[PATCH] Define midpoint and lerp functions for C++20 (P0811R3)

[Rainer Orth]

Hi Jonathan,

>>Doh, I looked in <cmath> and saw that we get std::abs(double) from the
>>Solaris headers, and then forgot and used it anyway.
>>
>>I'll replace that right away, thanks.
>
> Should be fixed at r272653.
>
> Tested x86_64-linux, committed to trunk.

it did indeed.

Thanks a lot for the super-quick fix.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University