Home | History | Annotate | Download | only in bitfield 
      1 typedef unsigned int uint32_t;
      2 
      3 enum MaskingOperator
      4 {
      5 	eMaskingOperatorDefault = 0,
      6 	eMaskingOperatorAnd = 1,
      7 	eMaskingOperatorOr = 2,
      8 	eMaskingOperatorXor = 3,
      9 	eMaskingOperatorNand = 4,
     10 	eMaskingOperatorNor = 5
     11 };
     12 
     13 class MaskedData
     14 {
     15 private:
     16 	uint32_t value;
     17 	uint32_t mask;
     18 	MaskingOperator oper;
     19 public:
     20 	MaskedData( uint32_t V = 0,
     21 				uint32_t M = 0,
     22 				MaskingOperator P = eMaskingOperatorDefault) :
     23 		value(V),
     24 		mask(M),
     25 		oper(P)
     26 	{
     27 	}
     28 
     29 	uint32_t apply()
     30 	{
     31 		switch(oper)
     32 		{
     33 			case eMaskingOperatorAnd:
     34 				return value & mask;
     35 			case eMaskingOperatorOr:
     36 				return value | mask;
     37 			case eMaskingOperatorXor:
     38 				return value ^ mask;
     39 			case eMaskingOperatorNand:
     40 				return ~(value & mask);
     41 			case eMaskingOperatorNor:
     42 				return ~(value | mask);
     43 			case eMaskingOperatorDefault: // fall through
     44 			default:
     45 				return value;
     46 		}
     47 	}
     48 
     49 	void setValue(uint32_t V)
     50 	{
     51 		value = V;
     52 	}
     53 
     54 	void setMask (uint32_t M)
     55 	{
     56 		mask = M;
     57 	}
     58 
     59 	void setOperator(MaskingOperator P)
     60 	{
     61 		oper = P;
     62 	}
     63 };
     64 
     65 int main()
     66 {
     67 	MaskedData data_1(0xFF0F,0xA01F,eMaskingOperatorAnd);
     68 	MaskedData data_2(data_1.apply(),0x1AFC,eMaskingOperatorXor);
     69 	MaskedData data_3(data_2.apply(),0xFFCF,eMaskingOperatorOr);
     70 	MaskedData data_4(data_3.apply(),0xAABC,eMaskingOperatorAnd);
     71 	MaskedData data_5(data_4.apply(),0xFFAC,eMaskingOperatorNor);
     72 	MaskedData data_6(data_5.apply(),0x0000BEEF,eMaskingOperatorAnd);
     73 	return data_6.apply(); // <-- what comes out of here?
     74 }