1#ifndef _ISO646_H
 2#define _ISO646_H
 3
 4#ifndef __cplusplus
 5
 6#define and    &&
 7#define and_eq &=
 8#define bitand &
 9#define bitor  |
10#define compl  ~
11#define not    !
12#define not_eq !=
13#define or     ||
14#define or_eq  |=
15#define xor    ^
16#define xor_eq ^=
17
18#endif
19
20#endif