Edward Diener wrote:
David Abrahams wrote:
On Dec 14, 2009, at 8:40 PM, Edward Diener wrote:
Eric Niebler wrote:
Frédéric Bron wrote:
I would like to detect if the return type of a function is void or not within C++03 standard? <snip> I solved this problem once while writing a different trait and documented it here: http://www.boost.org/doc/libs/1_41_0/doc/html/proto/appendices.html#boost_pr...
It's extremely clever, as others have noted, but I am wondering if there is any website, or possibly newsgroup, devoted to advanced TMP techniques such as yours.
We had a short discussion of the limitations of that technique here: http://cpp-next.com/archive/2009/10/this-week-in-boost/comment-page-1/#comme...
I don't understand from your link what those limitations are, although it appears it revolves around the comma operator technique used by Eric Niebler in his example.
I think the point is that if the expression returns a type that has itself overloaded the comma operator, then that overload may get selected, trowing the whole thing off-track. (I'm sure someone will correct me if I've read it too quickly and missed the point.) Anyway, that's worth noting, but hardly seems likely to occur in practice. -- Eric Niebler BoostPro Computing http://www.boostpro.com