Bit 연산 매크로

#ifndef __S_BIT_H__
#define __S_BIT_H__
 
typedef long long s_bit_t;
 
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
 
#define S_BIT_SET(NR, BITS)     (NR |= (1LL << BITS));
 
#define S_BIT_SET_ALL(NR)       (NR = -1LL);
 
#define S_BIT_CLR(NR, BITS)     (NR &= ~(1LL << BITS));
 
#define S_BIT_CLR_ALL(NR)       (NR = ~(-1LL));
 
#define S_BIT_IS_SET(NR, BITS)  ((NR & (1LL << BITS)) ? TRUE : FALSE)
 
#define S_BIT_IS_CLR(NR, BITS)  ((!(NR & (1LL << BITS))) ? TRUE : FALSE)
 
#endif /* __S_BIT_H__*/

사용 예시

#include <stdio.h>
#include "s_bit.h"
int main()
{
    s_bit_t bits = 0;
    S_BIT_SET_ALL(bits);
    S_BIT_CLR_ALL(bits);
    S_BIT_SET(bits, 4);
    S_BIT_SET(bits, 8);
    printf("%d\n", S_BIT_IS_SET(bits, 7));
    printf("%d\n", S_BIT_IS_SET(bits, 4));
    printf("%d\n", S_BIT_IS_CLR(bits, 4));
    printf("%d\n", S_BIT_IS_CLR(bits, 7));
    return 0;
}
 
 
$./test
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