Re: [boost] [mpl] Integral Constant is over specified

From: Andy Little (andy_at_[hidden])
Date: 2006-07-28 11:53:43

"David Abrahams" <dave_at_[hidden]> wrote
> "Andy Little" <andy_at_[hidden]> writes:
>> Also I suspect that the change from boost::is_same to std::is_same is going
>> to
>> break a lot of code, unless the mpl tag requiremnet is lifted ;-)

> Ditto.

The boost type_traits integral constant is derived from mpl::integral_c which
has a tag type member, without which boost:::integral_constant wouldnt work with
mpl types such as equal_to. The std version doesnt specify the tag, nor does the
boost type_traits version in its documentation. Without the tag,
boost::integral_constant would not work with mpl types such as equal_to as
demonstrated in another mail in this thread. Therefore changing from
boost::integral_constant to std::integral_constant will break code that uses
mpl. Maybe its not important, but  the innocent std:: integral_constant will 
appear to be bug ridden.

regards
Andy Little