include/linux/pickop.h

   1 #ifndef _LINUX_PICKOP_H
   2 #define _LINUX_PICKOP_H
   3
   4 #undef PICK_TYPE_EQUAL
   5 #define PICK_TYPE_EQUAL(var, type) \
   6                 __builtin_types_compatible_p(typeof(var), type)
   7
   8 extern int __bad_func_type(void);
   9
  10 #define PICK_FUNCTION(type1, type2, func1, func2, arg0, ...)            \
  11 do {                                                                    \
  12         if (PICK_TYPE_EQUAL((arg0), type1))                             \
  13                 func1((type1)(arg0), ##__VA_ARGS__);                    \
  14         else if (PICK_TYPE_EQUAL((arg0), type2))                        \
  15                 func2((type2)(arg0), ##__VA_ARGS__);                    \
  16         else __bad_func_type();                                         \
  17 } while (0)
  18
  19 #define PICK_FUNCTION_RET(type1, type2, func1, func2, arg0, ...)        \
  20 ({                                                                      \
  21         unsigned long __ret;                                            \
  22                                                                         \
  23         if (PICK_TYPE_EQUAL((arg0), type1))                             \
  24                 __ret = func1((type1)(arg0), ##__VA_ARGS__);            \
  25         else if (PICK_TYPE_EQUAL((arg0), type2))                        \
  26                 __ret = func2((type2)(arg0), ##__VA_ARGS__);            \
  27         else __ret = __bad_func_type();                                 \
  28                                                                         \
  29         __ret;                                                          \
  30 })
  31
  32 #endif /* _LINUX_PICKOP_H */