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Add O(1) Vec -> VecDeque conversion guarantee #105128

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Jan 8, 2023
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Add O(1) Vec -> VecDeque conversion guarantee #105128

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6 changes: 3 additions & 3 deletions library/alloc/src/collections/vec_deque/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2794,9 +2794,9 @@ 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();
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