Question

If I have the given below classes:

class TestA
{
    public:
        const TestA &operator=(const int A){return *this;}
};

class TestB : public TestA
{
    public:
        //Inheritance?
};

The question presumes both class TestA and class TestB have exactly the same contents in terms of variables: Is the assignment operator (or any other operator) inherited?

Is the following valid?

class TestB : public TestA
{
    public:
        using TestA::operator=;
        //Inheritance?
};

If it is valid, would it make a difference?

Answer 1

Assignment operators are hidden by derived class by default (as compiler always generates a T& operator = () for any class T, if not specified). Which makes the inherited operator = not usable.

Yes when you specify them with using keyword; they become usable. Demo. So your code snippet does make sense.

public: using TestA::operator=;