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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>libsigc++ 2.0: sigc::trackable Struct Reference</title>
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<h1>sigc::trackable Struct Reference<br>
<small>
[<a class="el" href="group__signal.html">Signals</a>]</small>
</h1>Base class for objects with auto-disconnection.
<a href="#_details">More...</a>
<p>
Inheritance diagram for sigc::trackable:<p><center><img src="structsigc_1_1trackable__inherit__graph.png" border="0" usemap="#sigc_1_1trackable__inherit__map" alt="Inheritance graph"></center>
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<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="structsigc_1_1trackable-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
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<tr><td colspan="2"><br><h2>Public Types</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef <a class="el" href="namespacesigc_1_1internal.html#a1">internal::func_destroy_notify</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1trackable.html#w0">func_destroy_notify</a></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1trackable.html#a0">trackable</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1trackable.html#a1">trackable</a> (const <a class="el" href="structsigc_1_1trackable.html">trackable</a>& src)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="structsigc_1_1trackable.html">trackable</a>& </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1trackable.html#a2">operator=</a> (const <a class="el" href="structsigc_1_1trackable.html">trackable</a>& src)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1trackable.html#a3">~trackable</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1trackable.html#a4">add_destroy_notify_callback</a> (void* data, <a class="el" href="structsigc_1_1trackable.html#w0">func_destroy_notify</a> 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="#a4"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1trackable.html#a5">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#a4">add_destroy_notify_callback()</a>. <a href="#a5"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1trackable.html#a6">notify_callbacks</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Execute and remove all previously installed callbacks. <a href="#a6"></a><br></td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
Base class for objects with auto-disconnection.
<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>
<a class="el" href="structsigc_1_1trackable.html#a4">add_destroy_notify_callback()</a> and <a class="el" href="structsigc_1_1trackable.html#a5">remove_destroy_notify_callback()</a> can be used to manually install and remove callbacks when notification of the object dying is needed.<p>
<a class="el" href="structsigc_1_1trackable.html#a6">notify_callbacks()</a> invokes and removes all previously installed callbacks and can therefore be used to disconnect from all signals.<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 Typedef Documentation</h2>
<a class="anchor" name="w0" doxytag="sigc::trackable::func_destroy_notify"></a><p>
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<td class="md" nowrap valign="top">typedef <a class="el" href="namespacesigc_1_1internal.html#a1">internal::func_destroy_notify</a> <a class="el" href="structsigc_1_1trackable.html#w0">sigc::trackable::func_destroy_notify</a> </td>
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<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="a0" doxytag="sigc::trackable::trackable"></a><p>
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<td class="md" nowrap valign="top">sigc::trackable::trackable </td>
<td class="md" valign="top">(</td>
<td class="mdname1" valign="top" nowrap> </td>
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<a class="anchor" name="a1" doxytag="sigc::trackable::trackable"></a><p>
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<td class="md" nowrap valign="top">sigc::trackable::trackable </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const <a class="el" href="structsigc_1_1trackable.html">trackable</a>& </td>
<td class="mdname1" valign="top" nowrap> <em>src</em> </td>
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<a class="anchor" name="a3" doxytag="sigc::trackable::~trackable"></a><p>
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<td class="md" nowrap valign="top">sigc::trackable::~<a class="el" href="structsigc_1_1trackable.html">trackable</a> </td>
<td class="md" valign="top">(</td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="a4" doxytag="sigc::trackable::add_destroy_notify_callback"></a><p>
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<td class="md" nowrap valign="top">void sigc::trackable::add_destroy_notify_callback </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">void* </td>
<td class="mdname" nowrap> <em>data</em>, </td>
</tr>
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<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap><a class="el" href="structsigc_1_1trackable.html#w0">func_destroy_notify</a> </td>
<td class="mdname" nowrap> <em>func</em></td>
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<td class="md"></td>
<td class="md">) </td>
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<p>
Add a callback that is executed (notified) when the trackable object is detroyed.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>data</em> </td><td>Passed into func upon notification. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>func</em> </td><td>Callback executed upon destruction of the object. </td></tr>
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<a class="anchor" name="a6" doxytag="sigc::trackable::notify_callbacks"></a><p>
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<td class="md" nowrap valign="top">void sigc::trackable::notify_callbacks </td>
<td class="md" valign="top">(</td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
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Execute and remove all previously installed callbacks.
<p>
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<a class="anchor" name="a2" doxytag="sigc::trackable::operator="></a><p>
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<td class="md" nowrap valign="top"><a class="el" href="structsigc_1_1trackable.html">trackable</a>& sigc::trackable::operator= </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const <a class="el" href="structsigc_1_1trackable.html">trackable</a>& </td>
<td class="mdname1" valign="top" nowrap> <em>src</em> </td>
<td class="md" valign="top"> ) </td>
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<a class="anchor" name="a5" doxytag="sigc::trackable::remove_destroy_notify_callback"></a><p>
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<td class="md" nowrap valign="top">void sigc::trackable::remove_destroy_notify_callback </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">void* </td>
<td class="mdname1" valign="top" nowrap> <em>data</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const</td>
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<p>
Remove a callback previously installed with <a class="el" href="structsigc_1_1trackable.html#a4">add_destroy_notify_callback()</a>.
<p>
The callback is not executed. <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>data</em> </td><td>Parameter passed into previous call to <a class="el" href="structsigc_1_1trackable.html#a4">add_destroy_notify_callback()</a>. </td></tr>
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<hr>The documentation for this struct was generated from the following file:<ul>
<li><a class="el" href="trackable_8h.html">trackable.h</a></ul>
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