lib/ccan/typesafe_cb/test/compile_ok-typesafe_cb-vars.c

   1 #include <ccan/typesafe_cb/typesafe_cb.h>
   2 #include <stdlib.h>
   3
   4 /* const args in callbacks should be OK. */
   5
   6 static void _register_callback(void (*cb)(void *arg), void *arg)
   7 {
   8 }
   9
  10 #define register_callback(cb, arg)                              \
  11         _register_callback(typesafe_cb(void, void *, (cb), (arg)), (arg))
  12
  13 static void _register_callback_pre(void (*cb)(int x, void *arg), void *arg)
  14 {
  15 }
  16
  17 #define register_callback_pre(cb, arg)                                  \
  18         _register_callback_pre(typesafe_cb_preargs(void, void *, (cb), (arg), int), (arg))
  19
  20 static void _register_callback_post(void (*cb)(void *arg, int x), void *arg)
  21 {
  22 }
  23
  24 #define register_callback_post(cb, arg)                                 \
  25         _register_callback_post(typesafe_cb_postargs(void, void *, (cb), (arg), int), (arg))
  26
  27 struct undefined;
  28
  29 static void my_callback(struct undefined *undef)
  30 {
  31 }
  32
  33 static void my_callback_pre(int x, struct undefined *undef)
  34 {
  35 }
  36
  37 static void my_callback_post(struct undefined *undef, int x)
  38 {
  39 }
  40
  41 int main(int argc, char *argv[])
  42 {
  43         struct undefined *handle = NULL;
  44         void (*cb)(struct undefined *undef) = my_callback;
  45         void (*pre)(int x, struct undefined *undef) = my_callback_pre;
  46         void (*post)(struct undefined *undef, int x) = my_callback_post;
  47
  48         register_callback(cb, handle);
  49         register_callback_pre(pre, handle);
  50         register_callback_post(post, handle);
  51         return 0;
  52 }