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

   1 #include <ccan/typesafe_cb/typesafe_cb.h>
   2
   3 void _set_some_value(void *val);
   4
   5 void _set_some_value(void *val)
   6 {
   7         (void)val;
   8 }
   9
  10 #define set_some_value(expr)                                            \
  11         _set_some_value(typesafe_cb_cast(void *, unsigned long, (expr)))
  12
  13 int main(void)
  14 {
  15 #ifdef FAIL
  16         int x = 0;
  17         set_some_value(x);
  18 #if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P
  19 #error "Unfortunately we don't fail if typesafe_cb_cast is a noop."
  20 #endif
  21 #else
  22         void *p = 0;
  23         set_some_value(p);
  24 #endif
  25         return 0;
  26 }