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<title>libsigc++: sigc::slot2< T_return, T_arg1, T_arg2 > Class Template Reference</title>
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<div id="projectname">libsigc++
 <span id="projectnumber">2.4.0</span>
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<li class="navelem"><a class="el" href="namespacesigc.html">sigc</a></li><li class="navelem"><a class="el" href="classsigc_1_1slot2.html">slot2</a></li> </ul>
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<div class="title">sigc::slot2< T_return, T_arg1, T_arg2 > Class Template Reference<div class="ingroups"><a class="el" href="group__slot.html">Slots</a></div></div> </div>
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<p>Converts an arbitrary functor to a unified type which is opaque.
<a href="classsigc_1_1slot2.html#details">More...</a></p>
<p><code>#include <sigc++/functors/slot.h></code></p>
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Inheritance diagram for sigc::slot2< T_return, T_arg1, T_arg2 >:</div>
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<div class="center"><img src="classsigc_1_1slot2__inherit__graph.png" border="0" usemap="#sigc_1_1slot2_3_01T__return_00_01T__arg1_00_01T__arg2_01_4_inherit__map" alt="Inheritance graph"/></div>
<map name="sigc_1_1slot2_3_01T__return_00_01T__arg1_00_01T__arg2_01_4_inherit__map" id="sigc_1_1slot2_3_01T__return_00_01T__arg1_00_01T__arg2_01_4_inherit__map">
<area shape="rect" id="node4" href="classsigc_1_1slot_3_01T__return_00_01T__arg1_00_01T__arg2_00_01nil_00_01nil_00_01nil_00_01nil_00_01nil_01_4.html" title="Convenience wrapper for the numbered sigc::slot2 template. " alt="" coords="9,245,159,301"/><area shape="rect" id="node2" href="classsigc_1_1slot__base.html" title="Base type for slots. " alt="" coords="26,80,141,107"/><area shape="rect" id="node3" href="structsigc_1_1functor__base.html" title="A hint to the compiler. " alt="" coords="15,5,153,32"/></map>
<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr class="memitem:a5e4e9f45f294cc0596822273e909fd04"><td class="memItemLeft" align="right" valign="top">typedef <a class="el" href="structsigc_1_1type__trait.html">type_trait</a>< T_arg1 >::take </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot2.html#a5e4e9f45f294cc0596822273e909fd04">arg1_type_</a></td></tr>
<tr class="separator:a5e4e9f45f294cc0596822273e909fd04"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8b4e8493ea6e18ad923aae1c49c5587d"><td class="memItemLeft" align="right" valign="top">typedef <a class="el" href="structsigc_1_1type__trait.html">type_trait</a>< T_arg2 >::take </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot2.html#a8b4e8493ea6e18ad923aae1c49c5587d">arg2_type_</a></td></tr>
<tr class="separator:a8b4e8493ea6e18ad923aae1c49c5587d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0bb920e3d5628c3d01a4337a2a8a97fc"><td class="memItemLeft" align="right" valign="top">typedef T_return </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot2.html#a0bb920e3d5628c3d01a4337a2a8a97fc">result_type</a></td></tr>
<tr class="separator:a0bb920e3d5628c3d01a4337a2a8a97fc"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_types_classsigc_1_1slot__base"><td colspan="2" onclick="javascript:toggleInherit('pub_types_classsigc_1_1slot__base')"><img src="closed.png" alt="-"/> Public Types inherited from <a class="el" href="classsigc_1_1slot__base.html">sigc::slot_base</a></td></tr>
<tr class="memitem:a7e1a0c2fe43a42187810e8997abeb341 inherit pub_types_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top">typedef <br class="typebreak" />
<a class="el" href="structsigc_1_1trackable.html#a3338954d7565534bd945290b798e13ed">trackable::func_destroy_notify</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a7e1a0c2fe43a42187810e8997abeb341">func_destroy_notify</a></td></tr>
<tr class="separator:a7e1a0c2fe43a42187810e8997abeb341 inherit pub_types_classsigc_1_1slot__base"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a3f9f6cf199bbb40011eca25eb9da67c2"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot2.html#a3f9f6cf199bbb40011eca25eb9da67c2">slot2</a> ()</td></tr>
<tr class="separator:a3f9f6cf199bbb40011eca25eb9da67c2"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a14641110a8fdbb060a58c037b9000730"><td class="memTemplParams" colspan="2">template<class T_functor > </td></tr>
