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#include <iostream>
 
class B
{
protected:
    int x;
 
protected:
 
    B(int x) : x{x}{std::cout << x << std::endl;}
};
 
class B1 : virtual public B
{
protected:
 
    B1() : B(0){}
};
 
class B2 : virtual public B
{
protected:
 
    B2() : B(10){}
};
 
class D : public B1, public B2
{
public:
 
    D() : B{99}, B1{}, B2{} {}
    void print() {std::cout << "Final: " << x << std::endl;}
};
 
int main() {
	D d;
	d.print();
	return 0;
}

prog.cpp: In constructor ‘D::D()’:
prog.cpp:17:5: error: ‘B1::B1()’ is protected
     B1() : B(0){}
     ^
prog.cpp:31:27: error: within this context
     D() : B{99}, B1{}, B2{} {}
                           ^
prog.cpp:24:5: error: ‘B2::B2()’ is protected
     B2() : B(10){}
     ^
prog.cpp:31:27: error: within this context
     D() : B{99}, B1{}, B2{} {}
                           ^

Standard output is empty