File: main.cpp

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struct B
{
  int j;
  B(int j):j(j){}
};

struct A
{
  int i;
  A(int i): i(i) {}
  A(const B& b):i(b.j){}
};

struct C: public A
{
  C(int i): A(i){}
};


int func1(const A& a)
{
  return a.i;
}

int func2(A& a)
{
  return a.i;
}

int func3(A a)
{
  return a.i;
}

int main()
{
  A a1(10);
  assert(func1(a1)==10);
  assert(func2(a1)==10);
  assert(func3(a1)==10);

  const A a2(20);
  assert(func1(a2)==20);
  assert(func3(a2)==20);

  A& r1 = a1;
  assert(func1(r1)==10);
  assert(func2(r1)==10);
  assert(func3(r1)==10);

  const A& r2 = a1;
  assert(func1(r2)==10);
  assert(func3(r2)==10);

  B b1(30);
  assert(func3(b1)==30);

  B& r3 = b1;
  assert(func3(r3)==30);

  const B& r4 = b1;
  assert(func3(r4)==30);

  C c1(40);
  assert(func1(c1)==40);
  assert(func2(c1)==40);
  assert(func3(c1)==40);

  const C c2(50);
  assert(func1(c2)==50);
  assert(func3(c2)==50);

  C& r5 = c1;
  assert(func1(r5)==40);
  assert(func2(r5)==40);
  assert(func3(r5)==40);

  const C&  r6 = c2;
  assert(func1(r6)==50);
  assert(func3(r6)==50);

}