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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>libsigc++ 2.0: sigc::slot_base Class Reference</title>
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<h1>sigc::slot_base Class Reference<br>
<small>
[<a class="el" href="group__slot.html">Slots</a>]</small>
</h1>Base type for slots.
<a href="#_details">More...</a>
<p>
Inheritance diagram for sigc::slot_base:<p><center><img src="classsigc_1_1slot__base__inherit__graph.png" border="0" usemap="#sigc_1_1slot__base__inherit__map" alt="Inheritance graph"></center>
<map name="sigc_1_1slot__base__inherit__map">
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<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="classsigc_1_1slot__base-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<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="structsigc_1_1trackable.html#w0">trackable::func_destroy_notify</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.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="classsigc_1_1slot__base.html#a0">slot_base</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Constructs an empty slot. <a href="#a0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a1">slot_base</a> (<a class="el" href="structsigc_1_1internal_1_1slot__rep.html">rep_type</a>* rep)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Constructs a slot from an existing slot_rep object. <a href="#a1"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a2">slot_base</a> (const <a class="el" href="classsigc_1_1slot__base.html">slot_base</a>& src)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Constructs a slot, copying an existing one. <a href="#a2"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a3">~slot_base</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a4">operator bool</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Tests whether a slot is null, because the default constructor was used. <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="classsigc_1_1slot__base.html#a5">set_parent</a> (void* parent, void*(* cleanup)(void*)) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the parent of this slot. <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="classsigc_1_1slot__base.html#a6">add_destroy_notify_callback</a> (void* data, <a class="el" href="classsigc_1_1slot__base.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 slot is detroyed. <a href="#a6"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a7">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="classsigc_1_1slot__base.html#a6">add_destroy_notify_callback()</a>. <a href="#a7"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a8">empty</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns whether the slot is invalid. <a href="#a8"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a9">blocked</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns whether the slot is blocked. <a href="#a9"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a10">block</a> (bool should_block=true)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the blocking state. <a href="#a10"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a11">unblock</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Unsets the blocking state. <a href="#a11"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a12">disconnect</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Disconnects the slot. <a href="#a12"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Public Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="structsigc_1_1internal_1_1slot__rep.html">rep_type</a>* </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#o0">rep_</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Typed slot_rep object that contains a functor. <a href="#o0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#o1">blocked_</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Indicates whether the slot is blocked. <a href="#o1"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classsigc_1_1slot__base.html">slot_base</a>& </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#b0">operator=</a> (const <a class="el" href="classsigc_1_1slot__base.html">slot_base</a>& src)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Overrides this slot making a copy from another slot. <a href="#b0"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Base type for slots.
<p>
<a class="el" href="classsigc_1_1slot__base.html">slot_base</a> integrates most of the interface of the derived <a class="el" href="classsigc_1_1slot.html">sigc::slot</a> templates. slots can be connected to signals, be disconnected at some later point (<a class="el" href="classsigc_1_1slot__base.html#a12">disconnect()</a>) and temporarily be blocked (<a class="el" href="classsigc_1_1slot__base.html#a10">block()</a>, <a class="el" href="classsigc_1_1slot__base.html#a11">unblock()</a>). The validity of a slot can be tested with <a class="el" href="classsigc_1_1slot__base.html#a8">empty()</a>.<p>
The internal representation of a <a class="el" href="structsigc_1_1internal_1_1slot__rep.html">sigc::internal::slot_rep</a> derived type is built from slot_base's derivations. <a class="el" href="classsigc_1_1slot__base.html#a5">set_parent()</a> is used to register a notification callback that is executed when the slot gets invalid. <a class="el" href="classsigc_1_1slot__base.html#a6">add_destroy_notify_callback()</a> is used by connection objects to add a notification callback that is executed on destruction.
