CPP11 — Do POA servant classes need to use virtual inheritance?

Summary: 2. The spec is silent on whether POA servant classes need to use
virtual inheritence when an IDL class inherits from the same base
interface more than once:

// IDL
interface A

;
interface B : A { };
interface C : A { };
value D : supports B, C { };

Must POA_B & POA_C inherit virtually from POA_A or can defined
independently with all of interface A"s operations? This makes a big
difference for values that support interfaces, since, for example, value
D is defined by the C++ language mapping to inherit from both POA_B and
POA_C. So, does value D inherit one or two versions of A::op()?

resolved