[RFC] Deprecate non-standard constructors in std::pair

[Jonathan Wakely]

On 07/04/21 17:59 +0100, Jonathan Wakely wrote:
>On 07/04/21 13:46 +0100, Jonathan Wakely wrote:
>>On 07/04/21 15:41 +0300, Ville Voutilainen via Libstdc++ wrote:
>>>On Wed, 7 Apr 2021 at 15:31, Jonathan Wakely via Libstdc++
>>><libstdc++@gcc.gnu.org> wrote:
>>>>I propose that we deprecate the constructors for C++11/14/17/20 in
>>>>stage 1, and do not support them at all in C++23 mode once P1951 is
>>>>supported. I have a patch which I'll send in stage 1 (it also uses
>>>>C++20 concepts to simplify std::pair and fix PR 97930).
>>>>
>>>>After a period of deprecation we could remove them, and support P1951
>>>>for -std=gnu++11/14/17/20 too so that {} continues to work.
>>>
>>>The proposal sounds good to me.
>>
>>Thanks. I've created https://gcc.gnu.org/PR99957 so I don't forget.
>
>Here's a patch to implement it, for stage 1.

And here's a patch to simplify the std::pair constraints using
concepts, also for consideration in stage 1.


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