refactor: use ptr_from_ref and ptr .cast()
#4240
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mejrs
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Jun 7, 2024
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Thanks, I much prefer this as well.
Also, we can use https://doc.rust-lang.org/std/primitive.pointer.html#method.cast_mut when we bump msrv next time :)
Icxolu
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Yes, as well as |
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…tr_from_ref` added in PR PyO3#4240. Updated `PyRefMut::as_super` to use this method instead of `as *mut _`.
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* Added `PyRef::as_super` and `PyRefMut::as_super` methods, including docstrings and tests. The implementation of these methods also required adding `#[repr(transparent)]` to the `PyRef` and `PyRefMut` structs. * Added newsfragment entry. * Changed the `AsRef<U>`/`AsMut<U>` impls for `PyRef` and `PyRefMut` to use the new `as_super` methods. Added the `PyRefMut::downgrade` associated function for converting `&PyRefMut` to `&PyRef`. Updated tests and docstrings to better demonstrate the new functionality. * Fixed newsfragment filename. * Removed unnecessary re-borrows flagged by clippy. * retrigger checks * Updated `PyRef::as_super`, `PyRefMut::as_super`, and `PyRefMut::downgrade` to use `.cast()` instead of `as _` pointer casts. Fixed typo. * Updated `PyRef::as_super` and `PyRefMut::downgrade` to use `ptr_from_ref` for the initial cast to `*const _` instead of `as _` casts. * Added `pyo3::internal_tricks::ptr_from_mut` function alongside the `ptr_from_ref` added in PR #4240. Updated `PyRefMut::as_super` to use this method instead of `as *mut _`. * Updated the user guide to recommend `as_super` for accessing the base class instead of `as_ref`, and updated the subsequent example/doctest to demonstrate this functionality. * Improved tests for the `as_super` methods. * Updated newsfragment to include additional changes. * Fixed formatting. --------- Co-authored-by: jrudolph <[email protected]>
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Typically these days I like to use
x.cast::<Y>()instead ofx as *const Yto perform pointer casting (and in many contexts it's also convenient to let type inference work on justx.cast(), which reads a lot nicer thanx as *const _). It also avoids const <-> mut casting by accident.I just discovered
ptr::from_refand am now similarly excited to replace&x as *const Xwithptr_from_ref(&x).... so this PR is just a few tidy-ups across the codebase!