C / C++ / MFC

int someNumber = 5;

int& get()
{
  return someNumber;
}

void main()
{
  int a = get(); //a = 5
  get() = 52; //someNumber = 52
  int b = get(); //b = 52, obviously
}

class bclass
{
public:
	bclass(){}
	virtual void cheese()=0;
	bclass(const bclass& other){ _asm{int 3} }
};

class dclass : public bclass
{
public:
	dclass(){val=5;}
	void cheese() { _asm{int 3} }
	dclass(const dclass& other){ _asm{int 3} }

	int val;
};

dclass base;

bclass& get()
{
	return base;
}

void main()
{
	dclass argh;
	argh.val = 2;
	get() = argh; //copy constructors not called, no error messages, base.val = 5
	get().cheese();
}

bclass& argh = d2();
bclass& hmm = dclass();
hmm = argh;
hmm.cheese();