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Rollup merge of #105128 - Sp00ph:vec_vec_deque_conversion, r=dtolnay

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Add O(1) `Vec -> VecDeque` conversion guarantee

(See #105072)
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Matthias Krüger 2023-01-07 20:43:20 +01:00 committed by GitHub
commit d7519c3639
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1 changed files with 3 additions and 3 deletions
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6
library/alloc/src/collections/vec_deque/mod.rs
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@ -2821,9 +2821,9 @@ impl<T, A: Allocator> From<Vec<T, A>> for VecDeque<T, A> {
/// [`Vec<T>`]: crate::vec::Vec
/// [`VecDeque<T>`]: crate::collections::VecDeque
///
/// In its current implementation, this is a very cheap
/// conversion. This isn't yet a guarantee though, and
/// shouldn't be relied on.
/// This conversion is guaranteed to run in *O*(1) time
/// and to not re-allocate the `Vec`'s buffer or allocate
/// any additional memory.
#[inline]
fn from(other: Vec<T, A>) -> Self {
let (ptr, len, cap, alloc) = other.into_raw_parts_with_alloc();