Any feedback regarding this proposal:
https://gcc.gnu.org/pipermail/libstdc++/2021-June/052821.html


On 23/06/21 22:34, François Dumont wrote:
> Hi
>
> Following the message to propose an alternative lower_bound and the 
> reply to use three way comparison I try to implement this.
>
> Before going further I wonder if this is something possible ?
>
> The purpose of the:
>
> if constexpr (three_way_comparable<>)
>
> is to make sure that we use it only if there is a proper <=> operator 
> defined. Afai understood what is in <compare> we can have the 
> __synth3way for any type as long as < exist. But I think that if <=> 
> is implemented in terms of < then it might be too expensive, the 
> actual lower_bound might already be implemented this way.
>
> My main concerns is of course Standard conformity, could it be ok ?
>
> François
>