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<h1>sigc::signal_base Struct Reference<br/>
<small>
[<a class="el" href="group__signal.html">Signals</a>]</small>
</h1> </div>
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<!-- doxytag: class="sigc::signal_base" --><!-- doxytag: inherits="sigc::trackable" -->
<p>Base class for the <a class="el" href="classsigc_1_1signal.html" title="Convenience wrapper for the numbered sigc::signal# templates.">sigc::signal</a># templates. <a href="#_details">More...</a></p>
<p><code>#include <sigc++/signal_base.h></code></p>
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Inheritance diagram for sigc::signal_base:<!-- endSectionHeader --></div>
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<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center><!-- endSectionContent --></div>
<p><a href="structsigc_1_1signal__base-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="aea0a19d1bfe7fd0f0e04668e6813d859"></a><!-- doxytag: member="sigc::signal_base::size_type" ref="aea0a19d1bfe7fd0f0e04668e6813d859" args="" -->
typedef <a class="elRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01134.html#ad477e282dc33a113ed64628b9b32e3dd">size_t</a> </td><td class="memItemRight" valign="bottom"><b>size_type</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="aaeb49371ba502691978e2f860117e3c3"></a><!-- doxytag: member="sigc::signal_base::signal_base" ref="aaeb49371ba502691978e2f860117e3c3" args="(const signal_base &src)" -->
 </td><td class="memItemRight" valign="bottom"><b>signal_base</b> (const <a class="el" href="structsigc_1_1signal__base.html">signal_base</a>& src)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a90b36a7b33e107ce0af0de895e0df286"></a><!-- doxytag: member="sigc::signal_base::operator=" ref="a90b36a7b33e107ce0af0de895e0df286" args="(const signal_base &src)" -->
<a class="el" href="structsigc_1_1signal__base.html">signal_base</a>& </td><td class="memItemRight" valign="bottom"><b>operator=</b> (const <a class="el" href="structsigc_1_1signal__base.html">signal_base</a>& src)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1signal__base.html#abc8fe88ca813837ff3fb3ef4ecb4e8a7">empty</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns whether the list of slots is empty. <a href="#abc8fe88ca813837ff3fb3ef4ecb4e8a7"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a17597d66e680d222248c523985f0afd6"></a><!-- doxytag: member="sigc::signal_base::clear" ref="a17597d66e680d222248c523985f0afd6" args="()" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1signal__base.html#a17597d66e680d222248c523985f0afd6">clear</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Empties the list of slots. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">size_type </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1signal__base.html#a06e0889c75cccc15dcec71a48acae00d">size</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the number of slots in the list. <a href="#a06e0889c75cccc15dcec71a48acae00d"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="pro-types"></a>
Protected Types</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a328b132e5dfb99dbc3aae1e5c3bb0981"></a><!-- doxytag: member="sigc::signal_base::iterator_type" ref="a328b132e5dfb99dbc3aae1e5c3bb0981" args="" -->
typedef <br class="typebreak"/>
<a class="elRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00331.html">internal::signal_impl::iterator_type</a> </td><td class="memItemRight" valign="bottom"><b>iterator_type</b></td></tr>
<tr><td colspan="2"><h2><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00331.html">iterator_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1signal__base.html#a5c89a76a27d69c512f554b841b1bd08a">connect</a> (const <a class="el" href="classsigc_1_1slot__base.html">slot_base</a>& slot_)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Adds a slot at the end of the list of slots. <a href="#a5c89a76a27d69c512f554b841b1bd08a"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00331.html">iterator_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1signal__base.html#a87da23ad801faa9e2b6b4be2a747e757">insert</a> (<a class="elRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00331.html">iterator_type</a> i, const <a class="el" href="classsigc_1_1slot__base.html">slot_base</a>& slot_)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Adds a slot at the given position into the list of slots. <a href="#a87da23ad801faa9e2b6b4be2a747e757"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00331.html">iterator_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1signal__base.html#a21efc57eea29c3139855909ad4807984">erase</a> (<a class="elRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00331.html">iterator_type</a> i)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Removes the slot at the given position from the list of slots. <a href="#a21efc57eea29c3139855909ad4807984"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">internal::signal_impl* </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1signal__base.html#ab1b7d9bc2a59c4c67d0123a65a7baab9">impl</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the signal_impl object encapsulating the list of slots. <a href="#ab1b7d9bc2a59c4c67d0123a65a7baab9"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="pro-attribs"></a>
Protected Attributes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a747d448c28fd256ef580d165eb69f17a"></a><!-- doxytag: member="sigc::signal_base::impl_" ref="a747d448c28fd256ef580d165eb69f17a" args="" -->
internal::signal_impl* </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1signal__base.html#a747d448c28fd256ef580d165eb69f17a">impl_</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The signal_impl object encapsulating the slot list. <br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>Base class for the <a class="el" href="classsigc_1_1signal.html" title="Convenience wrapper for the numbered sigc::signal# templates.">sigc::signal</a># templates. </p>
