ndk: Implement common traits where sensible, and drop some Ord
#483
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daxpedda
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Aug 14, 2024
Provided traits in the `ndk` crate are all over the place. Some pointer wrappers and regular enumerations derive `(Partial)Ord` even though there is no sense in using an ordering for these types. Others don't derive `(Partial)Eq` and `Hash` which makes it hard to compare if objects are the same (by-pointer) or to store them inside i.e. `HashMap`. Deriving these types follows Rust's [C-COMMON-TRAITS] convention. Additionally, sort `derives` by their relation, followed by sorting them alphabetically. [C-COMMON-TRAITS]: https://rust-lang.github.io/api-guidelines/interoperability.html#types-eagerly-implement-common-traits-c-common-traits
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MarijnS95
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| #[derive(Debug, PartialEq, Eq, Hash)] | ||
| #[doc(alias = "AAssetManager")] | ||
| pub struct AssetManager { |
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Can be Clone/Copy since this is a cheap reference/handle from Activity (but should carry a lifetime on Activity realistically).
EDIT: Turns out I already started looking into this at https://github.com/rust-mobile/ndk/compare/asset-lifetime
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Provided traits in the
ndkcrate are all over the place. Some pointer wrappers and regular enumerations derive(Partial)Ordeven though there is no sense in using an ordering for these types. Others don't derive(Partial)EqandHashwhich makes it hard to compare if objects are the same (by-pointer) or to store them inside i.e.HashMap. Deriving these types follows Rust's C-COMMON-TRAITS convention.Additionally, sort
derivesby their relation, followed by sorting them alphabetically.Note that
Hashmay not be all too useful to store owned types as keys inHashMap, in case you have to temporarily increase the refcount on a pointer (i.e. aNativeWindowinside a callback viaNativeWindow::clone_from_ptr()) just to extract the element with that pointer, but that is hopefully something we can revise with #309. Additionally, some ways of solving that issue may involve addingClone, Copyto some non-refcounted types (assuming they have an external lifetime guarding it).TODO
ndk-systo be able to implement them on structures that ownffistructures;Iterwrappers?Ordon pointer wrappers after all, to store them in i.e.BTreeMapeven though their ordering has no useful definition?CC @daxpedda for suggestions based on rust-windowing/winit#3796 :)