href="#EExtension.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
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<div class="refentry">
<a name="EExtension"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="EExtension.top_of_page"></a>EExtension</span></h2>
<p>EExtension — An abstract base class for extensions</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="EExtension.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody><tr>
<td class="function_type">
<a class="link" href="EExtensible.html" title="EExtensible"><span class="returnvalue">EExtensible</span></a> *
</td>
<td class="function_name">
<a class="link" href="EExtension.html#e-extension-get-extensible" title="e_extension_get_extensible ()">e_extension_get_extensible</a> <span class="c_punctuation">()</span>
</td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="EExtension.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="EExtension.html#EExtension-struct" title="struct EExtension">EExtension</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="EExtension.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
    <span class="lineart">╰──</span> EExtension
        <span class="lineart">├──</span> <a class="link" href="EBackendFactory.html" title="EBackendFactory">EBackendFactory</a>
        <span class="lineart">├──</span> <a class="link" href="ESourceCredentialsProviderImpl.html" title="ESourceCredentialsProviderImpl">ESourceCredentialsProviderImpl</a>
        <span class="lineart">╰──</span> <a class="link" href="EUserPrompterServerExtension.html" title="EUserPrompterServerExtension">EUserPrompterServerExtension</a>
</pre>
</div>
<div class="refsect1">
<a name="EExtension.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;libedataserver/libedataserver.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="EExtension.description"></a><h2>Description</h2>
<p><a class="link" href="EExtension.html" title="EExtension"><span class="type">EExtension</span></a> provides a way to extend the functionality of objects
that implement the <a class="link" href="EExtensible.html" title="EExtensible"><span class="type">EExtensible</span></a> interface.  <a class="link" href="EExtension.html" title="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="EExtension.html" title="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="EExtension.html" title="EExtension"><span class="type">EExtension</span></a>.</p></li>
<li class="listitem"><p>In the class initialization function, specify the <a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"><span class="type">GType</span></a> being
extended.  The <a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"><span class="type">GType</span></a> must implement the <a class="link" href="EExtensible.html" title="EExtensible"><span class="type">EExtensible</span></a> interface.</p></li>
<li class="listitem"><p>Register the extension's own <a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"><span class="type">GType</span></a>.  If the extension is to
be loaded dynamically using <a href="/usr/share/gtk-doc/html/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>
</div>
<div class="refsect1">
<a name="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"><a class="link" href="EExtensible.html" title="EExtensible"><span class="returnvalue">EExtensible</span></a> *
e_extension_get_extensible (<em class="parameter"><code><a class="link" href="EExtension.html" title="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>
<div class="refsect3">
<a name="e-extension-get-extensible.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>extension</p></td>
<td class="parameter_description"><p>an <a class="link" href="EExtension.html" title="EExtension"><span class="type">EExtension</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<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>
</div>
<p class="since">Since: <a class="link" href="api-index-3.4.html" title="Index of new symbols in 3.4">3.4</a></p>
</div>
</div>
<div class="refsect1">
<a name="EExtension.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="EExtension-struct"></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" title="Index of new symbols in 3.4">3.4</a></p>
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