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provide a SpecExtend trait for Vec<T>

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The discussion is [here](https://internals.rust-lang.org/t/append-vec-to-binaryheap/15209/3)
This commit is contained in:
Neutron3529 2021-08-24 14:41:28 +08:00
parent b3074819f6
commit 2feee3659e
1 changed files with 8 additions and 0 deletions
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8
library/alloc/src/collections/binary_heap.rs
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@ -1584,6 +1584,14 @@ impl<T: Ord, I: IntoIterator<Item = T>> SpecExtend<I> for BinaryHeap<T> {
} }
} }
impl<T: Ord> SpecExtend<Vec<T>> for BinaryHeap<T> {
fn spec_extend(&mut self, ref mut other: Vec<T>) {
let start = self.data.len();
self.data.append(other);
self.rebuild_tail(start);
}
}
impl<T: Ord> SpecExtend<BinaryHeap<T>> for BinaryHeap<T> { impl<T: Ord> SpecExtend<BinaryHeap<T>> for BinaryHeap<T> {
fn spec_extend(&mut self, ref mut other: BinaryHeap<T>) { fn spec_extend(&mut self, ref mut other: BinaryHeap<T>) {
self.append(other); self.append(other);