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The Unified Event Model

In the past, there have been different ways to create and handle events. For example, callback functions are used pervasively within the WIN32 API. A lot of functions require a function pointer that is to be used as the callback function. However, this function has to be a static member function within your class, which means you don't have access to any of the data members of the current class instance. In other words, the this pointer within your static callback function is undefined. There have been a few workarounds for this, such as using global functions or variables, and sometimes, if you're lucky, the function that requires a callback function pointer might have another parameter to which you can assign the this ...