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<!DOCTYPE html>
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<title>dip::Feature::Composite class | DIPlib | a library for quantitative image analysis</title>
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<h1>
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<a href="measurement.html" class="m-doc">Measurement</a> module<br/><span class="m-code m-thin">#include <a href="file--diplib--measurement-h.html">"diplib/measurement.h"</a></span> </div>
<span class="m-breadcrumb"><a href="dip.html">dip</a>::<wbr/></span><span class="m-breadcrumb"><a href="dip-Feature.html">Feature</a>::<wbr/></span>Composite <span class="m-thin">class</span> </h1>
<p>The abstract base class for all composite measurement features.</p>
<div class="m-block m-default">
<h3>Contents</h3>
<ul>
<li>
Reference
<ul>
<li><a href="#base-classes">Base classes</a></li>
<li><a href="#function-members">Functions</a></li>
</ul>
</li>
</ul>
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<p>To define a composite measurement feature, derive from this class and override all the pure vitrual functions,
including the ones from <a href="dip-Feature-Base.html"><code>dip::Feature::Base</code></a>. See the existing composite features in <code>/src/measurement/</code> for examples.</p>
<section id="base-classes">
<h2>Base classes</h2>
<dl class="m-doc">
<dt>
class <a href="dip-Feature-Base.html" class="m-doc">dip::<wbr />Feature::<wbr />Base</a> <span class="m-label m-flat m-warning">abstract</span>
</dt>
<dd>The abstract base class for all measurement features.</dd>
</dl>
</section>
<section id="function-members">
<h2>Functions</h2>
<dl class="m-doc">
<dt>
<span class="m-doc-wrap-bumper">auto <a href="#dip-Feature-Composite-Dependencies" class="m-doc">Dependencies</a>(</span><span class="m-doc-wrap">) -> <a href="supporttypes.html#dip-StringArray" class="m-doc">dip::StringArray</a> <span class="m-label m-flat m-warning">pure virtual</span></span>
</dt>
<dd>Lists the features that the measurement depends on. These features will be computed and made
available to the <code>Measure</code> method. This function is always called after <a href="dip-Feature-Base.html#dip-Feature-Base-Initialize-Image-CL-Image-CL-dip-uint-"><code>dip::Feature::Base::Initialize</code></a>. <a href="#dip-Feature-Composite-Dependencies">more...</a></dd>
<dt id="dip-Feature-Composite-Compose-Measurement-IteratorObject-L-Measurement-ValueIterator-">
<span class="m-doc-wrap-bumper">void <a href="#dip-Feature-Composite-Compose-Measurement-IteratorObject-L-Measurement-ValueIterator-" class="m-doc-self">Compose</a>(</span><span class="m-doc-wrap"><a href="dip-Measurement-IteratorObject.html" class="m-doc">dip::Measurement::IteratorObject</a>& dependencies,
<a href="dip-Measurement.html#dip-Measurement-ValueIterator" class="m-doc">dip::Measurement::ValueIterator</a> output) <span class="m-label m-flat m-warning">pure virtual</span></span>
</dt>
<dd>Called once for each object, the input <code>dependencies</code> object contains the measurements
for the object from all the features in the <a href="dip-Feature-Composite.html#dip-Feature-Composite-Dependencies"><code>dip::Feature::Composite::Dependencies</code></a> list.</dd>
</dl>
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<section>
<h2>Function documentation</h2>
<section class="m-doc-details" id="dip-Feature-Composite-Dependencies"><div>
<h3>
<span class="m-doc-wrap-bumper"><a href="supporttypes.html#dip-StringArray" class="m-doc">dip::StringArray</a>
</span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#dip-Feature-Composite-Dependencies" class="m-doc-self">Dependencies</a>(</span><span class="m-doc-wrap">) <span class="m-label m-warning">pure virtual</span></span></span>
</h3>
<p>Lists the features that the measurement depends on. These features will be computed and made
available to the <code>Measure</code> method. This function is always called after <a href="dip-Feature-Base.html#dip-Feature-Base-Initialize-Image-CL-Image-CL-dip-uint-"><code>dip::Feature::Base::Initialize</code></a>.</p>
<aside class="m-note m-info">
<h4>Attention</h4>
<p>Dependency chains are currently not supported. Dependencies listed here should not be
other <code>Type::COMPOSITE</code> features. This would require processing the composite features in the
right order for all dependencies to be present when needed.</p>
</aside>
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