pan> <span class="keywordtype">bool</span> P::is_mutable;</div><div class="line"></div><div class="line">    <span class="keyword">template</span> &lt;PixelConcept P2&gt; where { PixelConcept&lt;P, P2&gt; }</div><div class="line">        P::P(P2);</div><div class="line">    <span class="keyword">template</span> &lt;PixelConcept P2&gt; where { PixelConcept&lt;P, P2&gt; }</div><div class="line">        <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> P&amp;, <span class="key