ss="lineno">   81</span>&#160;        <span class="keyword">using</span> deref_t = color_convert_deref_fn&lt;typename std::iterator_traits&lt;InIterator&gt;::reference</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;                                      , <span class="keyword">typename</span> std::iterator_traits&lt;OutIterator&gt;::value_type <span class="comment">//reference?</span></div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;      