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Question #133 Difficulty:
According to the C++17 standard, what is the output of this program?
#include <iostream>
using namespace std;
class A
{
public:
A() { cout << "A"; }
A(const A &) { cout << "a"; }
};
class B: public virtual A
{
public:
B() { cout << "B"; }
B(const B &) { cout<< "b"; }
};
class C: public virtual A
{
public:
C() { cout<< "C"; }
C(const C &) { cout << "c"; }
};
class D:B,C
{
public:
D() { cout<< "D"; }
D(const D &) { cout << "d"; }
};
int main()
{
D d1;
D d2(d1);
}
Hint:
Virtual inheritance is a technique used to avoid multiple copies of the same indirect base class in an object.
The call order of base constructors is well defined.
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