Typesafe callback infrastructure.

[ccan] / typesafe_cb / test / compile_fail-cast_if_type-callback-int.c

diff --git a/typesafe_cb/test/compile_fail-cast_if_type-callback-int.c b/typesafe_cb/test/compile_fail-cast_if_type-callback-int.c
new file mode 100644 (file)
index 0000000..85006c9
--- /dev/null
+++ b/typesafe_cb/test/compile_fail-cast_if_type-callback-int.c
@@ -0,0 +1,27 @@
+#include "typesafe_cb/typesafe_cb.h"
+#include <stdlib.h>
+
+void _callback(void (*fn)(void *arg), void *arg);
+void _callback(void (*fn)(void *arg), void *arg)
+{
+       fn(arg);
+}
+
+/* Callback is set up to warn if arg isn't a pointer (since it won't
+ * pass cleanly to _callback's second arg. */
+#define callback(fn, arg)                                              \
+       _callback(cast_if_type((fn), void (*)(typeof(arg)), void (*)(void *)), \
+                 arg)
+
+void my_callback(int something);
+void my_callback(int something)
+{
+}
+
+int main(int argc, char *argv[])
+{
+#ifdef FAIL
+       callback(my_callback, 100);
+#endif
+       return 0;
+}