http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60201
--- Comment #5 from Andrew Stern <andrew.stern at itg dot com> --- It seems that if I change my code From: Baseclass<Subclass<ParamOne, ParamTwo>, ParamOne, ParamTwo> test; To: Subclass<ParamOne, ParamTwo> test; Then it seems to work. This produces the following output: The this pointer is 7fffddafc360 with a size of 8 and values of 304 and 472