rd">void</span> <a class="link" href="../boost/function.html#boost.function.swap"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="../boost/function.html" title="Class template function">function</a><span class="special">&lt;</span><span class="identifier">Signature</span><span class="special">&gt;</span><span class="special">&amp;</span><span class="special">,</span> <a class="link" href="../boost/function.html" title="Class template function">function</a><span cl