'class::symbol' : not all overloads are accessible
All overloaded functions derived from a base class must be accessible in the derived class.
For example, in the following code, the int version of overloaded function a is not accessible in the derived class B.
class A {
public:
double a(double);
private:
int a(int);
};
class B : public A {
using A::a; // error C2876
};