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<title>Struct template accumulator_set</title>
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<div class="refentry">
<a name="boost.accumulators.accumulator_set"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Struct template accumulator_set</span></h2>
<p>boost::accumulators::accumulator_set &#8212; A set of accumulators. </p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../accumulators/reference.html#header.boost.accumulators.accumulators_fwd_hpp" title="Header &lt;boost/accumulators/accumulators_fwd.hpp&gt;">boost/accumulators/accumulators_fwd.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Sample<span class="special">,</span> <span class="keyword">typename</span> Features<span class="special">,</span> <span class="keyword">typename</span> Weight <span class="special">=</span> <span class="keyword">void</span><span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="accumulator_set.html" title="Struct template accumulator_set">accumulator_set</a> <span class="special">{</span>
  <span class="comment">// <a class="link" href="accumulator_set.html#boost.accumulators.accumulator_setconstruct-copy-destruct">construct/copy/destruct</a></span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A1<span class="special">&gt;</span> <span class="keyword">explicit</span> <a class="link" href="accumulator_set.html#idp33114280-bb"><span class="identifier">accumulator_set</span></a><span class="special">(</span><span class="identifier">A1</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="accumulator_set.html#idp33104856-bb">public member functions</a></span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> UnaryFunction<span class="special">&gt;</span> <span class="keyword">void</span> <a class="link" href="accumulator_set.html#idp33105064-bb"><span class="identifier">visit</span></a><span class="special">(</span><span class="identifier">UnaryFunction</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> FilterPred<span class="special">,</span> <span class="keyword">typename</span> UnaryFunction<span class="special">&gt;</span> 
    <span class="keyword">void</span> <a class="link" href="accumulator_set.html#idp33106760-bb"><span class="identifier">visit_if</span></a><span class="special">(</span><span class="identifier">UnaryFunction</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="accumulator_set.html#idp33108808-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A1<span class="special">&gt;</span> <span class="keyword">void</span> <a class="link" href="accumulator_set.html#idp33109480-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">A1</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Feature<span class="special">&gt;</span> apply<span class="special">&lt;</span> <span class="identifier">Feature</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <span class="special">&amp;</span> <a class="link" href="accumulator_set.html#idp33110696-bb"><span class="identifier">extract</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Feature<span class="special">&gt;</span> apply<span class="special">&lt;</span> <span class="identifier">Feature</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <span class="keyword">const</span> <span class="special">&amp;</span> <a class="link" href="accumulator_set.html#idp33111880-bb"><span class="identifier">extract</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Feature<span class="special">&gt;</span> <span class="keyword">void</span> <a class="link" href="accumulator_set.html#idp33113256-bb"><span class="identifier">drop</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp52317352"></a><h2>Description</h2>
<p><a class="link" href="accumulator_set.html" title="Struct template accumulator_set">accumulator_set</a> resolves the dependencies between features and ensures that the accumulators in the set are updated in the proper order.</p>
<p>acccumulator_set provides a general mechanism to visit the accumulators in the set in order, with or without a filter. You can also fetch a reference to an accumulator that corresponds to a feature. </p>
<div class="refsect2">
<a name="idp52318600"></a><h3>
<a name="boost.accumulators.accumulator_setconstruct-copy-destruct"></a><code class="computeroutput">accumulator_set</code> 
        public
       construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A1<span class="special">&gt;</span> <span class="keyword">explicit</span> <a name="idp33114280-bb"></a><span class="identifier">accumulator_set</span><span class="special">(</span><span class="identifier">A1</span> <span class="keyword">const</span> <span class="special">&amp;</span> a1<span class="special">)</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.</p>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">a1</code></span></p></td>
<td><p>Optional named parameter to be passed to all the accumulators </p></td>
</tr></tbody>
</table></div></td>
</tr></tbody>
</table></div>
</li></ol></div>
</div>
<div class="refsect2">
<a name="idp52326120"></a><h3>
<a name="idp33104856-bb"></a><code class="computeroutput">accumulator_set</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> UnaryFunction<span class="special">&gt;</span> <span class="keyword">void</span> <a name="idp33105064-bb"></a><span class="identifier">visit</span><span class="special">(</span><span class="identifier">UnaryFunction</span> <span class="keyword">const</span> <span class="special">&amp;</span> func<span class="special">)</span><span class="special">;</span></pre>
<p>Visitation 
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">func</code></span></p></td>
<td><p>UnaryFunction which is invoked with each accumulator in turn. </p></td>
</tr></tbody>
</table></div></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> FilterPred<span class="special">,</span> <span class="keyword">typename</span> UnaryFunction<span class="special">&gt;</span> 
  <span class="keyword">void</span> <a name="idp33106760-bb"></a><span class="identifier">visit_if</span><span class="special">(</span><span class="identifier">UnaryFunction</span> <span class="keyword">const</span> <span class="special">&amp;</span> func<span class="special">)</span><span class="special">;</span></pre>
<p>Conditional visitation 
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">func</code></span></p></td>
<td><p>UnaryFunction which is invoked with each accumulator in turn, provided the accumulator satisfies the MPL predicate FilterPred. </p></td>
</tr></tbody>
</table></div></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp33108808-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Accumulation 
</p>
</li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A1<span class="special">&gt;</span> <span class="keyword">void</span> <a name="idp33109480-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">A1</span> <span class="keyword">const</span> <span class="special">&amp;</span> a1<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Feature<span class="special">&gt;</span> apply<span class="special">&lt;</span> <span class="identifier">Feature</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <span class="special">&amp;</span> <a name="idp33110696-bb"></a><span class="identifier">extract</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Extraction. </li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Feature<span class="special">&gt;</span> apply<span class="special">&lt;</span> <span class="identifier">Feature</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <span class="keyword">const</span> <span class="special">&amp;</span> <a name="idp33111880-bb"></a><span class="identifier">extract</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Feature<span class="special">&gt;</span> <span class="keyword">void</span> <a name="idp33113256-bb"></a><span class="identifier">drop</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Drop. </li>
</ol></div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2005, 2006 Eric Niebler<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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