 class="keyword">typename</span> <a class="link" href="../../../Expr.html" title="Concept Expr">Expr</a><span class="special">&gt;</span> 
  <span class="keyword">typename</span> <a class="link" href="../result_of/value.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"