ricejasonf
commented
5 years ago It is documented in the manual here: http://boostorg.github.io/hana/index.html#tutorial-algorithms-effects
The issue with documenting it for hana::transform itself is that each data-type can have it's own implementation that behaves differently. I'm guessing the one you are considering is for any hana::Sequence.
Take a look at the algorithms for hana::Monad.
GCC appears to evaluate transform function calls out of order, which I think it's allowed to do because function argument evaluation order is undefined. Hana should explicitly document the lack of ordering guarantees in transform.