emplate</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> U<span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="shift_left_assign.html" title="Struct template shift_left_assign">shift_left_assign</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="transform.html" title="Struct template transform">proto::transform</a><span class="special">