best-practice on C header files with #ifndef #define #endif

Question

what is concerned best practice regarding the following \"pattern\"?

#ifndef BLAFOO_H
#define BLAFOO_H
/* ...
 * ...
 */
#endif /* BLAFOO_H */

Answer 1

I use an UUID that is my guarantee that #define not clashed with others. I've seen it somewhere and decided to use it as well.

My pattern is like this: ___H___,

eg. #define __TYPES_H_79057761_16D6_478A_BFBC_BBF17BD3E9B9__ for a file named types.h