ue.html" title="Struct template value">proto::result_of::value</a><span class="special">&lt;</span> <span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> 
    <a class="link" href="value.html#id-1_3_34_5_39_2_1_4_5_4_2-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><spa