FIX: /Og Causes vfptr Initialization Problems

MORE INFORMATION

   /* Compile Options: /Og
   // uncomment the following to illustrate the workaround which
   // disables global optimizations for the constructor
   //#define WORKAROUND

   class A
   {
   public:
   virtual void f() = 0;
   virtual void g();
   };

   void A::g()
   {
   }

   class B : public A
   {
   public:
   B();
   virtual void f();
   virtual void g();
   };

   void B::f()
   {
   }

   void B::g()
   {
   }

   #ifdef WORKAROUND
   #pragma optimize("g",off)
   #endif   // WORKAROUND

   B::B()
   {
   B* p = this;
   // If p->g() is changed to this->g(), or simply g(), the
   // correct member function (B::g) is called.
   p->g();  // Actually calls A::g()
   // if p->f() is changed to this->f(), or simply f(), the
   // correct member function (B::f) is called.
   p->f();  // Actually calls A::f(), which causes a runtime error
   }

   #ifdef WORKAROUND
   #pragma optimize("g",on)
   #endif   //WORKAROUND

   int main()
   {
   B b;
   return 0;
   }