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Guido van Rossum 1990-10-14 12:07:46 +00:00
parent c636014c43
commit 85a5fbbdfe
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Include/bitset.h Normal file
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/* Bitset interface */
#define BYTE char
typedef BYTE *bitset;
bitset newbitset PROTO((int nbits));
void delbitset PROTO((bitset bs));
/* int testbit PROTO((bitset bs, int ibit)); /* Now a macro, see below */
int addbit PROTO((bitset bs, int ibit)); /* Returns 0 if already set */
int samebitset PROTO((bitset bs1, bitset bs2, int nbits));
void mergebitset PROTO((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)
#define testbit(ss, ibit) (((ss)[BIT2BYTE(ibit)] & BIT2MASK(ibit)) != 0)