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    <p>Thank you so much. This solved my problem and I understand what double dispatch means! Here is the complete code for posterity (somebody please teach me how to get the formatting right):</p> <pre><code>#include &lt;iostream&gt; using namespace std; class BaseClass; class Derived1; class Derived2; class Derived3; class Processor { public: Processor(){} virtual void processObj(BaseClass* bc); virtual void processObj(Derived1* d1); virtual void processObj(Derived2* d2); }; class BaseClass{ public: BaseClass(){} virtual void ProcessThis(Processor &amp;p) { p.processObj(this); } virtual void myFunction(){cout &lt;&lt; "base myFunction called" &lt;&lt; endl;} }; class Derived1: public BaseClass{ public: Derived1():BaseClass(){} void ProcessThis(Processor &amp;p) { p.processObj(this); } void myFunction(){cout &lt;&lt; "Derived1 myFunction called" &lt;&lt; endl;} }; class Derived2: public BaseClass{ public: Derived2():BaseClass(){} void ProcessThis(Processor &amp;p) { p.processObj(this); } void myFunction(){cout &lt;&lt; "Derived2 myFunction called" &lt;&lt; endl;} }; class Derived3: public BaseClass{ public: Derived3():BaseClass(){} void ProcessThis(Processor &amp;p) { p.processObj(this); } void myFunction(){cout &lt;&lt; "Derived3 myFunction called" &lt;&lt; endl;} }; void Processor::processObj(BaseClass* bc){cout &lt;&lt; "got a base object" &lt;&lt; endl; bc-&gt;myFunction();} void Processor::processObj(Derived1* d1){cout &lt;&lt; "got a derived1 object" &lt;&lt; endl; d1-&gt;myFunction();} void Processor::processObj(Derived2* d2){cout &lt;&lt; "got a derived2 object" &lt;&lt; endl; d2-&gt;myFunction(); } int main() { BaseClass *bcp=new BaseClass(); Derived1 *dc1p=new Derived1(); Derived2 *dc2p=new Derived2(); Derived3 *dc3p=new Derived3(); Processor p;//can also use Processor* p = new Processor() //first set results bcp-&gt;ProcessThis(p); dc1p-&gt;ProcessThis(p); dc2p-&gt;ProcessThis(p); dc3p-&gt;ProcessThis(p); BaseClass *bcp1=bcp; BaseClass *dc1p1=dc1p; BaseClass *dc2p1=dc2p; BaseClass *dc3p1=dc3p; //second set results bcp1-&gt;ProcessThis(p); dc1p1-&gt;ProcessThis(p); dc2p1-&gt;ProcessThis(p); dc3p1-&gt;ProcessThis(p); Processor p2; bcp1-&gt;ProcessThis(p2); dc1p1-&gt;ProcessThis(p2); dc2p1-&gt;ProcessThis(p2); dc3p1-&gt;ProcessThis(p2); return 0; } </code></pre>
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    1. PODouble dispatch/multimethods in C++
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    1. UScppalphadev
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