er">complex</span><span class="special">&gt;</span>
    <span class="special">{</span>
        <span class="keyword">typedef</span> <span class="identifier">proto</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deep_copy</span><span class="special">&lt;</span>
            <span class="identifier">BOOST_TYPEOF</span><span class="special">(</span><span class="char">'{'</span> <span class="special">&lt;&lt;</span> <span class