Assignment operator not available in derived class

Question

The assignment operator in base class does not seem to be available in derived class. Given this code:

#include 

class A{
    int value;
pub         


        

Answer 1

The problem is that the compiler will add an implicit assignment operator for the B class, declared as

B& operator=(const B&);

This operator will hide the operator from A, so the compiler will not know about it.

The solution is to tell the compiler to also use the operator from A with the using keyword:

class B : public A
{
public:
    using A::operator=;
};