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From: David Abrahams (dave_at_[hidden])
Date: 2004-09-24 14:37:49

Cromwell Enage <sponage_at_[hidden]> writes:

> --- Ian McCulloch <ianmcc_at_[hidden]>
> 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

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