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From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2004-09-26 05:22:32

David Abrahams writes:
> 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.

Very-very recently.

> It seems to me that bool_ really ought to have
> whatever tags int_ has.


Aleksey Gurtovoy
MetaCommunications Engineering

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