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POC++ class member callback simple examples
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  1. POC++ class member callback simple examples
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    copied!<p>I know this has been asked so many times, and because of that it's difficult to dig through the cruft and find a simple example of what works.</p> <p>I've got this, it's simple and it works for <code>MyClass</code>...</p> <pre><code>#include &lt;iostream&gt; using std::cout; using std::endl; class MyClass { public: MyClass(); static void Callback(MyClass* instance, int x); private: int private_x; }; class EventHandler { public: void addHandler(MyClass* owner) { cout &lt;&lt; "Handler added..." &lt;&lt; endl; //Let's pretend an event just occured owner-&gt;Callback(owner,1); } }; EventHandler* handler; MyClass::MyClass() { private_x = 5; handler-&gt;addHandler(this); } void MyClass::Callback(MyClass* instance, int x) { cout &lt;&lt; x + instance-&gt;private_x &lt;&lt; endl; } int main(int argc, char** argv) { handler = new EventHandler(); MyClass* myClass = new MyClass(); } class YourClass { public: YourClass(); static void Callback(YourClass* instance, int x); }; </code></pre> <p>How can that be rewritten so <code>EventHandler::addHandler()</code> will work with both <code>MyClass</code> and <code>YourClass</code>. I'm sorry but it's just the way my brain works, I need to see a simple example of what works before I can comprehend why/how it works. If you've got a favorite way to make this work now's the time to show it off, please markup that code and post it back.</p> <p><strong>[edit]</strong></p> <p>It was answered but the answer was deleted before I could give the checkmark. The answer in my case was a templated function. Changed addHandler to this...</p> <pre><code>class EventHandler { public: template&lt;typename T&gt; void addHandler(T* owner) { cout &lt;&lt; "Handler added..." &lt;&lt; endl; //Let's pretend an event just occured owner-&gt;Callback(owner,1); } }; </code></pre>
 

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