> My gripe with _BitInt is that it is made for an abstract machine that has
no real world analogous.

Doesn’t this logic also apply to bool?

Cheers,
Jeremy

On Mon, Sep 1, 2025 at 13:47 Tiago Freire via Std-Proposals <
std-proposals_at_[hidden]> wrote:

> My gripe with _BitInt is that it is made for an abstract machine that has
> no real world analogous.
>
> ints don't have just size but also alignment properties.
> what should the alignment of _BitInt(512) should be?
> Should it align to the cache line? or should it align with the
> requirements for the largest implementable operand to save on space?
>
>
> ------------------------------
> *From:* Std-Proposals <std-proposals-bounces_at_[hidden]> on behalf
> of Jan Schultke via Std-Proposals <std-proposals_at_[hidden]>
> *Sent:* Monday, September 1, 2025 8:03:08 PM
> *To:* C++ Proposals <std-proposals_at_[hidden]>
> *Cc:* Jan Schultke <janschultke_at_[hidden]>
> *Subject:* [std-proposals] D3666R0 Bit-precise integers
>
> Hey,
>
> As some of you may already know, I am working on bringing bit-precise
> integers (_BitInt) to C++. See a very early draft of the paper here:
>
> https://isocpp.org/files/papers/D3666r0.html
>
> The debate over whether _BitInt should be a fundamental type or
> library type has been largely settled, however there are two other
> contentious points:
>
> 1. C does not allow _BitInt(1); should C++ to make generic programming
> more comfortable?
> 2. Should the _BitInt keyword exist in C++? I currently propose to
> have it, mainly because it inevitably will exist as a compiler
> extension or compatibility macro, and it seems pointlessly
> user-hostile not to just standardize existing practice.
>
> If you have some early feedback, especially feedback on these two
> points, that would be appreciated.
>
> You should expect the finished paper to be in the September mailing.
>
>
> Jan
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