|  |  | 
|  | #ifndef Py_BITSET_H | 
|  | #define Py_BITSET_H | 
|  | #ifdef __cplusplus | 
|  | extern "C" { | 
|  | #endif | 
|  |  | 
|  | /* Bitset interface */ | 
|  |  | 
|  | #define BYTE		char | 
|  |  | 
|  | typedef BYTE *bitset; | 
|  |  | 
|  | bitset newbitset(int nbits); | 
|  | void delbitset(bitset bs); | 
|  | #define testbit(ss, ibit) (((ss)[BIT2BYTE(ibit)] & BIT2MASK(ibit)) != 0) | 
|  | int addbit(bitset bs, int ibit); /* Returns 0 if already set */ | 
|  | int samebitset(bitset bs1, bitset bs2, int nbits); | 
|  | void mergebitset(bitset bs1, bitset bs2, int nbits); | 
|  |  | 
|  | #define BITSPERBYTE	(8*sizeof(BYTE)) | 
|  | #define NBYTES(nbits)	(((nbits) + BITSPERBYTE - 1) / BITSPERBYTE) | 
|  |  | 
|  | #define BIT2BYTE(ibit)	((ibit) / BITSPERBYTE) | 
|  | #define BIT2SHIFT(ibit)	((ibit) % BITSPERBYTE) | 
|  | #define BIT2MASK(ibit)	(1 << BIT2SHIFT(ibit)) | 
|  | #define BYTE2BIT(ibyte)	((ibyte) * BITSPERBYTE) | 
|  |  | 
|  | #ifdef __cplusplus | 
|  | } | 
|  | #endif | 
|  | #endif /* !Py_BITSET_H */ |