You cannot override a class (static) constant

1_wrong.cpp

#include <iostream>

class Parent {
protected:
	static const int val = 1;
public:
	virtual int getval() {return val;}
};

class Child : public Parent {
private:
	static const int val = 2; // trying to override...
};

int main() {
	Child* instance = new Child();
	std::cout << instance->getval() << std::endl; // You'll see '1', expected '2'.
	delete instance;
}

2_right.cpp

#include <iostream>

class Parent {
protected:
	virtual const int val() {return 1;}
public:
	virtual int getval() {return val();}
};

class Child : public Parent {
private:
	const int val() {return 2;} // trying to override...
};

int main() {
	Child* instance = new Child();
	std::cout << instance->getval() << std::endl; // You'll see '2', as expected.
	delete instance;
}