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Re: [wg14/wg21 liaison] Report from the recent C/C++ liaison meeting (SG22); includes new floating point types(!)

From: Jens Maurer <Jens.Maurer_at_[hidden]>
Date: Wed, 15 Sep 2021 20:26:51 +0200
On 15/09/2021 20.12, Joseph Myers via Liaison wrote:
> On Wed, 15 Sep 2021, Thomas Köppe via Liaison wrote:
>> - Currently, the new types are *exclusively* available in the
>> _Reserved_name spelling (like "_Bool" was in C99), there is no set of
>> "pretty" macros (like "bool" was in <stdbool.h>) -- that means that if C++
>> decides to introduce new pretty names like (std::)float16_t, we have no
>> immediately interoperable name (like "float16_t") that would be valid C,
>> since there is no macro "#define float16_t _Float_16", say.
> Also, note that C *does* have typedef names such as _Float16_t - that's a
> type whose range and precision are used for evaluating operations on type
> _Float16, analogous to float_t and double_t.
> I suggest it would be confusing for float16_t to mean something different
> from _Float16_t, and so float16_t may not be a good name to use to mean
> _Float16 in C++.

Is there an actual document that specifies exactly what
the additional C floating-point support is?

The TS does not seem to be freely available.


Received on 2021-09-15 13:27:03