&gt; Is there a solution?<br /><br />It appeared to me that the likely winner was: http://www.boost.org/doc/libs/1_37_0/doc/html/lambda/extending.html <br /><br />Then it seems we would use the boost array&#39;s typedef value_type to get the return type.  However, I do not see operator[] overloading in the list of supporting operators here.<br /><br />But the following code compiles:<br />	//Testing lambda and vectors/arrays.<br />	using lambda::_1;<br />	std::vector&lt;Real&gt; vec(1);<br />	vec[1] = 0;<br />	boost::function&lt;Real (std::vector&lt;Real&gt;)&gt; vec_f = _1[0]; //Returns the 0&#39;th element.<br /><br />Hence, it seems that this type of action is supported.  Any idea where the sourcecode for the std::vector lambda operators are?  might be useful to just copy/paste.<br /><br />Also, I wonder if there is any way to do this generically for all vector/array types supporting the Container concept? (I use a lot of ublas::vectors).  And if operator() is also supported, I use a lot of ublas::matrix as well, so this would be nice to have in lambda.<br /><br />Jesse