I have been attempting to make a game engine in C++ and have come across the dilemma of game state management. I have done a lot of research and found numerous ways of accomplishing from game engine with derived classes to using enums and I would like to know the most effective/efficient way of managing game states.
I would like to know how other people implement their game state management, i.e. what you like the most and why you like it. Also, any tutorials/code examples that are generally about game state would also be much appreciated.