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Apply optimization from #44355 to retain #48065

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Merged
merged 3 commits into from
Feb 15, 2018
Merged

Apply optimization from #44355 to retain #48065

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2a4c018
Apply optimization from #44355 to retain
Xaeroxe Feb 7, 2018
a67749a
Swap `ptr::read` for `ptr::drop_in_place`
Xaeroxe Feb 8, 2018
fbad3b2
Switch to retain calling drain_filter.
Xaeroxe Feb 13, 2018
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17 changes: 1 addition & 16 deletions src/liballoc/vec.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -805,22 +805,7 @@ impl<T> Vec<T> {
pub fn retain<F>(&mut self, mut f: F)
where F: FnMut(&T) -> bool
{
let len = self.len();
let mut del = 0;
{
let v = &mut **self;

for i in 0..len {
if !f(&v[i]) {
del += 1;
} else if del > 0 {
v.swap(i - del, i);
}
}
}
if del > 0 {
self.truncate(len - del);
}
self.drain_filter(|x| !f(x));
}

/// Removes all but the first of consecutive elements in the vector that resolve to the same
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