Question

My actual problem is a little more complicated and requires using template classes.
This is a simpler version of that.

I have two classes:

class A
{
public:
   float a() { return _value; }
private:
   float _value;
};

class B
{
public:
   float b() { return _value; }
private:
   float _value;
};

class AB : public A, public B
{
public:
   // a() should return A::_value ?
   // b() should return B::_value ?
}

Will there be any conflicts between the members _value from A and B if that member is private? It makes sense that there would not be such a conflict since AB has no knowledge of that member.

Answer 1

Even if the members were public, there would be no conflict. There would, however, be an ambiguity if you tried to access _value from AB‘s scope (assuming AB inherits from A and B) without qualifying it somehow:

class A { public: float _value; };
class B { public: float _value; };
class AB : public A, public B {
public:
  void f() {
    std::cout << _value;    // Error: ambiguous reference
    std::cout << A::_value; // OK
  }
};
class AB2 : public A, public B {
public:
  using B::_value;
  void f() {
    std::cout << _value; // OK; resolves to B's version.
  }
};