typesafe_cb: simplify, preserve namespace.

[ccan] / ccan / typesafe_cb / test / compile_fail-typesafe_cb_cast.c

diff --git a/ccan/typesafe_cb/test/compile_fail-typesafe_cb_cast.c b/ccan/typesafe_cb/test/compile_fail-typesafe_cb_cast.c
new file mode 100644 (file)
index 0000000..07a204f
--- /dev/null
+++ b/ccan/typesafe_cb/test/compile_fail-typesafe_cb_cast.c
@@ -0,0 +1,25 @@
+#include <ccan/typesafe_cb/typesafe_cb.h>
+
+void _set_some_value(void *val);
+
+void _set_some_value(void *val)
+{
+}
+
+#define set_some_value(expr)                                           \
+       _set_some_value(typesafe_cb_cast(void *, unsigned long, (expr)))
+
+int main(int argc, char *argv[])
+{
+#ifdef FAIL
+       int x = 0;
+       set_some_value(x);
+#if !HAVE_TYPEOF||!HAVE_CAST_TO_UNION
+#error "Unfortunately we don't fail if typesafe_cb_cast is a noop."
+#endif
+#else
+       void *p = 0;
+       set_some_value(p);
+#endif
+       return 0;
+}