<p>
<hr><h2>Member Typedef Documentation</h2>
<a class="anchor" name="w0" doxytag="sigc::slot_base::func_destroy_notify"></a><p>
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<td class="md" nowrap valign="top">typedef <a class="el" href="structsigc_1_1trackable.html#w0">trackable::func_destroy_notify</a> <a class="el" href="classsigc_1_1slot__base.html#w0">sigc::slot_base::func_destroy_notify</a> </td>
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</td>
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<td>
</td>
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<p>
</td>
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<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="a0" doxytag="sigc::slot_base::slot_base"></a><p>
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<td class="md" nowrap valign="top">sigc::slot_base::slot_base </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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<p>
Constructs an empty slot.
<p>
</td>
</tr>
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<a class="anchor" name="a1" doxytag="sigc::slot_base::slot_base"></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="md" nowrap valign="top">sigc::slot_base::slot_base </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top"><a class="el" href="structsigc_1_1internal_1_1slot__rep.html">rep_type</a>* </td>
<td class="mdname1" valign="top" nowrap> <em>rep</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [explicit]</code></td>
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<td>
</td>
<td>
<p>
Constructs a slot from an existing slot_rep object.
<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>rep</em> </td><td>The slot_rep object this slot should contain. </td></tr>
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</dl>
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<a class="anchor" name="a2" doxytag="sigc::slot_base::slot_base"></a><p>
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<td class="md" nowrap valign="top">sigc::slot_base::slot_base </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const <a class="el" href="classsigc_1_1slot__base.html">slot_base</a>& </td>
<td class="mdname1" valign="top" nowrap> <em>src</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
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<td>
</td>
<td>
<p>
Constructs a slot, copying an existing one.
<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>src</em> </td><td>The existing slot to copy. </td></tr>
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<a class="anchor" name="a3" doxytag="sigc::slot_base::~slot_base"></a><p>
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<td class="md" nowrap valign="top">sigc::slot_base::~<a class="el" href="classsigc_1_1slot__base.html">slot_base</a> </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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<td>
</td>
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</td>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="a6" doxytag="sigc::slot_base::add_destroy_notify_callback"></a><p>
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<td class="md" nowrap valign="top">void sigc::slot_base::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>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap><a class="el" href="classsigc_1_1slot__base.html#w0">func_destroy_notify</a> </td>
<td class="mdname" nowrap> <em>func</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"> const</td>
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<p>
Add a callback that is executed (notified) when the slot is detroyed.
<p>
This function is used internally by connection objects. <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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</dl>
</td>
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<a class="anchor" name="a10" doxytag="sigc::slot_base::block"></a><p>
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<td class="md" nowrap valign="top">bool sigc::slot_base::block </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">bool </td>
<td class="mdname1" valign="top" nowrap> <em>should_block</em> = <code>true</code> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
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</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
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<td>
</td>
<td>
<p>
Sets the blocking state.
<p>
If <em>should_block</em> is <code>true</code> then the blocking state is set. Subsequent calls to <a class="el" href="classsigc_1_1slot7.html#a0">slot::operator()()</a> don't invoke the functor contained by this slot until <a class="el" href="classsigc_1_1slot__base.html#a11">unblock()</a> or <a class="el" href="classsigc_1_1slot__base.html#a10">block()</a> with <em>should_block</em> = <code>false</code> is called. <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>should_block</em> </td><td>Indicates whether the blocking state should be set or unset. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd><code>true</code> if the slot was in blocking state before. </dd></dl>
</td>
</tr>
</table>
<a class="anchor" name="a9" doxytag="sigc::slot_base::blocked"></a><p>
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<td class="md" nowrap valign="top">bool sigc::slot_base::blocked </td>
<td class="md" valign="top">(</td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [inline]</code></td>
</tr>
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</td>
</tr>
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<table cellspacing="5" cellpadding="0" border="0">
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<td>
</td>
<td>
<p>
Returns whether the slot is blocked.
<p>
<dl compact><dt><b>Returns:</b></dt><dd><code>true</code> if the slot is blocked. </dd></dl>
</td>
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<a class="anchor" name="a12" doxytag="sigc::slot_base::disconnect"></a><p>
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<td class="md" nowrap valign="top">void sigc::slot_base::disconnect </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>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Disconnects the slot.
