Refactoring with C++ 11

Question

Given the new toolset provided by c++ lots of programmers, aiming at code simplification, expressiveness, efficiency, skim through their old code and make tweaks (some point

Answer 1

Use of override keyword

Mark virtual functions in derived classes as override (if they indeed override of course). This can protect against introducing bugs in the future, e.g. by changing the signature of a virtual function in a base class and forgetting to change the signature in all derived classes accordingly.