--- /dev/null
+#include "typesafe_cb/typesafe_cb.h"
+#include <stdlib.h>
+
+static void _callback(void (*fn)(void *arg), void *arg)
+{
+ fn(arg);
+}
+
+#define callback(fn, arg) \
+ _callback(cast_if_type((fn), void (*)(typeof(arg)), void (*)(void *)), \
+ arg)
+
+static void my_callback(char *p)
+{
+}
+
+int main(int argc, char *argv[])
+{
+ callback(my_callback, "hello world");
+
+#ifdef FAIL
+ /* Must be a char * */
+ callback(my_callback, my_callback);
+#endif
+ return 0;
+}