|  | 
 | #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 */ |