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    <p>It is quite tricky to generalize this syntax based on overloading the <code>operator,</code> operator, and the result looks awkward at best (if it works). I would recommend trying other options (eg. go for the <a href="http://eigen.tuxfamily.org/dox/classEigen_1_1DenseBase.html#a3dacded5374fe30f8d4eb4ae18bc87c9" rel="nofollow"><code>MatrixBase::operator&lt;&lt;(DenseBase&amp;)</code></a> operator).</p> <p>If you want it still, you must unpack the scalars one-by-one:</p> <pre><code>template&lt;typename T1, typename T2, class CI, int Current, int Height&gt; inline void gather (Array&lt;T1,Height,1&gt; &amp;to, const Array&lt;T2,Dynamic,1&gt; &amp;from, const Array&lt;int,Height,1&gt; &amp;index, CI&amp;&amp; ci, std::integral_constant&lt;int, Current&gt;*) { gather(to, from, index, (ci,from[index[Current]]), (std::integral_constant&lt;int, Current+1&gt;*)0); } template&lt;typename T1, typename T2, class CI, int Height&gt; inline void gather (Array&lt;T1,Height,1&gt; &amp;to, const Array&lt;T2,Dynamic,1&gt; &amp;from, const Array&lt;int,Height,1&gt; &amp;index, CI&amp;&amp; ci, std::integral_constant&lt;int, Height&gt;*) {} template&lt;typename T1, typename T2, int Height&gt; inline void gather (Array&lt;T1,Height,1&gt; &amp;to, const Array&lt;T2,Dynamic,1&gt; &amp;from, const Array&lt;int,Height,1&gt; &amp;index) { gather(to, from, index, (to &lt;&lt; index[from[0]]), (std::integral_constant&lt;int, 1&gt;*)0); } </code></pre> <p>Ugly, and there may be problems (you need to handle the <code>Dynamic</code> value, zero height if that's possible, there may be problems passing <code>CommaInitializers</code> to the recursion etc.)</p> <p>Plus, it has linear template instantiation depth (and IMHO that's unavoidable in this case).</p>
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    1. CO@jplacek Zero elements is not an issue - I edited my question. I agree, it is ugly :-) On top of that, I have only a faint clue about what it actually does.
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