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<h1>Lambdas</h1>
<p>libsigc++ ships with basic <a class="el" href="structsigc_1_1lambda.html" title="Lambda type.">lambda</a> functionality and the sigc::group adaptor that uses lambdas to transform a functor's parameter list. <a href="#_details">More...</a></p>
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<tr><td class="memItemLeft" align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1lambda__base.html">sigc::lambda_base</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A hint to the compiler. <a href="structsigc_1_1lambda__base.html#_details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1lambda.html">sigc::lambda< T_type ></a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Lambda type. <a href="structsigc_1_1lambda.html#_details">More...</a><br/></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__group__.html">group()</a></td></tr>
<p><tr><td class="mdescLeft"> </td><td class="mdescRight"><p>sigc::group() alters an arbitrary functor by rebuilding its arguments from one or more lambda expressions. </p>
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<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>libsigc++ ships with basic <a class="el" href="structsigc_1_1lambda.html" title="Lambda type.">lambda</a> functionality and the sigc::group adaptor that uses lambdas to transform a functor's parameter list. </p>
<p>The <a class="el" href="structsigc_1_1lambda.html" title="Lambda type.">lambda</a> selectors sigc::_1, sigc::_2, ..., sigc::_9 are used to select the first, second, ..., nineth argument from a list.</p>
<dl class="user"><dt><b>Examples:</b></dt><dd><div class="fragment"><pre class="fragment"> <a class="codeRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01116.html#aaf93fdf0812752e0e02c501dea1b38f0">std::cout</a> << sigc::_1(10,20,30); <span class="comment">// returns 10</span>
<a class="codeRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01116.html#aaf93fdf0812752e0e02c501dea1b38f0">std::cout</a> << sigc::_2(10,20,30); <span class="comment">// returns 20</span>
...
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<p>Operators are defined so that <a class="el" href="structsigc_1_1lambda.html" title="Lambda type.">lambda</a> selectors can be used e.g. as placeholders in arithmetic expressions.</p>
<dl class="user"><dt><b>Examples:</b></dt><dd><div class="fragment"><pre class="fragment"> <a class="codeRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01116.html#aaf93fdf0812752e0e02c501dea1b38f0">std::cout</a> << (sigc::_1 + 5)(3); <span class="comment">// returns (3 + 5)</span>
<a class="codeRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01116.html#aaf93fdf0812752e0e02c501dea1b38f0">std::cout</a> << (sigc::_1 * sigc::_2)(7,10); <span class="comment">// returns (7 * 10)</span>
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<hr size="1"/><address style="text-align: right;"><small>Generated on Tue May 4 21:44:39 2010 for libsigc++ by 
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