File: main.cpp

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#include <cassert>
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);
}