e></a> for which always
      requiring the extra parenthesis <code class="computeroutput"><span class="special">((...))</span></code>
      around the types would lead to an unnatural syntax for the local function signature:
    </p><pre class="programlisting"><span class="keyword">int</span> <span class="identifier">BOOST_LOCAL_FUNCTION</span><span class="special">(</span> <span class="special">((</span><span class="keyword">int</span><span class="special">&amp;))</span> <span class="identifier">x</span><