Subclassing in C++: overriden fields are not removed, the syntax for accessing them is just unusual. This is not a surprise, since subclassing strictly extends objects.

subclass.cpp

#include <cstdio>

using namespace std;

class A {
public:
    int fa;
};

class B : public A {
public:
    int fa;
    int fb;
};

int main(int argc, char *argv[]) {
    B b;

    b.A::fa = 2;
    b.fa = 3;
    b.fb = 5;

    printf("b.A::fa = %d; b.fa = %d; b.fb = %d\n", b.A::fa, b.fa, b.fb);

    return 0;
}

Build and run with:

% g++ -Wall -o subclass subclass.cpp && ./subclass
b.A::fa = 2; b.fa = 3; b.fb = 5