left_assign.html" title="Struct shift_left_assign">proto::tag::shift_left_assign</a><span class="special">,</span> <a class="link" href="listN.html" title="Struct template listN">proto::list2</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">&gt;</span> <span class="special">&gt;</span>       <a name="boost.proto.shift_left_assign.type"></a><span class="identifier">type</span><span class="special">;</s