[duane]

The technique is to create a static function in your class. The first parameter to your function is this. In the function, dispatch to the member function using the this pointer. This technique is a kind of a thunk.

class MyClass
{
  private:
    static void sProcessTask(MyClass* self, int someParam);
    void DispatchTask();
    void ProcessTask();
}

void MyClass::sProcessTask(MyClass* self, int someParam)
{
  self.ProcessTask(someParam);
}

void MyClass::DispatchTask()
{
  Task myTask = new Task("MyTask", sProcessTask, this, someParam);
}

void MyClass::ProcessTask(int param) 
{
  // do something on task
}

(Warning: Uncompiled and untested)