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    <p>The code below is a minimal working example of what you requested. <code>ClassA</code> emits two signals; <code>SigA</code> sends (and accepts) no parameters, <code>SigB</code> sends an <code>int</code>. <code>ClassB</code> has two functions which will output to <code>cout</code> when each function is called. In the example there is one instance of <code>ClassA</code> (<code>a</code>) and two of <code>ClassB</code> (<code>b</code> and <code>b2</code>). <code>main</code> is used to connect and fire the signals. It's worth noting that <code>ClassA</code> and <code>ClassB</code> know nothing of each other (ie they're not <em>compile-time bound</em>).</p> <pre><code>#include &lt;boost/signal.hpp&gt; #include &lt;boost/bind.hpp&gt; #include &lt;iostream&gt; using namespace boost; using namespace std; struct ClassA { signal&lt;void ()&gt; SigA; signal&lt;void (int)&gt; SigB; }; struct ClassB { void PrintFoo() { cout &lt;&lt; "Foo" &lt;&lt; endl; } void PrintInt(int i) { cout &lt;&lt; "Bar: " &lt;&lt; i &lt;&lt; endl; } }; int main() { ClassA a; ClassB b, b2; a.SigA.connect(bind(&amp;ClassB::PrintFoo, &amp;b)); a.SigB.connect(bind(&amp;ClassB::PrintInt, &amp;b, _1)); a.SigB.connect(bind(&amp;ClassB::PrintInt, &amp;b2, _1)); a.SigA(); a.SigB(4); } </code></pre> <p>The output:</p> <pre> Foo Bar: 4 Bar: 4 </pre> <p>For brevity I've taken some shortcuts that you wouldn't normally use in production code (in particular access control is lax and you'd normally 'hide' your signal registration behind a function like in KeithB's example). </p> <p>It seems that most of the difficulty in <code>boost::signal</code> is in getting used to using <code>boost::bind</code>. It <em>is</em> a bit mind-bending at first! For a trickier example you could also use <code>bind</code> to hook up <code>ClassA::SigA</code> with <code>ClassB::PrintInt</code> even though <code>SigA</code> does <em>not</em> emit an <code>int</code>:</p> <pre><code>a.SigA.connect(bind(&amp;ClassB::PrintInt, &amp;b, 10)); </code></pre> <p>Hope that helps!</p>
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    1. POComplete example using Boost::Signals for C++ Eventing
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    1. COIs it possible to overload a function, and if so, would you mind adding that. s.t. you have something like PrintNum(int); and PrintNum(float);
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    2. CO@pyInTheSky Use a function type (not sure of the exact term): `(void (*)(int))&PrintNum`
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