Runtime Error R6025 - pure virtual function call

https://support.microsoft.com/ko-kr/kb/125749/ko

샘플 코드

   /* Compile options needed: none
   */ 
   class A;
   void fcn( A* );
   class A
   {
   public:
       virtual void f() = 0;
       A() { fcn( this ); }
   };
   class B : A
   {
       void f() { }
   };
   void fcn( A* p )
   {
       p->f();
   }
   // The declaration below invokes class B's constructor, which
   // first calls class A's constructor, which calls fcn. Then
   // fcn calls A::f, which is a pure virtual function, and
   // this causes the run-time error. B has not been constructed
   // at this point, so the B::f cannot be called. You would not
   // want it to be called because it could depend on something
   // in B that has not been initialized yet.
   B b;
   void main()
   {
   }