Cromwell Enage <sponage@yahoo.com> writes:
--- Ian McCulloch <ianmcc@physik.rwth-aachen.de> wrote:
Hi,
Hello.
Is the following program supposed to compile with the new MPL?
Probably not.
But, maybe I was mis-using equal_to ?
equal_to<...> no longer accepts bool_<...> or any expressions resulting in bool_<...> as a template argument, since bool_<...> does not contain a typedef named tag (for numeric_cast<...>). I don't have the MPL book, so I don't know the rationale behind it
Unfortunately, that bit isn't covered in the book. I think Aleksey added the tag stuff very recently as a way of handling non-integral numeric types. It seems to me that bool_ really ought to have whatever tags int_ has. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com