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From: usenet only_tech_talk on 23 Mar 2010 03:23
The best I've been able to come up with is to bypass the intermediary
class B<> and do the required modification to bar() in the derived
class C:

class C : A< C >{
typedef A< C > impl_;
public:
void bar(){
impl_::bar();
// do something else.
}

private:
friend class A<C>;
void foo()const{}

};

But this set up has to be repeated in all classes, D, E etc. that
require a modified bar() i.e. genericity is lost. I suppose that's as
good as it gets.

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