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Prefer match over combinators to make some Box methods inlineable #81826

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Merged
merged 1 commit into from
Feb 9, 2021
Merged

Prefer match over combinators to make some Box methods inlineable #81826

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14 changes: 12 additions & 2 deletions library/alloc/src/boxed.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -390,7 +390,12 @@ impl<T, A: Allocator> Box<T, A> {
// #[unstable(feature = "new_uninit", issue = "63291")]
pub fn new_uninit_in(alloc: A) -> Box<mem::MaybeUninit<T>, A> {
let layout = Layout::new::<mem::MaybeUninit<T>>();
Box::try_new_uninit_in(alloc).unwrap_or_else(|_| handle_alloc_error(layout))
// NOTE: Prefer match over unwrap_or_else since closure sometimes not inlineable.
// That would make code size bigger.
match Box::try_new_uninit_in(alloc) {
Ok(m) => m,
Err(_) => handle_alloc_error(layout),
}
}

/// Constructs a new box with uninitialized contents in the provided allocator,
Expand Down Expand Up @@ -447,7 +452,12 @@ impl<T, A: Allocator> Box<T, A> {
// #[unstable(feature = "new_uninit", issue = "63291")]
pub fn new_zeroed_in(alloc: A) -> Box<mem::MaybeUninit<T>, A> {
let layout = Layout::new::<mem::MaybeUninit<T>>();
Box::try_new_zeroed_in(alloc).unwrap_or_else(|_| handle_alloc_error(layout))
// NOTE: Prefer match over unwrap_or_else since closure sometimes not inlineable.
// That would make code size bigger.
match Box::try_new_zeroed_in(alloc) {
Ok(m) => m,
Err(_) => handle_alloc_error(layout),
}
}

/// Constructs a new `Box` with uninitialized contents, with the memory
Expand Down