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Why is it that people always use use local objects of their main class in winmain and try to use all sorts of methods to get a pointer to the object ,like lets say in wndproc using Set/GetWindowLong.
Why dont they just use global objects simply? Whats the harm in using them?
Global variables can be altered by more any procedure in scope.......this can at times cause bugs that are hard to pin down....
On the plus side, global variables can be good for games and the like because the variable does not need to be passed when execution jumps from 1 procedure to the next......this can lead to quicker execution as the passed variable does not need to be pushed onto the stack and then popped back......But whether that optimisation is needed or is worthwhile depends on what you are doing....normally it isn’t so least privilege is a better option