[cfe-dev] [libcxx-dev] Fwd: Library updates for C++20/C++2a

[Casey Carter via cfe-dev]

On Fri, Nov 30, 2018 at 11:38 AM Marshall Clow via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> On Fri, Nov 30, 2018 at 8:45 AM Boris Vinogradov via libcxx-dev <
> libcxx-dev at lists.llvm.org> wrote:
>
>> I investigate new features of C++20 and not found implementation of
>> three-way comparsion operator support (spaceship operator, <=>) - <compare>
>> header. But my compiller (clang version 7.0.0) work correctly with myself
>> scratch draft version of this header (one compare class and stuff).
>>
>> Can I help community to write cxxlib port of C++20 standard? Or I may be
>> can I help in other directions of development?
>>
>>
> There's a lot of churn in the draft standard at the moment regarding the
> spaceship operator.
> We're deliberately waiting until things settle down before implementing.
>
> from just the last WG21 meeting:
> * P1187 A type trait for std::compare_3way()'s type
> * P1191 Adding operator<=> to types that are not currently comparable
> * P1248 Fixing Relations
>

FWIW: P1248 is about the Relation concept, it doesn't directly relate to
<=>. So there were merely 5 papers proposing <=> changes ;)


> * P0891 Let strong_order Truly Be a Customization Point!
> * P1312 Comparison Concepts
> * P1295 Spaceship library update
>
> -- Marshall
>
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