Re: [Boost-users] [enable_if] using enable_if to extend std::numeric_limits?

From: me22 (me22.ca_at_[hidden])
Date: 2007-03-07 12:22:08

On 3/7/07, james.jones_at_[hidden]
<james.jones_at_[hidden]> wrote:
> Suppose I have a set of templates that have a common interface (each is a model of the same concept, to use that lingo). I'd like to extend std::numeric_limits to support this concept. I'm trying to find a way to use enable_if to do this, but I don't see how. Is this possible? Is there some other trick to doing this?
>
I don't think you can "extend" classes that already exist.  Note, for
example, that boost has integer_traits, and doesn't try to modify
numeric_limits.

Why do you want the concept to be in numeric_limits?  Can you not
simply use is_decimal_type?