Finalize a C++ class

// Prevent inheritance from a class

#define DECLARE_FINALIZE(C_)\
class C_;\
class Finalize_##C_{\
friend class C_;\
private:\
Finalize_##C_() {}\
}

#define FINALIZE(C_) virtual Finalize_##C_

// Test finalizing
DECLARE_FINALIZE(Base);
class Base: FINALIZE(Base) { // This finalizes 'Base'
};
class Derived : public Base{
};

Base b_;
Derived d_; // error: cannot access private constructor of 'Finalize_Base'