Avoid unnecessary Vec construction in BufReader #82728
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… r=m-ou-se Avoid unnecessary Vec construction in BufReader As mentioned in rust-lang#80460, creating a `Vec` and calling `Vec::into_boxed_slice()` emits unnecessary calls to `realloc()` and `free()`. Updated the code to use `Box::new_uninit_slice()` to create a boxed slice directly. I think this also makes it more explicit that the initial contents of the buffer are uninitialized. r? `@m-ou-se`
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Rollup of 10 pull requests Successful merges: - rust-lang#80723 (Implement NOOP_METHOD_CALL lint) - rust-lang#80763 (resolve: Reduce scope of `pub_use_of_private_extern_crate` deprecation lint) - rust-lang#81136 (Improved IO Bytes Size Hint) - rust-lang#81939 (Add suggestion `.collect()` for iterators in iterators) - rust-lang#82289 (Fix underflow in specialized ZipImpl::size_hint) - rust-lang#82728 (Avoid unnecessary Vec construction in BufReader) - rust-lang#82764 (Add {BTreeMap,HashMap}::try_insert) - rust-lang#82770 (Add assert_matches macro.) - rust-lang#82773 (Add diagnostic item to `Default` trait) - rust-lang#82787 (Remove unused code from main.js) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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As mentioned in #80460, creating a
Vecand callingVec::into_boxed_slice()emits unnecessary calls torealloc()andfree(). Updated the code to useBox::new_uninit_slice()to create a boxed slice directly. I think this also makes it more explicit that the initial contents of the buffer are uninitialized.r? @m-ou-se