ansform_impl</a>&lt;Expr, State, Data&gt; <span class="special">{</span>
    <span class="comment">// types</span>
    <span class="keyword">typedef</span> <span class="identifier">Expr</span> <a class="link" href="not_/impl.html#boost.proto.not_.impl.result_type"><span class="identifier">result_type</span></a><span class="special">;</span>

    <span class="comment">// <a class="link" href="not_/impl.html#id-1_3_33_5_32_2_1_2_5_4-bb">public member functions</a></span>
    <span class="identifier">Expr</spa