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Github Avoid unnecessary Vec construction in BufReader by calebsander · Pull Req...
source link: https://github.com/rust-lang/rust/pull/82728
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As mentioned in #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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