pecializations in lambda expressions:</p>
<pre class="literal-block">
// trivial std::vector generator
template&lt;class U&gt; 
struct make_vector { typedef std::vector&lt;U&gt; type; };

typedef mpl::apply&lt;<strong>make_vector&lt;_&gt;</strong>, T&gt;::type vector_of_t;
</pre>
<p>Instead, we can simply write:</p>
<pre class="literal-block">
typedef mpl::apply&lt;<strong>std::vector&lt;_&gt;</strong>, T&gt;::type vector_of_t;
</pre>
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