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replace unsafe ptr::write with deref-write, benchmarks show no difference

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This commit is contained in:
The8472 2020-01-25 15:01:39 +01:00
parent 9596e5a2f2
commit 0d2d033415
1 changed files with 4 additions and 10 deletions
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14
library/alloc/src/vec.rs
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@ -2086,11 +2086,8 @@ impl<T> Extend<T> for Vec<T> {
<Self as SpecExtend<T, I::IntoIter>>::spec_extend(self, iter.into_iter())
} else {
// if self has no allocation then use the more powerful from_iter specializations
let other = SpecFrom::from_iter(iter.into_iter());
// replace self, don't run drop since self was empty
unsafe {
ptr::write(self, other);
}
// and overwrite self
*self = SpecFrom::from_iter(iter.into_iter());
}
}
@ -2544,11 +2541,8 @@ impl<'a, T: 'a + Copy> Extend<&'a T> for Vec<T> {
self.spec_extend(iter.into_iter())
} else {
// if self has no allocation then use the more powerful from_iter specializations
let other = SpecFrom::from_iter(iter.into_iter());
// replace self, don't run drop since self was empty
unsafe {
ptr::write(self, other);
}
// and overwrite self
*self = SpecFrom::from_iter(iter.into_iter());
}
}