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<title>libsigc++: sigc::signal< T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6, T_arg7 >::accumulated< T_accumulator > Class Template Reference</title>
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<div class="navpath"><a class="el" href="namespacesigc.html">sigc</a>::<a class="el" href="classsigc_1_1signal.html">signal</a>::<a class="el" href="classsigc_1_1signal_1_1accumulated.html">accumulated</a>
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<h1>sigc::signal< T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6, T_arg7 >::accumulated< T_accumulator > Class Template Reference<br/>
<small>
[<a class="el" href="group__signal.html">Signals</a>]</small>
</h1><!-- doxytag: class="sigc::signal::accumulated" --><!-- doxytag: inherits="sigc::signal7" -->
<p>Convenience wrapper for the numbered <a class="el" href="classsigc_1_1signal.html" title="Convenience wrapper for the numbered sigc::signal# templates.">sigc::signal</a># templates. <a href="#_details">More...</a></p>
<p><code>#include <sigc++/signal.h></code></p>
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Inheritance diagram for sigc::signal< T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6, T_arg7 >::accumulated< T_accumulator >:</div>
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<p><a href="classsigc_1_1signal_1_1accumulated-members.html">List of all members.</a></p>
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<tr><td colspan="2"><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a032428476a190d9dea6313f70e5b8a10"></a><!-- doxytag: member="sigc::signal::accumulated::accumulated" ref="a032428476a190d9dea6313f70e5b8a10" args="(const accumulated &src)" -->
 </td><td class="memItemRight" valign="bottom"><b>accumulated</b> (const <a class="el" href="classsigc_1_1signal_1_1accumulated.html">accumulated</a>& src)</td></tr>
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<hr/><a name="_details"></a><h2>Detailed Description</h2>
<h3>template <class T_return, class T_arg1 = nil, class T_arg2 = nil, class T_arg3 = nil, class T_arg4 = nil, class T_arg5 = nil, class T_arg6 = nil, class T_arg7 = nil><br/>
template <class T_accumulator><br/>
class sigc::signal< T_return, T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6, T_arg7 >::accumulated< T_accumulator ></h3>
<p>Convenience wrapper for the numbered <a class="el" href="classsigc_1_1signal.html" title="Convenience wrapper for the numbered sigc::signal# templates.">sigc::signal</a># templates. </p>
<p>Like <a class="el" href="classsigc_1_1signal.html" title="Convenience wrapper for the numbered sigc::signal# templates.">sigc::signal</a> but the additional template parameter <em>T_accumulator</em> defines the accumulator type that should be used.</p>
<p>An accumulator is a functor that uses a pair of special iterators to step through a list of slots and calculate a return value from the results of the <a class="el" href="classsigc_1_1slot.html" title="Convenience wrapper for the numbered sigc::slot# templates.">slot</a> invokations. The iterators' <a class="elRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01143.html#ga547f511a7a33f8780e230af2fc64e34b">operator*()</a> executes the <a class="el" href="classsigc_1_1slot.html" title="Convenience wrapper for the numbered sigc::slot# templates.">slot</a>. The return value is buffered, so that in an expression like </p>
<div class="fragment"><pre class="fragment"> a = (*i) * (*i); </pre></div><p> the <a class="el" href="classsigc_1_1slot.html" title="Convenience wrapper for the numbered sigc::slot# templates.">slot</a> is executed only once. The accumulator must define its return value as <code>result_type</code>.</p>
<dl class="user"><dt><b>Example 1:</b></dt><dd>This accumulator calculates the arithmetic mean value: <div class="fragment"><pre class="fragment"> <span class="keyword">struct </span>arithmetic_mean_accumulator
{
<span class="keyword">typedef</span> <span class="keywordtype">double</span> result_type;
<span class="keyword">template</span><<span class="keyword">typename</span> T_iterator>
result_type <a class="code" href="classsigc_1_1signal7.html#a11b73bd2c5d40e02eab78b38ce0d097d" title="Triggers the emission of the signal (see emit()).">operator()</a>(T_iterator first, T_iterator last)<span class="keyword"> const</span>
<span class="keyword"> </span>{
result_type value_ = 0;
<span class="keywordtype">int</span> n_ = 0;
<span class="keywordflow">for</span> (; first != last; ++first, ++n_)
value_ += *first;
<span class="keywordflow">return</span> value_ / n_;
}
};
</pre></div></dd></dl>
<dl class="user"><dt><b>Example 2:</b></dt><dd>This accumulator stops <a class="el" href="classsigc_1_1signal.html" title="Convenience wrapper for the numbered sigc::signal# templates.">signal</a> emission when a <a class="el" href="classsigc_1_1slot.html" title="Convenience wrapper for the numbered sigc::slot# templates.">slot</a> returns zero: <div class="fragment"><pre class="fragment"> <span class="keyword">struct </span>interruptable_accumulator
{
<span class="keyword">typedef</span> <span class="keywordtype">bool</span> result_type;
<span class="keyword">template</span><<span class="keyword">typename</span> T_iterator>
result_type <a class="code" href="classsigc_1_1signal7.html#a11b73bd2c5d40e02eab78b38ce0d097d" title="Triggers the emission of the signal (see emit()).">operator()</a>(T_iterator first, T_iterator last)<span class="keyword"> const</span>
<span class="keyword"> </span>{
<span class="keywordflow">for</span> (; first != last; ++first, ++n_)
<span class="keywordflow">if</span> (!*first) <span class="keywordflow">return</span> <span class="keyword">false</span>;
<span class="keywordflow">return</span> <span class="keyword">true</span>;
}
};
</pre></div> </dd></dl>
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