On Tue, 25 Nov 2025 at 19:12, Paul Caprioli <paul_at_[hidden]> wrote:

> > https://isocpp.org/files/papers/D3935R0.html
>
> In section 2.1.1 above, there is "we don't consider std::float32_t to be
> C23's _Float32"
> Is this correct?


Yes, otherwise any requirement in C regarding _Float32 would automatically
apply to std::float32_t as well, and that's not the case.

https://eel.is/c++draft/basic.extended.fp#7 recommends _Float32 as an
> additional name for float32_t
>
> It's not the same as float, even if float is IEEE binary32.
>

You're reading too much into it. This paragraph just recommends that the
keyword names "should be chosen to increase compatibility and
interoperability" with _Float32 et al. An implementation could also choose
a different name, and even if it chose _Float32, that doesn't necessarily
mean it's the same type with same semantics as the one in C.