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#include <iostream>
using namespace std;
 
class Base
{
protected:
    int x{ 0 };
};
 
class DerivedClass1 : public Base
{
	void test() {
		std::cout<<x<<std::endl; 
	}
private:
	using Base::x; 
 
};
 
class DerivedClass2 : public DerivedClass1
{
public:
    int getX() const
    {
        return x;
    }
};
 
int main()
{
    DerivedClass2 d2{};
    int x{ d2.getX() };
    return 0;
}
 
 

prog.cpp: In member function ‘int DerivedClass2::getX() const’:
prog.cpp:25:16: error: ‘int Base::x’ is protected within this context
         return x;
                ^
prog.cpp:7:14: note: declared protected here
     int x{ 0 };
              ^

Standard output is empty