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Document that NotNan is repr(transparent). #158

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merged 2 commits into from
Oct 15, 2024
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@kpreid kpreid commented Oct 15, 2024

Currently, rustdoc only displays repr(transparent) if the type’s fields are public, so there is no indication in the documentation that NotNan has repr(transparent). Even if it was visible, there is not currently a strong consensus that such a repr may be assumed to be a stable part of the public API.

Therefore, I propose to add paragraphs to NotNan and OrderedFloat’s documentation guaranteeing the repr. I also mentioned bytemuck so as to not be encouraging unsafe code, though the phrasing isn’t great.

I’ve also added impl bytemuck::TransparentWrapper for OrderedFloat, which simply gives another way for users to perform conversions, more strongly typed than bytemuck’s casts to/from bytes.

Currently, rustdoc only displays `repr(transparent)` if the type’s
fields are public, so there is no indication in the documentation that
`NotNan` has `repr(transparent)`. Even if it was visible, there is not
currently a strong consensus that such a repr may be assumed to be a
stable part of the public API.

Therefore, add paragraphs to `NotNan` and `OrderedFloat`’s documentation
guaranteeing the repr. I also mentioned `bytemuck` so as to not be
encouraging unsafe code, though the phrasing isn’t great.
This gives a more strongly-typed way for users to take advantage of
`OrderedFloat`’s representation.
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Thanks!

@mbrubeck mbrubeck merged commit e2c7a82 into reem:master Oct 15, 2024
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@kpreid kpreid deleted the transparent branch October 15, 2024 18:43
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2 participants