<tr class="memitem:a14641110a8fdbb060a58c037b9000730"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot2.html#a14641110a8fdbb060a58c037b9000730">slot2</a> (const T_functor& _A_func)</td></tr>
<tr class="memdesc:a14641110a8fdbb060a58c037b9000730"><td class="mdescLeft"> </td><td class="mdescRight">Constructs a slot from an arbitrary functor. <a href="#a14641110a8fdbb060a58c037b9000730">More...</a><br /></td></tr>
<tr class="separator:a14641110a8fdbb060a58c037b9000730"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a868deef9d947dfa4fcbb0cfe64cbd42e"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot2.html#a868deef9d947dfa4fcbb0cfe64cbd42e">slot2</a> (const <a class="el" href="classsigc_1_1slot2.html">slot2</a>& src)</td></tr>
<tr class="separator:a868deef9d947dfa4fcbb0cfe64cbd42e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:abae441b7fdd6dd5850a4283d95b9e647"><td class="memItemLeft" align="right" valign="top">T_return </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot2.html#abae441b7fdd6dd5850a4283d95b9e647">operator()</a> (<a class="el" href="classsigc_1_1slot2.html#a5e4e9f45f294cc0596822273e909fd04">arg1_type_</a> _A_a1, <a class="el" href="classsigc_1_1slot2.html#a8b4e8493ea6e18ad923aae1c49c5587d">arg2_type_</a> _A_a2) const </td></tr>
<tr class="memdesc:abae441b7fdd6dd5850a4283d95b9e647"><td class="mdescLeft"> </td><td class="mdescRight">Invoke the contained functor unless slot is in blocking state. <a href="#abae441b7fdd6dd5850a4283d95b9e647">More...</a><br /></td></tr>
<tr class="separator:abae441b7fdd6dd5850a4283d95b9e647"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6b3d5de4d2e7a6134cc883b98380caa7"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classsigc_1_1slot2.html">slot2</a>& </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot2.html#a6b3d5de4d2e7a6134cc883b98380caa7">operator=</a> (const <a class="el" href="classsigc_1_1slot2.html">slot2</a>& src)</td></tr>
<tr class="memdesc:a6b3d5de4d2e7a6134cc883b98380caa7"><td class="mdescLeft"> </td><td class="mdescRight">Overrides this slot making a copy from another slot. <a href="#a6b3d5de4d2e7a6134cc883b98380caa7">More...</a><br /></td></tr>
<tr class="separator:a6b3d5de4d2e7a6134cc883b98380caa7"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_classsigc_1_1slot__base"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classsigc_1_1slot__base')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="classsigc_1_1slot__base.html">sigc::slot_base</a></td></tr>
<tr class="memitem:a558d209f5e7330680b4a6f0e7894be3e inherit pub_methods_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a558d209f5e7330680b4a6f0e7894be3e">slot_base</a> ()</td></tr>
<tr class="memdesc:a558d209f5e7330680b4a6f0e7894be3e inherit pub_methods_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Constructs an empty slot. <a href="#a558d209f5e7330680b4a6f0e7894be3e">More...</a><br /></td></tr>
<tr class="separator:a558d209f5e7330680b4a6f0e7894be3e inherit pub_methods_classsigc_1_1slot__base"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aafce3e11630a5081208a4dd0d809e55f inherit pub_methods_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#aafce3e11630a5081208a4dd0d809e55f">slot_base</a> (rep_type* rep)</td></tr>
<tr class="memdesc:aafce3e11630a5081208a4dd0d809e55f inherit pub_methods_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Constructs a slot from an existing slot_rep object. <a href="#aafce3e11630a5081208a4dd0d809e55f">More...</a><br /></td></tr>
<tr class="separator:aafce3e11630a5081208a4dd0d809e55f inherit pub_methods_classsigc_1_1slot__base"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aadcbb54832b5207bddf89ac5433b531a inherit pub_methods_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#aadcbb54832b5207bddf89ac5433b531a">slot_base</a> (const <a class="el" href="classsigc_1_1slot__base.html">slot_base</a>& src)</td></tr>
<tr class="memdesc:aadcbb54832b5207bddf89ac5433b531a inherit pub_methods_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Constructs a slot, copying an existing one. <a href="#aadcbb54832b5207bddf89ac5433b531a">More...</a><br /></td></tr>
<tr class="separator:aadcbb54832b5207bddf89ac5433b531a inherit pub_methods_classsigc_1_1slot__base"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a75c18c50860f63fb020fc2953576ea57 inherit pub_methods_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a75c18c50860f63fb020fc2953576ea57">~slot_base</a> ()</td></tr>
