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#include <stdio.h>typedef const char EventArgs;class EventCallback{public:    virtual ~EventCallback () {}    virtual bool operator () (EventArgs *evargs) = 0;};class EventMethodCallback : public EventCallback{    bool (*callback) (void *self, EventArgs *evargs);    void *self;public:    template <class T>    EventMethodCallback (bool (T::*f) (EventArgs *), T *_self)    {        callback = (bool (*) (void *, EventArgs *)) *((void **)&f);        self = _self;    }    virtual bool operator () (EventArgs *evargs)    {        return callback (self, evargs);    }};void invoke_event (EventCallback *ec){    bool rc = (*ec) ("abcdef");    printf ("rc = %d\n", rc);}// test classclass X{    int a, b;public:    X ()    {        a = 123;        b = 456;    }    bool callback (EventArgs *evargs)    {        printf ("Callback: a=%d b=%d args=%s\n", a, b, evargs);        return true;    }} x;int main (){    EventCallback *ec = new EventMethodCallback (&X::callback, &x);    invoke_event (ec);    delete ec;    return 0;}/*Results:[3|zap@zap|~/eeeeeeee]./testCallback: a=123 b=456 args=abcdefrc = 1*/