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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>The Object Interface: Cogl 2.0 Reference Manual</title>
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                  <a href="#cogl-2.0-experimental-The-Object-Interface.description" class="shortcut">Description</a></span>
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<div class="refentry">
<a name="cogl-2.0-experimental-The-Object-Interface"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<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>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="cogl-2.0-experimental-The-Object-Interface.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">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#cogl-object-ref" title="cogl_object_ref ()">cogl_object_ref</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#cogl-object-unref" title="cogl_object_unref ()">cogl_object_unref</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-The-Object-Interface.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"> </td>
<td class="function_name"><a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject">CoglObject</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglUserDataKey" title="CoglUserDataKey">CoglUserDataKey</a></td>
</tr>
<tr>
<td class="typedef_keyword">typedef</td>
<td class="function_name"><a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglUserDataDestroyCallback" title="CoglUserDataDestroyCallback">CoglUserDataDestroyCallback</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-The-Object-Interface.description"></a><h2>Description</h2>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-The-Object-Interface.functions_details"></a><h2>Functions</h2>
<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>object</code></em>
 by 1</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="cogl-object-ref.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>object</p></td>
<td class="parameter_description"><p>a <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-object-ref.returns"></a><h4>Returns</h4>
<p> the <em class="parameter"><code>object</code></em>
, with its reference count increased</p>
</div>
</div>
<hr>
<div class="refsect2">
<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</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="cogl-object-unref.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>object</p></td>
<td class="parameter_description"><p>a <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<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><a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglUserDataKey" title="CoglUserDataKey"><span class="type">CoglUserDataKey</span></a> *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.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="cogl-object-get-user-data.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>object</p></td>
<td class="parameter_description"><p>The object with associated private data to query</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>The address of a <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglUserDataKey" title="CoglUserDataKey"><span class="type">CoglUserDataKey</span></a> which provides a unique value
with which to index the private data.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-object-get-user-data.returns"></a><h4>Returns</h4>
<p> 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. </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="ix06.html#api-index-1.4">1.4</a></p>
</div>
<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><a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglUserDataKey" title="CoglUserDataKey"><span class="type">CoglUserDataKey</span></a> *key</code></em>,
                           <em class="parameter"><code><span class="type">void</span> *user_data</code></em>,
                           <em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglUserDataDestroyCallback" title="CoglUserDataDestroyCallback"><span class="type">CoglUserDataDestroyCallback</span></a> 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>
.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="cogl-object-set-user-data.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>object</p></td>
<td class="parameter_description"><p>The object to associate private data with</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>The address of a <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglUserDataKey" title="CoglUserDataKey"><span class="type">CoglUserDataKey</span></a> which provides a unique value
with which to index the private data.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>The data to associate with the given object,
or <code class="literal">NULL</code> to remove a previous association.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>destroy</p></td>
<td class="parameter_description"><p>A <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglUserDataDestroyCallback" title="CoglUserDataDestroyCallback"><span class="type">CoglUserDataDestroyCallback</span></a> 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.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
</div>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-The-Object-Interface.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="CoglObject"></a><h3>CoglObject</h3>
<pre class="programlisting">typedef struct _CoglObject CoglObject;</pre>
<p>Ref Func: cogl_object_ref
Unref Func: cogl_object_unref
Set Value Func: cogl_object_value_set_object
Get Value Func: cogl_object_value_get_object</p>
</div>
<hr>
<div class="refsect2">
<a name="CoglUserDataKey"></a><h3>CoglUserDataKey</h3>
<pre class="programlisting">typedef struct {
  int unused;
} CoglUserDataKey;
</pre>
<p>A <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglUserDataKey" title="CoglUserDataKey"><span class="type">CoglUserDataKey</span></a> is used to declare a key for attaching data to a
<a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a> using cogl_object_set_user_data. The typedef only exists as a
formality to make code self documenting since only the unique address of a
<a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglUserDataKey" title="CoglUserDataKey"><span class="type">CoglUserDataKey</span></a> is used.</p>
<p>Typically you would declare a static <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglUserDataKey" title="CoglUserDataKey"><span class="type">CoglUserDataKey</span></a> and set private data
on an object something like this:</p>
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16</pre></td>
        <td class="listing_code"><pre class="programlisting"><span class="gtkdoc kwb">static</span> CoglUserDataKey path_private_key<span class="gtkdoc opt">;</span>

<span class="gtkdoc kwb">static void</span>
<span class="function">destroy_path_private_cb</span> <span class="gtkdoc opt">(</span><span class="gtkdoc kwb">void</span> <span class="gtkdoc opt">*</span>data<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
  <span class="function">g_free</span> <span class="gtkdoc opt">(</span>data<span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">}</span>

<span class="gtkdoc kwb">static void</span>
<span class="function">my_path_set_data</span> <span class="gtkdoc opt">(</span>CoglPath <span class="gtkdoc opt">*</span>path<span class="gtkdoc opt">,</span> <span class="gtkdoc kwb">void</span> <span class="gtkdoc opt">*</span>data<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
  <span class="function"><a href="cogl-2.0-experimental-The-Object-Interface.html#cogl-object-set-user-data">cogl_object_set_user_data</a></span> <span class="gtkdoc opt">(</span><span class="function">COGL_OBJECT</span> <span class="gtkdoc opt">(</span>path<span class="gtkdoc opt">),</span>
                             <span class="gtkdoc opt">&amp;</span>private_key<span class="gtkdoc opt">,</span>
                             data<span class="gtkdoc opt">,</span>
                             destroy_path_private_cb<span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">}</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p></p>
<div class="refsect3">
<a name="CoglUserDataKey.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody><tr>
<td class="struct_member_name"><p><span class="type">int</span> <em class="structfield"><code><a name="CoglUserDataKey.unused"></a>unused</code></em>;</p></td>
<td class="struct_member_description"><p>ignored.</p></td>
<td class="struct_member_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="CoglUserDataDestroyCallback"></a><h3>CoglUserDataDestroyCallback</h3>
<pre class="programlisting">typedef GDestroyNotify CoglUserDataDestroyCallback;
</pre>
<p>When associating private data with a <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a> a callback can be
given which will be called either if the object is destroyed or if
<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> is called with NULL user_data for the
same key.</p>
<p class="since">Since: <a class="link" href="ix06.html#api-index-1.4">1.4</a></p>
</div>
</div>
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