<tr class="separator:a75c18c50860f63fb020fc2953576ea57 inherit pub_methods_classsigc_1_1slot__base"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:afb626f3bce53c7430ee4b5e00449837e inherit pub_methods_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#afb626f3bce53c7430ee4b5e00449837e">add_destroy_notify_callback</a> (void* data, <a class="el" href="classsigc_1_1slot__base.html#a7e1a0c2fe43a42187810e8997abeb341">func_destroy_notify</a> func) const </td></tr>
<tr class="memdesc:afb626f3bce53c7430ee4b5e00449837e inherit pub_methods_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Add a callback that is executed (notified) when the slot is detroyed. <a href="#afb626f3bce53c7430ee4b5e00449837e">More...</a><br /></td></tr>
<tr class="separator:afb626f3bce53c7430ee4b5e00449837e inherit pub_methods_classsigc_1_1slot__base"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a69042c2e2b0e5449fbf8203e862192a7 inherit pub_methods_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a69042c2e2b0e5449fbf8203e862192a7">block</a> (bool should_block=true)</td></tr>
<tr class="memdesc:a69042c2e2b0e5449fbf8203e862192a7 inherit pub_methods_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Sets the blocking state. <a href="#a69042c2e2b0e5449fbf8203e862192a7">More...</a><br /></td></tr>
<tr class="separator:a69042c2e2b0e5449fbf8203e862192a7 inherit pub_methods_classsigc_1_1slot__base"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a824a4b0b72b85c3b5fb0a9f479790d9e inherit pub_methods_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a824a4b0b72b85c3b5fb0a9f479790d9e">blocked</a> () const </td></tr>
<tr class="memdesc:a824a4b0b72b85c3b5fb0a9f479790d9e inherit pub_methods_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Returns whether the slot is blocked. <a href="#a824a4b0b72b85c3b5fb0a9f479790d9e">More...</a><br /></td></tr>
<tr class="separator:a824a4b0b72b85c3b5fb0a9f479790d9e inherit pub_methods_classsigc_1_1slot__base"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4042d221f7f07a7394d2eb0f14db2857 inherit pub_methods_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a4042d221f7f07a7394d2eb0f14db2857">disconnect</a> ()</td></tr>
<tr class="memdesc:a4042d221f7f07a7394d2eb0f14db2857 inherit pub_methods_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Disconnects the slot. <a href="#a4042d221f7f07a7394d2eb0f14db2857">More...</a><br /></td></tr>
<tr class="separator:a4042d221f7f07a7394d2eb0f14db2857 inherit pub_methods_classsigc_1_1slot__base"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aef88c874f0fc444ff4c5b783b12d2537 inherit pub_methods_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#aef88c874f0fc444ff4c5b783b12d2537">empty</a> () const </td></tr>
<tr class="memdesc:aef88c874f0fc444ff4c5b783b12d2537 inherit pub_methods_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Returns whether the slot is invalid. <a href="#aef88c874f0fc444ff4c5b783b12d2537">More...</a><br /></td></tr>
<tr class="separator:aef88c874f0fc444ff4c5b783b12d2537 inherit pub_methods_classsigc_1_1slot__base"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a37e4b7151de10ac301eda9cd78d580bb inherit pub_methods_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a37e4b7151de10ac301eda9cd78d580bb">operator bool</a> () const </td></tr>
<tr class="memdesc:a37e4b7151de10ac301eda9cd78d580bb inherit pub_methods_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Tests whether a slot is null, because the default constructor was used. <a href="#a37e4b7151de10ac301eda9cd78d580bb">More...</a><br /></td></tr>
<tr class="separator:a37e4b7151de10ac301eda9cd78d580bb inherit pub_methods_classsigc_1_1slot__base"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a19522528264f1646f8ed982b0042ffad inherit pub_methods_classsigc_1_1slot__base"><td class="memItemLeft" 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#a19522528264f1646f8ed982b0042ffad">operator=</a> (const <a class="el" href="classsigc_1_1slot__base.html">slot_base</a>& src)</td></tr>
<tr class="memdesc:a19522528264f1646f8ed982b0042ffad inherit pub_methods_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Overrides this slot making a copy from another slot. <a href="#a19522528264f1646f8ed982b0042ffad">More...</a><br /></td></tr>
