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POcalling function pointer of a member function from a function pointer vector
 

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  1. POcalling function pointer of a member function from a function pointer vector
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    <p>i think this is mostly a syntax error ( though not captured during compilation, only at runtime does the error happen)</p> <p>i am trying to develop an event driven architecture , where i keep a vector of eventReceiver and try to call them from the vector.</p> <p><strong>CommonIO.h</strong></p> <pre><code> class CommonIO { public: typedef void (*incomingMsgReceiver)(char*); void registerForIncomingMsg(incomingMsgReceiver); void incomingMsgReceived(char*); } </code></pre> <p><strong>CommonIO.cpp</strong></p> <pre><code> std::vector&lt;void (*)(char*)&gt; listeners; void CommonIO::registerForIncomingMsg(incomingMsgReceiver receiverFunction) { listeners.push_back(receiverFunction); } void CommonIO::incomingMsgReceived(char* buf) { for (unsigned int j = 0; j &lt; listeners.size(); j++) { listeners[i](buf); //error, segmentation fault..how do i call it? } } </code></pre> <p><strong>Main.h</strong></p> <pre><code>class Main { public: static void msgReceived(char*); void mainLoop(); } </code></pre> <p><strong>Main.cpp</strong></p> <pre><code>void Main::msgReceived(char* msg) { printf("\n\n ---------&gt;&gt;&gt;&gt;&gt; %s \n\n" , msg); } void Main::mainLoop() { CommonIO::incomingMsgReceiver receiver = &amp;Main::msgReceived; CommonIO::getInstance()-&gt;registerForIncomingMsg( receiver ); } </code></pre> <p>incomingMsgReceived function is called by an asynchronous process</p> <p>the program compiles fine..however breaks down at : listenersi; line. what is the proper syntax for this ? </p>
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    1. USShrouk Khan
    1. USShrouk Khan
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    1. COI've no idea how you can get a segmentation fault inside `CommonIO::incomingMsgReceived` when this function is never called.
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      1. USCB Bailey
    2. COI don't believe that's your real code (what is `i`?). Please consider creating an [SSCCE](http://sscce.org).
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      1. USOliver Charlesworth
    3. COIn your `incomingMsgReceived`, what's the name of the argument, where does `buf` come from, and why does it need casting?
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      1. USDCoder
 

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