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    <p><strong>Edit</strong><br> Okay, after rethinking everything, the problem lies with <code>ListenerBase&lt;MyClass, Button&gt;</code> and <code>ListenerBase&lt;MyClass, Label&gt;</code> each defining an <code>addHandler</code> function, which because of inheritance doesn't seem to count as overloading, even though they have different signatures (one with a <code>Button*</code> parameter, the other with a <code>Label*</code> one). One possible fix I found for this is to fully qualify the call to <code>addHandler</code>, a bit verbose and maybe not what was really desired, but it works (for convenience, I <code>typedef</code>'d the base classes):</p> <pre><code>template&lt;class Type&gt; class ButtonListenerHandler : public ListenerBase&lt;Type, Button&gt;{ public: typedef ListenerBase&lt;Type, Button&gt; ButtonListenerBase; }; template&lt;class Type&gt; class LabelListenerHandler : public ListenerBase&lt;Type, Label&gt;{ public: typedef ListenerBase&lt;Type, Label&gt; LabelListenerBase; }; class MyClass : public ButtonListenerHandler&lt;MyClass&gt;, public LabelListenerHandler&lt;MyClass&gt;{ public: void buttonHandlerFunction(); void labelHandlerFunction(); MyClass(){ ButtonListenerHandler&lt;MyClass&gt;::addHandler(m_btn, &amp;MyClass::buttonHandlerFunction); LabelListenerHandler&lt;MyClass&gt;::addHandler(m_label, &amp;MyClass::labelHandlerFunction); } private: Button* m_btn; Label* m_label; }; </code></pre> <p><strong>'nother Edit</strong><br> Thanks to the fast answer to <a href="https://stackoverflow.com/questions/5368862/why-do-multiple-inherited-functions-with-same-name-but-different-signatures-not-g">my question here</a>, I can give it another edit. The <code>using</code> method mentioned there also applies to your problem. :)</p> <pre><code>class MyClass : public ButtonListenerHandler&lt;MyClass&gt;, public LabelListenerHandler&lt;MyClass&gt;{ public: using ButtonListenerHandler&lt;MyClass&gt;::addHandler; using LabelListener&lt;MyClass&gt;::addHandler; void buttonHandlerFunction(){ } void labelHandlerFunction(){ } MyClass(){ addHandler(m_btn, &amp;MyClass::buttonHandlerFunction); addHandler(m_label, &amp;MyClass::labelHandlerFunction); } private: Button* m_btn; Label* m_label; }; </code></pre>
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    1. POTemplated "Listener" handler ambiguity problem
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    1. COListenerBase is instantiated with different template arguments - they're different classes. Widget::Listener is the doubly inherited class.
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    2. CO@Erik: You're right, that was me acting a little too fast... let me overthink this one.
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    3. CO@Erik: Updated, and funny enough, problem lies with exactly what you said "ListenerBase is instantiated with different template arguments - they're different classes.". :)
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