Why is this C++ code incorrect?

["Jiutao Nie" <njt at mprc dot pku dot edu dot cn>]

Hi,

  Compiling the following code with g++ will report error:`static void
A::operator delete(void*)' is protected.  It's correct If B is derived from
A without "virtual".  Why does the "new B" expression need to check the
delete operator's accessibility when B is virutally derived from A?

class A
{
protected:
  static void operator delete( void * ) {}
};

class B : public virtual A {};

void f()
{
  new B;
}