Question

What needs to be changed for this code to compile?

class A{};
class B: A{};

void foo(A&a) {}

int main(int argc, char* argv[])
{
  B b;
  foo(b);
  return 0;
}

Cosmo · Accepted Answer

Change inheritance type of class B to public

Cosmo · Answer

Change inheritance type of class B to protected

Cosmo · Answer

Declare inheritance B from A as virtual

Cosmo · Answer

Nothing, code will compile