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Use Vec::extend in SmallVec::extend when applicable

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This commit is contained in:
ljedrz 2018-07-30 14:54:33 +02:00
parent a3f519df09
commit 9169934e27
1 changed files with 12 additions and 4 deletions
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16
src/librustc_data_structures/small_vec.rs
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@ -169,10 +169,18 @@ impl<A: Array> FromIterator<A::Element> for SmallVec<A> {
impl<A: Array> Extend<A::Element> for SmallVec<A> {
fn extend<I: IntoIterator<Item=A::Element>>(&mut self, iter: I) {
let iter = iter.into_iter();
self.reserve(iter.size_hint().0);
for el in iter {
self.push(el);
if self.is_array() {
let iter = iter.into_iter();
self.reserve(iter.size_hint().0);
for el in iter {
self.push(el);
}
} else {
match self.0 {
AccumulateVec::Heap(ref mut vec) => vec.extend(iter),
_ => unreachable!()
}
}
}
}