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Please document hana::transform side effect ordering #448

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dcolascione opened this issue May 22, 2019 · 1 comment
Open

Please document hana::transform side effect ordering #448

dcolascione opened this issue May 22, 2019 · 1 comment

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@dcolascione
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@dcolascione dcolascione commented May 22, 2019

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.
@ricejasonf
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@ricejasonf ricejasonf commented May 22, 2019 •
edited

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.
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@dcolascione @ricejasonf
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