git.ozlabs.org Git - ccan/blob - ccan/typesafe_cb/test/compile_fail-typesafe_cb.c

   1 #include <ccan/typesafe_cb/typesafe_cb.h>
   2 #include <stdlib.h>
   3
   4 static void _register_callback(void (*cb)(void *arg), void *arg)
   5 {
   6 }
   7
   8 #define register_callback(cb, arg)                              \
   9         _register_callback(typesafe_cb(void, void *, (cb), (arg)), (arg))
  10
  11 static void my_callback(char *p)
  12 {
  13 }
  14
  15 int main(int argc, char *argv[])
  16 {
  17         char str[] = "hello world";
  18 #ifdef FAIL
  19         int *p;
  20 #if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P
  21 #error "Unfortunately we don't fail if typesafe_cb_cast is a noop."
  22 #endif
  23 #else
  24         char *p;
  25 #endif
  26         p = NULL;
  27
  28         /* This should work always. */
  29         register_callback(my_callback, str);
  30
  31         /* This will fail with FAIL defined */
  32         register_callback(my_callback, p);
  33         return 0;
  34 }