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make specialization of Vec::extend and VecDeque::extend_front work for vec::IntoIter with any Allocator, not just Global

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This commit is contained in:
Antoni Spaanderman 2026-01-02 16:15:40 +01:00
parent 2848c2ebe9
commit 9a170fedd7
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GPG key ID: AE0B68E552E5DF8C
2 changed files with 10 additions and 8 deletions
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14
library/alloc/src/collections/vec_deque/spec_extend.rs
View file

@ -77,8 +77,8 @@ where
}
#[cfg(not(test))]
impl<T, A: Allocator> SpecExtend<T, vec::IntoIter<T>> for VecDeque<T, A> {
fn spec_extend(&mut self, mut iterator: vec::IntoIter<T>) {
impl<T, A1: Allocator, A2: Allocator> SpecExtend<T, vec::IntoIter<T, A2>> for VecDeque<T, A1> {
fn spec_extend(&mut self, mut iterator: vec::IntoIter<T, A2>) {
let slice = iterator.as_slice();
self.reserve(slice.len());
@ -153,9 +153,9 @@ where
}
#[cfg(not(test))]
impl<T, A: Allocator> SpecExtendFront<T, vec::IntoIter<T>> for VecDeque<T, A> {
impl<T, A1: Allocator, A2: Allocator> SpecExtendFront<T, vec::IntoIter<T, A2>> for VecDeque<T, A1> {
#[track_caller]
fn spec_extend_front(&mut self, mut iterator: vec::IntoIter<T>) {
fn spec_extend_front(&mut self, mut iterator: vec::IntoIter<T, A2>) {
let slice = iterator.as_slice();
// SAFETY: elements in the slice are forgotten after this call
unsafe { prepend_reversed(self, slice) };
@ -164,9 +164,11 @@ impl<T, A: Allocator> SpecExtendFront<T, vec::IntoIter<T>> for VecDeque<T, A> {
}
#[cfg(not(test))]
impl<T, A: Allocator> SpecExtendFront<T, Rev<vec::IntoIter<T>>> for VecDeque<T, A> {
impl<T, A1: Allocator, A2: Allocator> SpecExtendFront<T, Rev<vec::IntoIter<T, A2>>>
for VecDeque<T, A1>
{
#[track_caller]
fn spec_extend_front(&mut self, iterator: Rev<vec::IntoIter<T>>) {
fn spec_extend_front(&mut self, iterator: Rev<vec::IntoIter<T, A2>>) {
let mut iterator = iterator.into_inner();
let slice = iterator.as_slice();
// SAFETY: elements in the slice are forgotten after this call

4
library/alloc/src/vec/spec_extend.rs
View file

@ -28,8 +28,8 @@ where
}
}
impl<T, A: Allocator> SpecExtend<T, IntoIter<T>> for Vec<T, A> {
fn spec_extend(&mut self, mut iterator: IntoIter<T>) {
impl<T, A1: Allocator, A2: Allocator> SpecExtend<T, IntoIter<T, A2>> for Vec<T, A1> {
fn spec_extend(&mut self, mut iterator: IntoIter<T, A2>) {
unsafe {
self.append_elements(iterator.as_slice() as _);
}