llvm-project/lldb/examples/synthetic/bitfield/program.cpp

typedef unsigned int uint32_t;

enum MaskingOperator
{
	eMaskingOperatorDefault = 0,
	eMaskingOperatorAnd = 1,
	eMaskingOperatorOr = 2,
	eMaskingOperatorXor = 3,
	eMaskingOperatorNand = 4,
	eMaskingOperatorNor = 5
};

class MaskedData
{
private:
	uint32_t value;
	uint32_t mask;
	MaskingOperator oper;
public:
	MaskedData( uint32_t V = 0,
				uint32_t M = 0,
				MaskingOperator P = eMaskingOperatorDefault) :
		value(V),
		mask(M),
		oper(P)
	{
	}
		
	uint32_t apply()
	{
		switch(oper)
		{
			case eMaskingOperatorAnd:
				return value & mask;
			case eMaskingOperatorOr:
				return value | mask;
			case eMaskingOperatorXor:
				return value ^ mask;
			case eMaskingOperatorNand:
				return ~(value & mask);
			case eMaskingOperatorNor:
				return ~(value | mask);
			case eMaskingOperatorDefault: // fall through
			default:
				return value;
		}
	}
	
	void setValue(uint32_t V)
	{
		value = V;
	}
	
	void setMask (uint32_t M)
	{
		mask = M;
	}
	
	void setOperator(MaskingOperator P)
	{
		oper = P;
	}	
};

int main()
{
	MaskedData data_1(0xFF0F,0xA01F,eMaskingOperatorAnd);
	MaskedData data_2(data_1.apply(),0x1AFC,eMaskingOperatorXor);
	MaskedData data_3(data_2.apply(),0xFFCF,eMaskingOperatorOr);
	MaskedData data_4(data_3.apply(),0xAABC,eMaskingOperatorAnd);
	MaskedData data_5(data_4.apply(),0xFFAC,eMaskingOperatorNor);
	MaskedData data_6(data_5.apply(),0x0000BEEF,eMaskingOperatorAnd);
	return data_6.apply(); // <-- what comes out of here?
}