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<a href="#cogl-2.0-experimental-The-Object-Interface.description" class="shortcut">Description</a>
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<h2><span class="refentrytitle"><a name="cogl-2.0-experimental-The-Object-Interface.top_of_page"></a>The Object Interface</span></h2>
<p>The Object Interface</p>
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<div class="refsynopsisdiv">
<a name="cogl-2.0-experimental-The-Object-Interface.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"> <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject">CoglObject</a>;
<span class="returnvalue">void</span> * <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#cogl-object-ref" title="cogl_object_ref ()">cogl_object_ref</a> (<em class="parameter"><code><span class="type">void</span> *object</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#cogl-object-unref" title="cogl_object_unref ()">cogl_object_unref</a> (<em class="parameter"><code><span class="type">void</span> *object</code></em>);
<span class="returnvalue">void</span> * <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#cogl-object-get-user-data" title="cogl_object_get_user_data ()">cogl_object_get_user_data</a> (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a> *object</code></em>,
<em class="parameter"><code><span class="type">CoglUserDataKey</span> *key</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#cogl-object-set-user-data" title="cogl_object_set_user_data ()">cogl_object_set_user_data</a> (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a> *object</code></em>,
<em class="parameter"><code><span class="type">CoglUserDataKey</span> *key</code></em>,
<em class="parameter"><code><span class="type">void</span> *user_data</code></em>,
<em class="parameter"><code><span class="type">CoglUserDataDestroyCallback</span> destroy</code></em>);
</pre>
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<div class="refsect1">
<a name="cogl-2.0-experimental-The-Object-Interface.description"></a><h2>Description</h2>
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<a name="cogl-2.0-experimental-The-Object-Interface.details"></a><h2>Details</h2>
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<a name="CoglObject"></a><h3>CoglObject</h3>
<pre class="programlisting">typedef struct _CoglObject CoglObject;</pre>
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<div class="refsect2">
<a name="cogl-object-ref"></a><h3>cogl_object_ref ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> * cogl_object_ref (<em class="parameter"><code><span class="type">void</span> *object</code></em>);</pre>
<p>
Increases the reference count of <em class="parameter"><code>handle</code></em> by 1
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<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>a <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a>
</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <em class="parameter"><code>object</code></em>, with its reference count increased</td>
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<a name="cogl-object-unref"></a><h3>cogl_object_unref ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_object_unref (<em class="parameter"><code><span class="type">void</span> *object</code></em>);</pre>
<p>
Drecreases the reference count of <em class="parameter"><code>object</code></em> by 1; if the reference
count reaches 0, the resources allocated by <em class="parameter"><code>object</code></em> will be freed
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<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>a <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a>
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<div class="refsect2">
<a name="cogl-object-get-user-data"></a><h3>cogl_object_get_user_data ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> * cogl_object_get_user_data (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a> *object</code></em>,
<em class="parameter"><code><span class="type">CoglUserDataKey</span> *key</code></em>);</pre>
<p>
Finds the user data previously associated with <em class="parameter"><code>object</code></em> using
the given <em class="parameter"><code>key</code></em>. If no user data has been associated with <em class="parameter"><code>object</code></em>
for the given <em class="parameter"><code>key</code></em> this function returns NULL.
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<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>The object with associated private data to query</td>
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<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>The address of a <span class="type">CoglUserDataKey</span> which provides a unique value
with which to index the private data.</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The user data previously associated
with <em class="parameter"><code>object</code></em> using the given <em class="parameter"><code>key</code></em>; or <code class="literal">NULL</code> if no associated
data is found. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
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<p class="since">Since 1.4</p>
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<hr>
<div class="refsect2">
<a name="cogl-object-set-user-data"></a><h3>cogl_object_set_user_data ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_object_set_user_data (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a> *object</code></em>,
<em class="parameter"><code><span class="type">CoglUserDataKey</span> *key</code></em>,
<em class="parameter"><code><span class="type">void</span> *user_data</code></em>,
<em class="parameter"><code><span class="type">CoglUserDataDestroyCallback</span> destroy</code></em>);</pre>
<p>
Associates some private <em class="parameter"><code>user_data</code></em> with a given <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a>. To
later remove the association call <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#cogl-object-set-user-data" title="cogl_object_set_user_data ()"><code class="function">cogl_object_set_user_data()</code></a> with
the same <em class="parameter"><code>key</code></em> but NULL for the <em class="parameter"><code>user_data</code></em>.
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<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>The object to associate private data with</td>
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<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>The address of a <span class="type">CoglUserDataKey</span> which provides a unique value
with which to index the private data.</td>
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<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>The data to associate with the given object,
or <code class="literal">NULL</code> to remove a previous association.</td>
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<td><p><span class="term"><em class="parameter"><code>destroy</code></em> :</span></p></td>
<td>A <span class="type">CoglUserDataDestroyCallback</span> to call if the object is
destroyed or if the association is removed by later setting
<code class="literal">NULL</code> data for the same key.</td>
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</tbody>
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<p class="since">Since 1.4</p>
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