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 <span id="projectnumber">2.10.3</span>
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<div class="title">hide(), hide_return()<div class="ingroups"><a class="el" href="group__adaptors.html">Adaptors</a></div></div> </div>
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<p><a class="el" href="group__hide.html#gaf2cefea3a99acd44f68121424103172d" title="Creates an adaptor of type sigc::hide_functor which adds a dummy parameter to the passed functor...">sigc::hide()</a> alters an arbitrary functor in that it adds a parameter whose value is ignored on invocation of the returned functor.
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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_1hide__functor.html">sigc::hide_functor< I_location, T_functor ></a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Adaptor that adds a dummy parameter to the wrapped functor. <a href="structsigc_1_1hide__functor.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">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1hide__functor_3_010_00_01T__functor_01_4.html">sigc::hide_functor< 0, T_functor ></a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Adaptor that adds a dummy parameter to the wrapped functor. <a href="structsigc_1_1hide__functor_3_010_00_01T__functor_01_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">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1hide__functor_3-1_00_01T__functor_01_4.html">sigc::hide_functor<-1, T_functor ></a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Adaptor that adds a dummy parameter to the wrapped functor. <a href="structsigc_1_1hide__functor_3-1_00_01T__functor_01_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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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:gaf2cefea3a99acd44f68121424103172d"><td class="memTemplParams" colspan="2">template<int I_location, class T_functor > </td></tr>
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<tr class="memitem:gaf2cefea3a99acd44f68121424103172d"><td class="memTemplItemLeft" align="right" valign="top">hide_functor< I_location, T_functor > </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__hide.html#gaf2cefea3a99acd44f68121424103172d">sigc::hide</a> (const T_functor& _A_func)</td></tr>
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<tr class="memdesc:gaf2cefea3a99acd44f68121424103172d"><td class="mdescLeft"> </td><td class="mdescRight">Creates an adaptor of type <a class="el" href="structsigc_1_1hide__functor.html" title="Adaptor that adds a dummy parameter to the wrapped functor. ">sigc::hide_functor</a> which adds a dummy parameter to the passed functor. <a href="group__hide.html#gaf2cefea3a99acd44f68121424103172d">More...</a><br /></td></tr>
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<tr class="separator:gaf2cefea3a99acd44f68121424103172d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gacbbacd3553268d85b95e3a85aefb67e5"><td class="memTemplParams" colspan="2">template<class T_functor > </td></tr>
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<tr class="memitem:gacbbacd3553268d85b95e3a85aefb67e5"><td class="memTemplItemLeft" align="right" valign="top">hide_functor<-1, T_functor > </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__hide.html#gacbbacd3553268d85b95e3a85aefb67e5">sigc::hide</a> (const T_functor& _A_func)</td></tr>
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<tr class="memdesc:gacbbacd3553268d85b95e3a85aefb67e5"><td class="mdescLeft"> </td><td class="mdescRight">Creates an adaptor of type <a class="el" href="structsigc_1_1hide__functor.html" title="Adaptor that adds a dummy parameter to the wrapped functor. ">sigc::hide_functor</a> which adds a dummy parameter to the passed functor. <a href="group__hide.html#gacbbacd3553268d85b95e3a85aefb67e5">More...</a><br /></td></tr>
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<tr class="separator:gacbbacd3553268d85b95e3a85aefb67e5"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gae4e6f5491471c12440f1c5d480726b98"><td class="memTemplParams" colspan="2">template<class T_functor > </td></tr>
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<tr class="memitem:gae4e6f5491471c12440f1c5d480726b98"><td class="memTemplItemLeft" align="right" valign="top">retype_return_functor< void, T_functor > </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__hide.html#gae4e6f5491471c12440f1c5d480726b98">sigc::hide_return</a> (const T_functor& _A_functor)</td></tr>
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<tr class="memdesc:gae4e6f5491471c12440f1c5d480726b98"><td class="mdescLeft"> </td><td class="mdescRight">Creates an adaptor of type <a class="el" href="structsigc_1_1retype__return__functor.html" title="Adaptor that performs a C-style cast on the return value of a functor. ">sigc::retype_return_functor</a> which drops the return value of the passed functor. <a href="group__hide.html#gae4e6f5491471c12440f1c5d480726b98">More...</a><br /></td></tr>
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<tr class="separator:gae4e6f5491471c12440f1c5d480726b98"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<p><a class="el" href="group__hide.html#gaf2cefea3a99acd44f68121424103172d" title="Creates an adaptor of type sigc::hide_functor which adds a dummy parameter to the passed functor...">sigc::hide()</a> alters an arbitrary functor in that it adds a parameter whose value is ignored on invocation of the returned functor. </p>
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<p>Thus you can discard one argument of a signal.</p>
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<p>You may optionally specify the zero-based position of the parameter to ignore as a template argument. The default is to ignore the last parameter. (A value of <code>-1</code> adds a parameter at the end so <a class="el" href="group__hide.html#gaf2cefea3a99acd44f68121424103172d" title="Creates an adaptor of type sigc::hide_functor which adds a dummy parameter to the passed functor...">sigc::hide</a><-1>() gives the same result as <a class="el" href="group__hide.html#gaf2cefea3a99acd44f68121424103172d" title="Creates an adaptor of type sigc::hide_functor which adds a dummy parameter to the passed functor...">sigc::hide()</a>.)</p>
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<p>The type of the parameter can optionally be specified if not deduced.</p>
