... the results are undefined, and we all know what 'undefined' means: it means it works during development, it works during testing, and it blows up in your most important customers' faces.
Scott MeyersA non-virtual function says, you have to do this and you must do it this way. A virtual function says you have to do this, but you don't have to do it this way. That's their fundamental difference.
Scott Meyers