typesafe_cb: expose _exact and _def variants.

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

diff --git a/ccan/typesafe_cb/test/compile_fail-typesafe_cb_exact.c b/ccan/typesafe_cb/test/compile_fail-typesafe_cb_exact.c
new file mode 100644 (file)
index 0000000..0f61d5d
--- /dev/null
+++ b/ccan/typesafe_cb/test/compile_fail-typesafe_cb_exact.c
@@ -0,0 +1,33 @@
+#include <ccan/typesafe_cb/typesafe_cb.h>
+#include <stdlib.h>
+
+static void _register_callback(void (*cb)(void *arg), const void *arg)
+{
+}
+
+#define register_callback(cb, arg)                             \
+       _register_callback(typesafe_cb_exact(void, (cb), (arg)), (arg))
+
+static void my_callback(const char *p)
+{
+}
+
+int main(int argc, char *argv[])
+{
+#ifdef FAIL
+       char *p;
+#if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P
+#error "Unfortunately we don't fail if cast_if_type is a noop."
+#endif
+#else
+       const char *p;
+#endif
+       p = NULL;
+
+       /* This should work always. */
+       register_callback(my_callback, (const char *)"hello world");
+
+       /* This will fail with FAIL defined */
+       register_callback(my_callback, p);
+       return 0;
+}