Streamline deriving on packed structs. #104662
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The current approach to field accesses in derived code:
- Normal case: `&self.0`
- In a packed struct that derives `Copy`: `&{self.0}`
- In a packed struct that doesn't derive `Copy`: `let Self(ref x) = *self`
The `let` pattern used in the third case is equivalent to the simpler
field access in the first case. This commit changes the third case to
use a field access.
The commit also combines two boolean arguments (`is_packed` and
`always_copy`) into a single field (`copy_fields`) earlier, to save
passing both around.
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jackh726
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Nov 21, 2022
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LGTM. Not sure if you want to do a perf run before landing, but r=me |
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Thanks for the fast review. I don't think this needs a perf run. |
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@bors r=jackh726 rollup |
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…ked-non-copy, r=jackh726
Streamline deriving on packed structs.
The current approach to field accesses in derived code:
- Normal case: `&self.0`
- In a packed struct that derives `Copy`: `&{self.0}`
- In a packed struct that doesn't derive `Copy`: `let Self(ref x) = *self`
The `let` pattern used in the third case is equivalent to the simpler field access in the first case. This commit changes the third case to use a field access.
The commit also combines two boolean arguments (`is_packed` and `always_copy`) into a single field (`copy_fields`) earlier, to save passing both around.
r? `@jackh726`
This was referenced Nov 21, 2022
bors
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Nov 21, 2022
…iaskrgr Rollup of 9 pull requests Successful merges: - rust-lang#104420 (Fix doc example for `wrapping_abs`) - rust-lang#104499 (rustdoc JSON: Use `Function` everywhere and remove `Method`) - rust-lang#104500 (`rustc_ast`: remove `ref` patterns) - rust-lang#104511 (Mark functions created for `raw-dylib` on x86 with DllImport storage class) - rust-lang#104595 (Add `PolyExistentialPredicate` type alias) - rust-lang#104605 (deduplicate constant evaluation in cranelift backend) - rust-lang#104628 (Revert "Update CI to use Android NDK r25b") - rust-lang#104662 (Streamline deriving on packed structs.) - rust-lang#104667 (Revert formatting changes of a test) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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The current approach to field accesses in derived code:
&self.0Copy:&{self.0}Copy:let Self(ref x) = *selfThe
letpattern used in the third case is equivalent to the simpler field access in the first case. This commit changes the third case to use a field access.The commit also combines two boolean arguments (
is_packedandalways_copy) into a single field (copy_fields) earlier, to save passing both around.r? @jackh726