<p><a class="el" href="structsigc_1_1signal__base.html" title="Base class for the sigc::signal# templates.">signal_base</a> integrates most of the interface of the derived <a class="el" href="classsigc_1_1signal.html" title="Convenience wrapper for the numbered sigc::signal# templates.">sigc::signal</a># templates. The implementation, however, resides in sigc::internal::signal_impl. A sigc::internal::signal_impl object is dynamically allocated from <a class="el" href="structsigc_1_1signal__base.html" title="Base class for the sigc::signal# templates.">signal_base</a> when first connecting a slot to the signal. This ensures that empty signals don't waste memory. </p>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a5c89a76a27d69c512f554b841b1bd08a"></a><!-- doxytag: member="sigc::signal_base::connect" ref="a5c89a76a27d69c512f554b841b1bd08a" args="(const slot_base &slot_)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="elRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00331.html">iterator_type</a> sigc::signal_base::connect </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classsigc_1_1slot__base.html">slot_base</a>& </td>
<td class="paramname"> <em>slot_</em> )</td>
<td><code> [protected]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Adds a slot at the end of the list of slots. </p>
<p>With <a class="el" href="structsigc_1_1signal__base.html#a5c89a76a27d69c512f554b841b1bd08a" title="Adds a slot at the end of the list of slots.">connect()</a>, slots can also be added during signal emission. In this case, they won't be executed until the next emission occurs. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">slot_</td><td>The slot to add to the list of slots. </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>An iterator pointing to the new slot in the list. </dd></dl>
</div>
</div>
<a class="anchor" id="abc8fe88ca813837ff3fb3ef4ecb4e8a7"></a><!-- doxytag: member="sigc::signal_base::empty" ref="abc8fe88ca813837ff3fb3ef4ecb4e8a7" args="() const " -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">bool sigc::signal_base::empty </td>
<td>(</td>
<td class="paramname"> )</td>
<td> const<code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Returns whether the list of slots is empty. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd><code>true</code> if the list of slots is empty. </dd></dl>
</div>
</div>
<a class="anchor" id="a21efc57eea29c3139855909ad4807984"></a><!-- doxytag: member="sigc::signal_base::erase" ref="a21efc57eea29c3139855909ad4807984" args="(iterator_type i)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="elRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00331.html">iterator_type</a> sigc::signal_base::erase </td>
<td>(</td>
<td class="paramtype"><a class="elRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00331.html">iterator_type</a> </td>
<td class="paramname"> <em>i</em> )</td>
<td><code> [protected]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Removes the slot at the given position from the list of slots. </p>
<p>Note that this function does not work during signal emission! </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">i</td><td>An iterator pointing to the slot to be removed. </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>An iterator pointing to the slot in the list after the one removed. </dd></dl>
</div>
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<a class="anchor" id="ab1b7d9bc2a59c4c67d0123a65a7baab9"></a><!-- doxytag: member="sigc::signal_base::impl" ref="ab1b7d9bc2a59c4c67d0123a65a7baab9" args="() const " -->
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<td class="memname">internal::signal_impl* sigc::signal_base::impl </td>
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<p>Returns the signal_impl object encapsulating the list of slots. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>The signal_impl object encapsulating the list of slots. </dd></dl>
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<a class="anchor" id="a87da23ad801faa9e2b6b4be2a747e757"></a><!-- doxytag: member="sigc::signal_base::insert" ref="a87da23ad801faa9e2b6b4be2a747e757" args="(iterator_type i, const slot_base &slot_)" -->
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<td class="memname"><a class="elRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00331.html">iterator_type</a> sigc::signal_base::insert </td>
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<p>Adds a slot at the given position into the list of slots. </p>
<p>Note that this function does not work during signal emission! </p>
<dl><dt><b>Parameters:</b></dt><dd>
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<tr><td class="paramname">i</td><td>An iterator indicating the position where <em>slot_</em> should be inserted. </td></tr>
<tr><td class="paramname">slot_</td><td>The slot to add to the list of slots. </td></tr>
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<dl class="return"><dt><b>Returns:</b></dt><dd>An iterator pointing to the new slot in the list. </dd></dl>
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<a class="anchor" id="a06e0889c75cccc15dcec71a48acae00d"></a><!-- doxytag: member="sigc::signal_base::size" ref="a06e0889c75cccc15dcec71a48acae00d" args="() const " -->
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<td class="memname">size_type sigc::signal_base::size </td>
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<p>Returns the number of slots in the list. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>The number of slots in the list. </dd></dl>
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