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<dl class="section user"><dt>Examples:</dt><dd><div class="fragment"><div class="line"><span class="keywordtype">void</span> foo(<span class="keywordtype">int</span>, <span class="keywordtype">int</span>);</div><div class="line"><span class="comment">// single argument hiding ...</span></div><div class="line"><a class="code" href="group__hide.html#gaf2cefea3a99acd44f68121424103172d">sigc::hide</a>(&foo)(1,2,3); <span class="comment">// adds a dummy parameter at the back and calls foo(1,2)</span></div><div class="line"><a class="code" href="group__hide.html#gaf2cefea3a99acd44f68121424103172d">sigc::hide</a><-1>(&foo)(1,2,3); <span class="comment">// same as sigc::hide(&foo)(1,2,3) (calls foo(1,2))</span></div><div class="line">sigc::hide<0>(&foo)(1,2,3); <span class="comment">// adds a dummy parameter at the beginning and calls foo(2,3)</span></div><div class="line">sigc::hide<1>(&foo)(1,2,3); <span class="comment">// adds a dummy parameter in the middle and calls foo(1,3)</span></div><div class="line">sigc::hide<2>(&foo)(1,2,3); <span class="comment">// adds a dummy parameter at the back and calls foo(1,2)</span></div></div><!-- fragment --></dd></dl>
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<p>The functor <a class="el" href="group__hide.html#gaf2cefea3a99acd44f68121424103172d" title="Creates an adaptor of type sigc::hide_functor which adds a dummy parameter to the passed functor...">sigc::hide()</a> returns can be directly passed into <a class="el" href="classsigc_1_1signal7.html#adc55ac9b0f935fd87a67904022e03cb2" title="Add a slot to the list of slots. ">sigc::signal::connect()</a>.</p>
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<dl class="section user"><dt>Example:</dt><dd><div class="fragment"><div class="line"><a class="code" href="classsigc_1_1signal.html">sigc::signal<void,int></a> some_signal;</div><div class="line"><span class="keywordtype">void</span> foo();</div><div class="line">some_signal.<a class="code" href="classsigc_1_1signal7.html#adc55ac9b0f935fd87a67904022e03cb2">connect</a>(<a class="code" href="group__hide.html#gaf2cefea3a99acd44f68121424103172d">sigc::hide</a>(&foo));</div></div><!-- fragment --></dd></dl>
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<p><a class="el" href="group__hide.html#gaf2cefea3a99acd44f68121424103172d" title="Creates an adaptor of type sigc::hide_functor which adds a dummy parameter to the passed functor...">sigc::hide()</a> can be nested in order to discard multiple arguments. </p><dl class="section user"><dt>Example:</dt><dd><div class="fragment"><div class="line"><span class="comment">// multiple argument hiding ...</span></div><div class="line"><a class="code" href="group__hide.html#gaf2cefea3a99acd44f68121424103172d">sigc::hide</a>(<a class="code" href="group__hide.html#gaf2cefea3a99acd44f68121424103172d">sigc::hide</a>(& foo))(1,2,3,4); <span class="comment">// adds two dummy parameters at the back and calls foo(1,2)</span></div></div><!-- fragment --></dd></dl>
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<p><a class="el" href="group__hide.html#gae4e6f5491471c12440f1c5d480726b98" title="Creates an adaptor of type sigc::retype_return_functor which drops the return value of the passed fun...">sigc::hide_return()</a> alters an arbitrary functor by dropping its return value, thus converting it to a void functor. </p>
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<h2 class="groupheader">Function Documentation</h2>
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<a class="anchor" id="gaf2cefea3a99acd44f68121424103172d"></a>
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template <int I_location, class T_functor > </div>
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<td class="memname">hide_functor<I_location, T_functor> sigc::hide </td>
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<td>(</td>
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<td class="paramtype">const T_functor & </td>
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<td class="paramname"><em>_A_func</em></td><td>)</td>
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<p>Creates an adaptor of type <a class="el" href="structsigc_1_1hide__functor.html" title="Adaptor that adds a dummy parameter to the wrapped functor. ">sigc::hide_functor</a> which adds a dummy parameter to the passed functor. </p>
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<p>The optional template argument <em>I_location</em> specifies the zero-based position of the dummy parameter in the returned functor (<code>-1</code> stands for the last parameter).</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">_A_func</td><td>Functor that should be wrapped. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Adaptor that executes <em>_A_func</em>, ignoring the value of the dummy parameter. </dd></dl>
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template <class T_functor > </div>
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<td class="memname">hide_functor<-1, T_functor> sigc::hide </td>
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<td>(</td>
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<td class="paramtype">const T_functor & </td>
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<td class="paramname"><em>_A_func</em></td><td>)</td>
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<p>Creates an adaptor of type <a class="el" href="structsigc_1_1hide__functor.html" title="Adaptor that adds a dummy parameter to the wrapped functor. ">sigc::hide_functor</a> which adds a dummy parameter to the passed functor. </p>
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<p>This overload adds a dummy parameter at the back of the functor's parameter list.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">_A_func</td><td>Functor that should be wrapped. </td></tr>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>Adaptor that executes <em>_A_func</em>, ignoring the value of the last parameter. </dd></dl>
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<a class="anchor" id="gae4e6f5491471c12440f1c5d480726b98"></a>
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template <class T_functor > </div>
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<td class="memname">retype_return_functor<void, T_functor> sigc::hide_return </td>
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<td>(</td>
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<td class="paramtype">const T_functor & </td>
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<td class="paramname"><em>_A_functor</em></td><td>)</td>
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<p>Creates an adaptor of type <a class="el" href="structsigc_1_1retype__return__functor.html" title="Adaptor that performs a C-style cast on the return value of a functor. ">sigc::retype_return_functor</a> which drops the return value of the passed functor. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">_A_functor</td><td>Functor that should be wrapped. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Adaptor that executes <em>_A_functor</em> dropping its return value. </dd></dl>
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