<p>
Invalidates the slot and notifies the parent. </td>
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<a class="anchor" name="a8" doxytag="sigc::slot_base::empty"></a><p>
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<td class="md" nowrap valign="top">bool sigc::slot_base::empty </td>
<td class="md" valign="top">(</td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [inline]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
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<td>
</td>
<td>
<p>
Returns whether the slot is invalid.
<p>
<dl compact><dt><b>Returns:</b></dt><dd><code>true</code> if the slot is invalid (empty). </dd></dl>
</td>
</tr>
</table>
<a class="anchor" name="a4" doxytag="sigc::slot_base::operator bool"></a><p>
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<td class="md" nowrap valign="top">sigc::slot_base::operator bool </td>
<td class="md" valign="top">(</td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const</td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Tests whether a slot is null, because the default constructor was used.
<p>
Test a slot for null like so: <div class="fragment"><pre class="fragment"> <span class="keywordflow">if</span>(slot)
do_something()
</pre></div> </td>
</tr>
</table>
<a class="anchor" name="b0" doxytag="sigc::slot_base::operator="></a><p>
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<td class="md" nowrap valign="top"><a class="el" href="classsigc_1_1slot__base.html">slot_base</a>& sigc::slot_base::operator= </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const <a class="el" href="classsigc_1_1slot__base.html">slot_base</a>& </td>
<td class="mdname1" valign="top" nowrap> <em>src</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [protected]</code></td>
</tr>
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</td>
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<td>
</td>
<td>
<p>
Overrides this slot making a copy from another slot.
<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>src</em> </td><td>The slot from which to make a copy. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd><code>this</code>. </dd></dl>
</td>
</tr>
</table>
<a class="anchor" name="a7" doxytag="sigc::slot_base::remove_destroy_notify_callback"></a><p>
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<td class="md" nowrap valign="top">void sigc::slot_base::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>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Remove a callback previously installed with <a class="el" href="classsigc_1_1slot__base.html#a6">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="classsigc_1_1slot__base.html#a6">add_destroy_notify_callback()</a>. </td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="a5" doxytag="sigc::slot_base::set_parent"></a><p>
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<td class="md" nowrap valign="top">void sigc::slot_base::set_parent </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">void* </td>
<td class="mdname" nowrap> <em>parent</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>void *(*)(void *) </td>
<td class="mdname" nowrap> <em>cleanup</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"> const</td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Sets the parent of this slot.
<p>
This function is used by signals to register a notification callback. This notification callback is executed when the slot becomes invalid because of some referred object dying. <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>parent</em> </td><td>The new parent. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>cleanup</em> </td><td>The notification callback. </td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="a11" doxytag="sigc::slot_base::unblock"></a><p>
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<td class="md" nowrap valign="top">bool sigc::slot_base::unblock </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>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Unsets the blocking state.
<p>
<dl compact><dt><b>Returns:</b></dt><dd><code>true</code> if the slot was in blocking state before. </dd></dl>
</td>
</tr>
</table>
<hr><h2>Member Data Documentation</h2>
<a class="anchor" name="o1" doxytag="sigc::slot_base::blocked_"></a><p>
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<td class="md" nowrap valign="top">bool <a class="el" href="classsigc_1_1slot__base.html#o1">sigc::slot_base::blocked_</a> </td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Indicates whether the slot is blocked.
<p>
</td>
</tr>
</table>
<a class="anchor" name="o0" doxytag="sigc::slot_base::rep_"></a><p>
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<td class="md" nowrap valign="top"><a class="el" href="structsigc_1_1internal_1_1slot__rep.html">rep_type</a>* <a class="el" href="classsigc_1_1slot__base.html#o0">sigc::slot_base::rep_</a><code> [mutable]</code> </td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Typed slot_rep object that contains a functor.
<p>
</td>
</tr>
</table>
<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="slot__base_8h.html">slot_base.h</a></ul>
<hr><address><small>
Generated for libsigc++ 2.0 by <a href="http://www.doxygen.org/index.html">
Doxygen</a> 1.3.9.1 © 1997-2001</small></address>
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