 class="special">{</span>
    <span class="comment">// types</span>
    <span class="keyword">typedef</span> <span class="identifier">remove_reference</span><span class="special">&lt;</span> <span class="identifier">Sub</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span><span class="special">::</span><span class="identifier">string_type</span> <a class="link" href="str/resu_1_3_47_5_3_2_1_2_15_3.html#boost.xpressive.op.str.resu_1_3_47_5_3_2_1_2_15_3.ty