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In the WinAPI, WndProc has lParam and wParam which are longs. This means you generally have to typecast them into the correct type.
I’ve read that message systems in OOP should not need to cast things and that this is a bad practice. Therefore, in a language like C++, how would a basic message system work, where each message has 2 parameters, or even object pointers, depending on the message, but doing so without typecasting?
Thanks
For the general case I doubt you can do without some typecasting.
However, in C++ level design the typecasting can be mostly be centralized.
Look up visitor pattern.
Cheers & hth.,