C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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C2250
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     Compiler error C2250
 
     'identifier' : ambiguous inheritance of 'class::member'
 
     The derived class inherited more than one override of a virtual
     function of a virtual base.  These overrides are ambiguous in
     the derived class.
 
     The following is an example of this error:
 
          struct V { virtual void vf(); };
          struct A : virtual V { void vf(); };
          struct B : virtual V { void vf(); };
          struct D : A, B {};                   //error
                                    -♦-