tcon: add test case for const members.

[ccan] / ccan / tcon / tcon.h

diff --git a/ccan/tcon/tcon.h b/ccan/tcon/tcon.h
index 247a7331c8b98aa52c7da44750b6db0c02c6c872..e0f84b383976c4d106e6d9fe3ee9043c449d1ed8 100644 (file)
--- a/ccan/tcon/tcon.h
+++ b/ccan/tcon/tcon.h
@@ -321,6 +321,8 @@
  * tcon_container_of() evaluates to a pointer to the container
  * structure.  With sufficient compiler support, the pointer will be
  * correctly typed, and the type of @member_ptr will be verified.
+ * Note that const is discarded; a const @member_ptr still yields a
+ * non-const container (unless @canary is const).
  *
  * Returns NULL if @member_ptr is NULL.
  */