summary_inheritance.h

// from https://www.programiz.com/cpp-programming/public-protected-private-inheritance

class base
{
public:
    int x;

protected:
    int y;

private:
    int z;
};

class publicDerived : public base
{
    // x is public
    // y is protected
    // z is not accessible from publicDerived
};

class protectedDerived : protected base
{
    // x is protected
    // y is protected
    // z is not accessible from protectedDerived
};

class privateDerived : private base
{
    // x is private
    // y is private
    // z is not accessible from privateDerived
};