<tr class="separator:a19522528264f1646f8ed982b0042ffad inherit pub_methods_classsigc_1_1slot__base"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6374e1400eef020eab09dfdbdc563912 inherit pub_methods_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a6374e1400eef020eab09dfdbdc563912">remove_destroy_notify_callback</a> (void* data) const </td></tr>
<tr class="memdesc:a6374e1400eef020eab09dfdbdc563912 inherit pub_methods_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Remove a callback previously installed with <a class="el" href="classsigc_1_1slot__base.html#afb626f3bce53c7430ee4b5e00449837e" title="Add a callback that is executed (notified) when the slot is detroyed. ">add_destroy_notify_callback()</a>. <a href="#a6374e1400eef020eab09dfdbdc563912">More...</a><br /></td></tr>
<tr class="separator:a6374e1400eef020eab09dfdbdc563912 inherit pub_methods_classsigc_1_1slot__base"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2fb1bd8f20bd2c1f8514193a512d84eb inherit pub_methods_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a2fb1bd8f20bd2c1f8514193a512d84eb">set_parent</a> (void* parent, void*(* cleanup)(void*)) const </td></tr>
<tr class="memdesc:a2fb1bd8f20bd2c1f8514193a512d84eb inherit pub_methods_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Sets the parent of this slot. <a href="#a2fb1bd8f20bd2c1f8514193a512d84eb">More...</a><br /></td></tr>
<tr class="separator:a2fb1bd8f20bd2c1f8514193a512d84eb inherit pub_methods_classsigc_1_1slot__base"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad93eaf25fae13186a1af8f699c6004a1 inherit pub_methods_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#ad93eaf25fae13186a1af8f699c6004a1">unblock</a> ()</td></tr>
<tr class="memdesc:ad93eaf25fae13186a1af8f699c6004a1 inherit pub_methods_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Unsets the blocking state. <a href="#ad93eaf25fae13186a1af8f699c6004a1">More...</a><br /></td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="inherited"></a>
Additional Inherited Members</h2></td></tr>
<tr class="inherit_header pub_attribs_classsigc_1_1slot__base"><td colspan="2" onclick="javascript:toggleInherit('pub_attribs_classsigc_1_1slot__base')"><img src="closed.png" alt="-"/> Public Attributes inherited from <a class="el" href="classsigc_1_1slot__base.html">sigc::slot_base</a></td></tr>
<tr class="memitem:a9dc4958860c0f8300b461a743b7f2a2b inherit pub_attribs_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#a9dc4958860c0f8300b461a743b7f2a2b">blocked_</a></td></tr>
<tr class="memdesc:a9dc4958860c0f8300b461a743b7f2a2b inherit pub_attribs_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Indicates whether the slot is blocked. <a href="#a9dc4958860c0f8300b461a743b7f2a2b">More...</a><br /></td></tr>
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<tr class="memitem:aa482f7dfc73c6950abde0fd51b3125b5 inherit pub_attribs_classsigc_1_1slot__base"><td class="memItemLeft" align="right" valign="top">rep_type* </td><td class="memItemRight" valign="bottom"><a class="el" href="classsigc_1_1slot__base.html#aa482f7dfc73c6950abde0fd51b3125b5">rep_</a></td></tr>
<tr class="memdesc:aa482f7dfc73c6950abde0fd51b3125b5 inherit pub_attribs_classsigc_1_1slot__base"><td class="mdescLeft"> </td><td class="mdescRight">Typed slot_rep object that contains a functor. <a href="#aa482f7dfc73c6950abde0fd51b3125b5">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template<class T_return, class T_arg1, class T_arg2><br />
class sigc::slot2< T_return, T_arg1, T_arg2 ></h3>
<p>Converts an arbitrary functor to a unified type which is opaque. </p>
<p><a class="el" href="classsigc_1_1slot.html" title="Convenience wrapper for the numbered sigc::slot# templates. ">sigc::slot</a> itself is a functor or to be more precise a closure. It contains a single, arbitrary functor (or closure) that is executed in operator()().</p>
<p>The template arguments determine the function signature of operator()():</p><ul>
<li><em>T_return</em> The return type of operator()().</li>
<li><em>T_arg1</em> Argument type used in the definition of operator()(). The default <code>nil</code> means no argument.</li>
<li><em>T_arg2</em> Argument type used in the definition of operator()(). The default <code>nil</code> means no argument.</li>
