www.pudn.com > bp_cpp.zip > bit.h

#ifndef _PUBLIC_BIT_H 
#define _PUBLIC_BIT_H 
/* 
 * public/bit.h 
 * 2004-05-10 by ShanLanshan 
 */ 
 
#define bit_place(n, i) do {n |= (1 << i);} while(0) 
 
#define bit_clear(n, i) do {n &= ~(1 << i);} while(0) 
 
#define bit_set(n, i, v) do {	\ 
	n = v ? 				\ 
		n | (1 << i) 		\ 
		:					\ 
		n & ~(1 << i);		\ 
} while(0) 
 
#define bit_get(n, i) (1&&(n & (1 << i))) 
 
#define bit_placed(n, i) (1&&(n & (1 << i))) 
 
#define bit_cleared(n, i) (!(n & (1 << i))) 
 
#endif /* !_PUBLIC_BIT_H */