119 lines
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119 lines
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<title>libsigc++: Slots</title>
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<div id="projectname">libsigc++
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 <span id="projectnumber">2.10.3</span>
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<a href="#nested-classes">Classes</a> </div>
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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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<div class="contents">
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<p>Slots are type-safe representations of callback methods and functions.
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<a href="#details">More...</a></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
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Classes</h2></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1nil.html">sigc::nil</a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">nil struct type. <a href="structsigc_1_1nil.html#details">More...</a><br /></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot.html">sigc::slot< T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6, T_arg7 ></a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </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>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot0.html">sigc::slot0< T_return ></a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </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>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot1.html">sigc::slot1< T_return, T_arg1 ></a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </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>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot2.html">sigc::slot2< T_return, T_arg1, T_arg2 ></a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </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>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot3.html">sigc::slot3< T_return, T_arg1, T_arg2, T_arg3 ></a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </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>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot4.html">sigc::slot4< T_return, T_arg1, T_arg2, T_arg3, T_arg4 ></a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </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>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot5.html">sigc::slot5< T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5 ></a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </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>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot6.html">sigc::slot6< T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6 ></a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </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>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot7.html">sigc::slot7< T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6, T_arg7 ></a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </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>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot_3_01T__return_07T__arg_8_8_8_08_4.html">sigc::slot< T_return(T_arg...)></a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Converts an arbitrary functor to a unified type which is opaque. <a href="classsigc_1_1slot_3_01T__return_07T__arg_8_8_8_08_4.html#details">More...</a><br /></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html">sigc::slot_base</a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Base type for slots. <a href="classsigc_1_1slot__base.html#details">More...</a><br /></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<p>Slots are type-safe representations of callback methods and functions. </p>
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<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>
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<h1><a class="anchor" id="slots-creating"></a>
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Creating Slots</h1>
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<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> or <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<void, int></a> sl = <a class="code" href="group__mem__fun.html#gadf6b6d22c503b439019f0a2e77352419">sigc::mem_fun</a>(someobj,& SomeClass::somemethod);</div></div><!-- fragment --><p> or </p><div class="fragment"><div class="line"><a class="code" href="classsigc_1_1slot.html">sigc::slot<void, int></a> sl = <a class="code" href="group__ptr__fun.html#ga9c80de72f656fb05e81fda622dddc863">sigc::ptr_fun</a>(& somefunction);</div></div><!-- fragment --><p> or, in gtkmm, </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>,& MyWindow::on_button_clicked) );</div></div><!-- fragment --><p>The compiler will complain if SomeClass::somemethod, etc. have the wrong signature.</p>
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<p>You can also pass slots as method parameters where you might normally pass a function pointer.</p>
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<h1><a class="anchor" id="slots-auto-disconnect"></a>
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Member Methods and Automatic Disconnection</h1>
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<p>See <a class="el" href="group__mem__fun.html">sigc::mem_fun()</a> about deriving from <a class="el" href="structsigc_1_1trackable.html" title="Base class for objects with auto-disconnection. ">sigc::trackable</a> to prevent member methods from being called after the instance has been destroyed.</p>
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<h1><a class="anchor" id="slots-auto"></a>
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auto</h1>
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<p><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> return functors, but those functors are not slots. </p><div class="fragment"><div class="line"><a class="code" href="classsigc_1_1slot.html">sigc::slot<void, int></a> sl = <a class="code" href="group__mem__fun.html#gadf6b6d22c503b439019f0a2e77352419">sigc::mem_fun</a>(someobj,& SomeClass::somemethod);</div></div><!-- fragment --><p> is not equivalent to </p><div class="fragment"><div class="line"><span class="keyword">auto</span> sl = <a class="code" href="group__mem__fun.html#gadf6b6d22c503b439019f0a2e77352419">sigc::mem_fun</a>(someobj,& SomeClass::somemethod); <span class="comment">// Not a slot!</span></div></div><!-- fragment --><p>If you don't explicitly use a <a class="el" href="classsigc_1_1slot.html" title="Convenience wrapper for the numbered sigc::slot# templates. ">sigc::slot</a> then the slot could call a method on an instance after it has been destroyed even if the method is in a class that derives from <a class="el" href="structsigc_1_1trackable.html" title="Base class for objects with auto-disconnection. ">sigc::trackable</a>.</p>
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<h1><a class="anchor" id="slots-with-lambdas"></a>
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C++ Lambdas</h1>
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<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 = [&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<> instance to a signal or assign it to a slot,</p><ul>
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<li>With libsigc++ versions before 2.6, 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>
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<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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