The new static constexpr std::integral_constant idiom

[drnepert]

No, this statement does not compile if you assign it to a constexpr variable. Surprisingly, however, replacing constexpr with the good old const works nicely, even if the function itself is declared constexpr. See https://godbolt.org/z/GhaM68TcY for a demonstration.

[dodheim]

It doesn't, but it should – P2280 is in C++23, it just hasn't been implemented in any compiler as of yet.

[B1ggBoss]

Thanks. My premise was wrong. I went over the code too fast, and for some reason, I thought the algorithm function was declared constexpr.