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   <div id="projectname">libsigc++
   &#160;<span id="projectnumber">2.4.0</span>
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<div class="title">Slots<div class="ingroups"><a class="el" href="group__sigcfunctors.html">Functors</a></div></div>  </div>
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<p>Slots are type-safe representations of callback methods and functions.  
<a href="#details">More...</a></p>
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Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1nil.html">sigc::nil</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">nil struct type.  <a href="structsigc_1_1nil.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot.html">sigc::slot&lt; T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6, T_arg7 &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Convenience wrapper for the numbered <a class="el" href="classsigc_1_1slot.html" title="Convenience wrapper for the numbered sigc::slot# templates. ">sigc::slot</a># templates.  <a href="classsigc_1_1slot.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot0.html">sigc::slot0&lt; T_return &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Converts an arbitrary functor to a unified type which is opaque.  <a href="classsigc_1_1slot0.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot1.html">sigc::slot1&lt; T_return, T_arg1 &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Converts an arbitrary functor to a unified type which is opaque.  <a href="classsigc_1_1slot1.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot2.html">sigc::slot2&lt; T_return, T_arg1, T_arg2 &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Converts an arbitrary functor to a unified type which is opaque.  <a href="classsigc_1_1slot2.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot3.html">sigc::slot3&lt; T_return, T_arg1, T_arg2, T_arg3 &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Converts an arbitrary functor to a unified type which is opaque.  <a href="classsigc_1_1slot3.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot4.html">sigc::slot4&lt; T_return, T_arg1, T_arg2, T_arg3, T_arg4 &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Converts an arbitrary functor to a unified type which is opaque.  <a href="classsigc_1_1slot4.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot5.html">sigc::slot5&lt; T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5 &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Converts an arbitrary functor to a unified type which is opaque.  <a href="classsigc_1_1slot5.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot6.html">sigc::slot6&lt; T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6 &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Converts an arbitrary functor to a unified type which is opaque.  <a href="classsigc_1_1slot6.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot7.html">sigc::slot7&lt; T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6, T_arg7 &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Converts an arbitrary functor to a unified type which is opaque.  <a href="classsigc_1_1slot7.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html">sigc::slot_base</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Base type for slots.  <a href="classsigc_1_1slot__base.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>Slots are type-safe representations of callback methods and functions. </p>
<p>A Slot can be constructed from any function object or function, regardless of whether it is a global function, a member method, static, or virtual.</p>
<p>Use the <a class="el" href="group__mem__fun.html#gadf6b6d22c503b439019f0a2e77352419" title="Creates a functor of type sigc::mem_functor0 which wraps a method. ">sigc::mem_fun()</a> and <a class="el" href="group__ptr__fun.html#ga9c80de72f656fb05e81fda622dddc863" title="Creates a functor of type sigc::pointer_functor0 which wraps an existing non-member function...">sigc::ptr_fun()</a> template functions to get a <a class="el" href="classsigc_1_1slot.html" title="Convenience wrapper for the numbered sigc::slot# templates. ">sigc::slot</a>, like so:</p>
<div class="fragment"><div class="line"><a class="code" href="classsigc_1_1slot.html">sigc::slot&lt;void, int&gt;</a> sl = <a class="code" href="group__mem__fun.html#gadf6b6d22c503b439019f0a2e77352419">sigc::mem_fun</a>(someobj, &amp;SomeClass::somemethod);</div>
</div><!-- fragment --><p>or</p>
<div class="fragment"><div class="line"><a class="code" href="classsigc_1_1slot.html">sigc::slot&lt;void, int&gt;</a> sl = <a class="code" href="group__ptr__fun.html#ga9c80de72f656fb05e81fda622dddc863">sigc::ptr_fun</a>(&amp;somefunction);</div>
</div><!-- fragment --><p>or</p>
<div class="fragment"><div class="line">m_Button.signal_clicked().connect( <a class="code" href="group__mem__fun.html#gadf6b6d22c503b439019f0a2e77352419">sigc::mem_fun</a>(*<span class="keyword">this</span>, &amp;MyWindow::on_button_clicked) );</div>
</div><!-- fragment --><p>The compiler will complain if SomeClass::somemethod, etc. have the wrong signature.</p>
<p>You can also pass slots as method parameters where you might normally pass a function pointer.</p>
<p>A C++11 lambda expression is a functor (function object). It is automatically wrapped in a slot, if it is connected to a signal. </p><div class="fragment"><div class="line"><span class="keyword">auto</span> on_response = [&amp;someobj] (<span class="keywordtype">int</span> response_id)</div>
<div class="line">  {</div>
<div class="line">    someobj.somemethod(response_id);</div>
<div class="line">    somefunction(response_id);</div>
<div class="line">  };</div>
<div class="line">m_Dialog.signal_response().connect(on_response);</div>
</div><!-- fragment --><p>If you connect a C++11 lambda expression or a std::function&lt;&gt; instance to a signal or assign it to a slot,</p><ul>
<li>if the return type is not void, you must use the <a class="el" href="group__sigcfunctors.html#gadf1ba3cacb09cc5c3c3e399836ec6e50" title="Helper macro, if you want to mix user-defined and third party functors with libsigc++. ">SIGC_FUNCTORS_DEDUCE_RESULT_TYPE_WITH_DECLTYPE</a> macro,</li>
<li>if your functor contains references to <a class="el" href="structsigc_1_1trackable.html" title="Base class for objects with auto-disconnection. ">sigc::trackable</a> derived objects, those objects will not be tracked, unless you also use <a class="el" href="group__track__obj.html#ga8fd1ab36d123ff83dd4cd8dc58bb28e2" title="Creates an adaptor of type sigc::track_obj_functor1 which wraps a functor. ">sigc::track_obj()</a>. </li>
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