="link" href="../boost/function.html#id-1_3_17_6_2_1_4_32_2_4-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span>reference_wrapper<span class="special">&lt;</span><span class="identifier">Functor</span><span class="special">&gt;</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="../boost/function.html" title="Class template function">function</a><span class="special">&lt;</span><span class="identifier">Signatur