include/linux/typecheck.h

   1 #ifndef TYPECHECK_H_INCLUDED
   2 #define TYPECHECK_H_INCLUDED
   3
   4 /*
   5  * Check at compile time that something is of a particular type.
   6  * Always evaluates to 1 so you may use it easily in comparisons.
   7  */
   8 #define typecheck(type,x) \
   9 ({      type __dummy; \
  10         typeof(x) __dummy2; \
  11         (void)(&__dummy == &__dummy2); \
  12         1; \
  13 })
  14
  15 /*
  16  * Check at compile time that 'function' is a certain type, or is a pointer
  17  * to that type (needs to use typedef for the function type.)
  18  */
  19 #define typecheck_fn(type,function) \
  20 ({      typeof(type) __tmp = function; \
  21         (void)__tmp; \
  22 })
  23
  24 #endif          /* TYPECHECK_H_INCLUDED */