el&gt; <span class="keywordtype">void</span> check_compatible()<span class="keyword"> const </span>{ gil_function_requires&lt;PixelsCompatibleConcept&lt;Pixel,pixel&gt; &gt;(); }
<a name="l00141"></a>00141 
<a name="l00142"></a>00142 <span class="comment">// Support for assignment/equality comparison of a channel with a grayscale pixel</span>
<a name="l00143"></a>00143 
<a name="l00144"></a>00144 <span class="keyword">private</span>:
<a name="l00145"></a>00145     <span class="keyword">static</span> <span c