Re: [boost] Novelty: automatically assigning unique integral type ids

From: Daryle Walker (darylew_at_[hidden])
Date: 2004-12-04 20:30:39

On 12/3/04 4:59 PM, "Jonathan Turkanis" <technews_at_[hidden]> wrote:

> Attached is some non-conforming code which automatically assigns a unique
> integer id to an arbitrary type. It's based on this post by Daniel Wallin:
> 
>   http://lists.boost.org/MailArchives/boost/msg69842.php
[TRUNCATE]

I take that computing these IDs at compile-time is a requirement?  Otherwise
you could use something like:

    reinterpret_cast<unsigned>(static_cast<void const *>(&typeid(T)));

This assumes that a void-pointer can fit within an unsigned.  If not, use
the appropriate type that corresponds to C-1999's "uintptr_t".  (Of course
it's possible that there's _no_ integral type big enough to fit a pointer.
In that case, my plan is screwed.)

-- 
Daryle Walker
Mac, Internet, and Video Game Junkie
darylew AT hotmail DOT com