a.html#cit:boost::ref" title="Boost ref">[<abbr class="abbrev">ref</abbr>]</a>.

Wrapping an argument with <code class="literal">ref</code>, or <code class="literal">cref</code>, 
instructs the library to store the argument as a reference, 
or as a reference to const respectively.

For example, if we rewrite the previous example and wrap the variable 
<code class="literal">i</code> with <code class="literal">ref</code>, 
we are creating the lambda expression <code class="literal">lambda x.(x = 2, x + i)</co