[c++] What is the purpose of the "final" keyword in C++11 for functions?

"final" also allows a compiler optimization to bypass the indirect call:

class IAbstract
{
public:
  virtual void DoSomething() = 0;
};

class CDerived : public IAbstract
{
  void DoSomething() final { m_x = 1 ; }

  void Blah( void ) { DoSomething(); }

};

with "final", the compiler can call CDerived::DoSomething() directly from within Blah(), or even inline. Without it, it has to generate an indirect call inside of Blah() because Blah() could be called inside a derived class which has overridden DoSomething().

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