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<h1>sigc::trackable Struct Reference<br/>
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[<a class="el" href="group__signal.html">Signals</a>]</small>
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<p>Base class for objects with auto-disconnection. <a href="#_details">More...</a></p>
<p><code>#include <sigc++/trackable.h></code></p>
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Inheritance diagram for sigc::trackable:<!-- endSectionHeader --></div>
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<p><a href="structsigc_1_1trackable-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3338954d7565534bd945290b798e13ed"></a><!-- doxytag: member="sigc::trackable::func_destroy_notify" ref="a3338954d7565534bd945290b798e13ed" args="" -->
typedef <br class="typebreak"/>
internal::func_destroy_notify </td><td class="memItemRight" valign="bottom"><b>func_destroy_notify</b></td></tr>
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a7efefbcab4645648a366da3439242198"></a><!-- doxytag: member="sigc::trackable::trackable" ref="a7efefbcab4645648a366da3439242198" args="(const trackable &src)" -->
 </td><td class="memItemRight" valign="bottom"><b>trackable</b> (const <a class="el" href="structsigc_1_1trackable.html">trackable</a>& src)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a7494fbad23a65932ff1457d00d4edaf5"></a><!-- doxytag: member="sigc::trackable::operator=" ref="a7494fbad23a65932ff1457d00d4edaf5" args="(const trackable &src)" -->
<a class="el" href="structsigc_1_1trackable.html">trackable</a>& </td><td class="memItemRight" valign="bottom"><b>operator=</b> (const <a class="el" href="structsigc_1_1trackable.html">trackable</a>& src)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1trackable.html#ab14931670837728e49bb5ca88fb16db5">add_destroy_notify_callback</a> (void* data, func_destroy_notify func) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Add a callback that is executed (notified) when the trackable object is detroyed. <a href="#ab14931670837728e49bb5ca88fb16db5"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1trackable.html#a8b9dffa8a50ff13ba33e6c7f10468e2b">remove_destroy_notify_callback</a> (void* data) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Remove a callback previously installed with <a class="el" href="structsigc_1_1trackable.html#ab14931670837728e49bb5ca88fb16db5" title="Add a callback that is executed (notified) when the trackable object is detroyed.">add_destroy_notify_callback()</a>. <a href="#a8b9dffa8a50ff13ba33e6c7f10468e2b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="af2e23cfe7adc1ca844a3350bbac557cb"></a><!-- doxytag: member="sigc::trackable::notify_callbacks" ref="af2e23cfe7adc1ca844a3350bbac557cb" args="()" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1trackable.html#af2e23cfe7adc1ca844a3350bbac557cb">notify_callbacks</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Execute and remove all previously installed callbacks. <br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>Base class for objects with auto-disconnection. </p>
<p>trackable must be inherited when objects shall automatically invalidate slots referring to them on destruction. A slot built from a member function of a trackable derived type installs a callback that is invoked when the trackable object is destroyed or overwritten.</p>
<p><a class="el" href="structsigc_1_1trackable.html#ab14931670837728e49bb5ca88fb16db5" title="Add a callback that is executed (notified) when the trackable object is detroyed.">add_destroy_notify_callback()</a> and <a class="el" href="structsigc_1_1trackable.html#a8b9dffa8a50ff13ba33e6c7f10468e2b" title="Remove a callback previously installed with add_destroy_notify_callback().">remove_destroy_notify_callback()</a> can be used to manually install and remove callbacks when notification of the object dying is needed.</p>
<p><a class="el" href="structsigc_1_1trackable.html#af2e23cfe7adc1ca844a3350bbac557cb" title="Execute and remove all previously installed callbacks.">notify_callbacks()</a> invokes and removes all previously installed callbacks and can therefore be used to disconnect from all signals.</p>
<p>Note that there is no virtual destructor. Don't use <code>trackable*</code> as pointer type for managing your data or the destructors of your derived types won't be called when deleting your objects. </p>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="ab14931670837728e49bb5ca88fb16db5"></a><!-- doxytag: member="sigc::trackable::add_destroy_notify_callback" ref="ab14931670837728e49bb5ca88fb16db5" args="(void *data, func_destroy_notify func) const " -->
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">void sigc::trackable::add_destroy_notify_callback </td>
<td>(</td>
<td class="paramtype">void * </td>
<td class="paramname"> <em>data</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">func_destroy_notify </td>
<td class="paramname"> <em>func</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Add a callback that is executed (notified) when the trackable object is detroyed. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">data</td><td>Passed into func upon notification. </td></tr>
<tr><td class="paramname">func</td><td>Callback executed upon destruction of the object. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a8b9dffa8a50ff13ba33e6c7f10468e2b"></a><!-- doxytag: member="sigc::trackable::remove_destroy_notify_callback" ref="a8b9dffa8a50ff13ba33e6c7f10468e2b" args="(void *data) const " -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void sigc::trackable::remove_destroy_notify_callback </td>
<td>(</td>
<td class="paramtype">void * </td>
<td class="paramname"> <em>data</em> )</td>
<td> const</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Remove a callback previously installed with <a class="el" href="structsigc_1_1trackable.html#ab14931670837728e49bb5ca88fb16db5" title="Add a callback that is executed (notified) when the trackable object is detroyed.">add_destroy_notify_callback()</a>. </p>
<p>The callback is not executed. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">data</td><td>Parameter passed into previous call to <a class="el" href="structsigc_1_1trackable.html#ab14931670837728e49bb5ca88fb16db5" title="Add a callback that is executed (notified) when the trackable object is detroyed.">add_destroy_notify_callback()</a>. </td></tr>
</table>
</dd>
</dl>
</div>
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