On Friday, 9 January 2026 09:31:56 Brasilia Standard Time Frederick Virchanza
Gotham via Std-Proposals wrote:
> > And why wouldn't a plain struct of the same size suffice?
>
> Looking at GNU g++, LLVM clang, Intel ICX, Microsoft MSVC:

Ignoring the rest of the reply.

Please reply with quotes from the Standard,not implementations.

> 2) Maybe we should have a type called 'lockfree_pointer_pair' that
> is always lockfree, meaning that it uses CPU instructions to achieve
> lockfreeness. If you run such a binary on a computer which is missing
> the lockfree instruction, you get SIGILL for Illegal Instruction.

Dead on arrival. It's impossible to implement that lock-free in all
architectures, so it'll never be added to the Standard.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Principal Engineer - Intel Data Center - Platform & Sys. Eng.