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<p>To use simply assign the desired functor to the slot. If the functor is not compatible with the parameter list defined with the template arguments compiler errors are triggered. When called the slot will invoke the functor with minimal copies. <a class="el" href="classsigc_1_1slot__base.html#a69042c2e2b0e5449fbf8203e862192a7" title="Sets the blocking state. ">block()</a> and <a class="el" href="classsigc_1_1slot__base.html#ad93eaf25fae13186a1af8f699c6004a1" title="Unsets the blocking state. ">unblock()</a> can be used to block the functor's invocation from operator()() temporarily.</p>
<p>You should use the more convenient unnumbered <a class="el" href="classsigc_1_1slot.html" title="Convenience wrapper for the numbered sigc::slot# templates. ">sigc::slot</a> template. </p>
</div><h2 class="groupheader">Member Typedef Documentation</h2>
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template <class T_return , class T_arg1 , class T_arg2 > </div>
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<td class="memname">typedef <a class="el" href="structsigc_1_1type__trait.html">type_trait</a><T_arg1>::take <a class="el" href="classsigc_1_1slot2.html">sigc::slot2</a>< T_return, T_arg1, T_arg2 >::<a class="el" href="classsigc_1_1slot2.html#a5e4e9f45f294cc0596822273e909fd04">arg1_type_</a></td>
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template <class T_return , class T_arg1 , class T_arg2 > </div>
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<td class="memname">typedef <a class="el" href="structsigc_1_1type__trait.html">type_trait</a><T_arg2>::take <a class="el" href="classsigc_1_1slot2.html">sigc::slot2</a>< T_return, T_arg1, T_arg2 >::<a class="el" href="classsigc_1_1slot2.html#a8b4e8493ea6e18ad923aae1c49c5587d">arg2_type_</a></td>
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template <class T_return , class T_arg1 , class T_arg2 > </div>
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<td class="memname">typedef T_return <a class="el" href="classsigc_1_1slot2.html">sigc::slot2</a>< T_return, T_arg1, T_arg2 >::<a class="el" href="classsigc_1_1slot2.html#a0bb920e3d5628c3d01a4337a2a8a97fc">result_type</a></td>
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<h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname"><a class="el" href="classsigc_1_1slot2.html">sigc::slot2</a>< T_return, T_arg1, T_arg2 >::<a class="el" href="classsigc_1_1slot2.html">slot2</a> </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
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<td class="memname"><a class="el" href="classsigc_1_1slot2.html">sigc::slot2</a>< T_return, T_arg1, T_arg2 >::<a class="el" href="classsigc_1_1slot2.html">slot2</a> </td>
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<p>Constructs a slot from an arbitrary functor. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">_A_func</td><td>The desired functor the new slot should be assigned to. </td></tr>
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<td class="memname"><a class="el" href="classsigc_1_1slot2.html">sigc::slot2</a>< T_return, T_arg1, T_arg2 >::<a class="el" href="classsigc_1_1slot2.html">slot2</a> </td>
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<td class="paramtype">const <a class="el" href="classsigc_1_1slot2.html">slot2</a>< T_return, T_arg1, T_arg2 >& </td>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="paramname"><em>_A_a1</em>, </td>
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<p>Invoke the contained functor unless slot is in blocking state. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">_A_a1</td><td>Argument to be passed on to the functor. </td></tr>
<tr><td class="paramname">_A_a2</td><td>Argument to be passed on to the functor. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>The return value of the functor invocation. </dd></dl>
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<td class="memname"><a class="el" href="classsigc_1_1slot2.html">slot2</a>& <a class="el" href="classsigc_1_1slot2.html">sigc::slot2</a>< T_return, T_arg1, T_arg2 >::operator= </td>
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<p>Overrides this slot making a copy from another slot. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">src</td><td>The slot from which to make a copy. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd><code>this</code>. </dd></dl>
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