diamond inheritance in c++...

a.cc

#include <iostream>

using namespace std;

class A
{
public:
    virtual void Hello() {  cout << "Hello from A" << endl; }
    virtual ~A() {}
};

class B : public A
{
public:
    virtual void Eh() { cout << "Eh from B" << endl; }
    virtual void Hello() {  cout << "Hello from B" << endl; }
    virtual ~B() {}
};

class C : public A
{
public:
    virtual void Boo() { cout << "Boo! from C" << endl; }
    virtual void Hello() {  cout << "Hello from C" << endl; }
    virtual ~C() {}
};

class D : public B, public C
{
public:
    virtual B* get() { return static_cast<B*>(this); }
    virtual ~D() {}
};

int main()
{
    auto x = new D();
    x->get()->Hello();
}

CPPFLAGS=--std=c++11 make a