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<div class="title">ColorBaseConcept&lt; ColorBase &gt; Struct Template Reference<div class="ingroups"><a class="el" href="group___color_base.html">ColorBase</a> &raquo; <a class="el" href="group___color_base_concept.html">Concepts</a></div></div>  </div>
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<p>A color base is a container of color elements (such as channels, channel references or channel pointers).  
 <a href="structboost_1_1gil_1_1_color_base_concept.html#details">More...</a></p>

<p><code>#include &lt;<a class="el" href="concepts_2color__base_8hpp_source.html">color_base.hpp</a>&gt;</code></p>
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void&#160;</td><td class="memItemRight" valign="bottom"><b>constraints</b> ()</td></tr>
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ColorBase&#160;</td><td class="memItemRight" valign="bottom"><b>cb</b></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template&lt;typename ColorBase&gt;<br />
struct boost::gil::ColorBaseConcept&lt; ColorBase &gt;</h3>

<p>A color base is a container of color elements (such as channels, channel references or channel pointers). </p>
<p>The most common use of color base is in the implementation of a pixel, in which case the color elements are channel values. The color base concept, however, can be used in other scenarios. For example, a planar pixel has channels that are not contiguous in memory. Its reference is a proxy class that uses a color base whose elements are channel references. Its iterator uses a color base whose elements are channel iterators.</p>
<p>A color base must have an associated layout (which consists of a color space, as well as an ordering of the channels). There are two ways to index the elements of a color base: A physical index corresponds to the way they are ordered in memory, and a semantic index corresponds to the way the elements are ordered in their color space. For example, in the RGB color space the elements are ordered as {<a class="el" href="structboost_1_1gil_1_1red__t.html" title="Red.">red_t</a>, <a class="el" href="structboost_1_1gil_1_1green__t.html" title="Green.">green_t</a>, <a class="el" href="structboost_1_1gil_1_1blue__t.html" title="Blue.">blue_t</a>}. For a color base with a BGR layout, the first element in physical ordering is the blue element, whereas the first semantic element is the red one. Models of <code><a class="el" href="structboost_1_1gil_1_1_color_base_concept.html" title="A color base is a container of color elements (such as channels, channel references or channel pointe...">ColorBaseConcept</a></code> are required to provide the <code>at_c&lt;K&gt;(ColorBase)</code> function, which allows for accessing the elements based on their physical order. GIL provides a <code>semantic_at_c&lt;K&gt;(ColorBase)</code> function (described later) which can operate on any model of <a class="el" href="structboost_1_1gil_1_1_color_base_concept.html" title="A color base is a container of color elements (such as channels, channel references or channel pointe...">ColorBaseConcept</a> and returns the corresponding semantic element.</p>
<div class="fragment"><div class="line">concept ColorBaseConcept&lt;typename T&gt; : CopyConstructible&lt;T&gt;, EqualityComparable&lt;T&gt;</div><div class="line">{</div><div class="line">    <span class="comment">// a GIL layout (the color space and element permutation)</span></div><div class="line">    <span class="keyword">typename</span> layout_t;</div><div class="line"></div><div class="line">    <span class="comment">// The type of K-th element</span></div><div class="line">    <span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K&gt;</div><div class="line">    <span class="keyword">struct </span>kth_element_type;</div><div class="line">        where Metafunction&lt;kth_element_type&gt;;</div><div class="line"></div><div class="line">    <span class="comment">// The result of at_c</span></div><div class="line">    <span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K&gt;</div><div class="line">    <span class="keyword">struct </span>kth_element_const_reference_type;</div><div class="line">        where Metafunction&lt;kth_element_const_reference_type&gt;;</div><div class="line"></div><div class="line">    <span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K&gt;</div><div class="line">    kth_element_const_reference_type&lt;T,K&gt;::type <a class="code" href="group___color_base_model_homogeneous.html#gae2eaf5eecbad94d7dc6432b8f759fba0">at_c</a>(T);</div><div class="line"></div><div class="line">    <span class="comment">// Copy-constructible and equality comparable with other compatible color bases</span></div><div class="line">    <span class="keyword">template</span> &lt;ColorBaseConcept T2&gt; where { ColorBasesCompatibleConcept&lt;T,T2&gt; }</div><div class="line">        T::T(T2);</div><div class="line">    <span class="keyword">template</span> &lt;ColorBaseConcept T2&gt; where { ColorBasesCompatibleConcept&lt;T,T2&gt; }</div><div class="line">        <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> T&amp;, <span class="keyword">const</span> T2&amp;);</div><div class="line">    <span class="keyword">template</span> &lt;ColorBaseConcept T2&gt; where { ColorBasesCompatibleConcept&lt;T,T2&gt; }</div><div class="line">        <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> T&amp;, <span class="keyword">const</span> T2&amp;);</div><div class="line">};</div></div><!-- fragment --> </div><hr/>The documentation for this struct was generated from the following file:<ul>
<li><a class="el" href="concepts_2color__base_8hpp_source.html">concepts/color_base.hpp</a></li>
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