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// Pls try the following program on virtual functions and try to do print on

//  most of the code in main().  Almost none of them works !

//

// The inheritance structure is:

//

// V : VA VB

// A : (V)

// B : A

// D : AD (V)

// C : (V)

// E : B (V) D C

//

class VA

{

public:

    int va;

};

class VB

{

public:

    int vb;

    int fvb();

    virtual int vvb();

};

class V : public VA, public VB

{

public:

    int f();

    virtual int vv();

    int w;

};

class A : virtual public V

{

public:

    virtual int f();

private:

    int a;

};

class B : public A

{

public:

    int f();

private:

    int b;

};

class C : public virtual V

{

public:

    int c;

};

class AD

{

public:

    virtual int vg() = 0;

};

class D : public AD, virtual public V

{

public:

    static void s();

    virtual int vg();

    virtual int vd();

    int fd();

    int d;

};

class E : public B, virtual public V, public D, public C

{

public:

    int f();

    int vg();

    int vv();

    int e;

};

D   dd;

D*  ppd = ⅆ

AD* pAd = ⅆ

A   a;

B   b;

C   c;

D   d;

E   e;

V   v;

VB  vb;

A*      pAa     =       &a;

A*      pAe     =       &e;

B*      pBe     =       &e;

D*      pDd     =       &d;

D*      pDe     =       &e;

V*      pVa     =       &a;

V*      pVv     =       &v;

V*      pVe     =       &e;

V*     pVd      =       &d;

AD*     pADe    =       &e;

E*      pEe     =       &e;

VB*     pVB     =       &vb;

void init()

{

        a.vb = 1;

        b.vb = 2;

        c.vb = 3;

        d.vb = 4;

        e.vb = 5;

        v.vb = 6;

        vb.vb = 7;

        d.d     = 1;

        e.d     =  2;

}

extern "C" int printf(const char *, ...);

int all_count = 0;

int failed_count = 0;

#define TEST(EXPR, EXPECTED) \

   ret = EXPR; \

   if (ret != EXPECTED) {\

      printf("Failed %s is %d, should be %d!\n", #EXPR, ret, EXPECTED); \

      failed_count++; } \

   all_count++;

int ret;

void test_calls()

{

        TEST(pAe->f(), 20);

        TEST(pAa->f(), 1);

        TEST(pDe->vg(), 202);

        TEST(pADe->vg(), 202);

        TEST(pDd->vg(), 101);

        TEST(pEe->vvb(), 411);

        TEST(pVB->vvb(), 407);

        TEST(pBe->vvb(), 411);

        TEST(pDe->vvb(), 411);

        TEST(pEe->vd(), 282);

        TEST(pEe->fvb(), 311);

        TEST(pEe->D::vg(), 102);

        printf("Did %d tests, of which %d failed.\n", all_count, failed_count);

}

#ifdef usestubs

extern "C" {

  void set_debug_traps();

  void breakpoint();

};

#endif

int main()

{

#ifdef usestubs

   set_debug_traps();

   breakpoint();

#endif

    init();

    e.w = 7;

    e.vb = 11;

    test_calls();

    return 0;

}

int A::f() {return 1;}

int B::f() {return 2;}

void D::s() {}

int E::f() {return 20;}

int D::vg() {return 100+d;}

int E::vg() {return 200+d;}

int V::f() {return 600+w;}

int V::vv() {return 400+w;}

int E::vv() {return 450+w;}

int D::fd() {return 250+d;}

int D::vd() {return 280+d;}

int VB::fvb() {return 300+vb;}

int VB::vvb() {return 400+vb;}