Answer Posted / vikas

Kamma's answer is right. Here is the explanation:

First a brush of some C++ concepts:

1. In virtual inheritance, the most derived class calls the
virtual base class' c'tor/d'tor.

2. The class declared as 'friend class' can access the
private member functions of a class.

In A a; A' compiler tries to call A::A(), since its declared
as public its called. Now A::A() requires to call its parent
class's c'tor which although private but is able to be
called[1 above].

In C c; C::C() calls B::B()[2 above].
C being a non friend class can't access B::B() which is private.

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http://www.cppquestions.com/viewtopic.php?f=33&t=25

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