Member functions can't be changed between virtual and nonvirtual without breaking callers (except for private functions under some conditions). If you think you might ever want to override a function, make it virtual (unless it's private, in which case you can safely change it to virtual later if it's not called from an inline). It is possible to add a second function that is virtual and have the original one call it, but that's less efficient (you always pay for two function calls).
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